Joop, Indeed ! During lab evaluation, a sine wave locking source required much greater power (15-20dB IIRC) to achieve lock. Further, lock limits were almost impossible to discern with any degree of confidence. With a square wave, there were distinctive step jumps when approaching lock & going out of lock.
Kit VK2LL Kit VK2LL wrote: >Theory suggests that lock sensitivity could be improved in this instance >if the 10MHz duty cycle was changed from 1:1 to 6 or 7:1, the idea being >that the narrower pulse should be <0.5 period of the frequency of the >oscillator to be locked. Joop wrote: Thinking this way of injection locking, it makes sense to increase harmonic content of the injected signal. In essence it will then not lock onto the fundamental frequency, but on some harmonic part of it. In my SPICE investigation I injected a clean sine signal. Perhaps I should try with some clipped or digital signal. That might also explain why James G1PVZ was so successful. The bottom 2N918 might cause a lot of harmonics if driven into the collector cut-off. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.