Re: K1 Audio Problem after fitting KNB1 Noise Blanker

Posted by Ray G3XLG on Jan 10, 2012; 9:52pm
URL: http://elecraft.85.s1.nabble.com/K1-Audio-Problem-after-fitting-KNB1-Noise-Blanker-tp7172988p7173986.html

Hi Don
The "whine" is a steady continuous tone (perhaps at 800 or 900 cycles), not
popping, nor a low pitched oscillation and in fact I wondered if the
sidetone spot was on or if the key was down.
It does vary in level with the AF gain control but doesn't change in pitch.
It is present whether there is a signal being received or not. It is still
present if I do a tune.

73
Ray G3XLG

-----Original Message-----
From: Don Wilhelm [mailto:[hidden email]]
Sent: 10 January 2012 20:35
To: Ray Spreadbury
Cc: [hidden email]
Subject: Re: [Elecraft] K1 Audio Problem after fitting KNB1 Noise Blanker

Ray,

Please describe the "whine" in more detail.  Is it more of a "popping"
noise, or is it a low ptched oscillation, or is it a high pitched
squeal, or something else.
Does it vary with the AF gain control or is it more constant - if it
varies, does it change in level, or pitch or both?
Does it vary when tuning through a strong signal - how about a weak one,
or is it present whether there is a signal being received or not.

If you do a TUNE (connect a dummy load first), is it silenced or is it
still present.

73,
Don W3FPR



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