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The DC operating point would seem to be that of Fig 1 of the data sheet for the PSA-8A+.? But that is fine, either way.? I was hoping to get some data on noise level data of other implementations of

Ok so what's the problem then? Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ Owner - Operator Big Signal Ranch – K9ZC Staunton, Illinois Owner – Operator Villa

“this puts 30+ dB of gain right ahead of the QSD?” no no no… its operating at a voltage that provides much less gain… Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ

First, R8-R11 should NOT BE POPULATED under I2C control. U15 pins GPA0 and GPA1 should ALTERNATE STATE. NOTHING should be plugged into J1 unless it LISTENS ONLY. U3 and U7 appear to be working

*** It is. It's also one of the settings accessible by poking at the volume control knob switch. - Jerry

Why isn't this a menu item? Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ Owner - Operator Big Signal Ranch – K9ZC Staunton, Illinois Owner – Operator Villa

Folks who are having issues with PA oscillations, do you see it on the beta version of the Ver66-9 code? https://github.com/KI3P/SDTVer066-9 And if you, does it go away if you comment out this line

In my efforts to track a PA oscillation problem I noticed that in the SSB mode, the receive solid state switches (U1 & U8 on the LPF-Cntl) do not change state when the PTT is engaged but the transmit

Thank you much for the comments.? This is all most useful in understanding the operation and limitations of QSD/Tayloe receivers. I went back and spent some time with theT41 schematics.? Q: Do you

Sounds very interesting. Alas, I know nothing about FPGA, but wish I did. Jack, W8TEE

*** Yeah, there's a line you need to change in the .ino file. Inside setup_cw_transmit_mode() you will see something like: sidetone_oscillator.amplitude( 1 ); Replace it with:

Actually it didnt originally dawn on me to use the parallel bus for the display bit it makes a lot of sense to do that and dedicate a processor to it. I may take a look at that. Dr. William J. Schmidt

Jack, one version of my radio (it has been in progress for 10 years!) did use the Raspberry PI for the display. I used Python and it worked quite well. Hated the? boot time so I looked at other

I have been playing with a Genmitsu CNC....? Made the rear panel of my radio using that.... so much nicer than drilling even with my drill press.? Learning curve was big even after knowing and using

Thanks Oliver.? I recognize this from the sketch.? I use the test code to check the LPF out and let yall' know. The filters alone are working great. Thanks again. Mark KU3O

My CW side tone is very loud, the volume setting in the CW menu does not have any affect. I am using V12 boards and running Ver 50.2. Any ideas on what to look for? Paul M. KC2TVJ

There seems to be several failures at the LPF associated with the last software release. Maybe just coincidental ? Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ Owner -

The sketch that aids in testing the LPF is here: https://github.com/DRWJSCHMIDT/T41/tree/main/T41_V012_Files/T41_V012_Software/T41_V12_Software_For_Board_Testing/K9HZ_LPF_tester I don't recall there

I think my LPF is acting up.? I'm using 66.4.? I built it a while ago and tested it with the LPF testing software, worked great.? But I seem to remember a detailed checklist to be used with the SW