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, raycole...@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?
-------------------------------------------------------------------------
Bill Frantz | The first thing you need when | Periwinkle
(408)356-8506 | using a perimeter defense is a | 16345
Englewood Ave
www.pwpconsult.com | perimeter. | Los Gatos,
CA 95032
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