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russell_w_b · 13th Nov 2017, 10:51 pm

Hmmm... Wonder if the RF suppression cap is OK or S/C? This is a 0.1uF cap that shunts the mic and prevents it being used as a demodulator of strong RF from nearby transmitters, and is contained in the same can as the bell capacitor.

With the mic removed and disconnected, what sort of resistance do you measure across terminals T4 and T5 on the telephone connecting block?

13th Nov 2017, 10:51 pm	#13
russell_w_b Dekatron Join Date: Jul 2007 Location: Penrith, Cumbria, UK. Posts: 3,687	Re: GPO 332 transmitter issue Hmmm... Wonder if the RF suppression cap is OK or S/C? This is a 0.1uF cap that shunts the mic and prevents it being used as a demodulator of strong RF from nearby transmitters, and is contained in the same can as the bell capacitor. With the mic removed and disconnected, what sort of resistance do you measure across terminals T4 and T5 on the telephone connecting block? __________________ Regds, Russell W. B. G4YLI.