[Elecraft] KX3 Filter Blow-By

[Wayne Burdick]

Hi Jim,

This is most likely related to opposite sideband suppression, not  
filter blow-by. Nominal factory calibration results in OSB suppression  
of around 55-60 dB. You can improve on this using a new procedure we  
developed a month or so ago. It requires a strong signal source on  
each band to be optimized. I can send you the firmware and  
instructions if you're interested.

73,
Wayne
N6KR

On Oct 8, 2012, at 10:46 AM, Jimk8mr at aol.com wrote:

> A recent KX3 owner (# 1677), I've noticed hearing out of passband   
> signals
> from loud CW stations. I can hear such stations up to several KHz   
> away. I
> suspect the range is limited by the audio response of the system,   
> including
> my ears. Both sides of zero beat, though less so on the opposite  
> side  of
> the zero beat.
>
> In the CA QSO Party this weekend, maybe the loudest 10% of the  
> stations on
> 10 CW Saturday afternoon were leaking through. (I've heard the  
> leakage on
> other  bands as well.)
>
> I don't have any roofing filters. (I figured any stations weak  
> enough  for
> me to need the filter to hear, would never be able to hear me anyway).
>
> Is this normal, or is there some shielding or other issue affecting my
> unit? (It is a kit version).
>
>
> 73  -  Jim  K8MR
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