Re: ADX-S V2 build - please help!
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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.
¡ª Rich Atkinson
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
ÔÚ 2024/9/1 9:15, Rich Atkinson via
дµÀ:
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.
¡ª
Rich Atkinson
+61 425 261 410
[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
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