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SPI Clock Speed
开云体育I Dunno… don’t remember if we covered this topic… but this could be a problem: ? ? ? Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ ? Owner - Operator Big Signal Ranch – K9ZC Staunton, Illinois ? Owner – Operator Villa Grand Piton – J68HZ Soufriere, St. Lucia W.I. Rent it: ? Moderator: North American QRO Group at Groups.IO. Moderator: Amateur Radio Builders Group at Groups.IO. ? email:? bill@... ? ? |
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Re: [SoftwareControlledHamRadio] T41 weird ray traces on display
开云体育Yes it has low pass filters in it with a corner frequency of 36MHz… ??Don’t want your SPI buss running up there! ? ? Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ ? Owner - Operator Big Signal Ranch – K9ZC Staunton, Illinois ? Owner – Operator Villa Grand Piton – J68HZ Soufriere, St. Lucia W.I. Rent it: ? Moderator: North American QRO Group at Groups.IO. Moderator: Amateur Radio Builders Group at Groups.IO. ? email:? bill@... ? ? From: [email protected] <[email protected]> On Behalf Of Glenn via groups.io
Sent: Wednesday, January 8, 2025 4:13 PM To: [email protected] Subject: Re: [AmateurRadioBuilders] [SoftwareControlledHamRadio] T41 weird ray traces on display ? Bill That chip comes up here as a? Video Filter, Butterworth, 6th Order, 3.3 to 5 V, 42 MHz, MSOP-10? Is that the device you used? ? Glenn? ? ? '72 ISUZU BELLETT SPORT Sent from my Samsung Galaxy S21 FE Smartphone. ? |
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Re: [SoftwareControlledHamRadio] T41 weird ray traces on display
开云体育BTW… the Video driver chip has a fixed gain of 2 so that was the original point of the input resistors…. ? ? Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ ? Owner - Operator Big Signal Ranch – K9ZC Staunton, Illinois ? Owner – Operator Villa Grand Piton – J68HZ Soufriere, St. Lucia W.I. Rent it: ? Moderator: North American QRO Group at Groups.IO. Moderator: Amateur Radio Builders Group at Groups.IO. ? email:? bill@... ? ? From: [email protected] <[email protected]> On Behalf Of K9HZ
Sent: Wednesday, January 8, 2025 1:56 PM To: [email protected] Subject: Re: [AmateurRadioBuilders] [SoftwareControlledHamRadio] T41 weird ray traces on display ? Schematic is attached…? The video buffer is an ADA4417-3ARMZ chip.? Its tiny to fit on the board so hot air soldering works best.? If this thing works, I’ll just get them pre-made with the chip pre-soldered on the board. ? There is a bit of testing to do for the right resistors to use to match the impedance between the Teensy and the driver.? I started with the sets of resistors R1-R2, R3-R4, and R5-R6 as (used as input voltage dividers and input impedance matchers) as Potentiometers… where, for example, the junction between R1 and R2 was the wiper… and the two ends became the other ends of the resistors as a convenient way to vary the inputs.? Little 1k pots work ok.? Once a good happy medium can be found, the pots can be replaced on the production boards with fixed resistors.? ? It’s a simple concept but appears to work… ? ? Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ ? Owner - Operator Big Signal Ranch – K9ZC Staunton, Illinois ? Owner – Operator Villa Grand Piton – J68HZ Soufriere, St. Lucia W.I. Rent it: ? Moderator: North American QRO Group at Groups.IO. Moderator: Amateur Radio Builders Group at Groups.IO. ? email:? bill@... ? ? From: [email protected] <[email protected]> On Behalf Of Jack, W8TEE via groups.io ? Bill: ? I'd like one and Al and I can use my machine as a test bed. What is the video buffer I need? If you have a schematic, could you send that to me and I'll pass along to Al, too. ? Jack, W8TEE ? On Wednesday, January 8, 2025 at 02:02:54 PM EST, K9HZ <bill@...> wrote: ? ? On this subject…? The problem is the SPI drivers in the Teensy and this has been reported in the PJRC forums as has been discussed before.? So far, the solution seems to me to place some resistors in series with the SPI control lines… but that solution is not routed in any science… but rather trial and error. ? ? About 4 months ago, I did dome research and understood that different drivers were needed between the Teensy and the SPI device (in this case, the display) for reliable operation.? I’ve seen this before… an outboard set of drivers would cure the problem… but they need to be something that doesn’t cause other problems (the V11 driver was a digital buss driver and the issue there is that… the hard off and on states cause the generation of harmonic noise that is not good for the radio).? I decided to investigate the use of some very high speed ANALOG video buffer/ driver chips (would not cause switching noise)… and I suspect they will work well and solve this problem. ? I had some little boards made that plug into the DISPLAY connector on the MAIN board (the little driver board sits right on the display connector) and the display plugs into it. See below.? I tried building one and it seemed to work well in that I was able to get several feet between the Main board and the display without any issues cropping up… but I don’t feel like I’ve had the time to really test it out properly.? I’ve attached the schematic to this note… and I will offer ANYONE in the USA one of the remaining nine boards if you will experiment with it (using the video amp I used or with any other circuitry that you find makes this work) and report to this group on your findings.? I just don’t have the time to complete it right now, and quite frankly my display works ok as it is now. ? Little boards look like this (J1 plugs into the motherboard socket – NO CABLE, while the display cable that you removed from the display connector on the MAIN board plugs into J2) : ? ? ? ? Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ ? Owner - Operator Big Signal Ranch – K9ZC Staunton, Illinois ? Owner – Operator Villa Grand Piton – J68HZ Soufriere, St. Lucia W.I. Rent it: ? Moderator: North American QRO Group at Groups.IO. Moderator: Amateur Radio Builders Group at Groups.IO. ? email:? bill@... ? ? From: [email protected] <[email protected]> On Behalf Of Frank Jandreau via groups.io ? Hello all, I've posted a few times regarding the random lines on the display. In addition, I have observed that these lines mysteriously appear for no reason. There were also other fixes posted on here. I found a post which suggested removing the display buffer IC, adding 100 ohm resistors on SCLK/SDA, and hard wiring the connections for SCLK, SDA, MIS0 and MIS1 from the main board to the display connector. I did this using four 2 conductor with shield audio cables and that has produced a rock solid solution. I've not seen lines since. I did this on my T41EP built from scratch (non 4SQRP kit). I have never seen the lines on my 4SQRP T41EP kit build. There were posts suggesting that ribbon cables were too small? and provided no shielding for these high speed signals to the display. As for the "fix" I'm not sure that the forum ever posted a definitive answer, just a lot of ideas. I hope that this helps! Frank Jandreau K1FFJ
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Re: [SoftwareControlledHamRadio] T41 weird ray traces on display
开云体育Schematic is attached…? The video buffer is an ADA4417-3ARMZ chip.? Its tiny to fit on the board so hot air soldering works best.? If this thing works, I’ll just get them pre-made with the chip pre-soldered on the board. ? There is a bit of testing to do for the right resistors to use to match the impedance between the Teensy and the driver.? I started with the sets of resistors R1-R2, R3-R4, and R5-R6 as (used as input voltage dividers and input impedance matchers) as Potentiometers… where, for example, the junction between R1 and R2 was the wiper… and the two ends became the other ends of the resistors as a convenient way to vary the inputs.? Little 1k pots work ok.? Once a good happy medium can be found, the pots can be replaced on the production boards with fixed resistors.? ? It’s a simple concept but appears to work… ? ? Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ ? Owner - Operator Big Signal Ranch – K9ZC Staunton, Illinois ? Owner – Operator Villa Grand Piton – J68HZ Soufriere, St. Lucia W.I. Rent it: ? Moderator: North American QRO Group at Groups.IO. Moderator: Amateur Radio Builders Group at Groups.IO. ? email:? bill@... ? ? From: [email protected] <[email protected]> On Behalf Of Jack, W8TEE via groups.io
Sent: Wednesday, January 8, 2025 1:36 PM To: [email protected] Subject: Re: [AmateurRadioBuilders] [SoftwareControlledHamRadio] T41 weird ray traces on display ? Bill: ? I'd like one and Al and I can use my machine as a test bed. What is the video buffer I need? If you have a schematic, could you send that to me and I'll pass along to Al, too. ? Jack, W8TEE ? On Wednesday, January 8, 2025 at 02:02:54 PM EST, K9HZ <bill@...> wrote: ? ? On this subject…? The problem is the SPI drivers in the Teensy and this has been reported in the PJRC forums as has been discussed before.? So far, the solution seems to me to place some resistors in series with the SPI control lines… but that solution is not routed in any science… but rather trial and error. ? ? About 4 months ago, I did dome research and understood that different drivers were needed between the Teensy and the SPI device (in this case, the display) for reliable operation.? I’ve seen this before… an outboard set of drivers would cure the problem… but they need to be something that doesn’t cause other problems (the V11 driver was a digital buss driver and the issue there is that… the hard off and on states cause the generation of harmonic noise that is not good for the radio).? I decided to investigate the use of some very high speed ANALOG video buffer/ driver chips (would not cause switching noise)… and I suspect they will work well and solve this problem. ? I had some little boards made that plug into the DISPLAY connector on the MAIN board (the little driver board sits right on the display connector) and the display plugs into it. See below.? I tried building one and it seemed to work well in that I was able to get several feet between the Main board and the display without any issues cropping up… but I don’t feel like I’ve had the time to really test it out properly.? I’ve attached the schematic to this note… and I will offer ANYONE in the USA one of the remaining nine boards if you will experiment with it (using the video amp I used or with any other circuitry that you find makes this work) and report to this group on your findings.? I just don’t have the time to complete it right now, and quite frankly my display works ok as it is now. ? Little boards look like this (J1 plugs into the motherboard socket – NO CABLE, while the display cable that you removed from the display connector on the MAIN board plugs into J2) : ? ? ? ? Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ ? Owner - Operator Big Signal Ranch – K9ZC Staunton, Illinois ? Owner – Operator Villa Grand Piton – J68HZ Soufriere, St. Lucia W.I. Rent it: ? Moderator: North American QRO Group at Groups.IO. Moderator: Amateur Radio Builders Group at Groups.IO. ? email:? bill@... ? ? From: [email protected] <[email protected]> On Behalf Of Frank Jandreau via groups.io ? Hello all, I've posted a few times regarding the random lines on the display. In addition, I have observed that these lines mysteriously appear for no reason. There were also other fixes posted on here. I found a post which suggested removing the display buffer IC, adding 100 ohm resistors on SCLK/SDA, and hard wiring the connections for SCLK, SDA, MIS0 and MIS1 from the main board to the display connector. I did this using four 2 conductor with shield audio cables and that has produced a rock solid solution. I've not seen lines since. I did this on my T41EP built from scratch (non 4SQRP kit). I have never seen the lines on my 4SQRP T41EP kit build. There were posts suggesting that ribbon cables were too small? and provided no shielding for these high speed signals to the display. As for the "fix" I'm not sure that the forum ever posted a definitive answer, just a lot of ideas. I hope that this helps! Frank Jandreau K1FFJ
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Re: [SoftwareControlledHamRadio] T41 weird ray traces on display
Bill: I'd like one and Al and I can use my machine as a test bed. What is the video buffer I need? If you have a schematic, could you send that to me and I'll pass along to Al, too. Jack, W8TEE
On Wednesday, January 8, 2025 at 02:02:54 PM EST, K9HZ <bill@...> wrote:
On this subject…? The problem is the SPI drivers in the Teensy and this has been reported in the PJRC forums as has been discussed before.? So far, the solution seems to me to place some resistors in series with the SPI control lines… but that solution is not routed in any science… but rather trial and error. ? ? About 4 months ago, I did dome research and understood that different drivers were needed between the Teensy and the SPI device (in this case, the display) for reliable operation.? I’ve seen this before… an outboard set of drivers would cure the problem… but they need to be something that doesn’t cause other problems (the V11 driver was a digital buss driver and the issue there is that… the hard off and on states cause the generation of harmonic noise that is not good for the radio).? I decided to investigate the use of some very high speed ANALOG video buffer/ driver chips (would not cause switching noise)… and I suspect they will work well and solve this problem. ? I had some little boards made that plug into the DISPLAY connector on the MAIN board (the little driver board sits right on the display connector) and the display plugs into it. See below.? I tried building one and it seemed to work well in that I was able to get several feet between the Main board and the display without any issues cropping up… but I don’t feel like I’ve had the time to really test it out properly.? I’ve attached the schematic to this note… and I will offer ANYONE in the USA one of the remaining nine boards if you will experiment with it (using the video amp I used or with any other circuitry that you find makes this work) and report to this group on your findings.? I just don’t have the time to complete it right now, and quite frankly my display works ok as it is now. ? Little boards look like this (J1 plugs into the motherboard socket – NO CABLE, while the display cable that you removed from the display connector on the MAIN board plugs into J2) : ? ? ? ? Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ ? Owner - Operator Big Signal Ranch – K9ZC Staunton, Illinois ? Owner – Operator Villa Grand Piton – J68HZ Soufriere, St. Lucia W.I. Rent it: ? Moderator: North American QRO Group at Groups.IO. Moderator: Amateur Radio Builders Group at Groups.IO. ? email:? bill@... ? ? From: [email protected] <[email protected]> On Behalf Of Frank Jandreau via groups.io
Sent: Wednesday, January 8, 2025 7:48 AM To: [email protected] Subject: Re: [SoftwareControlledHamRadio] T41 weird ray traces on display ? Hello all, I've posted a few times regarding the random lines on the display. In addition, I have observed that these lines mysteriously appear for no reason. There were also other fixes posted on here. I found a post which suggested removing the display buffer IC, adding 100 ohm resistors on SCLK/SDA, and hard wiring the connections for SCLK, SDA, MIS0 and MIS1 from the main board to the display connector. I did this using four 2 conductor with shield audio cables and that has produced a rock solid solution. I've not seen lines since. I did this on my T41EP built from scratch (non 4SQRP kit). I have never seen the lines on my 4SQRP T41EP kit build. There were posts suggesting that ribbon cables were too small? and provided no shielding for these high speed signals to the display. As for the "fix" I'm not sure that the forum ever posted a definitive answer, just a lot of ideas. I hope that this helps! Frank Jandreau K1FFJ -- Jack, W8TEE |
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Another Kit? The Attenuator/ dummy load.
开云体育BTW… Oliver and I will be offering a 20W dummy load kit with a 40dB attenuated RF tap that can be used for calibrating your radio basis the latest calibration documents.? It’s also good for any testing of the radio (you could leave it on one of the 4 antenna connections on the LPF permanently).? With a slightly different build (not placing some of the resistors in the kit) this will be good for is looking at your transmitted signal wave forms… and, with a tiny bit more circuitry… used for predistortion compensation that the software guys can generate code for. ? ? Another little kit that will be DIRT CHEAP. ? ? Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ ? Owner - Operator Big Signal Ranch – K9ZC Staunton, Illinois ? Owner – Operator Villa Grand Piton – J68HZ Soufriere, St. Lucia W.I. Rent it: ? Moderator: North American QRO Group at Groups.IO. Moderator: Amateur Radio Builders Group at Groups.IO. ? email:? bill@... ? ? |
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Re: [SoftwareControlledHamRadio] T41 weird ray traces on display
开云体育On this subject…? The problem is the SPI drivers in the Teensy and this has been reported in the PJRC forums as has been discussed before.? So far, the solution seems to me to place some resistors in series with the SPI control lines… but that solution is not routed in any science… but rather trial and error. ? ? About 4 months ago, I did dome research and understood that different drivers were needed between the Teensy and the SPI device (in this case, the display) for reliable operation.? I’ve seen this before… an outboard set of drivers would cure the problem… but they need to be something that doesn’t cause other problems (the V11 driver was a digital buss driver and the issue there is that… the hard off and on states cause the generation of harmonic noise that is not good for the radio).? I decided to investigate the use of some very high speed ANALOG video buffer/ driver chips (would not cause switching noise)… and I suspect they will work well and solve this problem. ? I had some little boards made that plug into the DISPLAY connector on the MAIN board (the little driver board sits right on the display connector) and the display plugs into it. See below.? I tried building one and it seemed to work well in that I was able to get several feet between the Main board and the display without any issues cropping up… but I don’t feel like I’ve had the time to really test it out properly.? I’ve attached the schematic to this note… and I will offer ANYONE in the USA one of the remaining nine boards if you will experiment with it (using the video amp I used or with any other circuitry that you find makes this work) and report to this group on your findings.? I just don’t have the time to complete it right now, and quite frankly my display works ok as it is now. ? Little boards look like this (J1 plugs into the motherboard socket – NO CABLE, while the display cable that you removed from the display connector on the MAIN board plugs into J2) : ? ? ? ? Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ ? Owner - Operator Big Signal Ranch – K9ZC Staunton, Illinois ? Owner – Operator Villa Grand Piton – J68HZ Soufriere, St. Lucia W.I. Rent it: ? Moderator: North American QRO Group at Groups.IO. Moderator: Amateur Radio Builders Group at Groups.IO. ? email:? bill@... ? ? From: [email protected] <[email protected]> On Behalf Of Frank Jandreau via groups.io
Sent: Wednesday, January 8, 2025 7:48 AM To: [email protected] Subject: Re: [SoftwareControlledHamRadio] T41 weird ray traces on display ? Hello all, I've posted a few times regarding the random lines on the display. In addition, I have observed that these lines mysteriously appear for no reason. There were also other fixes posted on here. I found a post which suggested removing the display buffer IC, adding 100 ohm resistors on SCLK/SDA, and hard wiring the connections for SCLK, SDA, MIS0 and MIS1 from the main board to the display connector. I did this using four 2 conductor with shield audio cables and that has produced a rock solid solution. I've not seen lines since. I did this on my T41EP built from scratch (non 4SQRP kit). I have never seen the lines on my 4SQRP T41EP kit build. There were posts suggesting that ribbon cables were too small? and provided no shielding for these high speed signals to the display. As for the "fix" I'm not sure that the forum ever posted a definitive answer, just a lot of ideas. I hope that this helps! Frank Jandreau K1FFJ |
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Re: Tuner interests
开云体育If you understand printed pages 587-589, you can easily build an antenna tuner for pretty much any situation… ? ? Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ ? Owner - Operator Big Signal Ranch – K9ZC Staunton, Illinois ? Owner – Operator Villa Grand Piton – J68HZ Soufriere, St. Lucia W.I. Rent it: ? Moderator: North American QRO Group at Groups.IO. Moderator: Amateur Radio Builders Group at Groups.IO. ? email:? bill@... ? ? From: [email protected] <[email protected]> On Behalf Of Anders SM0HPL / 5X7W
Sent: Wednesday, January 8, 2025 10:18 AM To: [email protected] Subject: Re: [AmateurRadioBuilders] Tuner interests ? Maybe Sabin's follow up book from 1998 with the slightly different title "HF Radio Systems & Circuits" would be of interest?? It has the chapter by Glenn R. Snider about Antenna Matching Techniques too. Only for amateur radio use... |
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Re: Tuner interests
开云体育I found my notes over Christmas from my previous ATU builds…? There are two novel things I do in my tuners that make them ultra-fast at tuning (just a few milliseconds) and a transform switch that makes the tuner work from impedances from about 2 ohms to 2500 ohms… which covers just about any antenna I can think of… ? ? Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ ? Owner - Operator Big Signal Ranch – K9ZC Staunton, Illinois ? Owner – Operator Villa Grand Piton – J68HZ Soufriere, St. Lucia W.I. Rent it: ? Moderator: North American QRO Group at Groups.IO. Moderator: Amateur Radio Builders Group at Groups.IO. ? email:? bill@... ? ? From: [email protected] <[email protected]> On Behalf Of Garry Champion via groups.io
Sent: Wednesday, January 8, 2025 4:33 AM To: [email protected] Subject: Re: [AmateurRadioBuilders] Tuner interests ? Excellent idea, I will be on the list as soon as it becomes available. Keep up the good work Dr Bill. Garry M0MGP |
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T41 weird ray traces on display
All: Today, I had been working on the code for several hours and suddenly seemingly random traces were being drawn on the display. I had seen this before about 2 years ago, but (again) I've slept since then and forgot what we did to fix it. Because I hadn't been doing anything to the hardware and the software changes were nothing special, I activated the ShowTempAndLoad() function to see if it was running hot. The call showed that the internal temperature of the CPU was about 56° (132F), which is a tad on the toasty side. I put the small fan back on the Main board and in a few minutes the temperature was down to 36°. I've been running for several hours now and no weird traces. The Main board I'm testing right now is from Justin's (AI6YM) kit and I built it prior to my changes to the assembly manual. As a result, both heat sinks on the Main board sit just to the left of the Teensy. This means the heat from the heat sinks rises when mounted in the case and gently bathes the Teensy is a stream of hot air. It would have been much smarter to mount the heat sinks on the back side of the PCB. I have no idea what this would do for the Teensy's temperature, but it surely wouldn't hurt it. If you do this, pay attention to the lead orientation for the regulators. Jack, W8TEE -- Jack, W8TEE |
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Re: E37-VT6880-1
Likely you will never hear about the knobs, from my past experiences.
The knobs for the alps controls should work but I did not check out both datasheets.
The zip file contains the source code and the alps datasheet.? The source is set up mostly with parametric variables so you could increase the size of the knob OD's and leave the shafts the same.
?
Original code from Kjell Karlsen, LA2NI [SK] in Norwegian.? Took awhile to get to this point.
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Dick K9IVB
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Re: Tuner interests
开云体育I think most people buy the book to get the software disk in the back (funny reading the comments on the book).? I posted the contents of the disk in the files section of this forum because its labeled as “PUBLIC DOMAIN”. ? ? Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ ? Owner - Operator Big Signal Ranch – K9ZC Staunton, Illinois ? Owner – Operator Villa Grand Piton – J68HZ Soufriere, St. Lucia W.I. Rent it: ? Moderator: North American QRO Group at Groups.IO. Moderator: Amateur Radio Builders Group at Groups.IO. ? email:? bill@... ? ? From: [email protected] <[email protected]> On Behalf Of Greg, KM5GT via groups.io
Sent: Tuesday, January 7, 2025 11:30 AM To: [email protected] Subject: Re: [AmateurRadioBuilders] Tuner interests ? The groups.io effect has already hit.? The least expensive copy is now $60.? Thanks folks! ;) ? ------------------------ |
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Re: Tuner interests
开云体育Thanks for this… very good reference… ? ? Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ ? Owner - Operator Big Signal Ranch – K9ZC Staunton, Illinois ? Owner – Operator Villa Grand Piton – J68HZ Soufriere, St. Lucia W.I. Rent it: ? Moderator: North American QRO Group at Groups.IO. Moderator: Amateur Radio Builders Group at Groups.IO. ? email:? bill@... ? ? From: [email protected] <[email protected]> On Behalf Of Lawrence Galea via groups.io
Sent: Tuesday, January 7, 2025 2:22 AM To: [email protected] Subject: Re: [AmateurRadioBuilders] Tuner interests ? ? On Mon, Jan 6, 2025 at 11:11?PM Rich Brandt, AE8AA via <richbrandt=[email protected]> wrote:
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K9HZ
Jack, W8TEE
Garry Champion