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Page Updated 9 May 2004

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Stornophone 13/33

Commonly known just as as the Stornophone the type designations were CQM33 for the 70-88 MHz and CQM13 for the 152-174 MHz band. Introduced in the mid-fifties, there was also a mains powered range for fixed station use.
 
         
 
Stornophone assembly
 

Design features

The Stornophone's construction consisted of the transmitter, receiver and powers supply sections built up on a common chassis suspended from the front panel. This assembly slides drawer style into a steel cabinet retained by a pair of snap fasteners. The cabinet is dust and splashproof.
 
         
 
Stornophone chassis
 

Technical Developments

The early Stornophone used a mechanical vibrator power supply to convert the vehicle DC battery voltages up to the voltages required for the valve HT supply but by the late fifties a pair of 2N441 (24V sets used 2N174) transistors were being used. These later models are easily identified by the large heatsink mounted between the front panel connectors. Transistors were also to be found in the control head microphone preamplifier. Channel spacing was initially 50 kHz but the The Stornophone was also the first mobile approved for 25kHz operation in the UK.

 
         
 
Stornophone marine
 

System capabilities

Special versions include a marine edition with the ruggedised CB13-5 channel control head and 6 channels instead of the usual 4.
 
         
 
CB13-4
 

CB13-4

The Stornophone was designed with a main transceiver unit and remote control head. the standard control head featured a channel switch with positions for off and channels 1 through 4 which also doubled as the transmit switch when pressing down on the knob. The volume switch had 5 positions and pressing it in enabled the transmitter pre-heating (approx 30 seconds warm-up time). The 100V DC shaver socket was on the right side at the rear of the box!
 
         
 
Stornophone installation
 

Installation

The cabinet could be mounted at any angle from horizontal to vertical but not in any position where it was likely to be covered by luggage etc. as this would risk overheating of the unit.
 
         
     
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