[Elecraft] Recommended filters for Diversity Receive?

[Bill]

I use two 8 pole at 1.8Khz with the DSP set for 2.1.  I like the way it
sounds and works.
Bill
K9YEQ

-----Original Message-----


John W2ID:

You do realize that these are roofing filters and that operating bw is set
by the DSP?  Of course if you are operating in a dense high signal
environment (lots of QRM on adjacent freq) then having a roofing filter that
matches your operating bw is helpful.

I have both main and sub Rx but only use a duplicate of my SSB filter
(2.8-KHz 8-pole) in my sub receiver.  I initially bought a 13-KHz filter for
the sub-Rx not realizing it was not going to be used for diversity on FM so
I sold it soon after purchase.  I have 13-KHz because I use my K3/10 with
VHF/UHF transverters operating FM.  I do no AM but can use that filter for
AM.  I also bought a 400-Hz filter thinking it would help receiving CW, and
it does (almost too good). 
But having more noise suppression in the narrower bw does help weak CW copy
(since I only use CW for eme).

Adding more filters to the sub-Rx is not as difficult as to the main-Rx.
The sub-Rx has to be removed to add/remove or change filters in the main-Rx.
So try to get the arrangement in the main-Rx before installing the sub-Rx.

But for casual CW listening I usually dial DSP bw to 1.0 KHz for easier
listening.

I only run diversity mode for running 2m eme using digital mode of JT65b
using MAP65 sw which enables dual receive of two receivers.

But like the KX2,  both K3 and K3s do not provide IQ interface, so I tap off
the 1st IF of both receivers to go to two SDR which are phase-locked in
frequency so that diversity info is preserved at the soundcard.  Because I
tap off the 8.2 MHz IF's the signal does not go thru the roofing filters or
the DSP in the K3.  The K3 merely acts as a tunable down converter from
28-MHz which what my transverters input at.

I know this has little to offer in your decision on filters to install.  I
kept it simple (one SSB filter in my  sub-Rx).


73, Ed - KL7UW
http://www.kl7uw.com
     "Kits made by KL7UW"
Dubus Mag business:
     dubususa at gmail.com

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