[Elecraft] RX IQ USB Noise

[Andrew Hebden]

Hi,
This sounds like a 'hum loop' problem, the scourge of audio enthusiasts. 
In effect there are two earth connections between the KX3 and PC and it
forms a small loop aerial where by it picks up mains interference. You could
try running the cables from the KX3 to the PC very close together.
It doesn't affect most people but I did get this problem a bit ago, but not
with my KX3. The solution for me was to fit two small audio isolation
transformers (one for each channel) in the IQ line, fitted in a small
project box, and the problem went away. This has long been the recommended
procedure for most audio lines between a PC and a rig.

Hope this helps.
Andrew
G8BYB

-----Original Message-----
From: Elecraft [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Enzo
Adrian-Reyes
Sent: 31 August 2016 08:43
To: Elecraft List
Subject: [Elecraft] RX IQ USB Noise

HI all

Me again, I have a problem with my setup and trying to work out what is
wrong. I have a  handy video, which shows my problem:
https://www.youtube.com/watch?v=hZPYUVpqefI

I hope somebody knows how to fix this, I've tried different USB hubs,
different laptops even.
I havent tried a different sound card though but then again I don't want to
keep throwing money at a problem unless there is a less expensive way to fix
this.

Regards

VK3FRAD
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft at mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html Message
delivered to andrew at ahebden.com


---
This email has been checked for viruses by Avast antivirus software.
https://www.avast.com/antivirus