R.A.F. Henlow Signals Museum Exhibits

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Meter Electronic Test	Meter Field Strength I-95 BM	Meter Frequency Type BC-221-N	Meter Frequency Type BC-221M	Meter Frequency Type BC-221-T

Meter Frequency Type BC-221-N

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 N refers to manufacture by the Philco Corporation. The BC221 was far superior to the British Type W1191 wavemeter.

Meter Frequency Type BC-221-N (Photograph Number 0313)

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