[Elecraft] Elecraft receiver experience

[Brett gazdzinski]

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
>