UN9/553
UN9/554
UN9/555
UN9M/556
UN9/557
UN9/558
UN9/559B
UN9/560
UN9/561
UN9/562
UN9/563
- 385 -
UN9
via an external SOOns delay
and attenutaor. CHl/43.
DDTM 7.75. OBSOLESCENT.
cable and internal equaliser
DD 1967. DD Spec 8.303.
Video Switch Unit used in EP5/507 for group mixer
changeover and application of either of 2 test waveforms
to
mixer
output
distribution
amplifiers.
CHl/12A.
DD 1967.
DD Spec 8.283.
EDI l0035(1)MAR72.
ACO.
OBSOLESCENT.
Video Switch Unit, relay operated, used in PAlM/542 to
by-pass the transcoder. CHl/12A, pegs 14, 44. DD 1967.
DD Spec 11.55. WITHDRAWN.
Automatic Subcarrier Selector Switch Unit used in C06/505
to switch the transmission sub carrier input from station
subcarrier to line related subcarrier when the latter is
within 5Hz of nominal frequency. Includes PS2/22B.
CHl/12A,
pegs
15,
34.
DD 1967.
DD Spec 11.45.
WITHDRAWN .
Video Equalising Switch Units, used to provide inlay
timing in EP5/507. PN3/23 with 16 UN9/552 and associated
delay cables. DD 1968. DD Spec 8.308. OBSOLESCENT.
High Speed No.l Input Switch used
in C06/501A. 36 are mounted with
PA1/S14D. Printed circuit board
DD Spec 7.137. ACO. OBSOLETE.
to sample video signals
UN9/558 in PAl/5l4C,
l02mm x 76mm. DD 1968.
High Speed Pulse Supply Switch Unit used in C06/50lA to
make supply and signal connections to the Input high speed
pulse supply Switch Assembly. Printed circuit board l02mm
x 76mm. DD 1968. DD Spec 7.138. ACO. OBSOLESCENT.
High Speed Output Switch Unit used for voltage sampling in
C06/50lA. 36 are mounted with UN9/560 in PAl/5l4D.
Printed board lm x 76mm. DD 1968. DD Spec 7.139. ACO.
OBSOLESCENT.
High Speed Output Switch Supply Unit used to < ake supply
and pulse connections to the Output High Speed Switch
Assembly in C06/501A. Printed circuit board 102mm x 76mm.
DD 1968. DD Spec 7.140. ACO. OBSOLESCENT.
High Speed Switch Unit for Q-signal channel of C06/504.
Similar to UN9/5l8 and UN9/518A No.l. Printed circuit
board. DD 1968. OBSOLETE,
RF Switch Unit used in C06/S04 for 24MHz carrier switching
by low frequency logic to select delay line outputs in the
field delay equipment. Printed board in l02mm x 5lmm x
26mm box. DD 1968. WITHDRAWN.
Cue Dot Insertion Switch Unit for mounting inside
AM18/5l3B to blank part of the picture as dictated by an
external pulse and add to the picture another external
signal, both external signals being supplied normally by

85