Re: Noisy K-3 Receiver

Posted by Leigh L. Klotz Jr WA5ZNU on Dec 17, 2009; 11:34pm
URL: http://elecraft.85.s1.nabble.com/Noisy-K-3-Receiver-tp4173832p4184188.html

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