|
I believe any tuning to make the oscillator and burst inputs to the phase detector *equal* amplitude is irrelevant. The important thing is that both the oscillator output coil and the burst input coil are tuned for maximum response at 3.58 MHz. Unlike the oscillator zero beat tuning, these two are relatively broad peaks of the resonances whose purpose is to get maximum input to the phase detector from both the burst and the oscillator.
__________________
www.bretl.com
Old TV literature, New York World's Fair, and other miscellany
|