UK Vintage Radio Repair and Restoration Powered By Google Custom Search Vintage Radio Service Data

Go Back   UK Vintage Radio Repair and Restoration Discussion Forum > Specific Vintage Equipment > Vintage Amateur and Military Radio

Notices

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

Reply
 
Thread Tools
Old 6th Sep 2019, 11:01 am   #1
kkyahoo
Tetrode
 
Join Date: Apr 2014
Location: Essex, UK.
Posts: 64
Default Pye PocketFone crystal spec?

Does anyone have the crystal details and spec for the xtals for the pf1 and pf9? Looking for the series or parallel spec, capacitive loading etc?

Kevin
kkyahoo is offline   Reply With Quote
Old 6th Sep 2019, 2:07 pm   #2
Jon_G4MDC
Heptode
 
Jon_G4MDC's Avatar
 
Join Date: Nov 2015
Location: Welwyn Garden City, Hertfordshire, UK.
Posts: 663
Default Re: Pye PocketFone crystal spec?

PF1 TX is fundamental ~12MHz so parallel and 30pF loading is probably OK.
Fx=Ftx/36
RX is 5th Overtone ~85MHz and series resonant.
Fx= (Frx-10.7)/5

PF9 is much more difficult - AFC on RX and direct FM on TX means the pulling characteristics matter. I think they are 3rd overtone and series resonant but there is more to it than that.
Due to the AFC you can't swap sides with the LO, it has to be Fc-10.7MHz. If you try Fc+10.7 the AFC runs away from the signals. Been there tried that.

Last edited by Jon_G4MDC; 6th Sep 2019 at 2:14 pm.
Jon_G4MDC is online now   Reply With Quote
Old 7th Sep 2019, 7:34 am   #3
kkyahoo
Tetrode
 
Join Date: Apr 2014
Location: Essex, UK.
Posts: 64
Default Re: Pye PocketFone crystal spec?

Thanks Jon
kkyahoo is offline   Reply With Quote
Old 7th Sep 2019, 9:23 am   #4
Jon_G4MDC
Heptode
 
Jon_G4MDC's Avatar
 
Join Date: Nov 2015
Location: Welwyn Garden City, Hertfordshire, UK.
Posts: 663
Default Re: Pye PocketFone crystal spec?

After a little bit more checking of the facts...

PF8 (RF same as PF9 I'm sure you know) uses ~48MHz crystals.
These are 3rd overtone and series resonant to the best I know.

Transmitter Fx=Ftx/9
Receiver Fx = (Frx-10.7)/9

I might have a handbook somewhere which would give the Pye crystal spec.
That would read something like T36S or some such. If you have crystals already fitted in the Green & Red frequency modules there is a good chance it is stamped on them.

Hy-Q next to Whittlesford Station knew what those specs meant in terms of oscillator loading and pulling.

It is possible that Quartslab know them too - I know for sure they have the PF1 information and have made very many. Some frequencies used to be stocked.
I don't know what they know about PF8 & 9.

Last edited by Jon_G4MDC; 7th Sep 2019 at 9:31 am.
Jon_G4MDC is online now   Reply With Quote
Old 7th Sep 2019, 9:38 am   #5
Scimitar
Heptode
 
Scimitar's Avatar
 
Join Date: Oct 2015
Location: Gloucestershire, UK.
Posts: 519
Default Re: Pye PocketFone crystal spec?

I'm sure that I have a pair of PF1 spec crystals for 70cm somewhere here abouts, if they might help in some way?
Scimitar is offline   Reply With Quote
Old 7th Sep 2019, 1:29 pm   #6
kkyahoo
Tetrode
 
Join Date: Apr 2014
Location: Essex, UK.
Posts: 64
Default Re: Pye PocketFone crystal spec?

Yes if you want to sell them I might be interested.
kkyahoo is offline   Reply With Quote
Old 9th Sep 2019, 11:25 am   #7
Scimitar
Heptode
 
Scimitar's Avatar
 
Join Date: Oct 2015
Location: Gloucestershire, UK.
Posts: 519
Default Re: Pye PocketFone crystal spec?

Here is what I have...

A pair for SU20, a pair for 452.850, One for HO56 and a TX for HO77. May have matching pairs if I look a bit harder.

Not sure what the unlabeled ones are.

I also have a pair for an MF6AM on 70.260, although I appreciate they are no use for the PF1.
Attached Thumbnails
Click image for larger version

Name:	IMG_4042.jpg
Views:	19
Size:	58.0 KB
ID:	189749  
Scimitar is offline   Reply With Quote
Old 15th Sep 2019, 1:41 pm   #8
kkyahoo
Tetrode
 
Join Date: Apr 2014
Location: Essex, UK.
Posts: 64
Default Re: Pye PocketFone crystal spec?

Sent you a private email about the crystals Scimitar,

Kevin
kkyahoo is offline   Reply With Quote
Reply

Thread Tools



All times are GMT +1. The time now is 7:58 pm.


All information and advice on this forum is subject to the WARNING AND DISCLAIMER located at https://www.vintage-radio.net/rules.html.
Failure to heed this warning may result in death or serious injury to yourself and/or others.


Powered by vBulletin®
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Copyright ©2002 - 2019, Paul Stenning.