[Elecraft] K1 Audio Problem after fitting KNB1 Noise Blanker

[Don Wilhelm]

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

On 1/10/2012 12:46 PM, Ray Spreadbury wrote:
> Hi All
>
> I've just completed the Noise Blanker to retrofit into existing my 4-band
> K1, # 3020.
>
> Part of the installation is to remove C22 from the K1 RF Board&  fit the
> female 8 pin connector at J1 which seemed to go OK.
>
> I then fitted the KNB1 to the K1&  went through the initial tests. There was
> immediately a fairly strong audio whine on all frequencies, all bands but
> there were no error messages&  the menu for the NB (Off/Hi/Lo) worked with
> no problem.
>
> The whine is present with/without an antenna connected and after removing
> the NB board, the whine is now still present. CW signals can be tuned in
> fine so the problem appears to be just in the audio.
>
> Ant ideas please guys?
>
> 73
>
> Ray, G3XLG
>