WW2 U. S. Army Signal Corps Frequency Meter BC-221-Q

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WW2 U. S. Army Signal Corps Frequency Meter BC-221-Q :
$249.00

The wiring is great, schematics clear and legible,the battery box is present and in good shape.This frequency meter has not been tested , but appears to be in perfect condition. As seen in photos there is a full set (4) of replacement tubes on board.

Dimensions (WHD) 10 x 13.7 x 9.25 inch / 254 x 348 x 235 mm

Precision heterodyne frequency meter designed to measure or radiate radio-frequency impulses between 125 kHz and 20 MHz. 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. Supplied mostly with wooden cabinet, yet some BC-221-Q would come with aluminum-alloy metal cabinet. Dimensions and Weight are shown for a metal cabinet model. Required six BA-2 batteries (22.5V each), four BA-23 batteries (1.5V each) and P-18 or P-20 headset. HS-30 headset may also be used. Minor circuit differences with model BC-221-B.

Manufacturer / Brand: Cardwell Mfg. Corp., The Allen D.Year: 1942 Type: Service- or Lab Equipment

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