Here's an illustrative failure scenario:
1. A station in Pittsburgh is in a digital mode QSO with a station in San
Francisco.
2. A Winlink user in South Carolina listens, doesn't hear the station in
Pittsburgh or the station in San Francisco, and so activates a WinLink RMS
in Washington DC
The WinLink RMS transmissions make it impossible for the station in
Pittsburgh to copy the station in San Francisco, destroying that QSO.
Had the WinLink RMS been equipped with a competent busy frequency detector,
it would easily have heard the station in Pittsburgh, and thus ignored the
activation request from the South Carolina station.
73,
Dave, AA6YQ
-----Original Message-----
From: RTTY [mailto:rtty-bounces@contesting.com] On Behalf Of nq4u@mtars.org
Sent: Tuesday, April 22, 2014 5:41 PM
To: rtty@contesting.com
Subject: Re: [RTTY] New Winlink usage
I have been following this thread with great interest and some of the
comments really surprise me. Especially the comments about interference
being caused by the unattended WINLINK RMS.
Now as for me, I do operate a WINLINK RMS for MARS use with Pactor 1 thru 4.
Also operate an amateur VHF 1200 baud packet WINLINK RMS for local use and
training. I also enjoy operating CW and RTTY in contest and chasing DX.
One of the things that folks need to remember about using the WINLINK system
in the U.S. is that an operator (the end user) must initiate the contact to
the RMS. It is legal for operators in some other countries to use the
automated forward system on Amateur frequencies but not in the U.S. The RMS
that is either listening on a single frequency or scanning five frequencies
DOES NOT initiate the contact at least in the U.S amateur bands.
So when station WD#??? calls RMS AA#?? then who is actually causing the
interference? Well let's see if my old thinking is correct or not
--- I think it would be the station that initiated the call to the RMS. That
station did not listen to see if the frequency was in use before he or she
transmitted.
Just some food for thought.
73
Jimmy
NQ4U
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