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Hi Rich,

ATU is not recommended. A dummy load is good enough to do the TX test. If ATU is not well tuned, it will return high RF voltage, and it is the possible reason to mess up the MCU code. Please make sure your C25 near R18 is well connected to A2 pin, as it is a protection.

Thanks,

Adam

在 2024/9/1 10:17, Rich Atkinson via 写道:

Hi Adam

Yes, by clock module I mean the purple board.

Reflashing the nano made it work again, I was able to TX twice, then it started misbehaving again (and presumably needs reprogramming again). Do you know why this would be?

PS: I can't see any visible reason why A2 and R18 weren't properly connected, I expect it is my soldering rather than a defect in the board.

—

Rich Atkinson

On Sun, 1 Sept 2024 at 11:40, Adam Rong via <rongxh=[email protected]> wrote:

Hi Rich,

Good to know the LPF detection fix. Is it a PCB trace crack or something similar?

What is the clock module, you mean the whole purple board or just the green TCXOM module?

Can you re-program the Nano to check if it works again?

Thanks,

Adam

在 2024/9/1 9:15, Rich Atkinson via 写道:

Good morning Bernd

Thank you very much for the handholding.

I found that the high resistance (about 4 Mohm) was between the A2 pin and the nearest side of R18. I reflowed the solder through these joints, but it didn't make any difference - so I bridged them using a piece of resistor leg - that fixed it. The Ardunio now recognises the LPF board!

I resoldered the clock module to the main board, and now it seems to behave unpredictably.

I pressed the TX button while connected to a dummy load via an ATU, and saw 3.3 watts of output. However, the next time I pressed TX - the TX LED didn't light and there was no TX power.

I power cycled the board, and saw a fast-flashing TX LED.

Power-cycled again. This time, instead of the band 1 LED, the band 2 and 4 LEDs were lit.

Power-cycle again, Bands 1,2 and 3 were lit.

Power-cycle again, Band 1 lights correctly - but the switches don't do anything.

I appreciate that this is a good quality kit, and I'm a poor electronics engineer, and once again your guidance is very much appreciated.

PS: It wasn't a typo - I thought that the LPF would have AC across it, my mistake - it's about 2.5 VDC.

—

Rich Atkinson

+61 425 261 410

On Sat, 31 Aug 2024 at 17:52, Bernd DL3BLA via <b.langner=[email protected]> wrote:

[Edited Message Follows]

Hello Rich
Why don't you make a simple resistance measurement without
voltage. To do this, remove the Arduino LPF plugged. Then measure against ground at A2 should be ~1Kohm, then ground against 5V Arduino
should be ~ 2Kohm.
If the values are correct, the board is ok and R18 and the resistor on the LPF are correctly mounted.

If the values are ok we have to look further?

?

Rich wrote: I have about 11.2v AC between 12v and GND pins on the LPF.

Rich you have to measure in the DC range or was that a typo

?

Bernd