[Elecraft] [K3]Advice needed from audio grounding experts

[Dave G4AON]

Hello Paul

I took the pre-wired cable that came with my PTC-IIex and terminated the
cable in a plastic project box, I connected all 4 of the braid of the
screened leads to/from the K3 to the braid of the cable to the SCS
modem. The white wire (pin 2 of the DIN plug) on the cable from the
modem also connects to the braid at that common point.

You might at some stage consider making a switch box to avoid needing to
keep swapping those audio plugs when using sound card modes, a cheap 4
pole 3 way rotary switch works well, just needs a few sockets on the
rear panel of a small box and you're in business. It saves wear and tear
on the rear sockets of the K3.

73 Dave, G4AON
K3/100, SCS PTC-IIex
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>I am making up a cable set to connect a Pactor modem to the K3 and wish to
>avoid ground loops. The connections to the radio are: