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Old 27th Dec 2009, 10:48 am   #29
russell_w_b
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Default Re: Army Field Telephones and Compatibility?

Quote:
Originally Posted by russell_w_b View Post
Quote:
Originally Posted by GMB View Post
Also, what a/c voltage does the magneto ringer generate e.g. on a Type F?
Generator O/C voltage = 120V RMS.
Generator S/C Current = 96mA RMS.

But typically 78V RMS at 34mA into a 1000R bell-set (measured with Fluke 87V true RMS meter), cranked over at about 17Hz.
By comparison, a Soviet TAI-43 magneto delivers the following:

Generator O/C Voltage = 189V RMS.
Generator S/C Current = 77.5mA RMS.

Voltage across 1k5 resistor: 79V at 53.3mA.
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