Remote control of tactical radios MQ-300, MQ-508, MQ-510 and MQ-608.
The remote unit is a magneto field telephone, connected directly or using a switchboard.
Manual operation – when remote user wishes to transmit, the operator presses the appropriate switch.
Used by the US military during WW2, designated RM-29-A.
Used by the IDF during the War of Independence (1948) and the Sinai Campaign (1956).
Using BU-27 battery. Weight: 7 Kg.