I do the same transmit filter on my ANAN 100 at 1450-2050.Don't see any reason
we couldn't do a split adjustment at offset-25 for FT8 and run a 100Hz filter.
That's the minimum filter size PowerSDR will take.So for a 1900 offset you
would get split at 1875m, your signal at 1900-1950, and the upper end of the
filter at 1975.
For my ANAN 100 the difference is minimal between a 600Hz filter and a 100Hz
filter as the harmonics are down 60Db but it down maybe 2-3dB.For any kind of
noisy rig though this may be a good idea...Any reason we can't run a default
100Hz split option instead of 500 and keep the audio at 1900Hz?
With 600Hz filter
With 100Hz
On Monday, May 7, 2018, 9:16:06 AM CDT, Al Pawlowski <k6...@almont.com>
wrote:
This was not obvious to me from reading the manual or noting that the dial
frequency was moved up or down. It is key that the audio frequency is also
moved opposite the dial frequency an equal amount and both should be mentioned
in the manual - for slow heads like me at least. Anyway, I get it now.
I also did some FT8 QSO’s last night using “fake it” and my tx filter set for
1500 to 2000. Though I could not see much difference in my tx on my monitor, it
seemed to work pretty well as PSK showed me getting to the East coast and
Northern SA with 10W on 20m. The antenna is an MFJ tuned loop at 10ft.
For those of us with tunable tx filters, it might even be useful if WSJT-x had
a user adjustable split offset. Be interesting to see how narrow one could
really go.
Al Pawlowski, K6AVP
Los Osos, CA USA
On May 7, 2018, at 01:29, wsjt-devel-requ...@lists.sourceforge.net wrote:
Date: Mon, 7 May 2018 09:29:49 +0100
From: Bill Somerville <g4...@classdesign.com>
To: wsjt-devel@lists.sourceforge.net
Subject: Re: [wsjt-devel] Observations during 5/5/2018 DX testing
exercise
Hi Tim,
some comments in line below………………….
The principle is simple really, your on-air transmit
frequency is the sum of your USB dial frequency and the audio offset
sent to you rig. WSJT-X can adjust both of those values in opposite
directions by equal amounts and thereby not change your on-air transmit
frequency. This is what "Settings->Radio->Split Operating" does such
that the audio tones sent to your rig are always between 1500 Hz and
2000 Hz……………………...
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