FLl/24
FLl/26
FLl/27A,27B
FLl/28
FLl/28A
FLl/32
FLl/33
FLlM/34
FLl/35
FLlM/35
FLl/37
FLl/38
FLl/39
FL 1/ 40
- 129 -
FLl
circuits to suppress longitudinal interference.
board 45mm x 19mm. DD 1967. OBSOLESCENT.
Printed
3dB Directional Filter, Bands IV and V. Copper tape on
printed board, dural plates, 4 type C connectors.
Originally coded FL5/3. DD 1966. OBSOLESCENT.
3dB Directional Filter, Bands IV
boards in chassis simular to
connectors. DD lS67. OBSOLESCENT.
and V .
CHl/44
Two
with
printed
type C
Directional Filter, 3dB, Bands IV and V. A = BNC
connectors; B = B~C cable end adaptors. CH1/45. DD 1967.
OBSOLESCENT.
Test Filter with ASN/4 and FHP/3A and a 483mm x l40mm
flush mounting parel similar to PN3/4 instead of GPM/3,
with the units mounted on a rear panel. DD 1968.
WITHDRAWN .
Test Filter with ~SN/4 and FHP/3A on a 483mm x l40mm flush
mounting
panel.
Relay operation of 100Hz and 1kHz noise
weighting circuitE. SCPD 1968. OBSOLESCENT.
Sound in Syncs Aldio Bandstop and Pre-emphasis Filter.
CH1/12A, pegs 2S,36. DD Spec 2.325. DDTM 2.196. ACO.
OBSOLESCENT.
Interface Filter used in PA8/284. Combination of
longitudinal and LP filters. Printed board 19mm x 46mm.
DD 1969. OBSOLESCENT.
Sending Carrier Filter used in EP2/2. Updated version of
PA1/26. PNl/15B with FL3/20, FL4/43C, FL4/43F, FL2/9,
AM2/2, fitted in CS2/l8A. DD 1969. DD Spec 2.304.
DDHB 2.184. OBSOl ESCENT .
DD 1969. WITHDRA\oN.
Receiving Carrier Filter used in EP2/2.
of PA1/26. PNl/l:B with FL3/20, FL4/43C,
AM2/2 fitted in CS2/l8A. DD 1969.
DDHB 2.184. OBSOlESCENT.
Updated version
FL4/43F, FL2/9,
DD Spec 2.304.
Directional Filter, 30dB, Bands IV and V for measurement
of return loss at UHF. CHl/45. DD 1969/70. WITHDRAWN.
DD 1969/70. CANCELLED.
Directional Filte1, 28dB, Bands IV and V, used in output
feed of EP7/5ll, EP7/5l2 to feed back a small portion of
power to oper2te the AGC unit. Aluminium/Rexolite
sandwich. DD 1965/70. WITHDRAWN.
Directional Filter, 10dB, Bands IV and V, for measurement
of return loss. CHI/56 with 4 type C connectors.
DD 1970. OBSOLESCENT.

29