The R-104M is an Amplitude Modulated ( AM ) vehicle or Man packed transceiver. It consists of : a transceiver, an antenna matching unit, a battery pack, a vehicular power supply and related accessories. The transceiver is housed in a metal case, 35 x 42 x 24 Cm, weighing 25 Kg with a removable front cover. the cover protects the various knobs and controls that operate the radio. It can be recognised by a leather carrying strap on top and a large bevelled frequency window. The matching unit is also housed in a metal case with a removable top which protects the cable connections and the two 2.4 volt DC batteries. The top also stores the 4 meter whip antenna. The vehicle power supply is housed in a metal case and has two cable connector jacks and two wire connectors for power. The accessories consist of two power cables, a handset / headset, a CVC helmet. a repair kit and the various antennas.The set is capable of AM / CW and covers the frequencies from 1.5 to 4.25 MHz. It has continuous antenna tuning and a transmitting range of 50 Km. It can be powered by 12 VDC from a vehicle battery or 4.8 volts from rechargeable wet cells.
The matching unit is 17.8 x 6.3 x 6.3 and weighs 2.2 Kg. , The Battery pack is 35 x 15 x 20 Cm and weighs 10.5 Kg. , and the vehicle power supply is 10 x 16.5 x 21 Cm. and weighs 9 Kg. The set can be remotely operated from 300 meters away using a field telephone. This set can communicate with the R-102, R-103, R-112, R-118 and the R-130 systems.
The set is used in Motorised Rifle and Artillery Regiments and also is used by the Reconnaissance, Signal, and chemical elements of a tank battalion. It has been replaced by the R-104 M which has an expanded frequency range of 1.5 to 4.5 MHz. These sets have been replaced by the R-129 for manpack operations and by the R-130 for vehicle operations.
The set is capable of AM / CW and covers the frequencies from 1.5 to 4.25 MHz. It has continuous tuning and a transmitting range of 50 Km. It can be powered by 12 VDC from two 6 volt batteries or 4.8 volts from rechargeable wet cells In low power operation the power output is 1 watt for AM voice mode and 3.5 watts for CW. In the high power mode, 10 watts are provided for AM voice and 20 watts for CW. In the high power mode and with the proper antenna, etc the set has a range of 50 Km ( 31 Miles ) The continuous tune characteristic of this set makes it possible to tune up to 275 fixed frequencies by using the graduations on the frequency dial.The set is designed to use a wide range of antennas to include a 4 meter whip, a log wire, a 50 meter wire, dipole and an 11 meter telescopic mast and an inverted "L".