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G0MGX IN THE SHACK
The new Icom IC-705. With much thanks to the boys at LAM Communications in Barnsley I got my paws on a pre-production release of the new Icom IC-705. Here's my brief introduction to the RX capabilities of this tiny new rig: YouTube. The Radio Shack by MarkG0MGX. Subscribe.
G0MGX IN THE SHACK: THE YAESU SCU-17 The Yaesu SCU-17. It's a Yaesu SCU-17 radio interface unit. I've owned a lot of radios in my time, the most "modern" perhaps being the Kenwood TS-990 and the G0MGX IN THE SHACK: NEW ANTENNAMABOB! This is the dimensions for the driven element from the manual: So if we first look at the dimension from the centre of the boom to the trap, this is listed above as being 74.5". Now, the individual parts are: 2.25" from the centre to the start of the metal - this is G0MGX IN THE SHACK: IC-7610 WITH WRITELOG Step 1 - change the IC-7610 so it uses the hex address of the 7850/7851 which is CI-V address 8E, thus: Then configure WriteLog for one of these rigs: I tend to manually swap between the IC-7610 and TS-890 (I never run them at the same time) but the TS-890 works as a TS-990 in the WriteLog software. I've only been dabbling in the JARTStest
G0MGX IN THE SHACK: RADIO ANALOG PTRX-7300 You may well have seen adverts for the PTRX-7300 from Radio Analog. This is some kind of new fangled adaptormabob for the Icom IC-7300 that gives you an RF output that you can hook up to an external SDR for a panadapter display. Well, I ordered one. Here are the bits that you get (but not the screwdriver): You start by taking the radio top G0MGX IN THE SHACK: TS-890 But mine is an early one, so here we go: Step 1 - turn radio upside down and disconnect all DC supply: Step 1 - remove bottom cover: Step 3 - remove the smaller of the two cover plates: Step 4 - for 5MHz coverage you need to snip the R57 link highlighted below before and after: There are also clearly 4 chip type 0R resistors (or space for)on
G0MGX IN THE SHACK: MORE 23CM POWER REQUIRED! More 23cm Power Required! Well, The other night, there were a few of us trying out JT65C on 23cm. I could decode quite a few of the other stations but couldn't be heard. This is no surprise as I was using only 10W out of my IC-9100. Quite a while ago I bought a 23cm PA module from PE1RKI - now this is a fairly serious bit of kit that Ihadn't
G0MGX IN THE SHACK: THE TIGERTRONICS SIGNALINK USB One of the most important mods in the link above is the replacement of a cap on the board with a 33uF value component. My Signalink already had 33uF onboard so this was left as-is. G0MGX IN THE SHACK: ES'HAIL-2 Es'hail-2 - really? Well, I've just lashed together a first attempt at receiving the downlink from Es'hail-2. If you have been asleep, the is the first ever Geostationary Amateur Satellite and is a bit fab 'n' groovy! I'm just using an Amazon sourced LNB: I've stuck it on a dish I had lying in the hedge and attached it to an Azimuth and G0MGX IN THE SHACK: FT-847 PA MOD Now, to make the mod described by PA1O, Marc, I need to lift the PA board out. This was a bit scary as I had to remove all the screws holding the MOSFETs onto the heatsync and then very gently flip theboard over.
G0MGX IN THE SHACK
The new Icom IC-705. With much thanks to the boys at LAM Communications in Barnsley I got my paws on a pre-production release of the new Icom IC-705. Here's my brief introduction to the RX capabilities of this tiny new rig: YouTube. The Radio Shack by MarkG0MGX. Subscribe.
G0MGX IN THE SHACK: THE YAESU SCU-17 The Yaesu SCU-17. It's a Yaesu SCU-17 radio interface unit. I've owned a lot of radios in my time, the most "modern" perhaps being the Kenwood TS-990 and the G0MGX IN THE SHACK: NEW ANTENNAMABOB! This is the dimensions for the driven element from the manual: So if we first look at the dimension from the centre of the boom to the trap, this is listed above as being 74.5". Now, the individual parts are: 2.25" from the centre to the start of the metal - this is G0MGX IN THE SHACK: IC-7610 WITH WRITELOG Step 1 - change the IC-7610 so it uses the hex address of the 7850/7851 which is CI-V address 8E, thus: Then configure WriteLog for one of these rigs: I tend to manually swap between the IC-7610 and TS-890 (I never run them at the same time) but the TS-890 works as a TS-990 in the WriteLog software. I've only been dabbling in the JARTStest
G0MGX IN THE SHACK: RADIO ANALOG PTRX-7300 You may well have seen adverts for the PTRX-7300 from Radio Analog. This is some kind of new fangled adaptormabob for the Icom IC-7300 that gives you an RF output that you can hook up to an external SDR for a panadapter display. Well, I ordered one. Here are the bits that you get (but not the screwdriver): You start by taking the radio top G0MGX IN THE SHACK: TS-890 But mine is an early one, so here we go: Step 1 - turn radio upside down and disconnect all DC supply: Step 1 - remove bottom cover: Step 3 - remove the smaller of the two cover plates: Step 4 - for 5MHz coverage you need to snip the R57 link highlighted below before and after: There are also clearly 4 chip type 0R resistors (or space for)on
G0MGX IN THE SHACK: MORE 23CM POWER REQUIRED! More 23cm Power Required! Well, The other night, there were a few of us trying out JT65C on 23cm. I could decode quite a few of the other stations but couldn't be heard. This is no surprise as I was using only 10W out of my IC-9100. Quite a while ago I bought a 23cm PA module from PE1RKI - now this is a fairly serious bit of kit that Ihadn't
G0MGX IN THE SHACK: THE TIGERTRONICS SIGNALINK USB One of the most important mods in the link above is the replacement of a cap on the board with a 33uF value component. My Signalink already had 33uF onboard so this was left as-is. G0MGX IN THE SHACK: ES'HAIL-2 Es'hail-2 - really? Well, I've just lashed together a first attempt at receiving the downlink from Es'hail-2. If you have been asleep, the is the first ever Geostationary Amateur Satellite and is a bit fab 'n' groovy! I'm just using an Amazon sourced LNB: I've stuck it on a dish I had lying in the hedge and attached it to an Azimuth and G0MGX IN THE SHACK: FT-847 PA MOD Now, to make the mod described by PA1O, Marc, I need to lift the PA board out. This was a bit scary as I had to remove all the screws holding the MOSFETs onto the heatsync and then very gently flip theboard over.
G0MGX IN THE SHACK: 2020 The new Icom IC-705. With much thanks to the boys at LAM Communications in Barnsley I got my paws on a pre-production release of the new Icom IC-705. Here's my brief introduction to the RX capabilities of this tiny new rig: YouTube. The Radio Shack by Mark G0MGX. Subscribe. Icom IC-705 - G0MGX IN THE SHACK: MORE ADF5355 The ADF5355 uses a 100 MHz clock which is generated using the ADF4351 from last time which in turn is clocked by the shack 10MHz frequency reference. The initialisation of the ADF4351 is done by the MicroMite over SPI, the SPI to the ADF5355 is from the SAMD21 processor. Here is an example of the 13 register values being sent: G0MGX IN THE SHACK: MORE 23CM POWER REQUIRED! More 23cm Power Required! Well, The other night, there were a few of us trying out JT65C on 23cm. I could decode quite a few of the other stations but couldn't be heard. This is no surprise as I was using only 10W out of my IC-9100. Quite a while ago I bought a 23cm PA module from PE1RKI - now this is a fairly serious bit of kit that Ihadn't
G0MGX IN THE SHACK: MICROWAVES Well, Following the build of my amplifier for 23cm here.I've been involved in some on-air tests of the JT modes on 23cm. Here's a screen shot of my signels on JT65C as G0MGX IN THE SHACK: TS-990 ON 5MHZ OR 60M TS-990 on 5MHz or 60M. Well, I finally decided to open up the TS-990 so I could use it to TX on the 5MHz UK allocation. The only way I am aware of is to perform the "TX Anywhere" mod. So here it is: We start with the radio upside down: And remove the base: The we remove the "L" shaped metal RF cover: And now close up, we are looking for R335: G0MGX IN THE SHACK: RF EARTH The main earth coming into the shack is the connection you can see on the left hand side and each of the other six points are fed by separate earth cables to the individual pieces of equipment. This seems like a much more sensible arrangement to me than I had previously and I think this qualifies as a decent RF earth. Cat didn'tseem too bothered:
G0MGX IN THE SHACK: FT-847 PA MOD Now, to make the mod described by PA1O, Marc, I need to lift the PA board out. This was a bit scary as I had to remove all the screws holding the MOSFETs onto the heatsync and then very gently flip theboard over.
G0MGX IN THE SHACK: IC-7300 IC-7300 - the first Casualty? You will remember last time that I came home with a new IC-7300. I've played with it quite a bit and it seemed to be an excellent radio with very good close in signal rejection on receive. Yesterday I was using the radio on WSJT and noticed that even though the power output was set at 40% and the audio drive levels G0MGX IN THE SHACK: 5MHZ SHORT DIPOLE I've managed to fit this antenna into the back garden today without getting it too close to anything else. My MFJ Antenna Analyser thingamabob suggested that the SWR and impedance of the antenna was good at the target frequency; after getting some RG58 and running it back to the shack, the radios seem to agree also. G0MGX IN THE SHACK: AUGUST 2013 Well, Been fiddling at home a bit recently, changed a few things around and played mostly with JT9. Yesterday morning I was calling CQ on 20M when VK1DW called me - he's in Holder, Australia - that's just over 10,500 miles away - thanks Dean!G0MGX IN THE SHACK
Musings from the Radio Shack of G0MGX in Central England.SEARCH THIS BLOG
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SATURDAY, 19 OCTOBER 2019 JARTS - DOESN'T TIME FLYWell,
It's the JARTS RTTY test once again and the bands are full of RTTYsignals.
Propagation contitions are very poor, but there are plenty of signalsabout.
I've been using the IC-7610 today and it's a superb RTTY radio: The internal decoding capability is also excellent: Here is the 40M band early on the Saturday evening - CW and RTTYeverywhere!
Here's a map of my log:Local conditions.
Posted by G0MGX
at 17:19
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SATURDAY, 24 AUGUST 2019DVB-S2 - REALLY?
A very quick special message broadcast on the QO-100 Digital AmateurTelevision:
Local conditions.
Posted by G0MGX
at 12:16
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SATURDAY, 17 AUGUST 2019 RADIO ANALOG PTRX-7300 - REALLY?Well,
You may well have seen adverts for the PTRX-7300 from Radio Analog. This is some kind of new fangled adaptormabob for the Icom IC-7300 that gives you an RF output that you can hook up to an external SDR for a panadapter display. Well, I ordered one. Here are the bits that you get (but not the screwdriver): You start by taking the radio top cover off: Then we disconnect the cable that attaches to the rear external tuner connector and remove it: Then the new gubbins clips into the space where the external tunerconnector was:
Hook up the cable into the now vacated socket for the external tunerconnector:
and then pull a plug out of the radio PCB and insert into the newgubbins:
Then we have a supplied cable from the new gubbins to the PCB socket we just disconnected: And thats it! Now externally the tuner connector is re-connected and also a flying lead with an SMA connector to feed to the SDR. This isextremely neat!
So once we have all that done, I have set up SDR Console:and it just works.
Simples!
Posted by G0MGX
at 19:54
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IC-7300 ,
Radio Analog PTRX-7300 TUESDAY, 13 AUGUST 2019 UP-CONVERTING - YOU WHAT?Well,
Further to the PA
I made last
time , today I
have been finishing off the up-converter to accompany it. The theory goes something like this:* The Portsdown
will output
DATV on 439 MHz through the transverter output * This will be sent down the garden in Ecoflex-15 * The co-ax losses will be compensated for using the 70cm amp I madeback here
* This will feed the SG Labs transverter we played with back here * The output of the transverter is then boosted by the Wi-Fi ampfrom here
* Finally the output is fed to the PA Here's the up-converter in its finished form, there's a simple sequencer in there to handle the PTT switching and send a PTT signalto the PA:
Tomorrow I hope to install this and the PA in the small shed I have near the dish - then for some on-air testing. This is the output of the up-converter DVB-S, SR250, FEC 1/2 - received with an antenna across the bench:** UPDATE**
I've not yet installed the equipment in the garden, so I have about 4-5dB minimum of cable loss between the PA and the dish feed. However, here's my first RX of my own TV signal through Es-Hail'2:** UPDATE 2 **
I've moved the gubbins to the small shed near the dish: And am now sending 439MHz (ish) down the garden from the Portsdown. This is a 333KS transmission via QO-100, you can see my signal on the left of the Mini Tioune software at 10,497.750 MHz: And here is a testcard:Local conditions.
Posted by G0MGX
at 18:15
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SUNDAY, 11 AUGUST 2019EVEN MORE POWER!
Well,
I've been messing about and finishing off my 13cm linear. The idea is to make something that will work on the 2.3GHz amateur band frequencies as well as 2.4GHz for DATV on Es'hail-2. This has been quite a challenge, but eventually we have something working ready for on air testing. This is the final build, which even though I say so myself, is amasterpiece:
The PA module itself is something from my travels made by PowerWave: There are five MOSFETS in total - each one is a SRF7068H5HS. This is controlled by a W6PQLAmplifier Control
Board which in turn uses an external FET switch to turn on and off the 12V bias lines to the PA, provide the sequencing necessary, generate an ALC voltage (just in case I need it later), generate an external PTT out for switching VLNAs or other external gubbins. There's also a chassis mounted directional coupler (a NARDA model 31152) which provides a -30dB forward and reflected port output which is attenuated and rectified to produce a DC voltage. There's a forward voltage for a future power meter and also a reflected power voltage to activate a trip if the SWR should exceed 2:1. I've even included a thermistor on the main heatsync and a trip in the amp control to switch on the fans or even shutdown the amp when overtemperature.
I'm seeing about 26dB of gain from the amplifier and it will generate about 250W of CW on 2.407 GHz so should easily generate the 30-40W I might need for some DATV experiments. Here is the unit under test, I'm using the Portsdownto generate a
signal at 432.75 MHz, then using the mixer from the UK Microwave Group forum to mix in 1975 MHz to generate an output on 2004.75 MHz. This is then amplified up and fed to the linear. The forward port of the directional coupler (-30dB) is coupled via another 20dB attenuator to my XL Microwavemeter. A short
piece of coathanger shoved into the front of the Spectrum Analyser allows me to measure the harmonics and also look at the TX waveform. A thing of beauty is a joy to behold! I'm delighted with this.Posted by G0MGX
at 10:16
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Portsdown 2019
,
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FRIDAY, 28 JUNE 2019 13GHZ SIG GEN - YOU CAN'T BE SERIOUS?Well,
You may recall back here when I became very inspired by a project by GM8BJF using some eBay sourced Chinese modules to create an ADF4351 based signal generator. There's another variation on that theme that has been published in the May 2019 Scatterpoint . Scatterpoint is the journal of the UK Microwave group , membership is about 3 bob and a conker so you have no excuses for notjoining.
This time it uses an ADF5355 to generate signals from 52MHz all theway up to 13.6GHz.
The 4.4GHz generator has proved extremely useful, this one is a must. I've modified the design and the software a little so that the 100MHz clock is generated by am ADF4351, rather than an OCXO as per Brian'sdesign.
Brian has made the software available here , and my modified versionis here . The
AD4351 is a version of the evaluation board from SV1AFN - and it gets its reference from my 10MHz shack frequency reference. The software runs on a SAMD21 ARM Cortex M0 which runs at a 48 MHz clock rate. This is supported by the Arduino IDE but is not somethingI had used before.
Its still WIP, but the project is up and running OK.How cool is this?
Here's Miss Maggie Cat and Miss Pepper Cat doing what they do best:Posted by G0MGX
at 15:38
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ADF5355 , GM8BJF
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SATURDAY, 8 JUNE 2019 MORE SEQUENCING SECRETSWell,
I've been making another sequencer with a bias-t included; it builds on the stuff I did back here. This
time I ordered some kits from the very excellent W6PQL.
The basic schematic for the sequencer is this:Here's the build:
You can see the sequencer, a FET switch (which is used to turn off the power to the Bias-T during TX) plus the bias-T itself. The bias-T is the sequencer event 1, events 2, 3 and 4 are ground on TX and available on the back panel as RCA sockets. I've added some LEDs to the front panel to show the events switching and also a control to adjust the delay timing of the sequencing. The case is recycled from an old project: I plan to use this to control the Transverter(s) and other gubbins I mentioned related to EME last timeat
the bottom of the post.Local conditions.
Posted by G0MGX
at 10:01
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TS-890 Again
Well, I've been asked to put a video together on why I love the TS-890; well here it is:*
Radio Analog PTRX-7300 - Really? Well, You may well have seen adverts for the PTRX-7300 from Radio Analog. This is some kind of new fangled adaptormabob for the IcomIC-7...
*
IC-7300 - the first Casualty? Well, You will remember last time that I came home with a new IC-7300. I've played with it quite a bit and it seemed to be anexcelle...
*
TS-890 - 5MHz Mod
Well, My new shiny TS-890 didn't transmit on 5MHz out of the box. Kenwood have released a modification procedure to the dealers expla...*
TS-890 - really?
Well, I'm one of the first in the UK to receive a new Kenwood TS-890 . Here it is: Unbelievably (as was the case with the TS-9...FOLLOW BY EMAIL
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