level PCM bitstreams such as HDB3 at rates up to 2048
kbit/s. Power requirements !18 V, 180 mA. 4 U card 140 mm
long. DD 1983. EDI 10482(1)APR 84.
Data Distribution. This unit is designed to interconnect a
number of processing units which together make up the
automatic control system for HF transmitter installations.
The unit accepts up to 20 input and 20 output data
connections, each with separate buffer amplifiers. The
interface standard is nominally RS 422C at input and
output. Power requirements 19-45V dc. 2U x 19" Chassis.
UHF Distribution Amplifier. For use at relay stations.
Supplies up to 4 band IV and I outputs from an aerial
input. Constructed on a printed circuit board mounted in a
diecast box. DD 1975. DDMI 5.300. DDHB 5.107.
Video Distribution Amplifier. 2 U replacement for AM4/519
constructed on CH1/65A. 6 main outputs plus 75Q output on
front panel for connection of 75Q test apparatus. High-
8.567(77). DDHB 8.340. EDI 10262(1)JAN77.
6 dB Distribution Amplifier. 4 U BMM replacement for
AM4/519. 6 outputs at 75 Q. Mains powered. Performance
similar to AM4/519. CHl/64A. DD 1976. DDMI8.582(77).
DDTM 8.343(77). EDI 10328(1)DEC77. Superseded by AM4/536
in most applications.
3-Channel Distribution Amplifier. 4 U BMM replacement for
AM4/522. 4 outputs for each of 3 inputs. Mains powered.
Superseded by AM4/538.
Pulse Distribution Amplifier. This unit will handle all
the common television pulse waveforms, and is designed for
use with the BMM chassis system as a replacement for the
AM4/521. Mains powered. 10 outputs, normal input will be
-6dB with respect to 2V p-p. CH1/64A. DD 1977. DDMI
8.588(77). DDHB 8.351(77).
Data - Video Driver accepts balanced data inputs at emitter
coupled logis or TTL levels for mixed syncs, monitoring
data, and transmission data, and produces two sets of three
video outputs all at 75Q. Three outputs of IV non-
composite filtered data. Three outputs of 0.5V data and
o .3V sync composite filtered waveform for monitoring data
content. Choice of filters by change of sub boards. Power
requirements a.c. mains. CH1/64A. RD 1978.
UHF Distribution Amplifier. Low noise UHF distribution
amplifier with four outputs suitable for feeding UHF
television transposers type TM4M/502. Printed circuit
board mounted in an extruded aluminium chassis. Power
equipment TM4M/502. DD 1980. DDMI 5.399(81).