[Elecraft] [K3] Noisy K-3 Receiver

[Leigh L. Klotz Jr WA5ZNU]

KK7P 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
> 

The on-list descriptions of K3DSPUPGD say it changes a few capacitors and
other components to extend frequency response for TX and RX (in combination
with firmware) below 300 Hz, but has no effect on the line in/line out jacks
used by digimode programs.  Is that still the description?  

In other words, is this change mostly for ESSB and high-quality audio needs,
or is there some other advantage that might come about now our in the future
from having this board?  (Presumably with a KRX3 you need two of these and
that gets a little pricey for something with uncertain benefit.)

Leigh/WA5ZNU


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