Ed,
In the IC-7600 the bandwidth choices vary depending upon the selected mode.
There are three different filter presets for each mode. In LSB/USB the
bandwidth can be set anywhere from 3.6 kHz to 50 Hz. Not terribly useful
for SSB, but it is possible. In SSB I have three bandwidth presets at 2.5,
2.1 and 1.8 kHz. In RTTY the bandwidth ranges are adjustable from 2.7 kHz
to 50 Hz. My usual presets are 400, 300 and 250 Hz. In CW the bandwidth
range is from 3.6 kHz to 50 Hz. I use the same filter presets for CW as I
do for RTTY - 400, 300 and 250 Hz.
I always run FSK as this allows me to use the Twin Pass filters built into
the 7600. As you have indicated it may not be possible to use Gritty in a
contest unless it were connected to a second receiver using a bandwidth
significantly wider than that typically used in RTTY.
73,
Gary AL9A
-----Original Message-----
From: Ed Muns
Sent: April 10, 2015 7:07 AM
To: 'Gary AL9A'
Cc: 'WriteLog Reflector'
Subject: Re: [WriteLog] GRITTY working with WL?
What IF bandwidth selections are available in RTTY/FSK mode on your radio,
Gary? The K3 allows any bandwidth, continuously variable up to 3 kHz. The
issue is not AFSK vs. FSK (which is just the transmission method) but rather
the receiver IF bandwidth.
It could be that it requires a 3 kHz bandwidth since it is a component for
RTTY Skimmer. If so, I'm not sure how useful it will be for a RTTY
contesting decoder. It is unlikely I would run GRITTY alone and I need a
500 Hz IF bandwidth for my other decoders.
The N1MM Logger Plus team has interfaced GRITTY and it should be out in a
future release. I guess we'll hear from them as to its merits. I don't
think much can be evaluated until GRITTY can run side-by-side with MMTTY and
2Tone over many hours of contesting.
Even when 2Tone was initially available with WriteLog, my first impression
was that it was "superior" to MMTTY. But, now after hundreds of intense
contesting hours, running MMTTY, 2Tone and the DXP38 in parallel on the same
signal, I'm convinced that each decoder has its superior moments when the
other decoders don't print anything useful. There are certain conditions
where one decoder works and the others don't. If you only experience that
certain condition, it is easy to infer that the decoder is superior in all
conditions.
Ed W0YK
-----Original Message-----
From: WriteLog [mailto:writelog-bounces@contesting.com] On Behalf Of Gary
AL9A
Sent: 09 April, 2015 23:07
To: WriteLog Reflector
Subject: Re: [WriteLog] GRITTY working with WL?
I've downloaded Gritty but haven't had much time to play with it yet. Can
someone enlighten me a bit? Does it only work for AFSK? If I set my
IC-7600 to LSB I can get an occasional call sign to show, but if I put the
radio into RTTY for FSK it appears the band width is too narrow for Gritty
to decode. Or am I off the Mark here?
73,
Gary AL9A
-----Original Message-----
From: Ed Muns
Sent: April 09, 2015 7:48 PM
To: 'Jerry Flanders'
Cc: WRITELOG@contesting.com
Subject: Re: [WriteLog] GRITTY working with WL?
Currently, GRITTY is a standalone decoder. The most obvious way to
integrate it instantly with several loggers is to interface it to xmmt.ocx
which is what WriteLog, N1MM Logger, DXlabs and several others use to
integrate MMTTY, MMVARI and 2Tone.
Ed W0YK
______________________________________________________________
Jerry W4UK wrote:
Anybody got Alex's new RTTY demodulator working with Writelog?
See: <http://dxatlas.com/Gritty/>http://dxatlas.com/Gritty/
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