From: Paul
Date: Tue, 15 May 2001 16:46:16 +0100
Subject: [TSSP] Multimode CW excitation
Hi All, Just an off-the-cuff idea for your amusement, Say, P watts of CW base fed into a secondary gives a peak top volts V. Half that power, P/2 watts, would then give V/sqrt(2) Suppose you then setup a typical primary winding, resonated with the usual Cpri, but with the gap shorted. Modest k factor. Now the single mode splits into two, nearby frequencies, call them f+ and f-. Drive the base of the coupled system with P/2 watts at each resonance f+ and f-, for a total drive of P watts. Now, with the assumption that we still get V/sqrt(2) volts in each mode at the coil top, this means that (f+ - f-) times each second, the two modes reinforce at the top to give 2V/sqrt(2) volts, the net result being a peak voltage for our P watts which is sqrt(2) times that which we had with single mode CW excitation. Then suppose we add a second 'primary' resonator... Cheers, -- Paul Nicholson, Manchester, UK. --
Maintainer Paul Nicholson, paul@abelian.demon.co.uk.