[ARC5] Heathkit Folks: Early "Heath Company" Aircraft Transmitter.

[Mike Morrow]

Bob wrote:

> Also, while there's clearly a dot in front of your "6", there isn't on 
> mine.   Could this mean yours was a "QRP version for battery power 
> operation"?

The RCA AVT-111 light aircraft transmitter (to which the the Heath HT-4
bears some resemblance, IMHO) was also made in two versions.  The
high-power version which used 6V6 tubes and required an external power
supply, and the low-power version that used directly-heated cathode tubes
and a dry-battery power source.   It seems that dry-battery-powered
sets were popular, especially for the beacon-band receiving sets, but
much less common for transmitting sets.  The AVT-111 operated on either
3105 or 6210 kHz, and apparently the HT-4 did also.  Dave's HT-4-B3
just says 3105 or AUX on the frequency selector.

> I've read that there was an "HR4" receiver but can't confirm that...

I wonder if that reference doesn't in fact refer to the MA-4.

The reference I cited in an earlier post says that the MA-4 never
had the 1020 Hz AF filtering that was valuable in that era...but
many of the low-cost aircraft receivers lacked that.

My favorite light aircraft set is the GE AS-1B from 1945.  It
has a two-band receiver (Beacon and broadcast), AF filters, loop
connection, and a 3105 (later 3023.5) kHz transmitter.  It was
only about $200 new (equivalent to more than $2000 today).

Mike / KK5F




, and suspect if there is it would be a LF receiver, as the standard 
>back then was for the a/c to transmit on HF and listen to the tower over 
>the LF beacon transmitter.  There was also  a brief period where MF and 
>VHF were used, before everything moved to the modern VHF band.
>
>73, Bob W9RAN
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