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Re: T41 SDT Code Issues

 

Jack
?
You might be able to recover some of your data using a different operating system to look at the drive. If you can create a Linux system which will boot off a USB stick it will look at any drives on the system. If it can see your drive then that's a good start.
?
Alternatively if you have a Linux system you could plug your drive into it if there is a spare SATA port. On one occasion I recovered a friend's music collection this way. It was on a Windows boot drive on a laptop which was dropped. The screen shattered. I was able to see the drive on a separate Linux system and recover the media files.
?
Hope you get it sorted.
?
Jim
Re: CAT with Audio Working. Sort of. Almost.

 

There is an I2S bus running at 192ksps.? That drives the audio DAC (and also the ADC).? I'm referring to V11 software, V12 could be different, but probably not.
?
Now in the audio data stream (Process.cpp) the audio is interpolated up to 192ksps before driving the output.? So you could tap in at some point before the interpolation
and it might work better.? Experiments could be easily tried.
?
Anyhow, the Open Audio library can re-sample to 44.1ksps, and then you can drive a USB output object.? In theory anyway, I haven't tried that.? You should get clean audio.
I went through this same process recently, it looked to be more trouble that it was worth because 48ksps is not in the audio library, and I bailed out to a lazy man's (practical) hardware solution.
I think we need to nicely ask Paul to get other sample rates added to the audio library.
?
It is also interesting that the original convolution receiver project could change sample rates.? T41EEE is now running the transmitter at 48ksps, and also the receiver at 48ksps (receiver during calibration only).
A future version of T41EEE will have more flexible sample rates for both transmitter and receiver.? This will simplify the zoom and hopefully get power consumption reduced (low power battery mode).
?
--
73 Greg KF5N
Re: CAT

 

It's an experimental platform, and it would make an interesting experiment:

S/PDIF
The I2S port may be used to receive and transmit S/PDIF. The S/PDIF is independent of both I2S/TDM ports and can be used simultaneously. Either or both of the I2S ports may also be used to transmit S/PDIF.
It's a hack because it corrupts the official and very thoroughly tested TeensyDuino package.? Now if you have trouble with something, and you go ask for assistance, and you say "oh, by the way I've changed a bunch of files",
you may not get good service.? And then every time the package is updated, you have to go and re-certify your changes.? For me, doing this as a fun hobby, that's over the line of what I want to do.? Just my own individual perspective
as a retired person working on amateur radio stuff for fun.
?
Now if we could present these changes and ask them to be incorporated into the official and supported release, that would be great!? I would switch to USB audio in a heartbeat.
?
--
73 Greg KF5N
Re: CAT

 

¿ªÔÆÌåÓý

I am not sure I would call the changes to the Audio library a Hack, but each to his own.

At least it does not require any hardware changes and a SPDIF interface on the PC.

Also it would mean the interrupt lines from the MCP23017 front panel would have to be moved as they use 14 and 15 which the SPDIF uses.

-- John G0ORX

On 2/22/25 16:39, Greg KF5N via groups.io wrote:

Hi John, the Teensy already supports, without hacks, 192k audio via the SPDIF port.
I built a prototype Main board with SPDIF and it works.? So that's an alternative that bypasses hackage of the TeensyDuino package.
I took the SPDIF port out of the released T41-2 Main board, but I may put it back in the next version.
?
--
73 Greg KF5N
CAT with Audio Working. Sort of. Almost.

 

So I have the two serial ports AND the audio device working. HOWEVER, the audio received by the PC is
garbled. I think there is a sample rate mismatch. Are we running the Teensy audio library at a high rate? Even for audio output?

- Jerry, KF6VB
Re: RF Board MAR-3SM+ biasing current

 

¿ªÔÆÌåÓý

I have not had a look at that yet.

?

?

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 John G0SDF via groups.io
Sent: Saturday, February 22, 2025 6:07 AM
To: [email protected]
Subject: [SoftwareControlledHamRadio] RF Board MAR-3SM+ biasing current

?

Just a thought. The MAR-3SM+ Amp used for the CW transmission was biased at fairly close to the recommended current of 35mA. But now that R73 is added across C73 this has resulted in a reduced biasing current of nominally 17mA. I have changed R56 from the 1k8 to a 2k7 to bring the biasing back to just under 35mA.
Re: CAT

 

Hi John, the Teensy already supports, without hacks, 192k audio via the SPDIF port.
I built a prototype Main board with SPDIF and it works.? So that's an alternative that bypasses hackage of the TeensyDuino package.
I took the SPDIF port out of the released T41-2 Main board, but I may put it back in the next version.
?
--
73 Greg KF5N
Re: T41 SDT Code Issues

 

On 2025-02-21 09:39, K9HZ wrote:

* Use specialized woven IDC cable (spoiler alert: very expensive if
you can find it) where every other line is a GND line.
*** Not that much. Just a few bucks for an 8inch 10-conductor length. Digikey has 275
short ones for $1.48 apiece. 3M brand: 1700/10.

But the system has to be designed for it. IDC connector with all grounds on one side. I imagine it
would help with crosstalk, but I also think it would increase the capacitance to ground of each signal.

- Jerry, KF6VB
Re: CAT

 

¿ªÔÆÌåÓý

Just catching up with all the T41 emails over the last couple of months.? Take a look at:

This supports 2 serial ports over USB and 192K USB Audio. I tested it some time ago and it works well.

-- John

On 2/22/25 15:35, Greg KF5N via groups.io wrote:

That's good, and it proves it is possible.? But that list of changes is really long!? In my opinion, support for that in the T41 will not go smoothly.
Hopefully that capability can be added to TeensyArduino in a future version.? It should be!
?
Meanwhile in T41EEE, I will add capability (very minimal software) to support a cheap USB codec.? This will get the job done for easy usage of WSJTX.
I've already tested this and it works very well.? And no library hacks are required!
?
--
73 Greg KF5N
Re: CAT

 

That's good, and it proves it is possible.? But that list of changes is really long!? In my opinion, support for that in the T41 will not go smoothly.
Hopefully that capability can be added to TeensyArduino in a future version.? It should be!
?
Meanwhile in T41EEE, I will add capability (very minimal software) to support a cheap USB codec.? This will get the job done for easy usage of WSJTX.
I've already tested this and it works very well.? And no library hacks are required!
?
--
73 Greg KF5N
RF Board MAR-3SM+ biasing current

 

Just a thought. The MAR-3SM+ Amp used for the CW transmission was biased at fairly close to the recommended current of 35mA. But now that R73 is added across C73 this has resulted in a reduced biasing current of nominally 17mA. I have changed R56 from the 1k8 to a 2k7 to bring the biasing back to just under 35mA.
Re: T41 SDT Code Issues

 

My Ver 11 build had 6-7 inch display cable 3.3 volt too, never a glitch.
Ver 12 had glitches and freeze ups with any code I used until I slipped some ferrite sleeves over display and front panel ribbon cables.?
Have not had a freeze or glitch except with the long pins on Teensy not making contact.
If I wiggle and hold left pinky in air just right it will run fine for days until I wiggle something again.?
Have ordered some quality long pin female headers and a spare Teensy to see if that clears up issues.
Back to winding coils, LPF done and 2 BPF bands done lots more of the little buggers to go.
Guys TNX for all the work you put into this build!
Tim W4YN
Re: T41 SDT Code Issues

 

On 2025-02-21 11:54, jjpurdum via groups.io wrote:
I will give it a try. At this point, I would put salt on a swallow's
tail if I thought that would work. I did back up my personal photos,
but not my past tax records.
You can always request past tax returns from the IRS. Although -
maybe not now. I hear they're a little short-handed.

- Jerry, KF6VB
Re: CAT

 

Jerry,?
You might also want to look into the Wiki, particularly the section on USB Audio:
?
And there is also the Keithsdr discussion group, where Mike is active:
--

73, Joerg - DB2OO
Re: Excessive Noise

 

¿ªÔÆÌåÓý

It¡¯s definitely either the PCM5102 or the PCM1808, or the circuitry around those parts (I¡¯ll bet you have a solder bridge or a bad part)¡­ and remember that could be at those parts or at the Teensy processor (or hat)¡­

?

?

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: Friday, February 21, 2025 2:37 PM
To: [email protected]
Subject: Re: [SoftwareControlledHamRadio] Excessive Noise

?

Thanks Bill.? I have done this with the RF board disconnected and the audio hat off and I get the same result. I'll try reinstalling the A/D and DACs but in the mean time, can I buy a set??

Thanks for the advice.

Mark
Re: Excessive Noise

 

Thanks Bill.? I have done this with the RF board disconnected and the audio hat off and I get the same result. I'll try reinstalling the A/D and DACs but in the mean time, can I buy a set??
Thanks for the advice.
Mark
Re: T41 SDT Code Issues

 

On Fri, Feb 21, 2025 at 09:06 AM, jjpurdum wrote:
What would be the cause of the display issues when some of us have ribbon connectors to the display that are 4-5" long?
I've pondered this question as well.? My 4SQRP kit T41 has an 8-9" cable between the display and main board.? Besides a few glitches early on, which I think were software related, my display has worked well for about a year.
Re: RF Board

 

Yes, thanks for sending...



On Friday, February 21, 2025 at 01:24:05 PM EST, K9HZ <bill@...> wrote:


Jack.. .you said you want a new V12 RF board?

?

?

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@...

?

?


--
Jack, W8TEE
Re: T41 SDT Code Issues

 

I'll ask him, but I don't think he does. I have an infrared "gun" that I might poke around with. I'm gonna try the freezer thing too.

Jack, W8TEE

On Friday, February 21, 2025 at 01:43:06 PM EST, jerry-KF6VB <jerry@...> wrote:


On 2025-02-21 09:47, jjpurdum via groups.io wrote:
> I have the C boot drive which is a SSD, but only 500G, my D drive,
> which holds everything and is 1 TB and the drive that died, and drive
> F which is a 2T hot-swap backup drive. D no longer shows up in Windows
> Explore or the Disk Manager. I'm hoping it's a faulty/dirty connector

*** Does Al have a infrared camera?? I saw a video where somebody fixed
a dead SSD by imaging it - and quickly finding a shorted electrolytic.
The shorted electrolytic got hot, and the camera saw it.

I've been looking at such things, because I have a nice mini-pc
that died.? It's pulling down the power supply and the power supply
light is blinking.? I tested the supply on the bench, and it delivers
its rated current, no problem.

Whatever's loading down that supply is surely heating up.

There are approximately a zillion of these things on Amazon.? The
main feature I'm looking for is "macro" - the ability to focus on
something really close - like a circuit board.

? ? ? ? ? ? ? ? - Jerry, KF6VB



> which I will check when I tear the system down later today. If that
> doesn't work, how long in the fridge? If that fails, I'll go over to
> Al's and put it in an old system he has and see if that controller can
> find it. If that doesn't work, I've lost a tremendous amount of
> non-T41 stuff and I'll start shopping for a large pile of kindling and
> a very flammable Viking ship.
>
> Jack, W8TEE
>
>? On Friday, February 21, 2025 at 12:18:23 PM EST, jerry-KF6VB
> <jerry@...> wrote:
>
> On 2025-02-21 06:47, jjpurdum via groups.io wrote:
>
>> Also, I have other distractions now. At some time yesterday my main
>> data drive died
>
> *** That sucks.? Did it die completely, or just lose data?? Sometimes
> they
> can be read by putting the drive in the fridge.
>
>? I have a unique system.? I don't keep anything important on my
> desktop
> PC.? Instead, I have a Linux server running the Samba suite that acts
> as
> a
> windows fileserver.? I actually have three of those servers;? two
> active, and
> the third being upgraded to a newer Linux.? Also, I do an encrypted
> incremental
> backup to the cloud once a week.? The server in use backs itself up to
>
> the second hot server every night.
>
>? So far, I've been lucky.? Have had some close calls, but never lost
> it
> all.
> My email queue goes back to 1989!? Back then I didn't have real
> Internet.? My PC
> ran a program called "UUPC" that dialed up another computer and
> transferred mail and
> netnews via the UUCP protocol.? I had it on a 24 hour timer.? In the
> middle of the night,
> it would come on for a few hours.? UUPC was in the autoexec.bat.
>
>? ? ? ? ? ? ? ? ? - Jerry, KF6VB
>
> --
> Jack, W8TEE
>
>
> Links:
> ------
> [1] /g/SoftwareControlledHamRadio/message/32850
> [2] /mt/111306866/243852
> [3] /g/SoftwareControlledHamRadio/post
> [4] /g/SoftwareControlledHamRadio/editsub/243852
> [5]
> /g/SoftwareControlledHamRadio/leave/10484476/243852/1943518115/xyzzy






--
Jack, W8TEE
Re: T41 SDT Code Issues

 

I will give it a try. At this point, I would put salt on a swallow's tail if I thought that would work. I did back up my personal photos, but not my past tax records. I also had about 8 months work on a "How-To" book and I never back any of it up. Stupid...just plain stupid.

I'll let you know if it worked.

Jack, W8TEE

On Friday, February 21, 2025 at 01:49:37 PM EST, Larry - AC8YE via groups.io <ac8ye@...> wrote:


Jack,

Put the failed drive in a zip lock bag, then that in another zip .lock bag.? I usually put the double bagged drive in the freezer for at least 24 hours.? Once you take it out of the freezer, you have about 45 minutes to reconnect the drive and try to recover your data.? This has worked for me over the past 35 years.

Larry - AC8YE

Sent with secure email.

On Friday, February 21st, 2025 at 12:47 PM, jjpurdum via groups.io <jjpurdum@...> wrote:

I have the C boot drive which is a SSD, but only 500G, my D drive, which holds everything and is 1 TB and the drive that died, and drive F which is a 2T hot-swap backup drive. D no longer shows up in Windows Explore or the Disk Manager. I'm hoping it's a faulty/dirty connector which I will check when I tear the system down later today. If that doesn't work, how long in the fridge? If that fails, I'll go over to Al's and put it in an old system he has and see if that controller can find it. If that doesn't work, I've lost a tremendous amount of non-T41 stuff and I'll start shopping for a large pile of kindling and a very flammable Viking ship.

Jack, W8TEE

On Friday, February 21, 2025 at 12:18:23 PM EST, jerry-KF6VB <jerry@...> wrote:


On 2025-02-21 06:47, jjpurdum via groups.io wrote:

> Also, I have other distractions now. At some time yesterday my main
> data drive died

*** That sucks.? Did it die completely, or just lose data?? Sometimes
they
can be read by putting the drive in the fridge.

? I have a unique system.? I don't keep anything important on my desktop
PC.? Instead, I have a Linux server running the Samba suite that acts as
a
windows fileserver.? I actually have three of those servers;? two
active, and
the third being upgraded to a newer Linux.? Also, I do an encrypted
incremental
backup to the cloud once a week.? The server in use backs itself up to
the second hot server every night.

? So far, I've been lucky.? Have had some close calls, but never lost it
all.
My email queue goes back to 1989!? Back then I didn't have real
Internet.? My PC
ran a program called "UUPC" that dialed up another computer and
transferred mail and
netnews via the UUCP protocol.? I had it on a 24 hour timer.? In the
middle of the night,
it would come on for a few hours.? UUPC was in the autoexec.bat.

? ? ? ? ? ? ? ? ? - Jerry, KF6VB






--
Jack, W8TEE


--
Jack, W8TEE
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