[Hallicrafters] Questions for OLD-timers (Hams)

[Glen Zook]

Heath made the CA-1 Conelrad monitor in two different
versions.  Electronically they were the same but the
earlier model had a small red indicator lamp jewel
that fit in the "standard" 3/8 inch hole and the later
model had a red indicator lamp jewel that is a little
over 1 inch in diameter.

I have one of the later versions.

Your transmitter AC power cord plugged into the
monitor which was connected to an AM broadcast
receiver (even the old AC/DC sets could be used) AVC
circuit.  When the broadcast station went
"off-the-air" the change in AVC voltage then activated
the Conelrad monitor which, in turn, disconnected the
AC voltage to the transmitter.

During the Conelrad years an amateur radio operator
was supposed to monitor a broadcast station and to
cease transmitting when the broadcast station ceased
transmitting.  Supposedly this was to keep the
Russians from "homing in" on an amateur radio station.

Glen, K9STH


--- "Kenneth G. Gordon" <kgordon2006 at verizon.net>
wrote:

On 24 Apr 2008 at 14:05, Troglodite at aol.com wrote:

Very true. One thing that has not been mentioned in
the 50's 60's era was the necessity for a Conelrad
Monitor. This was a requirement that was in effect
when I was first licensed in 1954. The operator needed
a means to monitor a 24 hour AM broadcast station. If
the station shut down, your transmitter was supposed
to be automatically shut down. I believe it was OK to
shut down manually based on an indicator of the AM
station shutting down. I don't recall exactly when
this requirement was dropped.
 
Yes indeed. You could shut your station down manually,
but you HAD to continuously monitor an AM BC station.
There were automatic monitors available from several
sources, including Heathkit, for such devices.









Glen, K9STH

Website:  http://k9sth.com


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