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From: lagasse@biomed.UUCP (Robert C. Lagasse)
Newsgroups: net.ham-radio
Subject: Commercial FM "tweedle"
Message-ID: <85@biomed.UUCP>
Date: Wed, 3-Jul-85 10:08:31 EDT
Article-I.D.: biomed.85
Posted: Wed Jul  3 10:08:31 1985
Date-Received: Fri, 5-Jul-85 06:19:46 EDT
Organization: Mass. Gen. Hosp. - Dept. Biomed. Engineering
Lines: 11


        Living around Boston, I have heard several walkie-talkies that the
transit police carry and also the EMS ambulance people.  They all seem to be
Motorolas.  Anyway, it seems that when the base station releases its mike
key, a couple of single tones are transmitted, very rapidly, one after
another, each about 100mS long, with no space in between them, the first
tone higher in freq than the other.  One is about 1.5kHz and the other a bit
lower, maybe around 1kHz.  WHAT are these for?

All comments appreciated.
N 1 A L G    Bobby L.