[Elecraft] subrx and filters

[Mike Markowski]

Juha,

Yes, I would recommend having both matching filters in your subreceiver.

In my main receiver I have filters for 13/6/2.8/0.4 kHz.  In the sub I chose
only 2.8/0.4 kHz filters and am happy with the choice.  I've found no need (so
far!) for AM & FM filters in the sub.

Here's why I like the 2,8 and 0,4 kHz filters.  For dx, I put the sub on the dx
op's transmitting freq and tighten up the filter to 400 Hz or less.  Then I have
the main receiver opened up to 2.8 kHz or even wider on occasion.  Using
software on my laptop, the freq spectrum is displayed - a poor man's P3! - and
my tx freq is chosen after discovering the dx op's listening pattern.  I also
turn up the audio on the sub (dx's transmit freq) relative to the main so that
I'm sure to hear when my call finally is answered.

The 2,8 comes in handy for SSB in a similar way, but I use the still wider
filters of the main to hear the pileup.

So far, this works so well that I'm not sure I need a P3.  But I'm open to being
convinced otherwise.  After all, can you ever have enough gadgets?  :-)

73,
Mike ab3ap

On 03/09/2011 07:29 AM, Juha - oh6os wrote:
> Hello,
> 
> I am thinking to buy KRX3. The main K3 I have 2,8 kHz and 400 Hz filters.
> What I need to subRX? Is 2,7 and 500 good choice and do I need KFLMATCH?
> 
> juha - oh6os
> K2#4781
> K3#2100