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One tube transmitter
In message , William
Sommerwerck writes You would find it rather difficult to FM a crystal oscillator. Possible, but difficult. Not really. It's done all the time in temperature-compensated oscillators, simply by varying the series or load capacitance. OK then - 'Possible, but much more difficult than with a free-running L-C circuit'. When an oscillator is crystal controlled, to get a lot of FM, it usually takes a bit more than 'slipping a variap' into the circuit. You usually have to use some form of VXO circuit. Even then, the amount of FM you get can depend a lot on the characteristics of the crystal. And it may not be very linear. But it all depends on what you need. Some early crystal-controlled FM equipment avoids the problems of FMing the crystal itself. Instead, in a later stage they phase-modulate the signal (producing a predictable amount of PM) and, of course, multiply up to the final frequency. Ian. -- |
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