[Elecraft] K3 serial cable shielding / noise question

[Greg - AB7R]

Paul,

Anytime I have seen strange problems with serial cables they've been caused by 
homebrew cables.  Please see if you have an OEM straight through cable (not a null 
modem cable) and see if that helps.  Also make sure the jack screws are well 
secured to the K3 to maintain a good solid connection.

-------------------------
73,
Greg - AB7R
Whidbey Island WA
NA-065
K3#0009 and 0319

On Thu Mar 20  2:39 , M1PAF  sent:

>
>Hi list,
>
>Bit of a strange issue here with serial comms between the PC and the K3.
>First a bit of description about my set up: I use an external noise sense
>antenna in addition to the main station antenna to cancel out some nasty
>local electrical noise with a Timewave ANC-4 noise phasing unit. This is
>connected to the RX out / RX in jacks on the transverter interface (this is
>a great feature).
>
>The issue I have is this: when I use a USB serial adapter I get no
>additional noise issues when the computer is polling the rig. However, my
>computer has a serial port which I would rather use. I made up a cable with
>pins 2, 3, 4, 5, and 6 straight through and the cable shield soldered to the
>shell of the d-type that connects to the K3. When I use this cable the radio
>picks up bursts of noise from the noise sense antenna (which is not good if
>I'm using it to null out other local noise).
>
>This is obviously radiation from the serial cable but I'm at a loss as to
>why (incidentally also tried some ferrites on the cable and they made no
>difference).
>
>Any suggestions?
>
>Thanks Paul M1PAF
>
>-- 
>View this message in context: http://www.nabble.com/K3-serial-cable-shielding---
noise-question-tp16175101p16175101.html
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>
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