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Old 23rd Sep 2020, 8:23 am   #1
Jon_G4MDC
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Default Pye Westminster Facility Socket - 15Way D

The connections to this socket came up in a private conversation.

As I could seem to find no way to attach an image to the PM I have decided that it might be of more general interest anyway.

Here you can see that it carries power RX Audio To/From Decoders and TX Audio To/From Encoders. It is intended to be read in conjunction with the W15AM schematic, full document was C/AT00250/1 but my scan of that is much to large to post here.

To clarify,

Pin1 SKC Is Hot Pin of Mic Insert, Pin 4 TX AF is the AF In Pin of Mic Amp.

Pin 7 RX AF is Audio Out to Top of Volume Control, RV2 is Top of Volume Pot.
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Last edited by Jon_G4MDC; 23rd Sep 2020 at 8:31 am. Reason: Explanation of connections
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Old 23rd Sep 2020, 12:30 pm   #2
G8BBZ
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Default Re: Pye Westminster Facility Socket - 15Way D

Hi Jon,
Is the wiring the same for the W15FM? How about for the Olympic?
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Old 23rd Sep 2020, 2:48 pm   #3
CambridgeWorks
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Default Re: Pye Westminster Facility Socket - 15Way D

I think all should be the same as the MH1 module housing was what plugged into them. There was even a dual and triple housing as well.
The MF5AM ( Motafone) had a facility socket fitted as a factory build option. The MF6AM had a hole in the back panel to accept one. It plugged in to a row of pins at the back left corner of RF motherboard. This was the same way they were fitted as an option on the Olympics.
The boot mount Westminster had them, but only as an option on the MC1 miniature control head, the one with a slider volume control.
The Europa only had capacity for an internal module, or special adapter for external 2 way housing.
The module range generic name was "Pyecall".
From memory, if the facility socket is fitted and no connecting plug inserted, it is usual to link pin 1 to 2 and 7 to 8.

That stretched my grey matter from many years ago!
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Last edited by CambridgeWorks; 23rd Sep 2020 at 3:12 pm. Reason: Further info
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Old 23rd Sep 2020, 5:50 pm   #4
Jon_G4MDC
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Default Re: Pye Westminster Facility Socket - 15Way D

Haha well done Robin! I think all the foregoing is correct.

Note that the internal slide switch on the W15AM switch did exactly the same linking Robin described. I think I have seen tinned copper wire pushed in the socket to make those links and then a Red plastic 15wayD cap pushed over the top of the lot to hide the deed. Maybe that was official who knows.

PS - Peter, my W15FM info has no information about a facility socket. I wonder if they were a special fitment which was added if you ordered a specific system code.
Many had a blanking plate (in the same wrinkle blue paint finish as the main wrapper) riveted over the cutout for the 15wayD.

Last edited by Jon_G4MDC; 23rd Sep 2020 at 5:56 pm.
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Old 23rd Sep 2020, 6:16 pm   #5
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Default Re: Pye Westminster Facility Socket - 15Way D

Jon and Peter, i think only the later ones had the facility option. Back in 1968 when I was at Pye Telecom, Cambridge works on production test, the Westminster was quite new. Back then, the microphone had a black fabric covered lead, like the red one fitted to Cambridge and Vanguards. The facility socket came later.
Yes, the wire links were the official ones, but were probably machine formed as they were a good fit and fairly uniform in length.
Probably Securicor orders had an influence on the facility connector for their "Help" message handling services (often with 5 tone Dersyn selcall) and with channel 1 and 2 national service and channel 6 their own security business. No doubt other channels were also allocated.
The AM Olympic was an ideal set for their business with the inbuilt slot for a selcall module. A lot of Olympics also had the external 15 way "D"" facility socket. I don't know why though.
Without going too OT, the 12 channel Olympic tx-rx oscillator module was notorious for intermittent switch contacts. It was sub- miniature though.
Rob
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Last edited by CambridgeWorks; 23rd Sep 2020 at 6:17 pm. Reason: Spelling
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