[Elecraft] Weird EMI issue... part deux

[N2TK]

I had the encoder noise problem on 6M. It happened when I had upgraded the
software (don't remember the version). I reloaded the software and the
problem went away. It has been fine since.
N2TK, Tony 

-----Original Message-----
From: elecraft-bounces at mailman.qth.net
[mailto:elecraft-bounces at mailman.qth.net] On Behalf Of James Sarte
Sent: Saturday, February 28, 2009 11:37 PM
To: 'Gregg'
Cc: elecraft at mailman.qth.net
Subject: Re: [Elecraft] Weird EMI issue... part deux

Hello Gregg,

If these are indeed pulses generated by the encoders, would replacing them
solve the issue, or is this a design problem?

Could this noise be masked out in firmware, or is it a hardware issue that
can't be solved via software?

I do recall hearing about some people having similar problems with their
rigs on 6 meters.  In my case, 6m is quiet with no EMI noise.  

What's troubling me now is that some people say this is normal, while others
like the good folk over at Elecraft tech support cannot replicate this issue
on their K3's.

73,
James KC2UEE


-----Original Message-----
From: Gregg [mailto:w6izt at bellsouth.net] 
Sent: Saturday, February 28, 2009 5:55 PM
To: 'James Sarte'
Subject: RE: [Elecraft] Weird EMI issue... part deux

James:

I suspect that what you are hearing is an artifact of the pulses generated
by the tuning encoder. These pulses are audible on some K3s on 6 meters. The
fact that they are not as loud with the pre-amp on is most likely due to an
increase in the noise floor when the pre-amp is activated that somewhat
masks the pulses.

Gregg
W6IZT

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