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MD3/lA
Variable Inductance Frequency Modulator providing
deviation of up to t125kc/s about centre frequency of
2.6Mc/s. Printed board. Used in UNl/34. DD 1963.
DD Spec 5.69. OBSOLESCENT.
MD3/2
Frequency Modulator replacing MD3/lA. Suitable for stereo
multiplex input or mono input, instead of mono input only.
Used in UN22/l. Printed board. DD 1966. DD Spec 5.l3S.
ACO. OBSOLESCENT.
MD3/3
Frequency Modulator, 10.7MHz, for stereo or mono
operation. Input: At least SOOmV d.a.p. into 7Sr. or
600D, Output: lOOmV into 50D at 10.7MHz of frequency
modulated carrier. CHl/l2A, pegs 31, 37. DD 1969.
DD Spec 5.170. OBSOLESCENT.
MD3/3A
Modified interchangeable version of MD3/3.
OBSOLESCENT.
DD 1971.
MD3/4
Frequency Modulator. As MD3/3, but with balanced input.
CHl/12A. Coding pegs 49, 71. DD 1971. DD Spec 5.230.
DDHB 5.84. OBSOLESCENT.
MD3/5
DD 1972. CANCELLED.
MD3!501
Frequency Modulator used in MD1/502 in conjunction with
C02/510 and UN15/S0l. Accepts audio input and produces
6Mc/s frequency modulated output with correct
pre-emphasis.
CHl/12B.
Transistors:
2N199l, 2N198S, 2
2Sl31. DD 1964. DD Spec 4.23. ACO. OBSOLETE.
MD3/502
6MHz Frequency Modulator used in MDlM/507.
DD 1969. DD Spec 4.53. ACO. OBSOLESCENT.
CHl/ l2A .
l>fD3i503
Sound Frequency Modulator used in TM3/S02. Includes
7.5MHz sound subcarrier modulator, vision pre-emphasis
network, and adding pad. Printed board 432mm x l78mm.
DD 1969. DD Spec 6.153. WITHDRAWN.
~'m3/504
Vision Frequency Modulator used in TM3/S02. Printed board
432mm x 178mm with AM14/S3l, MX1/5l2C and a 70MHz
modulator. DD 1969. DD Spec 6.152. WITHDRAWN.
MEl MISCELLANEOUS MEASURING EQUIPMENT
Meter, Field Strength, Hand (40Mc/s-lOOMc/s) used at
transmitting stations. DD 1963. OBSOLESCENT.
Similar to MEl/l but
OBSOLESCE1'T .
for 3Mc/s-30Mc/s. DD 1963.
Optical Peak Programme Meter with left hand zero for use
as extension meter with ME12/4. DD 1963. OBSOLESCENT.

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