FL4
FL4/503
FL4/504
FL4/505
FL4/506
FL4/507
FL4/507A
FL4/508
FL4/508A
FL4/508B
FL4/5l0
FL4/511
FL4/5l2
FL4/5l8
FL4/5l8A
FL4/520
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DD 1957/61. DDHB 6.28. OBSOLESCENT.
4.85kc/s filter fitted in units used on transatlantic
cable
film
equipment.
DD 1957/61.
DDHB 6.256.
OBSOLESCENT.
3.5kc/s filter used on transatlantic cable film equipment.
DD 1957/61. OBSOLESCENT.
2 video frequency lowpass filters mounted on CH/49
chassis. DD 1957/61. OBSOLESCENT.
8kc/s filter used on transatlantic cable film equipment.
DD 1957/61. DDHB 6.254. OBSOLESCENT.
Filter, Lowpass, Link, 3.2Mc/s, PO design for use in sine
squared pulse and bar acceptance testing method.
DD 1957/61. DD Spec 9.14. OBSOLESCENT.
As FL4/507 but with CH1/12B chassis. DD 1957/61.
DD Spec 7.19. OBSOLESCENT.
Linear Phase Lowpass Filter,
equipment. Fitted with flanges
flying leads and the two ends
DD Spec 9.22. OBSOLESCENT.
5MHz,
and
of
used with 625 line
coaxial adaptors for
the box. DD 1961.
As FL4/508 but fitted with flanges and fixed Musa plugs.
DD 1961. OBSOLESCENT.
As FL4/508 but fitted with hank bushes for fixing at one
end and coaxial adaptors for flying leads in one side of
the box. DD 1961. OBSOLESCENT.
Basis Lowpass Filter used in Band I receiving circuits.
Comprises box and printed cards less components. Serial
numbers indicate particular arrangement of components and
cut off frequency. DD 1962. DD Spec 5.62. OBSOLESCENT.
Filter, Lowpass, Link, 5.3MHz. Used where a phase
compensated bandwidth restriction of 5.3MHz is required.
184mm x 70mm x 102mm. DD 1962. DD Spec 9.26. ACO.
OBSOLESCENT.
Filter, Lowpass, Link, 5.8MHz. Similar to FL4/511 but for
5.8MHz
bandwidth.
DD 1962.
DD Spec 9.27.
ACO.
OBSOLESCENT.
Link Filter,
WITHDRAWN .
4.9MHz, used in C06/501.
DD 1964.
Replaced by FL4/522A. DD 1964. CANCELLED.
Lowpass Filter used in MD1/503A operating on 625 line
vision with FM sound to reject second harmonic components
of the vision carrier. Printed board. DD 1964.
DD Spec 4.49. ACO. OBSOLETE.

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