[Milsurplus] BC-221 on Shock Mount

[k2cby at optonline.net]

What you have is a TS-164/AR frequency meter.. You will notice that there is
no battery compartment. That's because the case - which was sometimes
supplied without the frequency meter itself - was intended to be mounted
alongside the BC-348 liaison receiver. The unit draws filament voltage from
the 24-Volt radio bus and B+ from the receiver's dynamotor. The rear
compartment of the box contains ballast tubes that drop the 24 volts down to
6 volts and a lamp that drops the receiver B+ of 200 or so volts down to 117
volts for the frequency meter plates. A VR tube in parallel with the B+
supply acts as a voltage regulator. A clever feature is a relay which, when
it senses that current is being drawn from the filaments of the frequency
meter, activates the plate voltage. There is a full description and
schematic diagram at https://aafradio.org/docs/TS-164.html.

 

Miles B. Anderson, K2CBY
16 Round Pond Lane
Sag Harbor, New York 11963-3821
Phone: (631) 725-4400
FAX: (631) 725-2223

e-mail: k2cby at optimum.net

 

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