[Elecraft] K3 VFO tuning noise

Pete Smith N4ZR n4zr at contesting.com
Tue Dec 18 16:35:45 EST 2012


What about hearing tuning noise in the main RX when the sub-RX is 
tuned?  In my case it is not discrete signals, rather an increase in the 
noise, and is clearly audible over band noise on 10.

73, Pete N4ZR
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On 12/18/2012 3:53 PM, Jussi Eloranta wrote:
> On 12/18/2012 12:11 PM, Bill Clarke wrote:
>> So - I got curious and tested my rig for the "noise" on ten meters. 
>> It is so faint that I had to use phones to be sure it was actually 
>> there. I agree with Phil, this will never bother me. Perhaps this 
>> varies from one rig to another?
> On mine I can definitely hear it even with the band noise present (I 
> always use phones and work with fairly weak signals lurking in the 
> noise).
> When browsing the band quickly, it is possible to miss a weak station 
> because of this. I have a "decent" antenna hooked up to it - an 
> inverted V, which
> is abt 50 feet up from the center, so there is significant band noise 
> present. I have the preamp on pretty much at all times on 10m.
>
> I wonder if there are some factors in the assembly process that could 
> affect this (routing of cables etc.) ?
> I think I have also noticed that the amplitude of the tuning noise 
> varies (not related to the noise level of the band) but
> I still have to verify this observation (this could still be my 
> imagination).
>
> As for the question about the RF gain - I probably need to calibrate 
> RF gain again. It would be great to know
> how it got messed up - it could have been from the very beginning - I 
> might have just missed it.
>
> Jussi (AA6KJ)
>
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