[Elecraft] K3 serial cable shielding / noise question

[M1PAF]

G4ILO wrote:
> 
> Do you get this noise if you connect an audio cable between the computer
> and the K3? This would help decide whether the noise is coming from the
> computer itself (e.g. poorly suppressed power supply) being coupled to the
> radio via the shield, or if it is being generated by the serial adapter in
> the PC.
> 
I'll try that. What makes me think it's the serial port is that connecting
the serial cable doesn't increase the noise level, it's only when the
computer is polling the radio (i.e. traffic over the cable). I've already
addressed general computer hash and that's down to an inaudible level. I'm
sure it's a screening issue and could be down to the quality of the screen
on the cable I'm using.

Cheers,
Paul M1PAF
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