[Elecraft] K3 serial cable shielding / noise question

[Thomas Norff]

Hi Paul,

i do have the same issue from the beginning.
Only connected to the computer makes no problems.
But as soon as the computer starts with data transfer you can hear that.

Disconnecting the interface stopped that 'noise'.
In addition the normal signal gets louder. Which could be the AGC...

What i haven't tried is to separate the usb/rs232 interface from the trx
with an additional cable.
Maybe the internal signals are what we notice ?

73 de Thomas, DM7TN

-----Original Message-----
From: elecraft-bounces at mailman.qth.net
[mailto:elecraft-bounces at mailman.qth.net] On Behalf Of M1PAF
Sent: Thursday, March 20, 2008 2:06 PM
To: elecraft at mailman.qth.net
Subject: Re: [Elecraft] K3 serial cable shielding / noise question



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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