UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post

G6Tanuki · 11th Oct 2017, 6:59 pm

My 10.7MHz "squawker" was made by using the second-conversion xtal-osc from a water-damaged Pye Westminster [early-1970s cars were notorious for water getting past the door/window seals and someone had installed a Wessie in a Mk.3 Cortina on precisely the place to catch the drips...]

The Wessie 2nd conversion oscillator is on 10.245 or 11.155MHz according to intended frequency-coverage: you wouldn't want a 'birdie' from inside the radio landing on a frequency you were trying to receive].

"Storno" FM two-way gear at the time often used a crystal-discriminator involving a 10.7MHz crystal - so a dead [who killed it by reversing the polarity?] Storno radio yielded up its quartz to be fitted to the Wessie oscillator-board.

My "squawker" was built into one of the 2-outlet bakelite boxes designed for mains sockets. Because I was dealing with quite a few AM radios at the time I included a modulation facility [OC72 transistor and R-C phase-shift oscillator] .

11th Oct 2017, 6:59 pm	#35
G6Tanuki Dekatron Join Date: Apr 2012 Location: Wiltshire, UK. Posts: 14,005	Re: Common Pye PF1 RX deafness problem My 10.7MHz "squawker" was made by using the second-conversion xtal-osc from a water-damaged Pye Westminster [early-1970s cars were notorious for water getting past the door/window seals and someone had installed a Wessie in a Mk.3 Cortina on precisely the place to catch the drips...] The Wessie 2nd conversion oscillator is on 10.245 or 11.155MHz according to intended frequency-coverage: you wouldn't want a 'birdie' from inside the radio landing on a frequency you were trying to receive]. "Storno" FM two-way gear at the time often used a crystal-discriminator involving a 10.7MHz crystal - so a dead [who killed it by reversing the polarity?] Storno radio yielded up its quartz to be fitted to the Wessie oscillator-board. My "squawker" was built into one of the 2-outlet bakelite boxes designed for mains sockets. Because I was dealing with quite a few AM radios at the time I included a modulation facility [OC72 transistor and R-C phase-shift oscillator] .