MDl
MD 1/ 503B
MDl/504
MDlM/505
MDl/506
MDlM/507
MDlM/507A
MDlM/507B
MDl/S08
MD1/509
NDl/510
- 188
and FL4/15 or FL4/520.
DD 1964. DD Spec 4.18.
CHl/12A.
DDHB 4.12.
Transistors: 4 2S13l.
ACO. OBSOLETE.
Similar to MD1/503A with crystal oscillator omitted and
drive taken from associated MDl/503A, and with FL2/536,
FL3/S07 or FL4/l5. Used in MDl/S02 for FM sound.
DD 1964. DD Spec 4.18. DDHB 4.12. OBSOLETE.
Used to modify GEl/504 to produce simultaneous NTSC and
PAL type sub-carriers. CH1/l2A with balanced modulator
and bandpass filter to separate the sum of the input
frequencies. DD 1965. WITHDRAWN.
Wideband Sound and Vision Modulator for 405 line system.
Positive vision modulation, AM sound. CHl/33 with
UN13/502A, 2 MDl/506, AT2M/9A in CS2/llA. DD 1967.
DD Spec 4.31. OBSOLETE.
Similar to MDl/503C but with coaxial socket fitted to the
RF
unit.
Part
of
MDlM/505.
CHl/12A,
pegs
15,
39.
DD 1967. DD Spec 4.32. OBSOLESCENT.
Wideband Sound and Vision Modulator providing a complete
62S line television system with negative video and FM
sound modulation on any channel in Band IV or V. PN3/23
with MD1/S03A, MDl/S03B, MD3/502, MXl/509A or MXl/509B,
OS2/S11, PSl/2S, UN13/S02B, UN15/503, FL4/14 (printed
board
only),
AT4/512A.
DD 1969.
DD Spec 4.52.
EDI 10019AUG69. ACO. OBSOLESCENT.
As MDlM/507 but with UHF output at rear instead of front
(MX1/509C or MXl/509D in place of MX1/509A or MX1/509B).
DD 1969. OBSOLESCENT.
Used in
OS2/511.
Bands I, 11 and III by omitting MX1/509
DD 1969. OBSOLESCENT.
and
Wideband Sound and Vision Modulator for Band IV UHF.
Modulator domestic quality only. Accepts composite video
and standard sound. Internal grille and black level
generator. Mains operated. Modified Decca Convergator
Unit. Plastic box, 140mm x 89mm x 63mm. DD 1970.
DD Spec 5.182.
DDTM 5.60.
EDI 10051(1)AUG70.
OBSOLESCENT.
Shading Corrector Modulator used to modulate a signal to
correct for the sensitivity variation in a p1umbicon tube
and dichroic tilt
in
optical
system.
Associated
with
UNl/629. Printed board 57mm x 76mm. DD 1970. WITHDRAWN.
Wideband Sound and Vision Modulator, producing a VHF
$1gna.1.
CH1!12A.
DD 1972.
DDMI 5.292.
EDt 10169(1)MAR75. OBSOLESCENT.

88