Well, I did some more troubleshooting and this is what I found:
I stuck some troubleshooting code at the beginning (first line) of loop().? Draw a line on the display.? Well, looked like setup never exited.? Stuck that code in various places in .ino and eventually found that swrSetup() was hanging up.? I have the SWR_AD7991 installed but not the transformer (shorted RF In to RFOut). I commented #define V12_LPF_SWR_AD7991 out.? Then I commented out swrSetup() and 66.9 ran!
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Looks like it's not in the latest code on github (KI3P/SDTVer066-9) that was updated 2 weeks ago. ?
I've shut down my radio and brought it back up and all is good.
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Still a little noisy on 40M but 20M seems to be working great.
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While I'm at it, when should the BPF_TX and _RX be in or out?? I attached a test cable to the LPF ACC Control connector and those signals are different moving from 66.4 to 66.9.? In 66.4, BPF_RX was out in SSB mode and in when in CW mode.? In 66.9, it appears that BPF_RX is "in" in both modes.?
Thanks
Mark KU3O
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Re: Oscillations on high bands
Yeah you can short C14 and C16 but C15 needs to be a 0.1uf¡?? I¡¯ll fix that on the Carrier board for the PIN DIODE TR switch¡ ? ? Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ ? Owner - Operator Big Signal Ranch ¨C K9ZC Staunton, Illinois ? Owner ¨C Operator Villa Grand Piton ¨C 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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From: [email protected] <[email protected]> On Behalf Of D Solt via groups.io
Sent: Wednesday, April 2, 2025 1:28 PM
To: [email protected]
Subject: Re: [SoftwareControlledHamRadio] Oscillations on high bands? I solved my oscillation problem.? I did not populate the 1.8MHz HPF.? I placed shorts across the capacitors forgetting that the MASWSS0179TR RF Switch needs DC blocks.? I now have >65 dB isolation across the frequency range. I am running version 66.9.
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Re: T41 Transmit Calibration V12
When doing the TX IQ calibration of the higher bands that use USB, do you null the lower image?
dave, n3ds
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Re: Oscillations on high bands
I solved my oscillation problem.? I did not populate the 1.8MHz HPF.? I placed shorts across the capacitors forgetting that the MASWSS0179TR RF Switch needs DC blocks.? I now have >65 dB isolation across the frequency range.
I am running version 66.9.
dave, n3ds
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You have the compensation cap in place on the primary of T3? ? ? Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ ? Owner - Operator Big Signal Ranch ¨C K9ZC Staunton, Illinois ? Owner ¨C Operator Villa Grand Piton ¨C 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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From: [email protected] <[email protected]> On Behalf Of Tim via groups.io
Sent: Monday, March 31, 2025 2:06 PM
To: [email protected]
Subject: [SoftwareControlledHamRadio] More testing on PA? I have Dr. Bills PA and a similar (same finals) from 60dbm shop. Both on 13V same 0dB sweep from SA. I attached the 60dBm Schematic for reference. Here is Dr. Bills with 0dB in
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Tnx Henning
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SA was not overdriven, I did the 60dBM plot first and did not want to change anything.
The low bands were 12W so exceeded scale. SA had a lot of headroom left, I had 40dB attenuator in line from PA to SA.
You were quick to? see that shows you know your instrumentation well.
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Tim W4YN?
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Although I didn't know Mike well he took the time one day to spend several hours on AnyDesk probing my Mac trying to resolve an issue with how WSJT-X interfaced with my Icom IC-7851. Mike was a fellow veteran and we spoke about our experiences while we worked. He shared his medical issues with me and I understood his concerns about his future but that didn't stop him from helping folks almost right up until the time he became a Silent Key. Most of us will never know how much he did for the hobby with his work mostly in the background. Thanks Mike and RIP.
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VR,
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Dino KL0S
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Re: boards and kits and stuff
Did you find it?
Dr.?William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ ? Owner - Operator Big Signal Ranch ¨C K9ZC Staunton, Illinois ? Owner ¨C Operator Villa Grand Piton - J68HZ Soufriere, St. Lucia W.I. Rent it: www.VillaGrandPiton.com
email:??bill@... ?
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On Mar 30, 2025, at 8:46?PM, Glenn via groups.io <glennp@...> wrote:
? Bill Is there a. Link to sch etc for this little board.? I don't have any issues with my build and a 6inch cable but then again, not checked the? higher bands. Glenn?
'72 ISUZU BELLETT SPORT Sent from my Samsung Galaxy S21 FE Smartphone.
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Even if you don't know who Mike is, you know his work.? Mike was a key developer of hamlib in addition to many, many other contributions to our hobby.? I only had the privilege of a few email exchanges with him but you would be hard pressed to find a kinder, more helpful ham anywhere.
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https://dukerandhaugh.com/obituaries/michael-d-black/
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Tim,
You plot shows some overdriving at low frequencies of either the Pa or the SA. So either increease the reference level to +20 dBm, or use a 10 dB attenautor at the SA?s input or lower the output of the TG by at least 10 dB.
Henning Weddig DK5LV
Am 31.03.2025 um 21:06 schrieb Tim via groups.io:
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I have Dr. Bills PA and a similar (same finals) from 60dbm shop. Both on 13V same 0dB sweep from SA. I attached the 60dBm Schematic for reference.
Here is Dr. Bills with 0dB in
His with -10dB in,
60dbm shop amp 0dBin
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to be honest, I would have expected to know which mistake was the cause. It might be helpful for others. mistakes are meant to be learned. If no mistakes are?
made, there is nothing to learn. Again, please share your experience. Mistakes are not shameful.
History teaches us that mistakes have always led to progress. Scientists who didn?t share their ideas and mistakes have been forgotten.
From a distance it is always difficult to find mistakes, which makes honest feedback all the more important.
I hope I?m not offensive
best regards
Ralph
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Re: boards and kits and stuff
Thanks Oliver for the link
glenn
vk3pe
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The scans checks for the presence of an I2C device at all valid addresses -- if it finds a device at a particular address, it prints a notification to tell you so and continues searching. As you connect more boards to the bus you'll see the scanner find more devices.
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I belive it is working. When the I2C Scan starts it finds the audio? hat and then scans a few seconds later and come back on devices found.? Is this correct on how the I2C Scan works, finds one address and looks for another??
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Tom
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Re: 4SQRP T41 Assembled/Tested Radio for sale
I have received an offer to buy the T41 from K0ESE. I'll mark this as "Funds Pending".
Thanks and 73,
Frank K1FFJ
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I have Dr. Bills PA and a similar (same finals) from 60dbm shop. Both on 13V same 0dB sweep from SA. I attached the 60dBm Schematic for reference.
Here is Dr. Bills with 0dB in
His with -10dB in,
60dbm shop amp 0dBin
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On 2025-03-31 06:30, jjpurdum via groups.io wrote: That's one thing Hans does right: He doesn't release stuff until he's
convinced it's bullet-proof. *** Yup. That being said, the QMX+ is back on the shelf, and I'm back to playing with the T41. Despite being a kit, the QMX is essentially an appliance - from my point of view. Because it's closed source. For me, its entertainment value is limited. Hans has promised some sort of built-in language interpreter, and I might go back to it when that's a reality. - Jerry, KF6VB Jack, W8TEE
On Sunday, March 30, 2025 at 09:30:34 PM EDT, jerry-KF6VB
<jerry@...> wrote:
On 2025-03-30 15:50, Greg KF5N via groups.io wrote:
Did you get a chance to look at the spectrum?
That seems like a lot of power for BS170s! *** It's a digital PA. In the schematic, the BS170's are fed
RF by LOGIC gates. I think it's what's called a "class E".
They don't even have heat sinks. They output 5W without
breaking a sweat.
The spectrum looks good on my FTDX10. I haven't hooked it up to
a spectrum analyzer yet.
- Jerry, KF6VB
--
73 Greg KF5N
Links:
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[1] /g/SoftwareControlledHamRadio/message/33305
[2] /mt/111990371/243852
[3] /g/SoftwareControlledHamRadio/post
[4] /g/SoftwareControlledHamRadio/editsub/243852
[5]
/g/SoftwareControlledHamRadio/leave/10484476/243852/1943518115/xyzzy
--
Jack, W8TEE
Links:
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[1] /g/SoftwareControlledHamRadio/message/33311
[2] /mt/111990371/243852
[3] /g/SoftwareControlledHamRadio/post
[4] /g/SoftwareControlledHamRadio/editsub/243852
[5]
/g/SoftwareControlledHamRadio/leave/10484476/243852/1943518115/xyzzy
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Re: 4SQRP T41 Assembled/Tested Radio for sale
Sorry forgot the photo:
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4SQRP T41 Assembled/Tested Radio for sale
Hello everyone,
I have an assembled, tested and calibrated a T41 from 4SQRP that I built as a comparison to my T41EP that I built from scratch (no kit). I wanted to see if my no kit T41 performed as well as the kit from 4SQRP (which it did!). My T41 for sale has the "built like a tank" 20 watt amplifier from K9HZ. The last firmware that I installed is T41EEE by KF6VB. Of course newer versions of firmware/software have been released which you could upgrade the T41 to. The T41 is excess to my needs and I am hoping that someone who wanted this design but missed the one-time production run from 4SQRP may be interested in buying this completed radio. Please contact me directly if interested via PM or email me to the email listed on QRZ.com.
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Thanks and 73,
Frank K1FFJ
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K9HZ
