problem on the pin 40 of my RPi4

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F1FCO
Posts: 8
Joined: Sat May 05, 2012 12:10 pm

problem on the pin 40 of my RPi4

Post by F1FCO » Mon Mar 11, 2024 4:23 pm

hello everyone,
I use an RPi4 on my PORTSDOWN transceiver
in rx pin 40 is at 2.42 V !!!
and goes to 3.34 in position tx
the problem is that this pin 40 is not at 0 in rx

I can't use it to switch an amplification chain

Do you have an idea ? or another pin to use ?
F1FCO, Pierre, southern France
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