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Old 14th Sep 2018, 10:28 pm   #12
Biggles
Rest in Peace
 
Join Date: Feb 2004
Location: Hexham, Northumberland, UK.
Posts: 2,234
Default Re: Telephone style microphone ID req

I may be wrong but I think the Marconi RC690 might have used that combination of plugs and handsets in Police vehicles. The Whitehalls used a square multi pin affair (Jones plug?) which went into the back of the control head. As far as I remember I think the Whitehall may have had a balanced mic input circuit.
Alan.
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