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... and the receiver doesn't come on like it does if there's no display cable installed ...

I just made a 20' cable. It works fine for the front panel buttons, but when I install it for the display the screen doesn't come on. Is that useful information, or did everyone expect that?

Hi Terrance- The original V11 Main board design uses a driver IC for the SPI bus which drives the display.? Same for the original kits.? No one complained about display issues that I can recall.

Routing has already been optimized… with the 4-layer board. Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ Owner - Operator Big Signal Ranch – K9ZC Staunton,

Plugs DIRECTLY into the display connector on the MAIN board and sits OVER the MAIN BOARD like the picture below: Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ Owner

I'll try mine out with a very long cable as well. Regarding future Main board designs, has routing the SPI traces to minimize crosstalk been considered?

In your case, try out a LONG cable… say 3 feet and see if that works. If it does, I’ll start mass-producing them… and possibly get Oliver to place the circuitry on a V12.7 main board for future

Bill, My system is working and without freeze-ups, but I will try out your board. Al

I believe that this is the "correct" solution.

I have both M and C parts, but it doesn’t seem to make a difference. If there is a software fix for this, I really wonder why someone hasn’t done it. There are posts all over the PRJC site about

I hope you got the M version.? The C version is only specified to 25 MHz. Also, remember there is a potential software solution to boost the Teensy drivers. That will require drilling into the device

I use these ferrite sleeves for ribbon cables. Seems to work FB. Tim W4YN

Another wacky, but successful solution is to hand wire the display with the SPI signals separated by the ground/power lines.? I used the following order successfully on an 8.5" cable: 1. SCLK (gray)

Well, the ISO7241 is a specially designed SPI buss buffer/ isolator/ driver chip…, it plugs into the T41 display socket on the main board (close to the Teensy) and the display cable plugs into it.

Hi Bill- Is your board placed at the display end?? It seems like it is more of a "buffer board" rather than a driver board, if so. I'm trying to visualize why it works. -- 73 Greg KF5N

The driver board seems to extend that to 6 feet (I can only measure the effect on a scope, not with the display)… someone else will give me the real story. Dr. William J. Schmidt - K9HZ J68HZ 8P6HK

I've continued my T41 v12 display experiments.? A 9mm clamp-on ferrite worked with my 5.5" ribbon cable. It didn't work with the 11" or 15" cables I had on hand to test.? So somewhere between 6" and

I have a 5V display.

Ok expect it. Is you display set up for 5V or for 3V? Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ Owner - Operator Big Signal Ranch – K9ZC Staunton, Illinois

Sure, I'll test one.? Thanks!