I had a similar problem last year when setting up my KX3 which came from a silent key with accesory bits missing. I used a an old USB to RS232 adaptor, sourced locally which turned out not to be running at proper RS232 voltage levels but closer to TTL.
Different devices are more or less tolerant of variations in voltage levels. Without a ‘scope it is hard to check the voltages, so substituting with another borrowed known good lead might be a good way to go.
I am still missing the Morse Key and Hand Microphone which can’t be found :-(
John G7LTQ
> From: Bill Frantz <
[hidden email]>
> Subject: [Elecraft] PX3 computer interface to KX3
> Date: 27 April 2018 at 01:40:53 BST
> To:
[hidden email]
>
>
> I'm sitting in New Hampshire and I find I can't get my computer to talk to the KX3 when it goes through the PX3 using the ACC1-PC jack. The computer can talk to the KX3 when plugged in directly to ACC1 jack on the KX3, and the PX3 can get the frequency data when plugged into the same jack.
>
> I have the same problem with both wsjt-x and RUMlogNG, so I don't think the problem is in the computer software. The USB <--> RS232 seems to be working, so I suspect the PX3.
>
> Does anyone have any suggestions for something to fix to get both the computer and the PX3 to talk to the KX3? (I'm low on test equipment here, but I do have a DVM.)
>
> Thanks - Bill AE6JV
>
> -----------------------------------------------------------------------
> Bill Frantz
John N
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