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Mine is oscillating too. But only with the later software. - Jerry

Schematic and BOM on the GITHUB Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ Owner - Operator Big Signal Ranch – K9ZC Staunton, Illinois Owner – Operator Villa Grand

I completed my RF board last fall based upon the BOM "T41_RF_Board_BOM_V012.6_02-25-24.xlsx".? My RF board seems to work OK although "how well" is still a question.? I have not followed properly the

Today, I checked v50.2 and v66.4 after putting my T41's back together. ? Both versions have a 33-45MHz oscillation at the higher bands.? I have pretty low isolation PA Out to PA In at those

This should have arrived sometime today… Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ Owner - Operator Big Signal Ranch – K9ZC Staunton, Illinois Owner – Operator

Another way to test this is to disconnect the display altogether.? This can't be done with the existing software as the code will hang trying to start the RA8875 object.? However, in developing the

This is an edited version of the report to exhibit the effect on isolation of moving some tracks off of the LPF-Control board. Tomorrow, I will put the amplifier back in the circuit I have had an

Switching RX to TX Sel BPF (and back) is required for proper operation. Needs to be figured out in the code… Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ Owner -

For displays? Mostly MIPI DSI. It's a high speed serial standard.? This is what Raspberry Pi displays use.? The ones connected by flat cables,? not the HDMI. MIPI is also used for camera data. But

I've continued looking at isolation as it relates to a PA oscillation at ~33MHz on the higher bands when the PTT is engaged. Below is the first page of my attached report. I have time to test any

I kind-of got to the same point by other methods. The remedy was to ground all floating points on the display and build a box out of pcb on the back side, shielding the radio from the display (metal

I replaced the large clamp on with 2 slim ones and put one on each end. Hardly notice they are there. Tim

Great! I was hoping someone else would try it as a check on what I did.

Ok good to this point. Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ Owner - Operator Big Signal Ranch – K9ZC Staunton, Illinois Owner – Operator Villa Grand Piton -

I sent out 5 of the driver boards before i left to test candidates who said they would try them. If they work, ill mass sell them… if not, back to the drawing board (but i have more ideas). Dr.

Ok. I am currently at my contest station in the Caribbean (J62K) getting ready for WPX with some youngsters early in their contesting careers. Ill ne back home on April 4th and ill get your order out

Thank you for sharing your work John! That is a quick and easy method for finding EMI sources -- I think I'll try to do the same with my radio.

A clam-on ferrite did work for the shorter ribbon cable in the image I posted earlier.? It wouldn't work for a somewhat longer cable.

I believe the ferrite sleeves made for the ribbon cable solved all my issues. Tim W4YN

T41EEE.9 is here: https://github.com/Greg-R/T41EEE The README has all of the details.? This firmware is for the V10/V11 and T41-2 series platforms only. There were a lot of changes!? There will be