PF1 (aka SPF)  Portable Radiotelephone


Type: PF1-83180
Frequency Range: ?
Transmitter Power Output: 2.5 watts
Circa: 1930's
Specification: 82820
Comment: The set with the green panel below looks similar to the American CS-25 set but with the front panel controls re-arranged slightly. This version was used by the Canadian Army. "SPF" has of course, become a generic term for these radios which were built by two manufacturers in Canada and at least four in the U.S.

General views of the radio. 
All photos in this table by Moe Fretz

Chassis views
All photos in this table by Moe Fretz
Nameplate and carrying case 
All photos in this table by Moe Fretz
The receiver/transmitter with the blue panel below was acquired by collector Moe Fretz in 2015. It does not bear any manufacturing designation other than the Department of Lands and Forests nameplate.  If anyone can identify this set, please contact:

Frequency operating range: ?
Frequency control: Crystal for both transmit and receive (?)
Power output: ?
Modes:  CW/Phone

The control markings on the front panel are not that legible so they will be described here.
* The Mic jack in on the left towards the top of the panel.
* The flip switch which at the top-left is labelled  "Send" to the left, "Off" in the centre position and
   "Receive" to the right.
* Diagonally (to the right and below) below the mic jack  is a large knob simply marked "Rheostat".
* At the lower left is a screw down terminal, possibly a ground connection.
* Centre bottom is the Phone/CW toggle switch..
* The knob on the right side of the panel is marked "Volume"
* In the centre/right is a  chicken head knob which points to:
   Left position - "Adjust to 2 volts".
   Centre position - "B voltage"
   Right side - "Adjust to 24 ma."
* The Lower right corner is a permanently attached cord with a 5 pin connector.

At the left is a known PF1 set built by Canadian Marconi. The mystery radio at the right seems to have come from the same family. 
Top view - the mystery radio is on the right while the PF-1 is on the left. MAny of the chassis components seem to have similarities. 
This is the only identification on the set. The American version of the set, namely the CS-25, was used by the United States Forest Service and the US Army, 
The speaker and case of the mystery radio as suspiciously similar to the PF-1 radio.
The case of the mystery radio is ust a bit smaller thana that of the PF-1 
All photos in this table by Moe Fretz.

Contributors and Credits:

1) Moe Fretz <tubetester(at)>

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Nov 27/16