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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

In Ontario, unbuilt kit. ?make an offer.

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

Hi Adam Thanks - yes I understand that. But I can’t figure out why it isn’t 1/2 vcc. I’ve desoldered the clock module in case that was the problem, but it wasn’t. — Rich Atkinson

Hi Rich, If A2 pin is normal, it should be high impedance since it is an input pin, so the A2 voltage should be 1/2 VCC or 2.5V. Thanks, Adam 在 2024/8/31 8:15, atkinsonr via groups.io 写道:

Hi Adam R18 is indeed 1k, but I measure 0v at the A2 pin with the LPF installed, and 1.6v with the LPF removed. I'm not sure what to look for next. Rich

Hi Rich, If R18 is actually 1k and it is actually connected to 5V, I suspect your 2nd Nano has a dead A2 pin already. Thanks, Adam 在 2024/8/30 18:16, atkinsonr via groups.io 写道:

Thanks Bernd and Adam for your help with this. The photo is helpful, thank you. I belive my LPF is correct and have attached a photo. Some measurements: With the LPF off the mainboard, I measure 1kΩ

Hello Rich Adam is with me, I'll add a picture of the finished LPF for 40m Important is the resistor at the right position (C7) no coil L1 and no C3. The black stuff is Plasti Dip so that the coils

Thanks - that helps... I see that R18 should be 1k in series with the 1k on the LFP. Will investigate.

I have about 5v at R18

If so, you can measure about 2.5V at R18. Thanks, Adam

I have about 11.2v AC between 12v and GND pins on the LPF. 73, Rich

Confirmed. 1k resistor on this one. LPF board is populated according to this schema: /g/crkits/files/ADX-S/V2/Schematic_ADX-S%20V2%20and%20BAND%20FILTER_2024-07-13.pdf

Hi Rich, Please confirm you are looking at the V2 manual and the LPF module has a resistor on it. Thanks, Adam

Hello I'm new to amateur radio and this is my first radio build. I have assembled the main board and the 40m LPF, but all 5 LEDs remain lit with the LPF board installed. What have I tried? At first I

Yes, I can see the page and the info is very helpful!? Thanks. Ron

Can you see this page? https://mp.weixin./s/4OXpr45TLUHp3HHikpA5Gw Thanks, Adam

Adam, Thanks for the pixie diagram with the changes for 20 meters.? With these values, the AADE filter analysis program shows the filter notch around 35 MHz instead of at the second harmonic (28

Pixie2023 7025&7030 is the choice. If you cannot order directly on my web store, please let me know offline. Thanks, Adam 在 2024/8/19 8:23, Adam Rong via groups.io 写道: