[Elecraft] Reflector: K3 Roofing Filters

[Bill Frantz]

I do a lot of PSK31 on my K3. I use about 2K of bandwidth when 
looking for signals. When I start a QSO, I narrow the bandwidth 
-- some times all the way to 50 Hz -- to limit audio overload to 
my sound card from nearby loud signals. I have a 250 Hz filter 
installed, and the reduction in general noise when it cuts in is 
noticeable. (I am away from my radio at the moment, but I put a 
fair bit of gain boost into the filter definition for the 250 Hz 
filter, I think about 6 dB.) Since filter switching in the K3 is 
automatic with changing the DSP bandwidth, there is no extra 
work for the operator in having the correct filter in-line.

Cheers - Bill, AE6JV/4

On 8/7/13 at 3:00 AM, raycoles96 at gmail.com (Ray Coles) wrote:

>Since this subject is current (and likely always will be!) I have to ask the
>learned brethren which filter does experience show to be best for use with
>JT65 mode. I currently only have the standard issue 2.7KHz filter, which of
>course works OK for everything (except I suppose DSB and FM). If I used CW I
>would definitely choose a narrow-band filter, but the waterfall display used
>for JT65, PSK31 etc. might lead me to rely on a 2-3KHz filter for these
>modes, even though the signal bandwidths are much narrower. My question is:
>is anyone using narrower roofing filters and tuning across the waterfall to
>squeeze the most out of those DX data stations? Or am I being dumb?
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