User:Angrc/AN/GRC-46

   The AN/GRC-46 is an AM set capable of simplex or duplex operations, transmitting and receiving Voice, CW and RTTY. The main components of the set are the T-195/GRC-19 Transmitter, operational from 1.5 to 20 mHz, the R-392/URR Receiver, operational from 0.5 to 32 mHz and the Teletype equipment which can send or receive printed messages. Messages can be sent directly from either keyboard or they can be recorded on perforated tape for later transmission. The primary purpose of this set is to provide Radio-Teletype communications between Company and Brigade level units. The set has a maximum output of 100 watts with a reliable range of 50 miles using a 15-foot whip antenna. Sky waves can extend the range up to several thousand miles, but are unrelaible and unpredictable. It is shelter mounted and carried in the bed of a 3/4 ton M37B1 truck. It would never be used with the vehicle in motion but is designed to be set up for use in a fixed location. In usual operation it uses the whip antenna but it can also use a longwire or any of several other antennas. With additional equipment, the transmitter and receiver alone can be operated from remote locations, up to two miles away from the set.  Power requirement is 27.5 VDC obtained from the vehicle power supply or from a 1.5 KW gasoline generator which is carried in a M101A1 trailer pulled by the M37B1. The teletype equipment is powered by 115 VAC motor generators that are, in turn, powered by the vehicle's electrical system or the DC generator. <B> The AN/GRC-46(A), AN/GRC-46(B) and AN/GRC-46(C) added security and cryptographic equipment for secure operations. A version of the AN/GRC-46 was used in armoured vehicles and is designated AN/VRC-29.</B><BR></FONT> </TD> </TR>