UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Memories and other stories from Pye etc PMR engineers.

Jon_G4MDC · 13th Sep 2017, 7:47 pm

You set me in mind of another one....

In the days of building Canary Wharf there were many high cranes who needed to speak with their banksmen down below... One site was getting lots of grief from something called "Sierra Control" and they reckoned it unsafe to continue. The wooden dollars (cross charges for delay) are bleeding away - fix it - now! now!

The end result was rather nice... There was a 3rd order intermod at RF which meant Ford Car Works Dagenham and something else hit their high RX, ordinarily they wouldn't care because CTCSS (Tone Lock) were different. But not this time.

The Car Works (Sierra Control - Doh!! - lots of DF to discover that) and the 3rd party TX (I don't remember who) had CTCSS which were a 3rd order too. Put it all together as an RF and AF mix and Voila! RF1+/- RF2 +/- CTCSS1+/-CTCSS2 = CRUD!

13th Sep 2017, 7:47 pm	#29
Jon_G4MDC Nonode Join Date: Nov 2015 Location: Welwyn Garden City, Hertfordshire, UK. Posts: 2,015	Re: Memories and other stories from Pye etc PMR engineers. You set me in mind of another one.... In the days of building Canary Wharf there were many high cranes who needed to speak with their banksmen down below... One site was getting lots of grief from something called "Sierra Control" and they reckoned it unsafe to continue. The wooden dollars (cross charges for delay) are bleeding away - fix it - now! now! The end result was rather nice... There was a 3rd order intermod at RF which meant Ford Car Works Dagenham and something else hit their high RX, ordinarily they wouldn't care because CTCSS (Tone Lock) were different. But not this time. The Car Works (Sierra Control - Doh!! - lots of DF to discover that) and the 3rd party TX (I don't remember who) had CTCSS which were a 3rd order too. Put it all together as an RF and AF mix and Voila! RF1+/- RF2 +/- CTCSS1+/-CTCSS2 = CRUD!