Lyle, Thanks for the info. Would I be right in assuming the more conversions, the higher the phase noise, even if crystal oscillators are used? In the homebrew receivers, I used B+W coil stock, which I think has very high Q...
Brett N2DTS > > Oscillators have phase noise. Properly designed -- with attention to > this -- the phase noise can be managed and made small. Crystal > oscillators are usually the cleanest, but they also have it > to varying > degrees. > > The worst are oscillators with improper gain using low Q > components in > the frequency determining section. This is also a > description of many > voltage controlled oscillators (VCOs) used in frequency synthesizers. > Early synthesizers used in Amateur radio products were often > truly awful > in this regard. > > The higher in frequency one goes, the harder it is to have low phase > noise close to the carrier being generated. Thus, it is generally > easier to have a certain amount of phase noise 500 Hz from > the carrier > at 1 MHz than it is at 1 GHz. > > This is part of the reason that many radios that feature up > conversion > (for general coverage) have poorer phase noise than most > radios that do not. > > 73, > > Lyle KK7P > _______________________________________________ Elecraft mailing list Post to: [email protected] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
