MA1/1
- 18S -
MAl
MAl MISCELLANEOUS MATRICES
Relay Matrix providing ten way five level reed relay
switching matrix for stereophonic programme routing or
monitoring. Printed circuit board for 133mm ISEP panel
mounting. SCPD 1971. OBSOLESCENT.
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MAl Sub Group not available for new designs DD 1977.
MA2 / 1
MA2M/501A
MA2M/502
MA2M/SOS
MA2 SWITCHING MATRICES
Group Switching Matrix used on Type D sound desks to
provide 4 outputs each of which can be switched to one or
more of 6 group feeds. Also provides 2 sets of isolated
feeds of each of the 6 group inputs. CHl/37B. DD 1969.
DD Spec 3.501. OBSOLESCENT.
As MA2M/50l but without 25 AT3/510 or EQ1/516. Can be
fitted with NE4/514. DD 1968. WITHDRAWN.
Similar to MA2M/501 but for remote pre-se1ection of up to
8 sources from 25 for connection to up to 8 destinations.
Includes 33 cards instead of 37. 483mm x 267mm x 229mm
deep. Includes AM23/503A, AM23/502A as required, and 25
AT3/510 (or EQ1/516 as alternative). DD 1968.
DD Spec 8.361. DDHB 8.269, 8.277. EDI. ACO. OBSOLETE.
Video Switching Matrix similar to MA2M/501 but employing
AM23/504A-D and AM23/508A with AM23/505A as required.
DD 1970. DDMI8.424(72). OBSOLESCENT.
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MA2 Sub Group not available for new designs DD 1977.
MA3/1
MA3/2
MA3 COMBINING MATRICES
Relay Switching Combining Matrix used in EP1M/12 at WRT
terminal of BH-WRT digital switching system to operate
relays to apportion lines to transmitters. Incorporates 5
arrays of 5 diodes. 33 way ISEP plug, coding 3, 7, 21.
DD 1969. CANCELLED.
Similar to MA3/1 but incorporates 2 arrays of 6 diodes,
and 2 arrays or 7 diodes. 33 way ISEP plug, coding 3, 7,
23. DD 1969. CANCELLED.
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MA3 Sub Group not available for new designs DD 1977.

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