It depends on conditions and software. For example JT65-HF does not
like to decode if it does not see the entire 200-2800 Hz audio spectrum
but WSJT-X seems to work fine with a restricted bandwidth. All of the
software is designed to cope with the entire 0 - 4000 or 0 - 5000 Hz
spectrum but there are times that it is advantageous to narrow the K3's
IF to prevent one or more strong close in stations from capturing the
AGC and reducing the gain.
73,
... Joe, W4TV
On 8/7/2013 9:03 AM, Matt Zilmer wrote:
For JT65, WSPR, etc. I just use the narrowest filter when on frequency
and the P3 to see where signals are. In my case, that filter is the
250 Hz.
With the K3, remember that you're not selecting a filter so much as
setting a bandwidth. Filters kick in as they're called for, and this
is slaved to the WIDTH or LO/HI control. You can also force a filter
selection (as with the K2) using the XFIL switch, but doing so forces
the WIDTH set to the rated filter bandwidth at the same time.
73,
matt W6NIA
On Wed, 07 Aug 2013 11:00:33 +0100, you 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?
Ray Coles, C.Eng. M0XDL
10 Littlemoor Road,
Weymouth DT3 6AA
Tel: +44 (0) 1305 833699
Mob: 07831 516517
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