UN18
UN18/S01
UN18/S01A
UN18/S01B
UN18/S02
UN18/502A
UN18/502B
UN18/503
UN18/503A
UN18/504
UN18/50S
UN18/506
UN18/S07
UN18/508
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UN18 CHROMINANCE UNITS
Used in GE1/522 to provide original I and Q signals from
the encoded signal delivered by UNl/540. Has auto,
preset, manual and mono modes of operation. 625 line
standard
'I'.
CHl/12D.
DD 1964.
DD Spec 8.187.
OBSOLESCENT.
Similar to UN18/501 but for 625 line standard 'G'.
DD 1964. WITHDRAWN.
Similar to UN18/S01 but for 525 line standard.
WITHDRAWN .
DD 1964.
Used in GEl/521 to provide the complete chrominance
information for the NTSC signal. Input from UN1/549 and
output to UN19/502. 625 line standard 'I'. CHl/12D.
DD 1964. DD Spec 8.199. DDHB 8.168. OBSOLESCENT.
Similar to UN18/502 but for 625 line standard 'G'.
DD 1964. DD Spec 8.199. DDHB 8.168. OBSOLESCENT.
Similar to UN18/502 but for 525 line standard. DD 1964.
DD Spec 8.199. DDTM 8.168. OBSOLESCENT.
PAL Encoder Chrominance Unit used in GElM/526 to produce
the complete PAL chrominance waveform from RGB colour
components. 625 line standard 'I'. Includes 3 MD2/504.
CHl/12D,
pegs
2,
43.
DD 1966.
DD Spec 8.219.
DDHB 8.213. ACO. OBSOLESCENT.
As UN18/503 for 625 line standard 'G'.
DD Spec 8.219. DDTM 8.213. OBSOLESCENT.
DD 1966.
PAL Decoder Chrominance Unit used in GElL/528. Accepts
the composite colour signal and decodes the chrominance
signal to provide outputs of R-Y and B-Y. CH1/12A, pegs
3,
39.
DD 1966.
DD Spec 8.227.
DDHB 8.216.
ACO.
OBSOLESCENT.
NTSC Decoder Chrominance Unit used in GE1L/527. Accepts
the composite colour signal and decodes the chrominance
signal to provide outputs of R-Y and B-Y. CH1/12A, pegs
4,
38.
DD 1966.
DD Spec 8.229.
DDHB 8.230.
ACO.
OBSOLESCENT.
NTSC Demodu1ator Chrominance Unit. Demodulates NTSC
signals from UN1/583. Modified UN18/505. CHl/12A.
DD 1967/68. WITHDRAWN.
Modified and Line Delay Chrominance Unit used in EQ12M/502
to provide the conjugate of the incoming chrominance
vector, delay it one line (64~s) and use this delayed
signal
to
derive
an
error.
CHl/12A.
DD 1967/68.
WITHDRAWN .
I and Q Chrominance Unit used in C06/504 to amplify and
combine I and Q signals to form colour difference signals.

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