UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - French car boot telephone thing, What is it?

Dave Moll · 5th Jun 2022, 9:03 pm

Certainly, getting the magneto working would be a good start, as you could then check out which switch positions cause the ringing current to appear at which terminals. I would expect the terminals marked "L1" and "L2" to be the extension line pairs, though I'm unclear the purpose of "F1" and "F2". Most likely a 12V battery (connected across "BC") would supply the line current for the extensions (and anything else requiring battery, if anything), but experimentation will determine the optimal voltage.

I note that it appears to have "drop-down" indicators on all circuits rather than "doll's-eye" ones for extensions, so it may require magneto signalling from the extensions.

5th Jun 2022, 9:03 pm	#6
Dave Moll Dekatron Join Date: Feb 2005 Location: West Cumbria (CA13), UK Posts: 6,130	Re: French car boot telephone thing, What is it? Certainly, getting the magneto working would be a good start, as you could then check out which switch positions cause the ringing current to appear at which terminals. I would expect the terminals marked "L1" and "L2" to be the extension line pairs, though I'm unclear the purpose of "F1" and "F2". Most likely a 12V battery (connected across "BC") would supply the line current for the extensions (and anything else requiring battery, if anything), but experimentation will determine the optimal voltage. I note that it appears to have "drop-down" indicators on all circuits rather than "doll's-eye" ones for extensions, so it may require magneto signalling from the extensions. __________________ Mending is better than Ending (cf Brave New World by Aldous Huxley)