FL2/l
FL2/2
FL2/3
FL2/4
FL2/4A
FL2/6
FL2/7
FL2/8
FL2/9
FL2/10A-C
FL2/l3
FL2/501
FL2/502
FL2/503
FL2/504
FL2/505
- 131
FL2
FL2 BAlrDPASS FILTERS
Bandpass Filter (350c/s-4000c/s) used on Radio Camera
Communication Conl:rol Panel. DD 1969. OBSOLESCENT.
Used in AMl/6
outside nominal
CHl/18C. DD 1963
LO remove products of harmonic distortion
telephone bandwidth of 280c/s-3650c/s.
ACO. WITHDRAWN .
Switchable BP Fi:.ter for use in overseas countries to
eliminate 5kc/ s lleterodynes and introduce some bass cut.
Provides (a) BP f:.lter. 104c/s to 5kc/s or (b) l47c/s to
3.4kc/s. Balanced 600n circuit. 483mm x l33mm. DD 1963.
DD Spec 2.214. OBSOLESCENT.
BP Filter, 10.7Mc,'s used in IF section of FM translators
either alone or ~.th FLl/15. Printed boards in copper
box. DD 1964. DJ) Spec 5.74. ACO. OBSOLETE.
Similar to FL2/4 hut with slightly wider pass band for use
in stereo broadcao ting. DD 1967. TI. OBSOLESCENT .
Used in MN2M/l 1:0 exclude programme and include a binary
tone signal in a designated pass band of frequencies.
CHl/l8C. pegs 2:~, 29. Replaced by FL3/8 in later
equipment. DD 1%5. DD Spec 5.105. OBSOLESCENT.
Bandpass Filter, :.65Hz-190Hz used in PAlM/57. CHl/18C.
pegs 5. 30. DD I! '6 7. WITHDRAWN.
Bandpass Filter lIsed to prevent unwanted intermodulation
products reaching DM3/l. CHl/12A. DD 1968. WITHDRAWN.
Bandpass Filter 96kHz to l3.5kHz, used in OTl/3. Printed
circuit board. DD 1969. DD Spec 2.304. DDHB 2.184.
OBSOLESCENT.
Bandpass Filters lIsed in TM3/2A-C, respectively. PNl/6A
with Pye filters . :ype AEFl. DD 1972. OBSOLESCENT .
Bandpass Filter for signalling
discriminate aga:~nst speech
CHl/63. DD 1965. OBSOLESCENT.
systems to pass tones but
and teleprinter bands.
Aerial Filter uSt!d at Snaefell. On CHl/39B. DD 1956/60.
OBSOLESCENT.
Aeda1 Filter for reception of sound on Channel 5.
63.25Mc/s. DD 19:i6/60. OBSOLESCENT.
Used at Rosemarl:ie to receive Channel 4, and reject
Channel 2. DP 19~i6/60. OBSOLESCENT.
Conununications Ae:~:f.al Filter. 42Mc/s. used on television
OB's. (Rowridge 'lrea). DD 1956/60. OBSOLESCENT.
Rebroadcast :~eceiver aerial input
63.25Mc/s-67.25Mc.'s. DD 1956/60. OBSOLESCENT.
filter

31