GE070006 GE7/6

GE070007 GE7/7

GE070008 GE7/8

GE070009 GE7/9

GE7/9A

GE070010 GE7P/I0

Digital Timecode Generator. Crystal oscillator driving a

seven day digital clock with output in serial form on

5 pairs. May be set by thumbwheels, or automatically from

a MSF receiver. Seconds are synchronised to the Gents

clock system. Power requirements 5V d.c. lA. CHl/64D. DD

1978.

MSF Clock. This equipment receives, via an RCl/22,

demodulated time code data from the 60kHz frequency

transmission of MSF, Rugby. This data is decoded and used

to reset an internal clock every minute. Extensive checks

are made on the incoming data to eliminate erroneous

setting of the clock which free-runs using an internal

crystal reference when the Rugby signal is absent or in

error. The internal clock has a calendar correct to the

year 2100 and unpredictable events such as BST/GMT changes

are implemented on receipt of the MSF data. The current

date/time is displayed on a front panel indicator and is

available multiplexed onto a l6-bit parallel outpu t. The

unit is designed to supply date/time information to the

CEEFAX origination equipment. Power requirements Mains,

50VA maximum. lU high bay mounting chassis. DD 1978.

Signal Generator. This unit generates three digital

signals. Two are sampled sine waves, the other a pseudo

random sequence. Power requirements +5V. CHl/54J. Parent

equipment TM4/3. RD 1978.

NICAM 3 Multiplexer. This unit extracts PCM signals from

up to three (plus spare) CD2M/17's and multiplexes them

into a 2048kbit/s bitstream in HDB3 form. It provides

l6MHz clock signals to three CD2M/17's. Power

requirement +5V at 200mA, +18V at 55mA, -18V at 135mA.

CHl/64J.

Parent

equipment

CD2M/17.

DD

1980.

DDMI

6.377(80). DDHB 6.222(83).

NICAM 3 Multiplexer. This unit can multiplex PCM signals

in two ways. The first is applied with the NICAM 3

insertion equipment CD2/23 Options 3,4 and 5. The unit is

provided with 2048 kbit/s NRZ bitstream containing X,Y and

Z 'stereo' bitstreams. The X,Y or Z bitstreams can be

'overwritten' by either a local or remote coder bitstream.

It generates a 2048 kbit/s bitstream in HDB3 form. The

second application is when it is used in the NICAM 3 coder

CD2M/17A. It extracts PCM signals from up to three

CD2M/17's (plus reserve) and multiplexes them into a 2048

kbit/s bitstream in HDB3 form. This unit also provides the

NICAM 3 16MHz system clock. Power requirements +5V at

200mA; +18V at 100mA. -18V at 100mA. CHl/64J. Supersedes

GE7/9. Parent equipment CD2M/23 Options 3,4 and 5,

CD2M/17A. DD 1981. DDHB 6.223(83). EDI 10458(1) AUG 82.

Data Generator. For use with HP 1645A Data Error Analyser

to test data transmission links. The equipment consists of

a Coder and Power Supplier contained in a portable carrying

case. The power supply is 230V AC via a flying lead ending

in a domestic 3-pin mains plug. Power requirements 230V

AC. Carrying case CS2/27C. Sub-units PS2/187D and CD2/22.

DD 1980.

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