Re: CAT with Audio Working. Sort of. Almost.
OK, we're apparently running it at 192kHz. This is supported by the PCM5102 DAC device.
Right now, I am looking through USB specs to figure out how to have the radio
tell the PC that it's 192ksp. In the "Digital Audio Interface Properties" screen, there is a dropdown menu "Select the sample rate and bit depth to be used when running in shared mode". But it's grayed out. This tells me that Windows
should at least be capable of using other bitrates than the standard 44.1ksp.
I found an audio spec on usb.org:
Using Wireshark, I was able to find the exact USB packet where the radio tells
the PC (erroneously) that the sample rate is 44100 samples per second.
AND I found it in the USB teensycore.
Gonna change it now, see what happens.
- Jerry, KF6VB
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On 2025-02-22 08:56, jerry-KF6VB wrote: 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
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You might be able to do that with a Windows machine.? You can get a USB to SATA adapter (plus power supply if required).
So you plug the damaged drive into the adapter,? USB into the working Windows machine, and a drive appears.
If the damage is only in the OS, then the data will be intact.? But it has been a long time since I tried that with Windows.? That route may not work with the latest and greatest Windows OS.
Anyhow those adapters are a great thing to have.? I use one for backing up to external drives.
?
--
73 Greg KF5N
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err...Linux system...
Jack, W8TEE
On Saturday, February 22, 2025 at 02:01:59 PM EST, jjpurdum via groups.io <jjpurdum@...> wrote:
Thanks, Jim. So far, nothing has worked, but I still have a few to go. Al has a Linus system so I'll give your idea a shot, too.
Thanks!!
Jack, W8TEE
On Saturday, February 22, 2025 at 01:59:00 PM EST, Jim/G4EQX via groups.io <gts53@...> wrote:
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
--
Jack, W8TEE
-- Jack, W8TEE
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Thanks, Jim. So far, nothing has worked, but I still have a few to go. Al has a Linus system so I'll give your idea a shot, too.
Thanks!!
Jack, W8TEE
On Saturday, February 22, 2025 at 01:59:00 PM EST, Jim/G4EQX via groups.io <gts53@...> wrote:
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
-- Jack, W8TEE
|
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
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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
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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:
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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
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@... ? ?
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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.
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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
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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
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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:
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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
|
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.
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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
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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
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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
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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@... ? ?
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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??
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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
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jjpurdum
K9HZ