Re: [Repeater-Builder] Hamtronics exciter

[scomind]

Hi Steve,     Does anyone think it would be feasible or practical to modify the TA-51 to implement an LC phase modulator?  Just how easy or how difficult might that be?     You could use a varicap, a tunable inductor, and a capacitor to build a circuit that's resonant at the crystal frequency, and that's fairly easy. But such a circuit also generates an AM component that must be removed, so another transistor stage is needed for isolation. That probably means you're up to a little perf-board ('blob') addition to the exciter.   BTW, we think that the GE PM exciter suffers from a little of the same insufficient isolation problem, but that's another rainy-day investigation.   Incidentally, the RC version of a phase modulator is sometimes called a reactance modulator, and the LC version is called a tuned circuit modulator.   73, Bob, WA9FBO Yahoo! Groups Links To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/   To unsubscribe from this group, send an email to: [EMAIL PROTECTED]   Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.