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Waka Iti.
MARWYN AND JOHN'S HOME PAGES John's amateur radio pages. After quite a lot of years of being off the air (2 November 1993 to 2 September 2007, according to the logbook!), I decided it was time to get going with amateur radio again. I was licensed in 1978 as GM8OTI, have always been interested in 'homebrew' equipment (I'm a physicist, after all!) and at last amback on air
MARWYN AND JOHN'S HOME PAGES Battery boxes are at the bottom (also DC in connectors for the external PSU), with 4 crystals installed for S20, S21, S22 and R6. I eventually replaced R6 with S23. In the view below, the receiver board is on the left, and the transmitter board centre, just to the left of the battery box. Other boards include mic amplifier and AF amplifier. MARWYN AND JOHN'S HOME PAGES John's homebrew page. My interest in electronics goes a long way back - I think the Ladybird book "Magnets, Bulbs and Batteries" was one of my earliest tutors; that had me hunting for double cotton covered wire at the time when it was becoming difficult to get.I remember making a working electric motor from a cork, a darning needle, two short pins, four long needles, two drawing pins, a magnet MARWYN AND JOHN'S HOME PAGESSEE MORE ON MARWYNANDJOHN.ORG.UK MARWYN AND JOHN'S HOME PAGES John's homebrew pages Getting started at 3cm (10GHz) My original plan was to work my way up the bands. Having built successful transverters for 1.3GHz and 2.3GHz, the next step should be to move to 3.4GHz.. However, that's not a big jump in frequency, and I think I have most of the bits to build a 3.4GHz transverter, which will be very similarto the 2.3GHz one.
MARWYN AND JOHN'S HOME PAGES John's homebrew pages Simple band-pass filter for 23cm. The improved 23cm transverter had been tested in action but I wanted to add one final improvement - a bandpass filter.. There were two reasons for this. First, it is a Good Thing in that it significantly reduces the radiation of out-of-band signals if any are produced by thetransverter.
MARWYN AND JOHN'S HOME PAGES A 13cm (2.3GHz) transverter with 432MHz IF. I decided to try to move up the microwave bands one by one - so 13cm comes after 23cm. Whether or not I'll be able to resist jumping straight to 3cm at some stage we'll have to see. After using multiplier designs for the local oscillators of my 23cm transverters, I decided to try aPLL-synthesiser
MARWYN AND JOHN'S HOME PAGES The design values for the inductors were 59.649nH and 102.724nH, and for the capacitors 28.527pF. The practical design looks like this, with the series/parallel capacitors giving me 28.5pF: The inductors were constructed as follows and can be seen in the photo above: MARWYN AND JOHN'S HOME PAGES A directional coupler allows a small amound of the forward signal to be sampled and measured. A very simple design is to use microstrip, as shown in the photo. A BAT85 Schottky diode is used as the detector, with 100pF and 10nF decoupling. The other end of the coupling loop is terminated with two 100 ohm resistors in parallel. MARWYN AND JOHN'S HOME PAGES Boatbuilding at home. I've also built a few boats and intend to build another one yet. My first was Mildred , an 8 foot (2.5m) pram dinghy; she's still in good condition and I hope to sail her again before long. On the boatbuilding at home pages you can see some details of this build, Aoraki, and another Wharram design, my outrigger canoeWaka Iti.
MARWYN AND JOHN'S HOME PAGES John's amateur radio pages. After quite a lot of years of being off the air (2 November 1993 to 2 September 2007, according to the logbook!), I decided it was time to get going with amateur radio again. I was licensed in 1978 as GM8OTI, have always been interested in 'homebrew' equipment (I'm a physicist, after all!) and at last amback on air
MARWYN AND JOHN'S HOME PAGES Battery boxes are at the bottom (also DC in connectors for the external PSU), with 4 crystals installed for S20, S21, S22 and R6. I eventually replaced R6 with S23. In the view below, the receiver board is on the left, and the transmitter board centre, just to the left of the battery box. Other boards include mic amplifier and AF amplifier. MARWYN AND JOHN'S HOME PAGES John's homebrew page. My interest in electronics goes a long way back - I think the Ladybird book "Magnets, Bulbs and Batteries" was one of my earliest tutors; that had me hunting for double cotton covered wire at the time when it was becoming difficult to get.I remember making a working electric motor from a cork, a darning needle, two short pins, four long needles, two drawing pins, a magnet MARWYN AND JOHN'S HOME PAGESSEE MORE ON MARWYNANDJOHN.ORG.UK MARWYN AND JOHN'S HOME PAGES John's homebrew pages Getting started at 3cm (10GHz) My original plan was to work my way up the bands. Having built successful transverters for 1.3GHz and 2.3GHz, the next step should be to move to 3.4GHz.. However, that's not a big jump in frequency, and I think I have most of the bits to build a 3.4GHz transverter, which will be very similarto the 2.3GHz one.
MARWYN AND JOHN'S HOME PAGES John's homebrew pages Simple band-pass filter for 23cm. The improved 23cm transverter had been tested in action but I wanted to add one final improvement - a bandpass filter.. There were two reasons for this. First, it is a Good Thing in that it significantly reduces the radiation of out-of-band signals if any are produced by thetransverter.
MARWYN AND JOHN'S HOME PAGES A 13cm (2.3GHz) transverter with 432MHz IF. I decided to try to move up the microwave bands one by one - so 13cm comes after 23cm. Whether or not I'll be able to resist jumping straight to 3cm at some stage we'll have to see. After using multiplier designs for the local oscillators of my 23cm transverters, I decided to try aPLL-synthesiser
MARWYN AND JOHN'S HOME PAGES The design values for the inductors were 59.649nH and 102.724nH, and for the capacitors 28.527pF. The practical design looks like this, with the series/parallel capacitors giving me 28.5pF: The inductors were constructed as follows and can be seen in the photo above: MARWYN AND JOHN'S HOME PAGES A directional coupler allows a small amound of the forward signal to be sampled and measured. A very simple design is to use microstrip, as shown in the photo. A BAT85 Schottky diode is used as the detector, with 100pF and 10nF decoupling. The other end of the coupling loop is terminated with two 100 ohm resistors in parallel. MARWYN AND JOHN'S HOME PAGES where you will find details of some of the things that we made available to friends and family. MARWYN AND JOHN'S HOME PAGES Polynesian catamaran pages. Yes, such an organisation as the Polynesian Catamaran Association used to exist, and might still! I'm a fan of Polynesian catamarans, as interpreted by James Wharram, and there's more about these on my polynesian catamaran pages. Sunshine was actually a Wharram design (though with modified cabin tops) Tiki 21; my previous boat, Aoraki, was also a polynesian MARWYN AND JOHN'S HOME PAGES John's amateur radio pages. After quite a lot of years of being off the air (2 November 1993 to 2 September 2007, according to the logbook!), I decided it was time to get going with amateur radio again. I was licensed in 1978 as GM8OTI, have always been interested in 'homebrew' equipment (I'm a physicist, after all!) and at last amback on air
MARWYN AND JOHN'S HOME PAGES Construction. For the first time in about 25 years I decided to make a pcb - I need to get back into that for future microwave projects (I know, you can get them made via online companies, I'll probably use theose for more complex jobs, but when it's simple anyway I like playing with chemicals, even though I'm a MARWYN AND JOHN'S HOME PAGES A 100 microamp meter is used as the detector (100-0-100 microamps here since that's what I had available). I set it up so the meter needle goes in the direction the switch is set to - forward or reverse. The rotary switch is for the range setting, which has a resistor in series with the meter for each range apart from the most sensitive; they MARWYN AND JOHN'S HOME PAGES The original design is on the web pages of OZ1PIF; it was apparently later published in DUBUS magazine in 2005. That design uses 2 modules, each with 8 IRF510 devices, and a 40V power supply; each module provides 250W of RF from 10W input. I can't carry (cheap enough) batteries that will provide that power up hills, so mine is a reducedversion
MARWYN AND JOHN'S HOME PAGES John's homebrew pages Making "optical" printed circuit boards. For a long time I had intended to make printed circuit boards "optically", that is from a printed mask rather than a mask painted on to the copper (the earliest technique I used) or drawn on with a permanentmarker pen (a
MARWYN AND JOHN'S HOME PAGES The folded dipole tok a few tweaks to get right, using a broom handle and file handle as the hard round surfaces to bend the copper on. It's mounted on a piece of prespex, to which the BNC connector is also fastened; the dipole is simply well soldered to the connector pin. This close-up shows the balun which matches the coax to the foldeddipole.
MARWYN AND JOHN'S HOME PAGES John's homebrew pages 2m diameter portable dish antenna I had seen a great design for a dish antenna with stressed struts to form the surface in the International Microwave Handbook (2nd edition, 2008). However it was very well engineered in metal, and I don't have the facilities to do that. MARWYN AND JOHN'S HOME PAGES 2m Lambda Loop Antenna. My location in the city is not a good one. First, it's not on the top of a hill - it's halfway down a north facing slope. Secondly, it's a flat in a fairly dense residential area, and consequently the level of electrical noise is severe - that's why most of my operating is /P - MARWYN AND JOHN'S HOME PAGES where you will find details of some of the things that we made available to friends and family. MARWYN AND JOHN'S HOME PAGES Battery boxes are at the bottom (also DC in connectors for the external PSU), with 4 crystals installed for S20, S21, S22 and R6. I eventually replaced R6 with S23. In the view below, the receiver board is on the left, and the transmitter board centre, just to the left of the battery box. Other boards include mic amplifier and AF amplifier. MARWYN AND JOHN'S HOME PAGES John's homebrew page. My interest in electronics goes a long way back - I think the Ladybird book "Magnets, Bulbs and Batteries" was one of my earliest tutors; that had me hunting for double cotton covered wire at the time when it was becoming difficult to get.I remember making a working electric motor from a cork, a darning needle, two short pins, four long needles, two drawing pins, a magnet MARWYN AND JOHN'S HOME PAGESSEE MORE ON MARWYNANDJOHN.ORG.UK MARWYN AND JOHN'S HOME PAGES John's homebrew pages Simple band-pass filter for 23cm. The improved 23cm transverter had been tested in action but I wanted to add one final improvement - a bandpass filter.. There were two reasons for this. First, it is a Good Thing in that it significantly reduces the radiation of out-of-band signals if any are produced by thetransverter.
MARWYN AND JOHN'S HOME PAGES A 13cm (2.3GHz) transverter with 432MHz IF. I decided to try to move up the microwave bands one by one - so 13cm comes after 23cm. Whether or not I'll be able to resist jumping straight to 3cm at some stage we'll have to see. After using multiplier designs for the local oscillators of my 23cm transverters, I decided to try aPLL-synthesiser
MARWYN AND JOHN'S HOME PAGES John's homebrew pages Getting started at 3cm (10GHz) My original plan was to work my way up the bands. Having built successful transverters for 1.3GHz and 2.3GHz, the next step should be to move to 3.4GHz.. However, that's not a big jump in frequency, and I think I have most of the bits to build a 3.4GHz transverter, which will be very similarto the 2.3GHz one.
MARWYN AND JOHN'S HOME PAGES The design values for the inductors were 59.649nH and 102.724nH, and for the capacitors 28.527pF. The practical design looks like this, with the series/parallel capacitors giving me 28.5pF: The inductors were constructed as follows and can be seen in the photo above: MARWYN AND JOHN'S HOME PAGES John's homebrew pages 2m diameter portable dish antenna I had seen a great design for a dish antenna with stressed struts to form the surface in the International Microwave Handbook (2nd edition, 2008). However it was very well engineered in metal, and I don't have the facilities to do that. MARWYN AND JOHN'S HOME PAGES John's homebrew pages Portable 12 element 70cm yagi antenna. Following on from the 2m 7 ele Yagi, I want to start moving up in frequency. The FT-817 is a bit short of power but maybe a decent portable antennawill help!
MARWYN AND JOHN'S HOME PAGES where you will find details of some of the things that we made available to friends and family. MARWYN AND JOHN'S HOME PAGES Battery boxes are at the bottom (also DC in connectors for the external PSU), with 4 crystals installed for S20, S21, S22 and R6. I eventually replaced R6 with S23. In the view below, the receiver board is on the left, and the transmitter board centre, just to the left of the battery box. Other boards include mic amplifier and AF amplifier. MARWYN AND JOHN'S HOME PAGES John's homebrew page. My interest in electronics goes a long way back - I think the Ladybird book "Magnets, Bulbs and Batteries" was one of my earliest tutors; that had me hunting for double cotton covered wire at the time when it was becoming difficult to get.I remember making a working electric motor from a cork, a darning needle, two short pins, four long needles, two drawing pins, a magnet MARWYN AND JOHN'S HOME PAGESSEE MORE ON MARWYNANDJOHN.ORG.UK MARWYN AND JOHN'S HOME PAGES John's homebrew pages Simple band-pass filter for 23cm. The improved 23cm transverter had been tested in action but I wanted to add one final improvement - a bandpass filter.. There were two reasons for this. First, it is a Good Thing in that it significantly reduces the radiation of out-of-band signals if any are produced by thetransverter.
MARWYN AND JOHN'S HOME PAGES A 13cm (2.3GHz) transverter with 432MHz IF. I decided to try to move up the microwave bands one by one - so 13cm comes after 23cm. Whether or not I'll be able to resist jumping straight to 3cm at some stage we'll have to see. After using multiplier designs for the local oscillators of my 23cm transverters, I decided to try aPLL-synthesiser
MARWYN AND JOHN'S HOME PAGES John's homebrew pages Getting started at 3cm (10GHz) My original plan was to work my way up the bands. Having built successful transverters for 1.3GHz and 2.3GHz, the next step should be to move to 3.4GHz.. However, that's not a big jump in frequency, and I think I have most of the bits to build a 3.4GHz transverter, which will be very similarto the 2.3GHz one.
MARWYN AND JOHN'S HOME PAGES The design values for the inductors were 59.649nH and 102.724nH, and for the capacitors 28.527pF. The practical design looks like this, with the series/parallel capacitors giving me 28.5pF: The inductors were constructed as follows and can be seen in the photo above: MARWYN AND JOHN'S HOME PAGES John's homebrew pages 2m diameter portable dish antenna I had seen a great design for a dish antenna with stressed struts to form the surface in the International Microwave Handbook (2nd edition, 2008). However it was very well engineered in metal, and I don't have the facilities to do that. MARWYN AND JOHN'S HOME PAGES John's homebrew pages Portable 12 element 70cm yagi antenna. Following on from the 2m 7 ele Yagi, I want to start moving up in frequency. The FT-817 is a bit short of power but maybe a decent portable antennawill help!
MARWYN AND JOHN'S HOME PAGES Polynesian catamaran pages. Yes, such an organisation as the Polynesian Catamaran Association used to exist, and might still! I'm a fan of Polynesian catamarans, as interpreted by James Wharram, and there's more about these on my polynesian catamaran pages. Sunshine was actually a Wharram design (though with modified cabin tops) Tiki 21; my previous boat, Aoraki, was also a polynesian MARWYN AND JOHN'S HOME PAGES John's amateur radio pages. After quite a lot of years of being off the air (2 November 1993 to 2 September 2007, according to the logbook!), I decided it was time to get going with amateur radio again. I was licensed in 1978 as GM8OTI, have always been interested in 'homebrew' equipment (I'm a physicist, after all!) and at last amback on air
MARWYN AND JOHN'S HOME PAGES Sweden , July 2002. Our summer holiday was in mainland Scandinavia for the first time (we went to the Faeroe Islands a long time ago). We travelled by ferry from Newcastle to Gothenurg, and took Waka Iti on the top of the car with us. The scenery was superb, and John at last visited the Kon Tiki museum and the Viking Ship museum on a day trip MARWYN AND JOHN'S HOME PAGES 23cm DL6WU home brew 15 element beam. To test the 23cm transverter properly needed a real antenna. I decided to try a design by DL6WU, and this is written up fully with a link to the design software. My version uses 21.5mm plastic plumbing pipe for the boom and aluminium rod for the directors and reflector. The folded dipole feed is madefrom
MARWYN AND JOHN'S HOME PAGES A 100 microamp meter is used as the detector (100-0-100 microamps here since that's what I had available). I set it up so the meter needle goes in the direction the switch is set to - forward or reverse. The rotary switch is for the range setting, which has a resistor in series with the meter for each range apart from the most sensitive; they MARWYN AND JOHN'S HOME PAGES John's homebrew pages Portable 12 element 70cm yagi antenna. Following on from the 2m 7 ele Yagi, I want to start moving up in frequency. The FT-817 is a bit short of power but maybe a decent portable antennawill help!
MARWYN AND JOHN'S HOME PAGES John's homebrew pages Microwave directional coupler - and an RF detector. More deviations from the main project. I was concerned that, as I manage to generate a bit more power (hopefully!) at microwave frequencies, a simple RF probe would not be sufficient for powermeasurement, and
MARWYN AND JOHN'S HOME PAGES The folded dipole tok a few tweaks to get right, using a broom handle and file handle as the hard round surfaces to bend the copper on. It's mounted on a piece of prespex, to which the BNC connector is also fastened; the dipole is simply well soldered to the connector pin. This close-up shows the balun which matches the coax to the foldeddipole.
MARWYN AND JOHN'S HOME PAGES John's homebrew pages A single board 23cm (1.3GHz) transverter with 144MHz IF . As I have gradually built up a bit of experience in the microwave bands, I have been thinking about a nice project which could help a lot of other people to get going quite easily, fairly quickly, and most importanly (for me!) cheaply. MARWYN AND JOHN'S HOME PAGES 2m Lambda Loop Antenna. My location in the city is not a good one. First, it's not on the top of a hill - it's halfway down a north facing slope. Secondly, it's a flat in a fairly dense residential area, and consequently the level of electrical noise is severe - that's why most of my operating is /P - MARWYN AND JOHN'S HOME PAGES where you will find details of some of the things that we made available to friends and family. MARWYN AND JOHN'S HOME PAGES John's amateur radio pages. After quite a lot of years of being off the air (2 November 1993 to 2 September 2007, according to the logbook!), I decided it was time to get going with amateur radio again. I was licensed in 1978 as GM8OTI, have always been interested in 'homebrew' equipment (I'm a physicist, after all!) and at last amback on air
MARWYN AND JOHN'S HOME PAGESSEE MORE ON MARWYNANDJOHN.ORG.UK MARWYN AND JOHN'S HOME PAGES John's homebrew page. My interest in electronics goes a long way back - I think the Ladybird book "Magnets, Bulbs and Batteries" was one of my earliest tutors; that had me hunting for double cotton covered wire at the time when it was becoming difficult to get.I remember making a working electric motor from a cork, a darning needle, two short pins, four long needles, two drawing pins, a magnet MARWYN AND JOHN'S HOME PAGES Battery boxes are at the bottom (also DC in connectors for the external PSU), with 4 crystals installed for S20, S21, S22 and R6. I eventually replaced R6 with S23. In the view below, the receiver board is on the left, and the transmitter board centre, just to the left of the battery box. Other boards include mic amplifier and AF amplifier. MARWYN AND JOHN'S HOME PAGESSEE MORE ON MARWYNANDJOHN.ORG.UK MARWYN AND JOHN'S HOME PAGES John's homebrew pages Simple band-pass filter for 23cm. The improved 23cm transverter had been tested in action but I wanted to add one final improvement - a bandpass filter.. There were two reasons for this. First, it is a Good Thing in that it significantly reduces the radiation of out-of-band signals if any are produced by thetransverter.
MARWYN AND JOHN'S HOME PAGES A 13cm (2.3GHz) transverter with 432MHz IF. I decided to try to move up the microwave bands one by one - so 13cm comes after 23cm. Whether or not I'll be able to resist jumping straight to 3cm at some stage we'll have to see. After using multiplier designs for the local oscillators of my 23cm transverters, I decided to try aPLL-synthesiser
MARWYN AND JOHN'S HOME PAGES By 1861 Henry was married, to Barbara (Morrison), and they had their first son John aged one. They still lived in Evrabister, and Henry was a "farmer of 8 Acres and fisherman". Between 1861 and 1871 came the eviction of the Hunters from Evrabister, which seems to have followed other evictions from Northhouse and Evrabister around the time of MARWYN AND JOHN'S HOME PAGES A 100 microamp meter is used as the detector (100-0-100 microamps here since that's what I had available). I set it up so the meter needle goes in the direction the switch is set to - forward or reverse. The rotary switch is for the range setting, which has a resistor in series with the meter for each range apart from the most sensitive; they MARWYN AND JOHN'S HOME PAGES where you will find details of some of the things that we made available to friends and family. MARWYN AND JOHN'S HOME PAGES John's amateur radio pages. After quite a lot of years of being off the air (2 November 1993 to 2 September 2007, according to the logbook!), I decided it was time to get going with amateur radio again. I was licensed in 1978 as GM8OTI, have always been interested in 'homebrew' equipment (I'm a physicist, after all!) and at last amback on air
MARWYN AND JOHN'S HOME PAGESSEE MORE ON MARWYNANDJOHN.ORG.UK MARWYN AND JOHN'S HOME PAGES John's homebrew page. My interest in electronics goes a long way back - I think the Ladybird book "Magnets, Bulbs and Batteries" was one of my earliest tutors; that had me hunting for double cotton covered wire at the time when it was becoming difficult to get.I remember making a working electric motor from a cork, a darning needle, two short pins, four long needles, two drawing pins, a magnet MARWYN AND JOHN'S HOME PAGES Battery boxes are at the bottom (also DC in connectors for the external PSU), with 4 crystals installed for S20, S21, S22 and R6. I eventually replaced R6 with S23. In the view below, the receiver board is on the left, and the transmitter board centre, just to the left of the battery box. Other boards include mic amplifier and AF amplifier. MARWYN AND JOHN'S HOME PAGESSEE MORE ON MARWYNANDJOHN.ORG.UK MARWYN AND JOHN'S HOME PAGES John's homebrew pages Simple band-pass filter for 23cm. The improved 23cm transverter had been tested in action but I wanted to add one final improvement - a bandpass filter.. There were two reasons for this. First, it is a Good Thing in that it significantly reduces the radiation of out-of-band signals if any are produced by thetransverter.
MARWYN AND JOHN'S HOME PAGES A 13cm (2.3GHz) transverter with 432MHz IF. I decided to try to move up the microwave bands one by one - so 13cm comes after 23cm. Whether or not I'll be able to resist jumping straight to 3cm at some stage we'll have to see. After using multiplier designs for the local oscillators of my 23cm transverters, I decided to try aPLL-synthesiser
MARWYN AND JOHN'S HOME PAGES By 1861 Henry was married, to Barbara (Morrison), and they had their first son John aged one. They still lived in Evrabister, and Henry was a "farmer of 8 Acres and fisherman". Between 1861 and 1871 came the eviction of the Hunters from Evrabister, which seems to have followed other evictions from Northhouse and Evrabister around the time of MARWYN AND JOHN'S HOME PAGES A 100 microamp meter is used as the detector (100-0-100 microamps here since that's what I had available). I set it up so the meter needle goes in the direction the switch is set to - forward or reverse. The rotary switch is for the range setting, which has a resistor in series with the meter for each range apart from the most sensitive; they MARWYN AND JOHN'S HOME PAGES Astronomy. John has spent much of his life as a professional astronomer, working in the Institute for Astronomy (ifA) at the Royal Observatory, Edinburgh.The IfA is part of the School of Physics in the University of Edinburgh, where John also worked for a year as School Administrator after a period as Associate Dean in the College of Science and Engineering. MARWYN AND JOHN'S HOME PAGES John's amateur radio pages. After quite a lot of years of being off the air (2 November 1993 to 2 September 2007, according to the logbook!), I decided it was time to get going with amateur radio again. I was licensed in 1978 as GM8OTI, have always been interested in 'homebrew' equipment (I'm a physicist, after all!) and at last amback on air
MARWYN AND JOHN'S HOME PAGES Family history. Originally we put this material online for family use; we had done some research in 1985 in the Shetland Archive, and written it up (in longhand!) and sent photocopies around the family. MARWYN AND JOHN'S HOME PAGES Boatbuilding at home. I've also built a few boats and intend to build another one yet. My first was Mildred , an 8 foot (2.5m) pram dinghy; she's still in good condition and I hope to sail her again before long. On the boatbuilding at home pages you can see some details of this build, Aoraki, and another Wharram design, my outrigger canoeWaka Iti.
MARWYN AND JOHN'S HOME PAGES 23cm DL6WU home brew 15 element beam. To test the 23cm transverter properly needed a real antenna. I decided to try a design by DL6WU, and this is written up fully with a link to the design software. My version uses 21.5mm plastic plumbing pipe for the boom and aluminium rod for the directors and reflector. The folded dipole feed is madefrom
MARWYN AND JOHN'S HOME PAGES John's homebrew pages Getting started at 3cm (10GHz) My original plan was to work my way up the bands. Having built successful transverters for 1.3GHz and 2.3GHz, the next step should be to move to 3.4GHz.. However, that's not a big jump in frequency, and I think I have most of the bits to build a 3.4GHz transverter, which will be very similarto the 2.3GHz one.
MARWYN AND JOHN'S HOME PAGES John's homebrew pages 2m diameter portable dish antenna I had seen a great design for a dish antenna with stressed struts to form the surface in the International Microwave Handbook (2nd edition, 2008). However it was very well engineered in metal, and I don't have the facilities to do that. MARWYN AND JOHN'S HOME PAGES The folded dipole tok a few tweaks to get right, using a broom handle and file handle as the hard round surfaces to bend the copper on. It's mounted on a piece of prespex, to which the BNC connector is also fastened; the dipole is simply well soldered to the connector pin. This close-up shows the balun which matches the coax to the foldeddipole.
MARWYN AND JOHN'S HOME PAGES John's homebrew pages Portable 12 element 70cm yagi antenna. Following on from the 2m 7 ele Yagi, I want to start moving up in frequency. The FT-817 is a bit short of power but maybe a decent portable antennawill help!
MARWYN AND JOHN'S HOME PAGES 2m Lambda Loop Antenna. My location in the city is not a good one. First, it's not on the top of a hill - it's halfway down a north facing slope. Secondly, it's a flat in a fairly dense residential area, and consequently the level of electrical noise is severe - that's why most of my operating is /P - MARWYN AND JOHN'S HOME PAGES where you will find details of some of the things that we made available to friends and family. MARWYN AND JOHN'S HOME PAGES John's amateur radio pages. After quite a lot of years of being off the air (2 November 1993 to 2 September 2007, according to the logbook!), I decided it was time to get going with amateur radio again. I was licensed in 1978 as GM8OTI, have always been interested in 'homebrew' equipment (I'm a physicist, after all!) and at last amback on air
MARWYN AND JOHN'S HOME PAGES Battery boxes are at the bottom (also DC in connectors for the external PSU), with 4 crystals installed for S20, S21, S22 and R6. I eventually replaced R6 with S23. In the view below, the receiver board is on the left, and the transmitter board centre, just to the left of the battery box. Other boards include mic amplifier and AF amplifier. MARWYN AND JOHN'S HOME PAGES John's homebrew page. My interest in electronics goes a long way back - I think the Ladybird book "Magnets, Bulbs and Batteries" was one of my earliest tutors; that had me hunting for double cotton covered wire at the time when it was becoming difficult to get.I remember making a working electric motor from a cork, a darning needle, two short pins, four long needles, two drawing pins, a magnet MARWYN AND JOHN'S HOME PAGESSEE MORE ON MARWYNANDJOHN.ORG.UK MARWYN AND JOHN'S HOME PAGESSEE MORE ON MARWYNANDJOHN.ORG.UK MARWYN AND JOHN'S HOME PAGES John's homebrew pages Simple band-pass filter for 23cm. The improved 23cm transverter had been tested in action but I wanted to add one final improvement - a bandpass filter.. There were two reasons for this. First, it is a Good Thing in that it significantly reduces the radiation of out-of-band signals if any are produced by thetransverter.
MARWYN AND JOHN'S HOME PAGES John's homebrew pages 2m diameter portable dish antenna I had seen a great design for a dish antenna with stressed struts to form the surface in the International Microwave Handbook (2nd edition, 2008). However it was very well engineered in metal, and I don't have the facilities to do that. MARWYN AND JOHN'S HOME PAGES John's homebrew pages Portable 12 element 70cm yagi antenna. Following on from the 2m 7 ele Yagi, I want to start moving up in frequency. The FT-817 is a bit short of power but maybe a decent portable antennawill help!
MARWYN AND JOHN'S HOME PAGES 2m Lambda Loop Antenna. My location in the city is not a good one. First, it's not on the top of a hill - it's halfway down a north facing slope. Secondly, it's a flat in a fairly dense residential area, and consequently the level of electrical noise is severe - that's why most of my operating is /P - MARWYN AND JOHN'S HOME PAGES where you will find details of some of the things that we made available to friends and family. MARWYN AND JOHN'S HOME PAGES John's amateur radio pages. After quite a lot of years of being off the air (2 November 1993 to 2 September 2007, according to the logbook!), I decided it was time to get going with amateur radio again. I was licensed in 1978 as GM8OTI, have always been interested in 'homebrew' equipment (I'm a physicist, after all!) and at last amback on air
MARWYN AND JOHN'S HOME PAGES Battery boxes are at the bottom (also DC in connectors for the external PSU), with 4 crystals installed for S20, S21, S22 and R6. I eventually replaced R6 with S23. In the view below, the receiver board is on the left, and the transmitter board centre, just to the left of the battery box. Other boards include mic amplifier and AF amplifier. MARWYN AND JOHN'S HOME PAGES John's homebrew page. My interest in electronics goes a long way back - I think the Ladybird book "Magnets, Bulbs and Batteries" was one of my earliest tutors; that had me hunting for double cotton covered wire at the time when it was becoming difficult to get.I remember making a working electric motor from a cork, a darning needle, two short pins, four long needles, two drawing pins, a magnet MARWYN AND JOHN'S HOME PAGESSEE MORE ON MARWYNANDJOHN.ORG.UK MARWYN AND JOHN'S HOME PAGESSEE MORE ON MARWYNANDJOHN.ORG.UK MARWYN AND JOHN'S HOME PAGES John's homebrew pages Simple band-pass filter for 23cm. The improved 23cm transverter had been tested in action but I wanted to add one final improvement - a bandpass filter.. There were two reasons for this. First, it is a Good Thing in that it significantly reduces the radiation of out-of-band signals if any are produced by thetransverter.
MARWYN AND JOHN'S HOME PAGES John's homebrew pages 2m diameter portable dish antenna I had seen a great design for a dish antenna with stressed struts to form the surface in the International Microwave Handbook (2nd edition, 2008). However it was very well engineered in metal, and I don't have the facilities to do that. MARWYN AND JOHN'S HOME PAGES John's homebrew pages Portable 12 element 70cm yagi antenna. Following on from the 2m 7 ele Yagi, I want to start moving up in frequency. The FT-817 is a bit short of power but maybe a decent portable antennawill help!
MARWYN AND JOHN'S HOME PAGES 2m Lambda Loop Antenna. My location in the city is not a good one. First, it's not on the top of a hill - it's halfway down a north facing slope. Secondly, it's a flat in a fairly dense residential area, and consequently the level of electrical noise is severe - that's why most of my operating is /P - MARWYN AND JOHN'S HOME PAGES Astronomy. John has spent much of his life as a professional astronomer, working in the Institute for Astronomy (ifA) at the Royal Observatory, Edinburgh.The IfA is part of the School of Physics in the University of Edinburgh, where John also worked for a year as School Administrator after a period as Associate Dean in the College of Science and Engineering. MARWYN AND JOHN'S HOME PAGES Family history. Originally we put this material online for family use; we had done some research in 1985 in the Shetland Archive, and written it up (in longhand!) and sent photocopies around the family. MARWYN AND JOHN'S HOME PAGES Sweden , July 2002. Our summer holiday was in mainland Scandinavia for the first time (we went to the Faeroe Islands a long time ago). We travelled by ferry from Newcastle to Gothenurg, and took Waka Iti on the top of the car with us. The scenery was superb, and John at last visited the Kon Tiki museum and the Viking Ship museum on a day trip MARWYN AND JOHN'S HOME PAGES John's amateur radio pages. After quite a lot of years of being off the air (2 November 1993 to 2 September 2007, according to the logbook!), I decided it was time to get going with amateur radio again. I was licensed in 1978 as GM8OTI, have always been interested in 'homebrew' equipment (I'm a physicist, after all!) and at last amback on air
MARWYN AND JOHN'S HOME PAGES Boatbuilding at home. I've also built a few boats and intend to build another one yet. My first was Mildred , an 8 foot (2.5m) pram dinghy; she's still in good condition and I hope to sail her again before long. On the boatbuilding at home pages you can see some details of this build, Aoraki, and another Wharram design, my outrigger canoeWaka Iti.
MARWYN AND JOHN'S HOME PAGES The design values for the inductors were 59.649nH and 102.724nH, and for the capacitors 28.527pF. The practical design looks like this, with the series/parallel capacitors giving me 28.5pF: The inductors were constructed as follows and can be seen in the photo above: MARWYN AND JOHN'S HOME PAGES A 100 microamp meter is used as the detector (100-0-100 microamps here since that's what I had available). I set it up so the meter needle goes in the direction the switch is set to - forward or reverse. The rotary switch is for the range setting, which has a resistor in series with the meter for each range apart from the most sensitive; they MARWYN AND JOHN'S HOME PAGES John's homebrew pages Portable 12 element 70cm yagi antenna. Following on from the 2m 7 ele Yagi, I want to start moving up in frequency. The FT-817 is a bit short of power but maybe a decent portable antennawill help!
MARWYN AND JOHN'S HOME PAGES The folded dipole tok a few tweaks to get right, using a broom handle and file handle as the hard round surfaces to bend the copper on. It's mounted on a piece of prespex, to which the BNC connector is also fastened; the dipole is simply well soldered to the connector pin. This close-up shows the balun which matches the coax to the foldeddipole.
MARWYN AND JOHN'S HOME PAGES 2m Lambda Loop Antenna. My location in the city is not a good one. First, it's not on the top of a hill - it's halfway down a north facing slope. Secondly, it's a flat in a fairly dense residential area, and consequently the level of electrical noise is severe - that's why most of my operating is /P - MARWYN AND JOHN'S HOME PAGES where you will find details of some of the things that we made available to friends and family. MARWYN AND JOHN'S HOME PAGES Boatbuilding at home. I've also built a few boats and intend to build another one yet. My first was Mildred , an 8 foot (2.5m) pram dinghy; she's still in good condition and I hope to sail her again before long. On the boatbuilding at home pages you can see some details of this build, Aoraki, and another Wharram design, my outrigger canoeWaka Iti.
MARWYN AND JOHN'S HOME PAGES Battery boxes are at the bottom (also DC in connectors for the external PSU), with 4 crystals installed for S20, S21, S22 and R6. I eventually replaced R6 with S23. In the view below, the receiver board is on the left, and the transmitter board centre, just to the left of the battery box. Other boards include mic amplifier and AF amplifier. MARWYN AND JOHN'S HOME PAGES John's homebrew page. My interest in electronics goes a long way back - I think the Ladybird book "Magnets, Bulbs and Batteries" was one of my earliest tutors; that had me hunting for double cotton covered wire at the time when it was becoming difficult to get.I remember making a working electric motor from a cork, a darning needle, two short pins, four long needles, two drawing pins, a magnet MARWYN AND JOHN'S HOME PAGESSEE MORE ON MARWYNANDJOHN.ORG.UK MARWYN AND JOHN'S HOME PAGES John's homebrew pages Simple band-pass filter for 23cm. The improved 23cm transverter had been tested in action but I wanted to add one final improvement - a bandpass filter.. There were two reasons for this. First, it is a Good Thing in that it significantly reduces the radiation of out-of-band signals if any are produced by thetransverter.
MARWYN AND JOHN'S HOME PAGES A 13cm (2.3GHz) transverter with 432MHz IF. I decided to try to move up the microwave bands one by one - so 13cm comes after 23cm. Whether or not I'll be able to resist jumping straight to 3cm at some stage we'll have to see. After using multiplier designs for the local oscillators of my 23cm transverters, I decided to try aPLL-synthesiser
MARWYN AND JOHN'S HOME PAGES where you will find details of some of the things that we made available to friends and family. MARWYN AND JOHN'S HOME PAGES Boatbuilding at home. I've also built a few boats and intend to build another one yet. My first was Mildred , an 8 foot (2.5m) pram dinghy; she's still in good condition and I hope to sail her again before long. On the boatbuilding at home pages you can see some details of this build, Aoraki, and another Wharram design, my outrigger canoeWaka Iti.
MARWYN AND JOHN'S HOME PAGES Battery boxes are at the bottom (also DC in connectors for the external PSU), with 4 crystals installed for S20, S21, S22 and R6. I eventually replaced R6 with S23. In the view below, the receiver board is on the left, and the transmitter board centre, just to the left of the battery box. Other boards include mic amplifier and AF amplifier. MARWYN AND JOHN'S HOME PAGES John's homebrew page. My interest in electronics goes a long way back - I think the Ladybird book "Magnets, Bulbs and Batteries" was one of my earliest tutors; that had me hunting for double cotton covered wire at the time when it was becoming difficult to get.I remember making a working electric motor from a cork, a darning needle, two short pins, four long needles, two drawing pins, a magnet MARWYN AND JOHN'S HOME PAGESSEE MORE ON MARWYNANDJOHN.ORG.UK MARWYN AND JOHN'S HOME PAGES John's homebrew pages Simple band-pass filter for 23cm. The improved 23cm transverter had been tested in action but I wanted to add one final improvement - a bandpass filter.. There were two reasons for this. First, it is a Good Thing in that it significantly reduces the radiation of out-of-band signals if any are produced by thetransverter.
MARWYN AND JOHN'S HOME PAGES A 13cm (2.3GHz) transverter with 432MHz IF. I decided to try to move up the microwave bands one by one - so 13cm comes after 23cm. Whether or not I'll be able to resist jumping straight to 3cm at some stage we'll have to see. After using multiplier designs for the local oscillators of my 23cm transverters, I decided to try aPLL-synthesiser
MARWYN AND JOHN'S HOME PAGES where you will find details of some of the things that we made available to friends and family. MARWYN AND JOHN'S HOME PAGES Polynesian catamaran pages. Yes, such an organisation as the Polynesian Catamaran Association used to exist, and might still! I'm a fan of Polynesian catamarans, as interpreted by James Wharram, and there's more about these on my polynesian catamaran pages. Sunshine was actually a Wharram design (though with modified cabin tops) Tiki 21; my previous boat, Aoraki, was also a polynesian MARWYN AND JOHN'S HOME PAGES Sweden , July 2002. Our summer holiday was in mainland Scandinavia for the first time (we went to the Faeroe Islands a long time ago). We travelled by ferry from Newcastle to Gothenurg, and took Waka Iti on the top of the car with us. The scenery was superb, and John at last visited the Kon Tiki museum and the Viking Ship museum on a day trip MARWYN AND JOHN'S HOME PAGES John's amateur radio pages. After quite a lot of years of being off the air (2 November 1993 to 2 September 2007, according to the logbook!), I decided it was time to get going with amateur radio again. I was licensed in 1978 as GM8OTI, have always been interested in 'homebrew' equipment (I'm a physicist, after all!) and at last amback on air
MARWYN AND JOHN'S HOME PAGES 23cm DL6WU home brew 15 element beam. To test the 23cm transverter properly needed a real antenna. I decided to try a design by DL6WU, and this is written up fully with a link to the design software. My version uses 21.5mm plastic plumbing pipe for the boom and aluminium rod for the directors and reflector. The folded dipole feed is madefrom
MARWYN AND JOHN'S HOME PAGES Construction. For the first time in about 25 years I decided to make a pcb - I need to get back into that for future microwave projects (I know, you can get them made via online companies, I'll probably use theose for more complex jobs, but when it's simple anyway I like playing with chemicals, even though I'm a MARWYN AND JOHN'S HOME PAGES John's homebrew pages Microwave directional coupler - and an RF detector. More deviations from the main project. I was concerned that, as I manage to generate a bit more power (hopefully!) at microwave frequencies, a simple RF probe would not be sufficient for powermeasurement, and
MARWYN AND JOHN'S HOME PAGES John's homebrew pages Portable 12 element 70cm yagi antenna. Following on from the 2m 7 ele Yagi, I want to start moving up in frequency. The FT-817 is a bit short of power but maybe a decent portable antennawill help!
MARWYN AND JOHN'S HOME PAGES The folded dipole tok a few tweaks to get right, using a broom handle and file handle as the hard round surfaces to bend the copper on. It's mounted on a piece of prespex, to which the BNC connector is also fastened; the dipole is simply well soldered to the connector pin. This close-up shows the balun which matches the coax to the foldeddipole.
MARWYN AND JOHN'S HOME PAGES 2m Lambda Loop Antenna. My location in the city is not a good one. First, it's not on the top of a hill - it's halfway down a north facing slope. Secondly, it's a flat in a fairly dense residential area, and consequently the level of electrical noise is severe - that's why most of my operating is /P - MARWYN AND JOHN'S HOME PAGES where you will find details of some of the things that we made available to friends and family. MARWYN AND JOHN'S HOME PAGES John's amateur radio pages. After quite a lot of years of being off the air (2 November 1993 to 2 September 2007, according to the logbook!), I decided it was time to get going with amateur radio again. I was licensed in 1978 as GM8OTI, have always been interested in 'homebrew' equipment (I'm a physicist, after all!) and at last amback on air
MARWYN AND JOHN'S HOME PAGES Battery boxes are at the bottom (also DC in connectors for the external PSU), with 4 crystals installed for S20, S21, S22 and R6. I eventually replaced R6 with S23. In the view below, the receiver board is on the left, and the transmitter board centre, just to the left of the battery box. Other boards include mic amplifier and AF amplifier. MARWYN AND JOHN'S HOME PAGES John's homebrew page. My interest in electronics goes a long way back - I think the Ladybird book "Magnets, Bulbs and Batteries" was one of my earliest tutors; that had me hunting for double cotton covered wire at the time when it was becoming difficult to get.I remember making a working electric motor from a cork, a darning needle, two short pins, four long needles, two drawing pins, a magnet MARWYN AND JOHN'S HOME PAGESSEE MORE ON MARWYNANDJOHN.ORG.UK MARWYN AND JOHN'S HOME PAGESSEE MORE ON MARWYNANDJOHN.ORG.UK MARWYN AND JOHN'S HOME PAGES John's homebrew pages Simple band-pass filter for 23cm. The improved 23cm transverter had been tested in action but I wanted to add one final improvement - a bandpass filter.. There were two reasons for this. First, it is a Good Thing in that it significantly reduces the radiation of out-of-band signals if any are produced by thetransverter.
MARWYN AND JOHN'S HOME PAGES John's homebrew pages 2m diameter portable dish antenna I had seen a great design for a dish antenna with stressed struts to form the surface in the International Microwave Handbook (2nd edition, 2008). However it was very well engineered in metal, and I don't have the facilities to do that. MARWYN AND JOHN'S HOME PAGES John's homebrew pages Portable 12 element 70cm yagi antenna. Following on from the 2m 7 ele Yagi, I want to start moving up in frequency. The FT-817 is a bit short of power but maybe a decent portable antennawill help!
MARWYN AND JOHN'S HOME PAGES 2m Lambda Loop Antenna. My location in the city is not a good one. First, it's not on the top of a hill - it's halfway down a north facing slope. Secondly, it's a flat in a fairly dense residential area, and consequently the level of electrical noise is severe - that's why most of my operating is /P - MARWYN AND JOHN'S HOME PAGES where you will find details of some of the things that we made available to friends and family. MARWYN AND JOHN'S HOME PAGES John's amateur radio pages. After quite a lot of years of being off the air (2 November 1993 to 2 September 2007, according to the logbook!), I decided it was time to get going with amateur radio again. I was licensed in 1978 as GM8OTI, have always been interested in 'homebrew' equipment (I'm a physicist, after all!) and at last amback on air
MARWYN AND JOHN'S HOME PAGES Battery boxes are at the bottom (also DC in connectors for the external PSU), with 4 crystals installed for S20, S21, S22 and R6. I eventually replaced R6 with S23. In the view below, the receiver board is on the left, and the transmitter board centre, just to the left of the battery box. Other boards include mic amplifier and AF amplifier. MARWYN AND JOHN'S HOME PAGES John's homebrew page. My interest in electronics goes a long way back - I think the Ladybird book "Magnets, Bulbs and Batteries" was one of my earliest tutors; that had me hunting for double cotton covered wire at the time when it was becoming difficult to get.I remember making a working electric motor from a cork, a darning needle, two short pins, four long needles, two drawing pins, a magnet MARWYN AND JOHN'S HOME PAGESSEE MORE ON MARWYNANDJOHN.ORG.UK MARWYN AND JOHN'S HOME PAGESSEE MORE ON MARWYNANDJOHN.ORG.UK MARWYN AND JOHN'S HOME PAGES John's homebrew pages Simple band-pass filter for 23cm. The improved 23cm transverter had been tested in action but I wanted to add one final improvement - a bandpass filter.. There were two reasons for this. First, it is a Good Thing in that it significantly reduces the radiation of out-of-band signals if any are produced by thetransverter.
MARWYN AND JOHN'S HOME PAGES John's homebrew pages 2m diameter portable dish antenna I had seen a great design for a dish antenna with stressed struts to form the surface in the International Microwave Handbook (2nd edition, 2008). However it was very well engineered in metal, and I don't have the facilities to do that. MARWYN AND JOHN'S HOME PAGES John's homebrew pages Portable 12 element 70cm yagi antenna. Following on from the 2m 7 ele Yagi, I want to start moving up in frequency. The FT-817 is a bit short of power but maybe a decent portable antennawill help!
MARWYN AND JOHN'S HOME PAGES 2m Lambda Loop Antenna. My location in the city is not a good one. First, it's not on the top of a hill - it's halfway down a north facing slope. Secondly, it's a flat in a fairly dense residential area, and consequently the level of electrical noise is severe - that's why most of my operating is /P - MARWYN AND JOHN'S HOME PAGES Astronomy. John has spent much of his life as a professional astronomer, working in the Institute for Astronomy (ifA) at the Royal Observatory, Edinburgh.The IfA is part of the School of Physics in the University of Edinburgh, where John also worked for a year as School Administrator after a period as Associate Dean in the College of Science and Engineering. MARWYN AND JOHN'S HOME PAGES Family history. Originally we put this material online for family use; we had done some research in 1985 in the Shetland Archive, and written it up (in longhand!) and sent photocopies around the family. MARWYN AND JOHN'S HOME PAGES Sweden , July 2002. Our summer holiday was in mainland Scandinavia for the first time (we went to the Faeroe Islands a long time ago). We travelled by ferry from Newcastle to Gothenurg, and took Waka Iti on the top of the car with us. The scenery was superb, and John at last visited the Kon Tiki museum and the Viking Ship museum on a day trip MARWYN AND JOHN'S HOME PAGES John's amateur radio pages. After quite a lot of years of being off the air (2 November 1993 to 2 September 2007, according to the logbook!), I decided it was time to get going with amateur radio again. I was licensed in 1978 as GM8OTI, have always been interested in 'homebrew' equipment (I'm a physicist, after all!) and at last amback on air
MARWYN AND JOHN'S HOME PAGES Boatbuilding at home. I've also built a few boats and intend to build another one yet. My first was Mildred , an 8 foot (2.5m) pram dinghy; she's still in good condition and I hope to sail her again before long. On the boatbuilding at home pages you can see some details of this build, Aoraki, and another Wharram design, my outrigger canoeWaka Iti.
MARWYN AND JOHN'S HOME PAGES The design values for the inductors were 59.649nH and 102.724nH, and for the capacitors 28.527pF. The practical design looks like this, with the series/parallel capacitors giving me 28.5pF: The inductors were constructed as follows and can be seen in the photo above: MARWYN AND JOHN'S HOME PAGES A 100 microamp meter is used as the detector (100-0-100 microamps here since that's what I had available). I set it up so the meter needle goes in the direction the switch is set to - forward or reverse. The rotary switch is for the range setting, which has a resistor in series with the meter for each range apart from the most sensitive; they MARWYN AND JOHN'S HOME PAGES John's homebrew pages Portable 12 element 70cm yagi antenna. Following on from the 2m 7 ele Yagi, I want to start moving up in frequency. The FT-817 is a bit short of power but maybe a decent portable antennawill help!
MARWYN AND JOHN'S HOME PAGES The folded dipole tok a few tweaks to get right, using a broom handle and file handle as the hard round surfaces to bend the copper on. It's mounted on a piece of prespex, to which the BNC connector is also fastened; the dipole is simply well soldered to the connector pin. This close-up shows the balun which matches the coax to the foldeddipole.
MARWYN AND JOHN'S HOME PAGES 2m Lambda Loop Antenna. My location in the city is not a good one. First, it's not on the top of a hill - it's halfway down a north facing slope. Secondly, it's a flat in a fairly dense residential area, and consequently the level of electrical noise is severe - that's why most of my operating is /P - Marwyn and John's (archive) home pages ... where you will find details of some of the things that we made available to friends and family.Navigation: Â Home
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16 April 2018 - a new blogging site was set up at https://www.marwynandjohn.uk/ a while ago, using the Joomla content management system. This has now been moved to Wordpress as part of moving back to a real website instead of putting stuff on Facebook where it can easily get lost. There will be more changes yet!OUR WEB SITE
We started the site in 2000 and have made quite a few revisions over the years. It began with mostly polynesian catamaran stuff on it - but has expanded to include some of our old Shetland family history, and photographs from holidays for our family and friends to see. Most of the hits on the web site used to be for the family history and the polynesian catamarans. We get a moderate number looking at the photos as well. Now most of the hits are for the amateur radio stuff, as John has been getting back into the hobby over the last few years, and building lots of new gear, especially (now) for microwaves.LATEST
The Cathedral in Ferrara, September 2013MORE ...
John's current enthusiasm - microwaves in amateur radioMORE ...
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