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MICR
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TURNTABLE
OP 7
AND
MIXER
RECORDER
AMPLIFIER
CROPHONE INPUTS
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Fig. 3. Transmitter bus — audio distribution.
cessibility and ease of operation all microphone inputs, P.A. speaker feeds and intercommunication jacks are mounted on an aluminum strip which runs the width of the bus just below the cable reels. An RCA RT-11A rackmounted (studio-type) tape recorder, a portable disc recorder-turntable, and a 30-w Brook amplifier with a bass reflex speaker used as a monitor system assure adequate audio facilities.
Figure 3 shows a simple block diagram of the audio layout. The OR-1A amplifier and its associated speaker serve as a public address or talk-back system when necessary.
The audio signal is transmitted to the receiver bus by a 45-w, phase-modulated, police transmitter which has been
modified for high fidelity. A fourelement yagi* is used as an antenna. A bridge off the program line feeding the transmitter feeds audio signal to the kine-recording van.
Each of the four vans is equipped with an FM transceiver on 163 me which serves as an engineering line. Provision is made to operate these units from the bus battery as well as a-c so that communication can be maintained while the vehicles are in motion. An additional transceiver, on 173 me, is provided in both the transmitter and
* Antenna array devised by Hidetsu Yagi in 1928. It consists of an active dipole and several short-circuited dipoles serving as directors and reflectors, to give a narrow beam.
John S. Auld: Mobile Television System
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