MDOl0003 MDl/3A
MD010006 MDl/6
MD010007 MDl/7
MD0105ll MDl/5!1
MD02000l MD2/l
MD0205ll MD2/5ll
MD2/511A
MD030009 MD3/9
Subcarrier Modulator.
frequency is 27.lkHz.
As for MDl/3, except
DD 1978. DDMI 2.455(81).
output
76kHz DPSK Modulator. This unit accepts serial data and
clock inputs, and generates a 76kHz differential phase-
shift keyed signal. Two isolated outputs are provided
which, with appropriate series resistors, are suitable for
bridging 75Q or 600Q circuits. CHl/63. DD 1977. DDMI
2.446(81).
VHF Stereo Modulator. VHF Stereo Modulator for internal
wired distribution service. Similar to MDl/4, (CH1/12A).
Inputs: High impedance A and B balanced AF
I/P 76 KHz 'Radio Data' I/P.
Outputs: Crystal controlled Band 11 FM carrier
Buffered, coded stereo multiplex.
This unit is intended to be used with Termination Panel
PA20/28. Power requirements mains. CH1/64A. DD 1982.
DDMI 5.425(83). EDI 10474 (1) NOV 83. HB 5.163(83).
V.H.F. Sound and Vision Modulator. The unit accepts video
and sound at standard level and produces a modulated V.H.F
crystal controlled signal (vestigial side band) suitable
for conversion to any television channel for feeding
commercial colour and monochrome television receivers.
Vision
carrier
frequency
38.9
MHz.
Sound
carrier
frequency = 32.9 MHz. Power requirements mains. CH1/64A.
Parent equipment MD1/5l0A. DD 1980
RDS Modulator. This unit accepts a standard RDS bit-stream
and converts this into a 57 kHz modulated carrier in
accordance with EBU Spec.No.3244-E. Power requirements 5 V,
0.5 A.
Termination panel PA20/37.
BBC chassis CH1/86.
Parent equipment CD4L/2l. Sub-units MD2/2, DM2/5.
D & E D(A) 1986.
Line Driver and Modulator. This card accepts as its input
serial data from the CD2/520 Serial data coder and provides
a balanced output together with a modulated output suitable
to transmit the data in the reverse direction to a video
signal. The card also accepts 6 bit BCD coded data and
provides 25 outputs to drive LED's to indicate the number
represented by the data. This card together with the
CD2/520 Serial data coder and UN23/655 control panel
interface form the CD2L/5l6 Matrix remote control coder.
Power requirements +5V. 3U standard ISEP. DD 1977. DDMI
8.608(79).
Line Driver and Modulator. This card is the same as the
MD2/5ll but has additional circuitry to provide 39 instead
of 25 output drives for LED's to indicate the channel
number represented by the 6-bit BCD data. Power
requirements +5V at 250mA approx, -5V at 70mA approx. 3U
ISEP. Parent equipment CD2L/5l6. DD 1980.
Frequency Modulator used in TM3M/8. Output frequency in
l05MHz deviated by up to 50kHz. Audio bandwidth is 17kHz.
Printed circuit board 250mm x l45mm. Mounted within
framework of TM3M/8. DD 1976.
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