[Elecraft] Noisy K-3 Receiver

[Mike]

Any idea what serial number the upgrade started shipping with? Or a way 
to determine if I have it already?

Thanks,
Mike NF4L

Lyle Johnson wrote:
>> There is an often referred to AF filter module which installs on the 
>> main DSP board ...
>>     
>
> My understanding is that this is part of the DSP board swap upgrade,  
> and is in currently shipping K3s.
>
> But I've been known to be wrong!
>
> 73,
>
> Lyle KK7P
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