Designs Department Manufacturing Information

DDMI

Manufacturing Information (DDMI) documents were produced for use by Equipment Department, as well as commercial companies that made designs under contract and/or licence. 

DDMIs were printed in small quantities as they were only needed to facilitate manufacture.  As a result, very few appear to be available now.
Here are some examples scanned by Martin Ellen in 2024, after keeping them in a box for many years! (see picture).  Most of them are incomplete as it was not worth scanning full Parts Lists, or large Details and Assembly drawings (which gave mechanical information such as the location of holes in panels). Many of the sheets are faded or "yellowed"!  Circuit diagrams from A1 sheets appear as separate picture files (linked from "Circuit").

If you have DDMIs that you are willing to scan, please let me know so that I could add them to BBCeng.

RADIO FREQUENCY "Wine Press" transposer: AM14-525 DDMI(Spec) 5-175(70) AM14-539 DDMI 5-211 (71) AM14-540 DDMI 5-209 (71) AM14-541 DDMI 5-210 (71), Circuit AM14-542 DDMI 5-211 (71) EP7-514 DDMI 5-241 (73) FL2-538 DDMI-5-238 73) FL2-546 DDMI 5-228 (72) FL2-548 DDMI 5-239 (73) MN2-522 DDMI(Spec) 5.213 (71) OS3-503 DDMI 5-226 (72), Circuit OS3-503 DDMI(Spec) 5-226 (72) OS3-505 DDMI 5-225 (72) PS2-74 DDMI(Spec) 5-143 (68) UN24-501 DDMI 5-232 (72) UN3-540 DDMI 5-214 (71) UN3-541 DDMI 5-212 (71), Circuit UN3-547 DDMI 5-227 (72) "Blue Streak" UHF transposer: AM14-555 DDMI 5.297(75), Circuit FL2-558 DDMI 5.347(77) "Silver Streak" UHF transposer: AM14-561 DDMI 5-393(81), Circuit AM21-506 DDMI 5-400(81), Circuit AM4-535 DDMI 5-399(81), Circuit FL2-565 DDMI 5-405(81) OS3-509 DDMI 5-401(81), Circuit (PCB1 & 2), Circuit (PCB 3) OS3-509A DDMI 5-406(82) PA1M-579 DDMI 5-403(81) PS4-8 DDMI 5-402(81) TM4M-502 DDMI 5-404(81), Layout, Block diagram, Circuit TM4M-503 DDMI 5-394(81), Assembly "RF Test Set" UHF Test Equipment: OS2-526 DDMI 5-273(74), Circuit OS3-507 DDMI 5-258(74), Circuit Amplifiers for HF transmitter drives: AM14-12 DDMI(Spec) 5-187(70) AM14-13 DDMI(Spec) 5-185(70)   DIGITAL ADC for remote monitoring via Automatic Fault Reporter: CO8-5_DDMI_6-336_78, Circuit Digital test generator for VHF radio transmitter network: GE7-1 DDMI 6-286(76), Circuit   AUDIO Audio delay and dispersion equipment: EP1M-23_DDMI-6-333(78) EQ3-35_DDMI-6-334(78) MN4-6_DDMI_6-335(78) UN14-12_DDMI_6-332(78) O.B. line equalisers: EQ3-25_DDMI_ 6-310(77) EQ3-33_DDMI_6-294(77), Circuit EQ3-34_DDMI_6-309(77) Telephone equipment: OS2-47_DDMI_6.307(77) OS3-10_DDMI_6-308(77), Circuit UN10-42_DDMI_6-305(77)

These documents have now been recycled.