[Elecraft] KX3: nearby noise post-mortem

[Bill K9YEQ]

Check your light bulbs, especially if using CFL or LED.  I have had both emitting bad noise.  Shutting them off rid my whole station of the issue.

Bill
K9YEQ
-----Original Message-----
From: elecraft-bounces at mailman.qth.net [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Nicklas Johnson
Sent: Sunday, February 9, 2014 10:11 PM
To: mzilmer at roadrunner.com; elecraft
Subject: Re: [Elecraft] KX3: nearby noise post-mortem

I should have mentioned this specifically, but I was operating the KX3 strictly from batteries at the time.

Connecting a 13.8V source to it (one that was plugged into the house power) didn't really change whether the 'buzz' was present or not.

​The only thing that changed it was either unplugging the offending power supply, or de-energizing that circuit in the house (by tripping the breaker).​

​I guess it's not impossible that the thing was putting off a lot more energy than I thought, and I was picking up a lot of common-mode noise on the cable shield-- a lot more than I thought I would/should.​

​Good ideas though.​

​   Nick
​
On 9 February 2014 20:05, Matt Zilmer <mzilmer at roadrunner.com> wrote:

> Hi Nick,
>
> After reading your reply, I think I have an idea.
>
> I've had the same problem in a mobile setting, where good grounds are 
> scarce and there is a lot of transient noise around.  If -somehow- the 
> noise put off by the charger were to get onto the 12V line into the 
> KX3, you might get this effect.  I don't see how this could happen 
> though.
>

--
*N6OL*
Saying something doesn't make it true.  Belief in something doesn't make it real. And if you have to lie to support a position, that position is not worth supporting.
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