Pye shaver mic timeout - UK Vintage Radio Repair and Restoration Discussion Forum

Jeremym0xvf · 9th Jan 2016, 6:43 pm

Hello group,

I have an old Pye shaver mic in use on my M293, and I would like to disable the timeout as I like to waffle on a bit. I have had a look inside and wonder if someone could point me in the right direction.

Many thanks

Jeremy

9th Jan 2016, 8:10 pm

What is an M293?

AC/HL · 9th Jan 2016, 8:25 pm

It's a Pye mobile radio: http://www.pmrconversion.info/manuals/pye/M293.pdf
This one has a different microphone, the "shaver" nickname is a play on it's appearance, as with the "Toaster" radio.

G6Tanuki · 9th Jan 2016, 8:33 pm

See here:

http://www.peel.dk/AP/pdf/PYE%20M296.pdf

and scroll down to page 32. Shorting "C1" [the 33uf electrolytic] should kill the timeout.

Alternatively, junk the timeout-module entirely.

Page 43 shows the non-timered mic wiring. Remember that the "shaver" mic is an electret insert so needs DC to power the insert.

Biggles · 9th Jan 2016, 8:37 pm

I would have thought the timer would be a function of the main PCB in the radio with a link perhaps to alter/ disable the timer. Saying that, as it was designed as a PMR set, there may not be a user disable, so you may have to modify the PCB. I used to work on M294 FM sets but can't remember the timeout adjust. If the M294 is similar to the M293 I have the circuit for the 294 so may be able to point you in the right direction.
Alan.

Jeremym0xvf · 9th Jan 2016, 10:27 pm

Thank you for the replies,after another inspection I had thought shorting C1 would disable the timeout and will do it tomorrow morning.Just in case anyone is interested I use Pye westminsters, MX 294,293 and various Storno and Tait radios on amateur bands both AM and FM
Thanks again
Jeremy

g0hze snowy · 9th Jan 2016, 11:15 pm

the m293 is an AM set, 6 position crystal control set. the mx are eprom controlled

Biggles · 10th Jan 2016, 4:30 pm

I am a licensed amateur too and use a Key KM150 converted for 2M. It only has sixteen channels but that is enough for the repeaters around here. It was "saved" from the scrap heap at work many years ago and all it needed for conversion was an eprom reprogram and retune. It's a good set and doesn't draw too much attention in my latest job as it blends in with all the other PMR stuff. I don't think it's generally viable to convert crystal controlled sets unless you are really keen!
Alan.
M1CEU.

Jeremym0xvf · 10th Jan 2016, 8:17 pm

Cap shorted and timout disabled,brilliant

I have had a KM 150 on 2m I thought it was a good set, gave it away to someone starting out in the hobby.Also had a Key KM 80 on 4m FM which was very sensitive, good audio and 30W out-a useful radio.
As you say the price of crystals usually puts paid to some conversions, but some are worth it I think. A lot of my kit is older than me (1973 vintage) and is in use pretty much every day , I like to keep older stuff going and repair radios etc for friends, its a big part of the hobby(Ham radio) for me

Thanks again for the helpful comments,

Jeremy

Biggles · 11th Jan 2016, 12:40 am

There's a lot to be said about the simplicity of ex PMR utility sets. No multi layer menus and SMD components. Volume, on-off, channel change and mute. That's all you need. I'm aware this is wandering well off topic now so I'd better sign off. Feel free to contact me if you think I can help you out with Pye/Philips/Motorola PMR sets.
Alan.

9th Jan 2016, 6:43 pm	#1
Jeremym0xvf Diode Join Date: Jan 2016 Location: County Durham, UK. Posts: 7	Pye shaver mic timeout Hello group, I have an old Pye shaver mic in use on my M293, and I would like to disable the timeout as I like to waffle on a bit. I have had a look inside and wonder if someone could point me in the right direction. Many thanks Jeremy

9th Jan 2016, 8:10 pm	#2
Guest Guest Posts: n/a	Re: Pye shaver mic timeout What is an M293?

9th Jan 2016, 8:25 pm	#3
AC/HL Dekatron Join Date: Nov 2003 Location: Heckmondwike, West Yorkshire, UK. Posts: 9,642	Re: Pye shaver mic timeout It's a Pye mobile radio: http://www.pmrconversion.info/manuals/pye/M293.pdf This one has a different microphone, the "shaver" nickname is a play on it's appearance, as with the "Toaster" radio.

9th Jan 2016, 8:33 pm	#4
G6Tanuki Dekatron Join Date: Apr 2012 Location: Wiltshire, UK. Posts: 14,007	Re: Pye shaver mic timeout See here: http://www.peel.dk/AP/pdf/PYE%20M296.pdf and scroll down to page 32. Shorting "C1" [the 33uf electrolytic] should kill the timeout. Alternatively, junk the timeout-module entirely. Page 43 shows the non-timered mic wiring. Remember that the "shaver" mic is an electret insert so needs DC to power the insert.

9th Jan 2016, 8:37 pm	#5
Biggles Rest in Peace Join Date: Feb 2004 Location: Hexham, Northumberland, UK. Posts: 2,234	Re: Pye shaver mic timeout I would have thought the timer would be a function of the main PCB in the radio with a link perhaps to alter/ disable the timer. Saying that, as it was designed as a PMR set, there may not be a user disable, so you may have to modify the PCB. I used to work on M294 FM sets but can't remember the timeout adjust. If the M294 is similar to the M293 I have the circuit for the 294 so may be able to point you in the right direction. Alan.

9th Jan 2016, 10:27 pm	#6
Jeremym0xvf Diode Join Date: Jan 2016 Location: County Durham, UK. Posts: 7	Re: Pye shaver mic timeout Thank you for the replies,after another inspection I had thought shorting C1 would disable the timeout and will do it tomorrow morning.Just in case anyone is interested I use Pye westminsters, MX 294,293 and various Storno and Tait radios on amateur bands both AM and FM Thanks again Jeremy

9th Jan 2016, 11:15 pm	#7
g0hze snowy Hexode Join Date: Oct 2013 Location: Peterborough, Cambridgeshire, UK. Posts: 336	Re: Pye shaver mic timeout the m293 is an AM set, 6 position crystal control set. the mx are eprom controlled

10th Jan 2016, 4:30 pm	#8
Biggles Rest in Peace Join Date: Feb 2004 Location: Hexham, Northumberland, UK. Posts: 2,234	Re: Pye shaver mic timeout I am a licensed amateur too and use a Key KM150 converted for 2M. It only has sixteen channels but that is enough for the repeaters around here. It was "saved" from the scrap heap at work many years ago and all it needed for conversion was an eprom reprogram and retune. It's a good set and doesn't draw too much attention in my latest job as it blends in with all the other PMR stuff. I don't think it's generally viable to convert crystal controlled sets unless you are really keen! Alan. M1CEU.

10th Jan 2016, 8:17 pm	#9
Jeremym0xvf Diode Join Date: Jan 2016 Location: County Durham, UK. Posts: 7	Re: Pye shaver mic timeout Cap shorted and timout disabled,brilliant I have had a KM 150 on 2m I thought it was a good set, gave it away to someone starting out in the hobby.Also had a Key KM 80 on 4m FM which was very sensitive, good audio and 30W out-a useful radio. As you say the price of crystals usually puts paid to some conversions, but some are worth it I think. A lot of my kit is older than me (1973 vintage) and is in use pretty much every day , I like to keep older stuff going and repair radios etc for friends, its a big part of the hobby(Ham radio) for me Thanks again for the helpful comments, Jeremy

11th Jan 2016, 12:40 am	#10
Biggles Rest in Peace Join Date: Feb 2004 Location: Hexham, Northumberland, UK. Posts: 2,234	Re: Pye shaver mic timeout There's a lot to be said about the simplicity of ex PMR utility sets. No multi layer menus and SMD components. Volume, on-off, channel change and mute. That's all you need. I'm aware this is wandering well off topic now so I'd better sign off. Feel free to contact me if you think I can help you out with Pye/Philips/Motorola PMR sets. Alan.