[Elecraft] subrx and filters

[Jim Brown]

On 3/9/2011 6:48 AM, Mike Markowski wrote:
> Yes, I would recommend having both matching filters in your subreceiver.

One variation on that.  While your technique of using the wide filter to 
listen on the DX frequency is a good one, the lower cost 2.7 kHz filter 
accomplishes that just fine. The only reason for MATCHING filters 
between the two receivers is for diversity reception, where the phase 
characteristics of the filter can make a difference. Every time I've 
used diversity reception I've had a much narrower filter engaged.

My radios have 2.7 kHz, 1.8 kHz, 400 Hz, and 250 Hz filters. You only 
need the 1.8 kHz and 250 Hz filters if you're a serious contester. 
Otherwise, the 2.7 kHz and 400 Hz filters are a very good choice. My 
neighbor, K6XX, an engineer who works for Elecraft, advises me that it's 
good to have a 2.8 kHz filter on the MAIN board, so that you are 
transmitting through it.

73, Jim K9YC