FLS/1,2
FLS/3
FLS/4
FLS/S
FLS/6
FLS/501-50S
FL6/l
FL6/2
FL6/3
FL6/4
FL6/5
FL6/6
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FLS
FL5 COMBINING FILTERS
Used at low power VHF/FM Band 11 transmitters to combine
outputs of transmitters into a common aerial. Incorporate
helical resonators. FLS/l is for 87.5Mc/s to 94.8Mc/s and
FLS/2 is for 94.8Mc/s to 100Mc/s. DD 1963. ACO.
WITHDRAWN .
Recoded FL1/24. DD 1966.
4 way Combining Filter for combining
AM14/10 in an AMI4/9. Printed circuit
133mm
base
plate.
DD 1970.
EDI 10086(1)MAY71. OBSOLESCENT.
the outputs of 4
board on 133mm x
DD Spec 5.191.
3 way Combining Filter used in AM14/15 to combine outputs
of three AM14/10. Printed circuit board on 133mm x 133mm
base plate. DD 1970. DD Spec 5.191. EDI 10086(1)MAY71.
OBSOLESCENT.
2 way Combining Filter used in PA1/l7 to combine outputs
of two AM14/9 or two AM14/15. Printed circuit board
normally mounted in BX1/11. DD 1970. DD Spec 5.194.
EDI 10086(1)MAY71. OBSOLESCENT.
Used at low power Band I television transmitters to
combine outputs of vision and sound transmitters into a
common serial. Incorporate helical resonators. Used for
Channels 1 to 5 respectively. DD 1963. ACO. WITHDRAWN.
FL6 SPLITTING FILTERS
Used in
DD 1957.
LS3/1
ACO.
Originally coded FI6/l.
Loudspeaker, O.B.
OBSOLESCENT.
Cross-over Filter used in LS5/1. DD 1960. OBSOLEWCENT.
Used at Bristol on Bristol-London VF Switching System to
split frequency spectrum into two at approximately 1kc/s
for transmission in opposite directions. 483mm x l33mm.
DD 1962. DD Spec 2.20S. OBSOLESCENT.
Cross-over Filter used in LS5/lA. DD 1963. OBSOLESCENT.
Cross-over Filter used in LS1/2.
OBSOLETE.
DD 1963.
ACO.
Band 11 Notch and Splitting Filter used in front of RBR
aerials
at
transmitters
where
three
programmes
are
received and retransmitted on three other frequencies.
Incorporates 18 helical resonators on 3l8mm panel.
DD 1964/66. WITHDRAWN.

43