At 7/27/2010 10:15 AM, you wrote: >case you haven't figured that out)). By the way, the GE PLL exciter has >22 dB less phase noise at 600 kHz from its primary carrier than does its >multiplier counterpart, you can bet it's way more than that at 6 MHz.
That 22 dB is an interesting figure: the amount of increased phase noise contribution as a result of multiplication is 20*log(N), where N is the multiplication factor. The multiplied-crystal G.E VHFHB exciter's multiplication factor is 12, which gives 20*log(12)=21.58 dB! My theoretical guess as to what would happen @ 6 MHz out is that the difference in phase noise between the 2 exciters would greatly diminish due to the Q of the tuned stages in the multiplied exciter kicking in. Bob NO6B
