[Elecraft] K3 Goes to TX on Turn ON

[Alan]

Paul,

If the K3's "PTT-KEY" menu selection is set to something other than 
"OFF-OFF" then the K3 uses the RS-232's RTS or DTR pins as a keying input.

The P3 has no internal connection to those pins.  It just passes them 
straight through between the "PC" and the "XCVR" connectors.

Do you have an RS-232 cable connected between the P3 and a PC?  If so, 
then no doubt the PC is asserting RTS or DTR.  Either that, or the cable 
is bad.

Three possible solutions:

- Figure out why the PC is asserting RTS or DTR and change it.
- Change the K3 "PTT-KEY" menu entry to "OFF-OFF".
- Remove the RS-232 cable between the P3 and the PC.

Alan N1AL


On 10/24/2014 07:59 AM, paul ecker via Elecraft wrote:
> Have a problem that just cropped up last night. When I turn on my K3, the red TX light immediately goes on. After connecting and disconnecting all external connections to K3, I determined the culprit was the RS-232 cable to the P3. If I disconnect the cable problem goes away, red TX light goes out. I tried swapping  RS-232 cables but same problem exists. Any ideas where to look on this ?? The P3 and K3 have been co-existing fine til last night.
>
> Tnx & 73 Paul
> kc2nyu
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