FL4
FL4/556F
FL4/558
FL4/559
FL4/560
FL4/561
FL4/562
FL4/564
FL4/565
FL4/566
FL4/567
FL4M/569
FL4/570
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Lowpass Phase Corrected Filter, 2.8MHz, used in UN1/597 in
C06/504. Printed board. DD 1968. WITHDRAWN.
Lowpass Phase Corrected Filter, 3.l2MHz, 75~, used on the
405 line output of C06/501. FL4/556C mounted in CHl/12A,
pegs 7, 21 as for FL4/507A. DD 1967. ACO. OBSOLESCENT.
Lowpass Phase Corrected Filter, 4.8MHz, 75~, used on the
625 line input of C06/50l. FL4/556D mounted in CHl/12A,
pegs 8, 23 as for FL4/5l8A. DD 1967. DD Spec 7.136.
ACO. OBSOLESCENT.
Luminance and Chrominance Lowpass Filter used for the
luminance and chrominance outputs of PAlM/547 in C06/504.
Contains a 5.9MHz lowpass filter and a 3.58MHz bandpass
filter. CHl/12A. DD 1968. WITHDRAWN.
Q Signal Lowpass Filter used in PAlM/545 on C06/504 to
filter and delay the Q signal from the chrominance line
store converters. CH1/l2A. DD 1968. WITHDRAWN.
I Signal Lowpass Filter used in PAlM/545 on C06/504 to
filter and delay the I signal from the chrominance line
store converter. CH1/12A. DD 1968. WITHDRAWN.
Linear Phase Lowpass Filter, 3.6MHz, used in C06/50lA for
chrominance rejection, encoded signal. Electrically as
FL4/550. Fitted in PA1/516B. CHl/12A. DD 1969.
WITHDRAWN .
Phase Corrected Lowpass Filter, 3.58MHz, 75~, first used
in C06/507. CH1/12A, pegs 45, 59. DD 1969. WITHDRAWN.
Lowpass Filter, 12MHz, 75~ used in
Gaussian characteristic with cut
Printed circuit board 5lmm
DD Spec 2.336. ACO. OBSOLESCENT.
CD2M/505 and CD3M/504.
off frequency 12MHz.
x 38mm. DD 1970.
Comprises 3 FL4/556A for band
BA10/501. CH1/12A, pegs 48, 73.
OBSOLESCENT.
limitation to 5.5MHz in
DD 1971. DD Spec 7.221.
Phase Corrected 3MHz Lowpass Filter, comprising FL4/556
and adjustable 155ns delay line linked by an attenuator
network. CH1/12A. DD 1971. OBSOLESCENT.
Lowpass Filter used
CD2M/508 and Decoder
lllmm x 225mm with
positions 15, 17, 29.
in ruggedised Sound in Syncs Coder
CD3M/515. Printed circuit board,
33 way ISEP connector. Indexing
RD 1972. OBSOLESCENT.

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