[Elecraft] KX3 Filter Blow-By

[Bill W4ZV]

What is the OSB suppression after calibration using this procedure?

73,  Bill  W4ZV


wayne burdick wrote
> 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@

>  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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