I think the way I would characterize it is as follows:
#1 FSK is limited by the implementations present in commercially available
radios
#2 AFSK is limited by the ability, diligence and patience of the hams using it
In the long run and with a real world population, #1 usually is the lesser of
the two evils.
Al
AB2ZY
________________________________________
From: RTTY <rtty-bounces@contesting.com> on behalf of Don AA5AU
<aa5au@bellsouth.net>
Sent: Monday, October 24, 2016 4:25 PM
To: Lee Roberts; RTTY@contesting.com
Subject: Re: [RTTY] FSK is bad?
It's all relative Lee. FSK is not bad, it's just the way some radios transmit
FSK causes the signal to be wide. If we all had Elecraft K3's, we could reshape
the FSK signal bandwidth and all would be dandy. But we don't all have K3's and
many of us (including myself) can't afford one anyway so we are stuck with what
we have.
If you do own a K3 and narrow your FSK signal, you are at a disadvantage during
a contest because other stations can get closer to you and cause you to have to
move. If you have a wider FSK signal, stations will not be able to get as close
to you without having receive problems of their own. Thus your signal will be
found and copied by more people. This is an advantage for wideband FSK users.
Jitter? Not sure I ever lost a contact because of jitter but I suppose it's
possible.
Don AA5AU
From: Lee Roberts <ham@n0sq.us>
To: RTTY@contesting.com
Sent: Monday, October 24, 2016 2:27 PM
Subject: [RTTY] FSK is bad?
When I first started in RTTY, FSK was the thing to do. Now, a lot of
people are saying that it has multiple issues and are now telling me
that AFSK is the way to go. But, I've heard that pFSK has no jitter
issues when using tinyFSK and an Arduino board. Since I've heard that
FSK has jitter issues under Windows, I wonder if jitter is a problem
using FSK in Linux. But, as far as I know, there aren't any Linux
contesting programs that use FSK - fldigi has the option for pFSK though.
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