TD-3 system: Microwave transmitter and receiver

The basic blocks of the TD-3 radio system are the microwave transmitter and receiver units. Since up to 140 of these units may be connected in tandem, each must meet rather stringent requirements in order to satisfy the over-all system objectives described in the previous paper. The transmitter and receiver units use solid state semiconductor devices (except for the traveling wave electron tube amplifier in the transmitter), and operate from a single −24 volt battery source. The detailed design of these units is presented here with particular attention to thermal noise, cross modulation noise, selectivity, and equalization.