On Fri, May 23, 2025 at 06:20 AM, Albert Peter wrote:

I will have to have a look. I did revise some of the fitlter designs in the last version.

I tracked down a problem I was having in SSB transmit to the size of the decimate state vectors, FIR_dec3_EX_I_state, FIR_dec3_EX_Q_state.? If these are allocated to DMAMEM, the RF out on the RF board at times exhibits a raised skirt in both side bands.??I'm a novice in filter design and use, but it appears the FIR_dec3_EX_I_state and FIR_dec3_EX_Q_state are too small. ?Properly sized this doesn't happen.? The FIR_int3_EX_I_state and FIR_int3_EX_Q_state vectors appear to be too big, but this isn't a problem, except more memory is used.?

?

How to reproduce:

Lynn, KU7Q, is using this in his CTR2-Dial Product. It's intended for use with remote operating apps that supports MIDI commands. It works great with Marcus Roskosch's Apple products apps.

Ken
? The suggestions from Jerry are good but they're not a permanent fix. The
files in /tmp are exactly that: temporary. They will be recreated as and when
needed the next time you boot the system.
? The problem probably lies in a configuration file buried deep in the darkest
depths of /etc, where whatever creates these files gets its config from.
? You're probably better of searching for similar problems on the Ubuntu forums
rather than here (and my apologies if anyone here does have an answer).

? Some people consider this DANGEROUS but I would try running the command as root to see if it makes any difference. But you do so at your own risk.

? And a hint for those not used to using the Linux terminal and command line:
Use "tab" completion to make entering commands, file names etc easier.
So instead of typing the whole of the
? "sudo ls -l /tmpo/.mount_arduinIn8mwB/chrome-sandbox" command just do
? ?sudo ls -l /tmp/.mo<tab key>
If it does nothing then either:
? it's got more than 1 possible completion so give it 2 <tabs> and it will
? ? show you the possibilities OR
?
? It looks to me like the last six characters in .mount_arduinIn8mwB are
randomly generated each time you run the command, so the above hint should
make life easier.

Regards
Keith G0GNL

Strange, both of my builds V10 and V12 have always received excellent audio reports. I have used several cheap (RS) elements in home made enclosures.

Did you use the dedicated Mic ground?

Tim W4YN

?

On Fri, May 23, 2025 at 06:16 AM, Albert Peter wrote:

I will remove the CW messenger, but if you would send a screen shot of the T41 port, I will include that.

Screenshot of the code?? The code is available on my GitHub in the file .? It's over 500 lines so I'm not sure if a screenshot is useful.? Perhaps a scroll box?

?

Or do you mean a photo of the radio in that mode.? There's not much to that photo (see below) but if you can handle a video, I can send a short clip demonstrating the memory keyer and keyboard entry (just a CQ with my call sign).

?

dave

I will have to have a look. I did revise some of the fitlter designs in the last version.

Al

The design stuff would be a whole page on its own. I may add that over time. I would have to do it with a lot of context added so it makes sense.

Good idea.

al

Thanks,

Terrance.

I will remove the CW messenger, but if you would send a screen shot of the T41 port, I will include that.

Regards,

Al

Site is looking amazing.

?

Thank you Jack and Al.

?

Regards
Phil VK2KKZ

Al

?

You've put together a great site.? Thanks.? I especially like the performance pages.? Any design details that didn't make it into the book would also be helpful from a historical perspective.

?

A note on the Gallery photos.? In the sixth row, first image, you've included a photo of my build of the CW Messenger, a project from your and Jack's Microcontroller project book.? No problem including the photo, but it's not T41 related.? In fact, I ported a version of that software into my T41 so my CW Mesenger now sits mostly idle.

Hi Dave.? I assume you're interested in FT8 with WSJT on your PC. I know several folks have done data modes with their PC and T41 connected in various ways.? Some modes can be done without modifying the T41 software.? V66-9 does have a CAT control module but I am not familiar with it.? Others, including me, have added CAT control to their v11 software.

?

I've done a few things with FT8 specifically.? I've added an FT8 decoder to my T41.? It's not readily ported to the main code base as it requires some work to free up the needed memory.? With my current software, the Teensy only has 12k of heap left in FT8 mode, though saving memory hasn't been a focus of mine for some time and I've added a bunch of stuff that could still be optimized somewhat.? Full FT8 solely within the T41 might be possible but would require a lot more work?

?

I've also tried FT8 with WSJT with audio over USB from the T41 to PC.? I got it sort of working, but as discussed in this post, it really requires a patch to the Audio library to work correctly.? I haven't tried that yet, but I think others have.

?

?

The T41 Information site is live at and we are getting a lot of traffic. So far, just since yesterday at noon, we have gotten over 400 visits and more than 1200 page views.

I just added a new photo gallery of images gleaned from this site and other places. If you want to have your rig featured on the User page, send me a photo and short paragraph describing your experience.

Send to

Thanks,

Al