The RBM was developed during World War 2. It was used as a manpack (two load) ground station for communication in rifle Regiments and Artillery Brigades to HQ and sometimes from Division to Brigade.
The set comprises two distinct units: the transceiver unit and battery case mounted in similarly looking boxes.
The RBM-1 was developed in the late 1940s and early 1950s. It found use in many USSR satellite countries.
Frequency range 1.5-5MHz in two ranges.
RF output R/T 0.3W CW 1W.
Powered by 2.4V NiCad and 240V HT dry battery. Alternatively vibrator power pack.
Battery valved with 2.4V filaments are used throughout.
Set has separate transmitter and receiver tuning.
The RBM-1 was the most recent produced version.
500kHz marker in receiver is used for calibration of scale.