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Vintage Amateur and Military Radio Amateur/military receivers and transmitters, morse, and any other related vintage comms equipment.

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Old 8th Mar 2019, 2:20 pm   #1
GSBX1220
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Default Pye /Philips desk microphone info req

Hi folks.

I need some info on the desk mic as pictured in the attachment.

I thought it would make a nice desk mic for my Yaesu FT 890. I opened it for a bit if a look see so I could figure out the wiring.

Problem is, a couple of springs fell out which Are for the PTT bar as it is now not positive and does not activate the microswitch properly.

Problem is for the life of me I cannot figure out where they go.

Anyone know, or have a manual for this which shows the locations of the springs, and the wiring?

Cheers
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Old 8th Mar 2019, 7:12 pm   #2
SiriusHardware
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Default Re: Pye /Philips desk microphone info req

There is a strong possibility that I have one of these stashed deep in the loft, as I had a bit of a Pye/Philips phase in the Earliest days of my being an amateur and I bought quite a few fist microphones, both the conventional and 'shaver' type, but I am almost sure I have one of these as well.

Give it a little while and if no-one else comes back to you with relevant information I'll see if I can find it and (carefully!) take it apart. Of course if you'd asked here first we could have told you what the wiring is: Then your PTT switch would still be intact. (Not helpful, I know).

For the fist microphone the wiring is as follows:
Pin 1: Red, Audio Signal
Pin 2, Green, Audio Screen
Pin 5, White, 10V regulated in from transceiver
Pin 3, Blue, 10V PTT to transceiver switched by PTT switch

Note that in versions of the fist microphone which use an electret microphone the power for the electret is derived from the +10V supply. This may also be the case for the desk microphone.

Last edited by SiriusHardware; 8th Mar 2019 at 7:25 pm.
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Old 8th Mar 2019, 9:30 pm   #3
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Default Re: Pye /Philips desk microphone info req

Hi

Thanks. Yes, I should have taken far more care had I engaged my brain first I would not be in this position.

One of the springs dropped out from around the board area when I removed the board. This is the one at the moment I'm not sure about.
The other spring I think it maybe goes between the base and the horizontal PTT and possibly held in place vertically by one if the front crews coming up through the base.

Attached is a couple of photos of the board. Wiring colours are different to mentioned above, but no doubt there are many versions if this.
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Old 8th Mar 2019, 10:06 pm   #4
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Default Re: Pye /Philips desk microphone info req

Plug pinout, as viewed like a clock dial number positions with the gap at the bottom (6 o'clock), from the solder side, to correspond with the names (not colours) given by siriushardware
7 = pin 1, 9/10 = pin 2, 12 = pin 3, 2/3 = pin 4, 5 = pin 5
I also have a mic, but currently my garage is a no-go area due to imminent building work. Fairly recently I also saw the small A5 size service document booklet, but no idea where it is buried now unfortunately.
Yes, these are electret mics. There are small component differences between the am and fm version, but the insert is the same. Often a small printed id sleeve is fitted on the cable.
Rob
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Old 8th Mar 2019, 11:16 pm   #5
Martin G7MRV
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Default Re: Pye /Philips desk microphone info req

If I remember correctly, the PTT lever is able to be activated from either end, so you can press the horizontal section with it on the desk, but you can also lift the whole mic and press the upper section, more like a fist mic. So there would be two springs, one at either end of the curved lever. Look at the lever itself, there should be a mounting of some sort for the spring at either end.

I may be thinking of an entirely different model of course! Its been over 15years!
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Old 9th Mar 2019, 10:08 am   #6
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Default Re: Pye /Philips desk microphone info req

Yes, it is a two operating position sprung paddle arrangement.
Rob
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Old 9th Mar 2019, 2:58 pm   #7
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Default Re: Pye /Philips desk microphone info req

I found a mic! The springs each go between the pcb and the case, with the screws running through them.
This allows the "floating" position of the pcb (with microswitch attached) to be positioned for balanced operation depending whether the top or bottom paddle is pressed. The spring return to off is provided only by the microswitch.
Rob
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Old 9th Mar 2019, 5:06 pm   #8
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Default Re: Pye /Philips desk microphone info req

Thanks Rob.

I'll have a look at that tomorrow. Sort of makes sense why the springs would be there.
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Old 11th Mar 2019, 12:17 am   #9
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Default Re: Pye /Philips desk microphone info req

Hi

Sorted! Thanks. Springs now in original and correct position!

Does anyone have a cct diagram for the board inside?

Cheers

Richard
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Old 11th Mar 2019, 8:52 am   #10
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Default Re: Pye /Philips desk microphone info req

Hi Richard,
I was moving some things on top of my bookcase prior to arrival of builders this morning and I found the small handbook.
Pm me your email address and I will scan it all ( only a few pages) and create a pdf for you later today hopefully.
Rob
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Old 11th Mar 2019, 10:55 am   #11
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Default Re: Pye /Philips desk microphone info req

Here is an image of the circuit. Note the links for am/fm
I have created a pdf as well, available by email if you pm me.
Rob
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Old 11th Mar 2019, 12:12 pm   #12
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Default Re: Pye /Philips desk microphone info req

Hi

Thanks. That was very kind. I have sent a PM with my email address.
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