SHOWCASE 2. CELL 2-10
Lend-Lease
Radios
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BC-221-AC
- Precision heterodyne frequency meter designed to measure or
radiate radio-frequency impulses between 125 kHz and 20 MHz.
Made by Rauland Manufacturing Co. from 1942. Supplied to the
USSR by The Lend-Lease Act in 1942-1944.
To
be continued after the picture set...
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BC-221-AC
heterodyne frequency meter was portable, self-contained, used
mainly to calibrate field radio receivers and transmitters by
direct comparison with the crystal-calibrated variable frequency
oscillator of the instrument. Frequency readings provided by a
calibration book. Contained 1 MHz crystal oscillator and
variable frequency oscillator operating in two switched ranges:
125 to 250 kHz and 2 to 4 MHz. The 2nd, 4th and 8th harmonics of
the low-frequency range were used to cover 250 kHz to 2 MHz,
while the 2nd, 4th and 5th harmonics of the high-frequency range
were used to cover 4 MHz to 20 MHz. Required six BA-2 batteries
(22.5V each), four BA-23 batteries (1.5V each) and HS-30
headset. P-18 or P-20 headsets may also be used.
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