ORIGINAL MESSAGE:
On Sun, 10 Feb 2013 17:22:00 -0900, AL9A wrote:
>Several characters, pause, some
>more characters, pause then a few more, pause.
REPLY:
I didn't hear the station this weekend, but another thing this might be is
that the sending station had diddles turned off. What you would hear is a
steady tone, then a burst of some characters, then a steady tone again.
I haven't heard that on the air in a long time but it used to be common.
Back in the '90s Brian Beezley, author of RiTTY by K6STI, published a paper
arguing in favor of having diddles turned on because it allows a decoder to
keep "sync" when no actual characters were being sent. It also allows the
use of Automatic Threshold Control (ATC), which MMTTY has a button for. It
caught on and now you almost never hear a non-diddle signal.
Brian called it the "numerical flywheel", which is a very descriptive name
for it.
I still have a copy of Brian's document. If you'd like a copy, let me know.
It is three pages in Word .doc format.
Bill, W6WRT
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