CD2M/17A,B
CD020018 CD2/18
CD020019 CD2/19
CD020020 CD2/20
CD020021 CD2/21
CD020022 CD2/22
CD020023 CD2M/23
Calls for use of CD2M/17 option 3 or 4 i.e. same as
option 1 or 2 but with mains PSUs replaced by PS5/8. Power
requirements nominal 24 V d.c. Box 550mm x 370mm x 630mm.
Sub-units CD2M/17 option 3 or 4. DD 1984.
NICAM 3 Coder. Nicam 3 equipment, coder pair, input is two
high quality audio signals, output is bitstream from 'B'
version.
Basic version is basic coder pair.
'A' version includes multiplexing cards and gives out
2048kbit/s HDB3 bitstream.
'B' version as 'A' but also carries extra provision for
"Hot Spare" function.
Conversion between basic version, 'A' and 'B' is easily
made. Power requirements 250V a.c. 50Hz. 4U BMM frame.
DD 1979. DDHB 3.329(85) (Mods).
16 Way Decimal-Binary Coder. Any single (high level) input
from a range of 16 inputs is encoded to a 6-bit parallel
binary output. If more than one input is selected
simultaneously only the highest number is encoded. Power
requirements +5V. 3U unsupported card 190mm long. DD
1979.
Aerial Bearing Coder. Converts 3-phase aerial control
voltages into 10-bit parallel BCD. Power requirements +5V
f15V. 3U unsupported card. DD 1980.
Aerial Bearing Coder. Provides the facility of adding
correction digits to a parallel BCD code representing
aerial positional information so that the bearing has an
absolute
reference.
Power
requirements
+5V.
3U
unsupported card. DD 1980.
NICAM 3 Range Coder. This unit examines blocks of 32
samples and generates a NICAM type range code. These are
combined in groups of three and coded with Hamming
protection bits. Power requirements 5V. CH1/64J. Parent
equipment
CD2M/7.
DD
1980.
DDMI
6.367(80).
DDHB
6.211(83).
PLBS Coder. This unit simulates the transmitter section of
HP 1645A Data Error Analyser. It provides oucputs of data
and clock signals at TTL levels. Power requirements 650mA
at 5V. BMM 4U unsupported printed circuit board with
PN1/29A front panel. Parent equipment GE7P/10. DD 1980.
NICAM 3 Insertion Equipment. Equipment to
3 channels into a 2048 kbit/s bitstream.
available:
Option 1
insert two NICAM
Five options are
Tributary input, 676 kbit/s.
O/P at 676 kbit/s average rate.
Tributary input, 2048 kbit/s.
O/P at 676 kbit/s average rate.
Tributary input, 676 kbit/s.
Main I/P and O/p, 2048 kbit/s.
Tributary input, 2048 kbit/s.
Main I/O and O/p, 2048 kbit/s.
Tributary input, 676 kbit average
rate (local coder). Main I/P and
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Option
2
Option
3
Option
4
Option
5

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