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Ver066_9_3_22_25

 

Hey yall',
I was running Ver66.9 and it seemed to address some of the issues I was having.? Calibrated FREQ and REC I/Q.? All good through several shutdowns and startups. Shut my radio down and brought it back up and now there is no spectrum, waterfall, audio.? Keypad and encoders don't work.? BIT passes.? For a while the SWR 7991 wasn't being picked up (failed), resoldered it and it still failed.? Then, on one restart, it magically passed. ?I reformatted the SD card, no luck. ?Re-extracted the .zip, recompiled and reloaded, no luck.? Weird! Thought MAIN may have failed, but I loaded Ver66.4 and that worked.?
Has anyone seen this?? SWR 7991 commented out.? RF 23017 is at 0x22, not 0x27.
Argh!
Thanks
Mark
 

Oh, build results:
Memory Usage on Teensy 4.1:
? FLASH: code:305956, data:129336, headers:9116 ? free for files:7682056
? ?RAM1: variables:191584, code:283272, padding:11640 ? free for local variables:37792
? ?RAM2: variables:483744 ?free for malloc/new:40544
?
600MHz, dual serial, Faster with LTO
 

I've made dozens of changes to the 66.9 .ino, sdt.h and config.h files which entailed multiple compiling and loading cycles.
?
I want to say that this is the most stable and easy-to-live with release thus far.
?
Thank you?
 

That is strange. This sounds like the kind of error that can happen when the data structures stored on the EEPROM change, for instance when you move between versions of the code without erasing the EEPROM. But, by your description, you didn't do that.
 

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!
?
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.
?
Still a little noisy on 40M but 20M seems to be working great.
?
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
?
 

Bill can comment further, but the BPF should be in the signal path in both RX and TX mode.?

In TX mode it cleans up the signal before it goes to the PA. This means that higher-order harmonics of the signal produced by the exciter -- copies of the signal at multiples of the transmit signal -- are filtered out and not amplified by the PA. These would be removed by the LPF anyway before they could hit the antenna, but removing them before the PA helps with signal quality because the PA isn't having to amplify signals at multiple bands simultaneously.

In RX mode the BPF keeps the other bands away from the input to the mixer. If you didn't have the BPF in place you would expect to get a higher noise level in the audio at best, and distortion from strong signals in other bands at worst.


On Wednesday, April 2nd, 2025 at 3:54 PM, epif18 via groups.io <epif18@...> wrote:

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!
?
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.
?
Still a little noisy on 40M but 20M seems to be working great.
?
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
?
 

¿ªÔÆÌåÓý

Yeah exactly right¡­ everyone is use to having a BPF in transmit to clean up the signal before transmitting¡­.

?

But what many SDRs are missing is a preselector¡­ a band filter mechanism in receive that only allows the band you are listening through (Hence two BPFs for dual receive¡­ because you could be on different bands).? And because SDRs (and particularly this SRD that can operate from about 400kc up to almost 150 mhz), receiving a very loud signal pretty much anywhere in its receive range can desensitize the front end/ mixer to the point that you hear nothing!? We fixed that with the BPF in the T41 operating in Receive too¡­.

?

So when at Field Day operating with friends on different bands¡­ you won¡¯t see any interference in the receiver from them.

?

That¡¯s the reason we used a 5 pole filter¡­the skirts are very sharp so all the trash outside of the TX and RX frequency is greatly attenuated.

?

?

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@...

?

?

From: [email protected] <[email protected]> On Behalf Of Oliver KI3P via groups.io
Sent: Wednesday, April 2, 2025 4:09 PM
To: [email protected]
Subject: Re: [SoftwareControlledHamRadio] Ver066_9_3_22_25

?

Bill can comment further, but the BPF should be in the signal path in both RX and TX mode.?

?

In TX mode it cleans up the signal before it goes to the PA. This means that higher-order harmonics of the signal produced by the exciter -- copies of the signal at multiples of the transmit signal -- are filtered out and not amplified by the PA. These would be removed by the LPF anyway before they could hit the antenna, but removing them before the PA helps with signal quality because the PA isn't having to amplify signals at multiple bands simultaneously.

?

In RX mode the BPF keeps the other bands away from the input to the mixer. If you didn't have the BPF in place you would expect to get a higher noise level in the audio at best, and distortion from strong signals in other bands at worst.

?

?

On Wednesday, April 2nd, 2025 at 3:54 PM, epif18 via groups.io <epif18@...> wrote:

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!

?

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.

?

Still a little noisy on 40M but 20M seems to be working great.

?

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

?

?
 

Hi Oliver, you're generally right, but missing one important detail.? The harmonic copies coming out of the QSE circuitry will mix with the fundamental in the power amplifier
and produce intermodulation products (adjacent channel splatter) right along side the fundamental.? At that point, that junk can't be filtered out.? The LPF won't help.
The math of the problem kind of catches you off guard.? The harmonic energy is offset from exact harmonics, due to the modulator.? I was able to simulate this.? We were all surprised when we saw this phenomenon
in the early days of the T41.
?
So a bandpass (or lowpass) between QSE output and PA input keeps that energy out of the PA and there is no opportunity for generation of those adjacent channel intermodulation products.
?
--
73 Greg KF5N
 

¿ªÔÆÌåÓý

May be a bad cable or on the wrong cable (remember¡­ there is WINE, WIRE1, and WIRE2¡­. Three channels for the I2C comms so you gotta be on the right cable.? See the development document on the github about the I2C assignments).

?

?

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@...

?

?

From: [email protected] <[email protected]> On Behalf Of epif18 via groups.io
Sent: Tuesday, March 25, 2025 10:15 AM
To: [email protected]
Subject: [SoftwareControlledHamRadio] Ver066_9_3_22_25

?

Hey yall',

I was running Ver66.9 and it seemed to address some of the issues I was having.? Calibrated FREQ and REC I/Q.? All good through several shutdowns and startups. Shut my radio down and brought it back up and now there is no spectrum, waterfall, audio.? Keypad and encoders don't work.? BIT passes.? For a while the SWR 7991 wasn't being picked up (failed), resoldered it and it still failed.? Then, on one restart, it magically passed. ?I reformatted the SD card, no luck. ?Re-extracted the .zip, recompiled and reloaded, no luck.? Weird! Thought MAIN may have failed, but I loaded Ver66.4 and that worked.?

Has anyone seen this?? SWR 7991 commented out.? RF 23017 is at 0x22, not 0x27.

Argh!

Thanks

Mark

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