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SLIM JIM / J POLE ANTENNA CALCULATOR Slim Jim and J Pole calculator. Slim Jim / J Pole antenna calculator. D. 50Ω feed point. Adjust for 1:1 SWR. (λ/40)*vf. Before we start, be prepared to experiment! The calculator will get you close (or spot on if you’re lucky), but there are so many variables. You can use an antenna analyser to easily find if you are too long or short. MAGNETIC LOOP ANTENNAS Magnetic Loop Antennas. I decided to experiment with Magnetic Loops. First, I tried something simple. A 145MHz 2m loop. Using the software at the bottom of this page, I worked out that a 36cm length of wire, will need a capacitance of around 3.6pf, and around a 50% efficiency. Making it any larger, and more efficient at 2m requires too small of SIMPLE CW TOUCH KEYER CIRCUITS Simple CW Touch Keyer Circuits. Here are some simple CW touch keyer circuits for making your own CW touch paddle key. The first circuit in Figure 1 is very simple, just consisting of two NPN transistors! It works by using the 50Hz mains voltage that is induced into your body by nearby mains wiring to provide a small base current which switches LOADED QUARTER WAVE ANTENNA INDUCTANCE CALCULATOR Here is a formula and calculator for creating a loaded (shortened) quarter wave vertical or balanced dipole. The original javascript was created by Jack Ponton and can be seen here. As seen on his page, the original formula seems to come from an article by J. MFJ-971 PORTABLE ANTENNA TUNER MODIFICATIONS The MFJ-971 has the potential to be a great portable tuner. It is a small, compact tuner that has a sensitive SWR circuit allowing precise tuning with low power thanks to its 6w FSD setting and it has outputs for coax, wire and balanced feeder (although I won't talk about the MFJ 'heavy duty' 1:4 vo 144MHZ 2M PORTABLE YAGI VHF BEAM ANTENNA This page contains construction details on a 2 metre 144MHz VHF Yagi beam antenna, designed for portable use. Since an old 5 element version (v1) of my antenna was shown in the July 2011 edition of RadCom, a few people have contacted me asking for some information on how it was constructed.It has gone through a few revisions over the years (this is version 4) and is now a 6 element Yagi Uda ALKALINE BATTERY CHARGING CIRCUIT Here is a constant current supply circuit schematic diagram using the LM317 variable voltage regulator. It is a very simple circuit for charging alkaline batteries. It will provide a stable constant current which is adjustable by switching different values of resistors. The input voltage must be at least 6v higher than the battery (s) you wish M0UKD – AMATEUR RADIO BLOG – HOME OF JOHN, M0UKD. AMATEURHOMEABOUT MEHOMEBREWCALCULATORSMODSREVIEWS M0UKD - Amateur Radio website of John M0UKD. Contains information, pictures, circuits and projects. HOMEMADE CAROLINA WINDOM ANTENNA Homemade Carolina Windom antenna. Coax fed OCF ‘Windom’ antenna. Here is my home HF antenna. It is an off centre fed dipole, with 10 feet of vertical radiator. It needs no tuner on 40m, 20m and 10m. It also works fine on all bands above 40m with a tuner, and even below 40m on 60m, and 80m, although the coax losses will be higher. PRINTABLE AMATEUR RADIO LOGBOOKS Below are some printable logbooks (or logsheets) which I made to use whilst operating portable, such as SOTA. They are available in PDF format, for you to print on to A4 paper. The portrait version includes three extra columns compared to the landscape version, which are band,mode and power.
SLIM JIM / J POLE ANTENNA CALCULATOR Slim Jim and J Pole calculator. Slim Jim / J Pole antenna calculator. D. 50Ω feed point. Adjust for 1:1 SWR. (λ/40)*vf. Before we start, be prepared to experiment! The calculator will get you close (or spot on if you’re lucky), but there are so many variables. You can use an antenna analyser to easily find if you are too long or short. MAGNETIC LOOP ANTENNAS Magnetic Loop Antennas. I decided to experiment with Magnetic Loops. First, I tried something simple. A 145MHz 2m loop. Using the software at the bottom of this page, I worked out that a 36cm length of wire, will need a capacitance of around 3.6pf, and around a 50% efficiency. Making it any larger, and more efficient at 2m requires too small of SIMPLE CW TOUCH KEYER CIRCUITS Simple CW Touch Keyer Circuits. Here are some simple CW touch keyer circuits for making your own CW touch paddle key. The first circuit in Figure 1 is very simple, just consisting of two NPN transistors! It works by using the 50Hz mains voltage that is induced into your body by nearby mains wiring to provide a small base current which switches LOADED QUARTER WAVE ANTENNA INDUCTANCE CALCULATOR Here is a formula and calculator for creating a loaded (shortened) quarter wave vertical or balanced dipole. The original javascript was created by Jack Ponton and can be seen here. As seen on his page, the original formula seems to come from an article by J. MFJ-971 PORTABLE ANTENNA TUNER MODIFICATIONS The MFJ-971 has the potential to be a great portable tuner. It is a small, compact tuner that has a sensitive SWR circuit allowing precise tuning with low power thanks to its 6w FSD setting and it has outputs for coax, wire and balanced feeder (although I won't talk about the MFJ 'heavy duty' 1:4 vo 144MHZ 2M PORTABLE YAGI VHF BEAM ANTENNA This page contains construction details on a 2 metre 144MHz VHF Yagi beam antenna, designed for portable use. Since an old 5 element version (v1) of my antenna was shown in the July 2011 edition of RadCom, a few people have contacted me asking for some information on how it was constructed.It has gone through a few revisions over the years (this is version 4) and is now a 6 element Yagi Uda ALKALINE BATTERY CHARGING CIRCUIT Here is a constant current supply circuit schematic diagram using the LM317 variable voltage regulator. It is a very simple circuit for charging alkaline batteries. It will provide a stable constant current which is adjustable by switching different values of resistors. The input voltage must be at least 6v higher than the battery (s) you wish MAGNETIC LOOP ANTENNAS Magnetic Loop Antennas. I decided to experiment with Magnetic Loops. First, I tried something simple. A 145MHz 2m loop. Using the software at the bottom of this page, I worked out that a 36cm length of wire, will need a capacitance of around 3.6pf, and around a 50% efficiency. Making it any larger, and more efficient at 2m requires too small of ANTENNAS – M0UKD – AMATEUR RADIO BLOG Various antennas I have built. Antennas 70MHz Quarter Wave Ground Plane - Building a simple 1/4 wave ground plane antenna for the 4m band. 144MHz Portable Yagi Beam - A compact, portable 6 element 144MHz Yagi antenna. built for quick assembly in the field or up mountains. 144MHZ 2M PORTABLE YAGI VHF BEAM ANTENNA This page contains construction details on a 2 metre 144MHz VHF Yagi beam antenna, designed for portable use. Since an old 5 element version (v1) of my antenna was shown in the July 2011 edition of RadCom, a few people have contacted me asking for some information on how it was constructed.It has gone through a few revisions over the years (this is version 4) and is now a 6 element Yagi Uda ERP & EIRP CALCULATOR The Effective Isotropic Radiated Power (EIRP) is the apparent power transmitted towards the receiver, if it is assumed that the signal is radiated equally in all directions, such as as a spherical wave emanating from a point source; in other words, the arithmetic product of the power supplied to an MØUKD - HOMEMADE CAROLINA WINDOM HF ANTENNA MØUKD - Homemade Carolina Windom HF Antenna. Here is my home HF antenna. It is an off centre fed dipole, with 10 feet of vertical radiator. It needs no tuner on 40m, 20m and 10m. It also works fine on all bands above 40m with a tuner, and even below 40m on 60m, and END FED HALF WAVE ANTENNA COUPLER (EFHW) End Fed Half Wave (6.65m @ 21.2MHz, ground mounted) SWR – Actual bandwidth on the 50Ω side of the coupler will be much narrower, due to the tuned circuit we are using. HOMEMADE 20 METRE BAND LOFT DIPOLE! So I decided to try and make a dipole, that will fit in the loft, for 20 metres. The loft here is quite small, so I used two 1.5litre water bottles, as coil formers, and wrapped whatever amount of wire was neccesary to get this thing to resonate at 14MHz and fit in my loftspace. I started off with about 6 metres of wire per element, with15
AIR CORED INDUCTOR CALCULATOR Air Cored Inductor Calculator. This calculator is useful when making antenna matching units, low pass filters, crystal sets, antenna traps, resonant circuits or anywhere where an air cored single layer inductor is required. Diameter and length of inductor are entered in millimetres along with the number of turns. ALKALINE BATTERY CHARGING CIRCUIT Here is a constant current supply circuit schematic diagram using the LM317 variable voltage regulator. It is a very simple circuit for charging alkaline batteries. It will provide a stable constant current which is adjustable by switching different values of resistors. The input voltage must be at least 6v higher than the battery (s) you wish I FINALLY PUT UP A DIPOLE FOR 70MHZ (4M) I finally put up a dipole for 70MHz (4m) Today, I finally built a ½ λ dipole for 4m. I have previously been using a folded ½ λ dipole made out of 450Ω balanced feeder, suspended in the loft, which is not ideal. I still had the coax outside on the roof and the pole which were both used previously for my 2m/70cm co-linear, which has been M0UKD – AMATEUR RADIO BLOG – HOME OF JOHN, M0UKD. AMATEURHOMEABOUT MEHOMEBREWCALCULATORSMODSREVIEWS M0UKD - Amateur Radio website of John M0UKD. Contains information, pictures, circuits and projects. HOMEBREW – M0UKD – AMATEUR RADIO BLOG This page contains projects and electronic circuits that I have built. Some are amateur radio related, others not. Antennas. 70MHz Quarter Wave Ground Plane – Building a simple 1/4 wave ground plane antenna for the 4m band.; 144MHz Portable Yagi Beam – A compact, portable 6 element 144MHz Yagi antenna. built for quick assembly in the field orup mountains.
CALCULATORS
Calculators. This page contains various javascript based calculators for electronics. Slim Jim and J-Pole antenna calculator – Build a cactus for any frequency. 1/4 Wave Ground Plane antenna calculator – Build a simple quarter wave with radials. Ω Ohm’s Law Calculator Ω – Enter 2 values from Voltage, Current, Power or Resistance, to ANTENNAS – M0UKD – AMATEUR RADIO BLOG Various antennas I have built. Antennas 70MHz Quarter Wave Ground Plane - Building a simple 1/4 wave ground plane antenna for the 4m band. 144MHz Portable Yagi Beam - A compact, portable 6 element 144MHz Yagi antenna. built for quick assembly in the field or up mountains.BALUNS AND UNUNS
Current (choke) Baluns. 1:1 Choke Balun – For use as a ‘tuner balun’ on the output of an unbalanced ATU for feeding a multiband doublet. 1:1 50Ω Choke Balun – Built with coax, to keep the impedance at 50Ω for feeding a coax fed half wave dipole. PRINTABLE AMATEUR RADIO LOGBOOKS Below are some printable logbooks (or logsheets) which I made to use whilst operating portable, such as SOTA. They are available in PDF format, for you to print on to A4 paper. The portrait version includes three extra columns compared to the landscape version, which are band,mode and power.
HOMEMADE CAROLINA WINDOM ANTENNA Homemade Carolina Windom antenna. Coax fed OCF ‘Windom’ antenna. Here is my home HF antenna. It is an off centre fed dipole, with 10 feet of vertical radiator. It needs no tuner on 40m, 20m and 10m. It also works fine on all bands above 40m with a tuner, and even below 40m on 60m, and 80m, although the coax losses will be higher. MØUKD - HOMEMADE CAROLINA WINDOM HF ANTENNA MØUKD - Homemade Carolina Windom HF Antenna. Here is my home HF antenna. It is an off centre fed dipole, with 10 feet of vertical radiator. It needs no tuner on 40m, 20m and 10m. It also works fine on all bands above 40m with a tuner, and even below 40m on 60m, and SLIM JIM / J POLE ANTENNA CALCULATOR Slim Jim and J Pole calculator. Slim Jim / J Pole antenna calculator. D. 50Ω feed point. Adjust for 1:1 SWR. (λ/40)*vf. Before we start, be prepared to experiment! The calculator will get you close (or spot on if you’re lucky), but there are so many variables. You can use an antenna analyser to easily find if you are too long or short. MFJ-971 PORTABLE ANTENNA TUNER MODIFICATIONS The MFJ-971 has the potential to be a great portable tuner. It is a small, compact tuner that has a sensitive SWR circuit allowing precise tuning with low power thanks to its 6w FSD setting and it has outputs for coax, wire and balanced feeder (although I won't talk about the MFJ 'heavy duty' 1:4 vo M0UKD – AMATEUR RADIO BLOG – HOME OF JOHN, M0UKD. AMATEURHOMEABOUT MEHOMEBREWCALCULATORSMODSREVIEWS M0UKD - Amateur Radio website of John M0UKD. Contains information, pictures, circuits and projects. HOMEBREW – M0UKD – AMATEUR RADIO BLOG This page contains projects and electronic circuits that I have built. Some are amateur radio related, others not. Antennas. 70MHz Quarter Wave Ground Plane – Building a simple 1/4 wave ground plane antenna for the 4m band.; 144MHz Portable Yagi Beam – A compact, portable 6 element 144MHz Yagi antenna. built for quick assembly in the field orup mountains.
CALCULATORS
Calculators. This page contains various javascript based calculators for electronics. Slim Jim and J-Pole antenna calculator – Build a cactus for any frequency. 1/4 Wave Ground Plane antenna calculator – Build a simple quarter wave with radials. Ω Ohm’s Law Calculator Ω – Enter 2 values from Voltage, Current, Power or Resistance, to ANTENNAS – M0UKD – AMATEUR RADIO BLOG Various antennas I have built. Antennas 70MHz Quarter Wave Ground Plane - Building a simple 1/4 wave ground plane antenna for the 4m band. 144MHz Portable Yagi Beam - A compact, portable 6 element 144MHz Yagi antenna. built for quick assembly in the field or up mountains.BALUNS AND UNUNS
Current (choke) Baluns. 1:1 Choke Balun – For use as a ‘tuner balun’ on the output of an unbalanced ATU for feeding a multiband doublet. 1:1 50Ω Choke Balun – Built with coax, to keep the impedance at 50Ω for feeding a coax fed half wave dipole. PRINTABLE AMATEUR RADIO LOGBOOKS Below are some printable logbooks (or logsheets) which I made to use whilst operating portable, such as SOTA. They are available in PDF format, for you to print on to A4 paper. The portrait version includes three extra columns compared to the landscape version, which are band,mode and power.
HOMEMADE CAROLINA WINDOM ANTENNA Homemade Carolina Windom antenna. Coax fed OCF ‘Windom’ antenna. Here is my home HF antenna. It is an off centre fed dipole, with 10 feet of vertical radiator. It needs no tuner on 40m, 20m and 10m. It also works fine on all bands above 40m with a tuner, and even below 40m on 60m, and 80m, although the coax losses will be higher. MØUKD - HOMEMADE CAROLINA WINDOM HF ANTENNA MØUKD - Homemade Carolina Windom HF Antenna. Here is my home HF antenna. It is an off centre fed dipole, with 10 feet of vertical radiator. It needs no tuner on 40m, 20m and 10m. It also works fine on all bands above 40m with a tuner, and even below 40m on 60m, and SLIM JIM / J POLE ANTENNA CALCULATOR Slim Jim and J Pole calculator. Slim Jim / J Pole antenna calculator. D. 50Ω feed point. Adjust for 1:1 SWR. (λ/40)*vf. Before we start, be prepared to experiment! The calculator will get you close (or spot on if you’re lucky), but there are so many variables. You can use an antenna analyser to easily find if you are too long or short. MFJ-971 PORTABLE ANTENNA TUNER MODIFICATIONS The MFJ-971 has the potential to be a great portable tuner. It is a small, compact tuner that has a sensitive SWR circuit allowing precise tuning with low power thanks to its 6w FSD setting and it has outputs for coax, wire and balanced feeder (although I won't talk about the MFJ 'heavy duty' 1:4 vo HOMEBREW – M0UKD – AMATEUR RADIO BLOG This page contains projects and electronic circuits that I have built. Some are amateur radio related, others not. Antennas. 70MHz Quarter Wave Ground Plane – Building a simple 1/4 wave ground plane antenna for the 4m band.; 144MHz Portable Yagi Beam – A compact, portable 6 element 144MHz Yagi antenna. built for quick assembly in the field orup mountains.
MAGNETIC LOOP ANTENNAS Magnetic Loop Antennas. I decided to experiment with Magnetic Loops. First, I tried something simple. A 145MHz 2m loop. Using the software at the bottom of this page, I worked out that a 36cm length of wire, will need a capacitance of around 3.6pf, and around a 50% efficiency. Making it any larger, and more efficient at 2m requires too small of SIMPLE CW TOUCH KEYER CIRCUITS Here are some simple CW touch keyer circuits for making your own CW touch paddle key. The first circuit in Figure 1 is very simple, just consisting of two NPN transistors! It works by using the 50Hz mains voltage that is induced into your body by nearby mains wiring to provide a small base current w ERP & EIRP CALCULATOR The Effective Isotropic Radiated Power (EIRP) is the apparent power transmitted towards the receiver, if it is assumed that the signal is radiated equally in all directions, such as as a spherical wave emanating from a point source; in other words, the arithmetic product of the power supplied to an IC-7200 – M0UKD – AMATEUR RADIO BLOG Transceiver efficiencies (FT-897D, FTDX1200 and IC-7200) John M0UKD. 21st October 2014. 1 Comment. The FT-897D is a very efficient transceiver for portable use, perhaps because it is designed for use with battery power in mind. As I recently purchased an Icom IC-7200 to replace it for HF use whilst portable, I thought I would do some testson
CAPACITIVE CW TOUCH KEY CIRCUITS Following on from the simple CW touch keys in the previous page, this page shows a capacitive touch project which is the ideal touch sensitive key solution. The project described here is a iambic capacitive touch key which uses 2 AA size batteries for 3v power,draws
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