Brian,
Tie the signal returns (ground) for for the K2 to other Elecraft gear to
pin 1.
Note that pin 5 is only the signal return (ground) in the RS-232 (PC)
portion of the cable (K2 and PC ends)
For the W1 to PC cable, the signal return is pin 5, just as in the K2 to
PC case.
I have not looked at the SignaLink schematics (they are not convenient
and on-line), so you are on your own there. I thought the SignaLink to
PC connection was USB in any case. Certainly the audio cables can be
made from twisted pair - it does not have to be shielded in most cases,
the twist does most of the extraneous signal rejection.
73,
Don W3FPR
On 9/19/2011 5:12 PM, Brian - N5BCN wrote:
> Hi All,
>
> I've taken Jim Brown and Don's advise and constructed a K2 to PC control
> cable using Shielded Cat 6 ethernet cable. The shield is tied to the DB9
> shell on both ends of the cable, signal returns using the "striped wire" of
> each pair tied to pin 5.
>
> The cable appears to be a success: RFI problems are much improved!
>
> Now I'd like to construct similar control cables for other gear in the
> shack:
> 1) The cable from the K2 to a remoted KPA100
> 2) The cable from the W1 to the PC
> 3) Cable from a SignaLink to the PC and K2
> 4) etc
>
> Many of the above cables do not seem to have a "return" line and/or do not
> use Pin 5. Assuming I'm still tying the shield to the DB9 shell, where
> should I tie the "striped wires" of each pair to?
>
>
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