UN20L!S08A
UN20!S09
UN20!SlO
UN20!Sll
UN20!S12
UN20!S13
UN20!S14
UN20!SlS
UN20!S17
UN20!S2l
UN20!S25
UN20!526
- 405 -
UN20
Similar to UN20L/508 but for 525 line NTSC colour signals.
Comprises UNl!540, UN9!546, DM1!503 with printed back
board for mounting on PN3/23. DD 1967. OBSOLESCENT.
Hum Detector Unit used to clamp black level of the video
signal before application to the gates of MN2M!506 and to
detect low frequency variations in black level. CHl/12A,
pegs 9, 32. DD 1967. WITHDRAWN.
ITS Chroma Detector Unit used in EQ12L!5l0 to measure the
subcarrier amplitude on the minibar and drive the
equaliser unit to correct any error. If the test signal
vanishes the output is switched to a preset potential.
CHl!12A. DD 1967. DD Spec 11.29. ACO. OBSOLESCENT.
UHF Detector Unit used to demodulate UHF television
signals (Bands IV and V) as received from probe units
fitted to transmitter output feeders. Used in conjunction
with MN2M/505. Circular coaxial assembly l02mm long x
25mm maximum diameter. DD 1967. DD Spec 5.126. ACO.
OBSOLESCENT.
Chrominance Pulse Detector Unit used to provide monitoring
of the colour signal in MN2M/506. CHl/12A. DD 1967.
WITHDRAWN .
405!625 Standards
switching between
PS2/22C. CH1/l2A,
AeO. OBSOLESCENT.
Detector Unit for 2 pole changeover
405 and 625 line standards. Includes
pegs 16, 32. DD 1967. DD Spec 11.37.
405/625 Standards Detector Unit with 2 separate detectors
like UN20!513 but without power supplier. CHl/43B, pegs
I, 2, 4. DD 1967. DD Spec 11.37. ACO. OBSOLESCENT.
Reference Pulse Detector Unit
conjunction with AM1!572. CH1/l2A.
used in
DD 1968.
C06/504 in
WITHDRAWN.
Chrominance Linearity Detector Unit used
measure chrominance linearity on an ITS.
1969. WITHDRAWN.
in MN2M/S13 to
CH1/43. DD
Differential Gain Detector Unit used in MN2M!5l3 to accept
staircase from UN9/568 and produce a d.c. output
corresponding to the greatest and least amplitudes of
subcarrier. CH1/43. DD 1969. CANCELLED.
Line Store Monitor
detect presence of
Store Converter.
output terminals.
ACO. OBSOLESCENT.
No.2 Detector Unit used in MN2M/5l4 to
signal and pulse in output PA of Line
Also includes integrator and relay
CHl/12A. DD 1969. DD Spec 11.78.
VTR Head Clogging Detector Unit used with video tape
machines in conjunction with UN1!6l2 and PS2/13F to detect
clogging of video record heads. CHl/12A, pegs 45, 64.
DD 1969. DD Spec 7.174. EDI 10070(1)NOV70. OBSOLESCENT.

105