I'll chime in on this one... I tested the PC-ALE program a couple of years
ago and, while its busy-channel detection worked well for other ALE signals,
it would key up over just about every other type of signal I fed it,
including SSB voice, RTTY, SSTV, and CW. Makes sense, since ALE was
designed for dedicated governmental/military communications channels, not a
non-channelized multi-modal environment like the amateur bands. Don't know
whether the current version has improved on it or not, as I refuse to join
the HF-Link Yahoo group just to be able to download it.
The client version of RMS Express for Winlink 2000 will warn you that a
channel is busy, but you can force it to transmit anyway. I have heard a
gateway station on 14.084 respond to queries while RTTY signals were
present, but that could be the "hidden transmitter" effect.
George, KA3HSW
----- Original Message -----
From: " Dave AA6YQ" <aa6yq@ambersoft.com>
To: "'Terry'" <ab5k@hotmail.com>
Cc: <rtty@contesting.com>
Sent: Saturday, March 29, 2014 5:40 PM
Subject: Re: [RTTY] Band Plan Points
Re " The busy frequency detectors deployed by unattended digital stations
are not effective."
What leads you to this conclusion?
73,
Dave, AA6YQ
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