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Since its a SWAG… explain why it happens with V69 of the software but not with V50. Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ Owner - Operator Big Signal Ranch –

So that would be a reason for the isolation to degrade versus increasing frequency. Because the module has common ground inductances on the input and output. Just a SWAG here, it's hard to tell

Yes

This switch is a plug-in module? -- 73 Greg KF5N

It is here: https://github.com/DRWJSCHMIDT/K9HZ/blob/main/K9HZ_LPF_Module/K9HZ_LPF_V1.00_Schematic_PDFs/K9HZ_LPF-Carrier_Relay_Board_Schematic_V1.00_07-25-24_KiCad.pdf

Hi Oliver, where is the schematic of the TR switch? I would like to see the circuit topology.? A few decades ago(!) I was designing TR switches and I'm curious about this one. -- 73 Greg KF5N

By comparing your final plot (Isolation PA Out to PA In, LPF Cntl SN1, 25 MHz SSB, ver 50.0) to the plot of the same configuration with oscillating software loaded (Isolation PA Out to PA In, LPF Cntl

Did that. #ifdef'd them all out. Then commented them out for good measure. I commented out the actual definition in SDT.h, and let the compiler find all the occurrences for me. Also excised the

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Years ago I worked for Niles Audio, and we produced a product that used plug in cards on a short bus.? The interconnect was via SPI between AVR ATmega128 and ATmega32 processors.? The bus had a

Working with the Version 66.9 T41 software. This particular weirdness affects nobody but me.... I use four unused i/o bits to control my homebrew linear amplifier. They tell the amplifier what band

I ran some isolation tests today. Below is the first page of my report (attached). I have had an oscillation at ~35MHz in the K9HZ 20-watt power amp in my T41 V12 (SW ver 66.4) when I press PTT in the

*** A main board bolted to the back of the display would get that cable length effectively to zero. We could use the parallel interface. Wonder if it's faster than SPI? OTOH, that would marry us to

*** You are not alone. I recently built a little gadget for my Elecraft K2 to let it control my linear amplifier. The radio has a connector on the back for the internal "aux bus" with which all the

Well the lesson i get from this category of devices is that mounting the processor on the display board is preferred. But thinking about it, all of my commercial have the processors mounted within an

It would be interesting to know what consumer devices like smartphones and tablets are using. -- 73 Greg KF5N

This may be sacrilegious, but I've been using the UART ports for a long time as the comm interface between all the processors in my radio. You even could set it up as 485 multi-drop. I mainly use

I need to investigate how some of the commercial radios are doing this. They habe experts that have spent their entire careers on just display ops so ots good to learn from them. Dr. William J.

Of course there are lots of questions, and also misunderstanding of the limitations of SPI at the PJRC forums. SPI never had a standard, but it is considered a "de facto" standard.? It was originally

Any oscillations on 10M or 6M? 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