BC-342

The BC-342 was a World War II U.S. Army Signal Corps high frequency radio receiver. It was a 115 Volt AC version of the BC-312 receiver that used the RA-20 rectifier instead of the BC-312's DM-21 dynamotor. It was used primarily as part of field installations such as the SCR-188A, but could be used with mobile sets such as the 2 1/2 ton mounted SCR-399. First designed at Fort Monmouth, New Jersey by the U.S. Army Signal Corps, it was built by various manufacturers including RCA. Many of the later units that are encountered today were manufactured by the Farnsworth Television and Radio Corporation of Fort Wayne, Indiana. Its low frequency counterpart is the BC-344 radio receiver that is almost identical to the BC-342.

Specifications
The BC-342 could be operated from fixed and mobile positions.
 * Power - AC power supply. 12 volt tube filaments. Three pairs of 6 volt tubes were wired in series.
 * Manual Reference: TM 11-850
 * Components: RA-20 Power Supply
 * Weight: 58 lbs.
 * Frequency Range: 1.5-18 MHz
 * Power Input: 110 VAC 60 Hz
 * Part of: SCR-197, SCR-237, SCR-277, SCR-299, SCR-399, MRC-1

10 vacuum tubes included:
 * RF amplifiers - 6K7 (2)
 * Mixer - 6L7
 * Local oscillator - 6C5
 * IF amplifiers - 6K7 (2)
 * CW oscillator (BFO) - 6C5
 * Detector/1st AF - 6R7
 * Audio output - 6F6
 * Rectifier - 5W4

The BC-342 was similar to the BC-348. Heavy chassis design was employed to minimize drift and oscillator instability due to temperature changes and vibration.

BC-312
(note also SCR-210 In stand alone configuration)
 * 12/24 volts DC power requirements. 6 volt tubes (Valves) connected in series with filament strings.
 * 12A6 audio output tube in series with a resistor.
 * Dynamotor B+ supply.