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R.A.F. Henlow Signals Museum Exhibits

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Meter_Frequency^Type_BC-221-N=0313.jpg Meter_Frequency^Type_BC-221M=0327.jpg

Meter_Milliameter_for_R1084=0047.jpg Meter_Power=0081.jpg
Meter
Frequency
Type BC-221-N		Meter
Frequency
Type BC-221M		Meter
Frequency Type BC-221-T		Meter
Milliameter for R1084		Meter
Power

Meter Frequency Type BC-221-T

This ubiquitous American item was used for calibrating wireless equipments. It is a 125kc/s to 20Mc/s heterodyne frequency meter, with an internal crystal calibrator, and individual calibration book for each unit. Basic accuracy is better than 0.034% over its operating temperature range. An HS-30 type headset, or similar, is required for operation. The units were supplied with one spare set of vacuum tubes inside.
The suffix T refers to manufacture by the Zenith Radio Corporation. The BC221 was far superior to the British Type W1191 wavemeter.
Meter<br>Frequency Type BC-221-T

Meter Frequency Type BC-221-T (Photograph Number 0175)

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