MULTICOUPLER
SYSTEM ON THE DL-2 (1952)
The multicoupling system to be installed on a new vessel,
the Destroyer Leader DL-2 [DL was later called DDG] is shown in Figure 3- 30. The communications
system on this ship uses a minimum number of antennas and is designed for
maximum flexibility.
There are six antennas used with the multicoupling system:
two 35 -foot whips and one wire antenna for receiving, and two 35-foot
whips and one flat -top antenna for transmitting. The receiving antennas
are located forward and the transmitting antennas are located aft so as to
provide the best possible isolation between the two types. Provision is
made to use any equipment with any of the antennas (except the flat -top)
in the event of failure or damage t o certain portions of the ship.
This ship uses three AN/SRA-9 receiving filter assemblies.
Two located at the central Receiving Distribution Unit and one at the
Auxiliary Distribution Unit.
Three transmitting filter assemblies are located at the
Central Transmitting Distribution Unit. One of the filter assemblies,
F-159/SRT has a crossover frequency of 375 kc with switching provisions
for shifting the crossover frequency to 425 kc; another filter assembly,
F-160/SRT has a crossover frequency of 1750 kc; the third filter assembly,
F-161/SRT, has a crossover frequency of 3250 kc with provisions for
shifting the crossover frequency to 3750 kc.
The three transmitting filter assemblies are
stack-mounted. A four-pole, three-gang, Filter Selector Switch is mounted
on the rear of the cabinets. The purpose of this switch is to allow both
transmitters to be connected to any one of the three filter assemblies or
to allow one of the transmitters to be connected directly to the antenna.
This permits more versatile use of the transmitting equipments .
'The UHF multicoupling system for the DL-2 is not included
in this discussion,
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