[Elecraft] K3 Filters for the 2nd receiver?

[Don Wilhelm]

Mike,

To transmit FM you will need the FM filter in the main receiver (it will 
also be used for transmit).
I would suggest that you re-examine your filters in the main receiver.  
If you will not operate digital modes, you can likely do without the 200 
Hz filter.  If the 200 Hz filter must stay, then I would suggest you 
eliminate the 1000 Hz filter unless you are a CW contest type that likes 
to listen with a wide receiver - during normal operating, your 1.8 kHz 
filter in conjunction with the DSP filtering should work just fine.  
OTOH, if you do not operate a lot of sideband contests, the 1.8 kHz 
filte could go and the 1000 Hz can stay.

These are only my suggestions, choose your filters to match your 
operating preferences.  The DSP will handle reduced bandwidths just fine 
until an offending S-9 +30 signal appears within the roofing filter 
bandpass.   That will likely only occur during contests or other times 
of intense operating activities.  With the 2nd receiver, one could 
always put the in-between filter widths there and switch to receiving 
with the 2nd receiver when the additional filtering is needed.  In other 
words, the FM filter, the 2.7kHz, the 1000 Hz, 400 Hz and 200 Hz in the 
main receiver and 2.7kHz, 1.8 kHz, 1000, and either 400 or 200 in the 
2nd receiver - or something like those combinations, it is all up to you.

73,
Don W3FPR

Mike Fatchett W0MU wrote:
> I had the impression the 2nd receiver had no filters at all.
>
> I had intended to put in a 2.7k 1000 and 400 filters in the 2nd receiver.
>
> I also wanted to be able to operate FM and was going to put the FM filter in
> the 2nd receiver.  Will this work?
>
> The main receiver was going to have the 200, 400, 1000, 1.8 and 2.7 filters.
>   
>