Model: SCR-211-AE Frequency Meter Set - Philco, Philadelphia Stg. Batt
Portable set > 8 inch (also usable without mains)
10.5 x 15 x 9.75 inch / 267 x 381 x 248 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. 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. Electrically and mechanically similar to model BC-221-AG.
Some units were supplied with AC power supply RA-133-B instead of batteries.