AT-1 and AT-7 Transmitters

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The AT1 and AT-7 transmitters were made for the RCAF by Canadian Marconi and intended for airborne use. An AT-2 receiver was paired with the AT-2 receiver on 12V.   The AT-7 was the 24 volt version of the AT-1 and was paired with the AR-6 ( 24 VDC) receiver.

SPECIFICATIONS

Type: RCAF 10D/1267
Modes: CW/MCW/ Voice.  Six selectable tones on MCW.
Frequency Range: 1.5 to 20 MHz (plus 375 and 500 KHz) for the transmitter and
                                 140 to 400 KHz plus 480 KHz to 21 MHz for the receiver.
Power Output:  15 watts
Frequency Control: Two channels: "A" MF and "B" HF which can be either master oscillator or
                                  crystal controlled. This set uses 3 prong crystals.
Tube lineup: 3 x RK-39, 1 x 6J5 and 1x 6H6
Primary power:  12 or 24 VDC. The operating voltage is printed on the front panel.
Circa: 1943

One application for these radios found its way into the Blackburn Shark aircraft.
In another application,  the AT-1 radio was fitted into boats of the RCAF marine squadrons.

Comment from Tom Brent:

"This set is interesting to me due to the fact it was designed as an aircraft radio but was adapted for use aboard boats in the RCAF Marine service. There were a number of airborne military radios that underwent this process, most often carried out by commercial firms who took advantage of the glut of war surplus equipment available after 1945" .
 

AT-1 transmitter. (Photo by Jerry Proc)

Top view

Bottom view.   (Photos in this table via E-bay)

With AT-1 fitted in the carrying case.

Carrying case markings.

Carrying case photos via E-bay

Contributors and Credits:

1) Observations on the RCAF AT1/AR2 by Dave Lawrence, VA3ORP    http://www.qsl.net/ve3bdb/at1ar2.html
2) Copy from E-bay which accompanied the AT-1.
3) Tom Brent <navyradiocom(at)gmail.com>
4) Jacques Fortin <jacques.f(at)videotron.ca>
 

Mar 14/23