Posted by
Brett gazdzinski-2 on
Sep 04, 2007; 12:21am
URL: http://elecraft.85.s1.nabble.com/Elecraft-receiver-experience-tp452217p452219.html
Being a mostly tube guy, I have not read much about
phase noise.
Do tube circuits have phase noise?
Do discrete components (solid state, transistors) in
coil and cap VFO circuits have phase noise?
What is the worst source of phase noise?
What circuits have little or no phase noise?
My ears are shot, but I always thought some
of the old analog stuff sounded much cleaner
than digital stuff.
I was listening to a stronger SSB signal on the K2
not that long ago, and it had strong artifacts
up and down the band that caused hard copy on some
CW signals.
Was that phase noise?
Thanks for any info,
Brett
N2DTS
> -----Original Message-----
> From:
[hidden email]
> [mailto:
[hidden email]] On Behalf Of DickandSandy
> Sent: Monday, September 03, 2007 9:20 AM
> To:
[hidden email]
> Subject: [Elecraft] Elecraft receiver experience
>
> After this weekend's hamfest I was reading my new ARRL 2007
> handbook to see
> what might be NEW in ARRL testing of receivers, I came across
> this sentence
> that I thought pretty well summed up my experience with my K2
> receiver.
>
> On page 10.7 3rd column "When using a good receiver with a
> linear front end
> and a clean LO, amateurs accustomed to receivers with poor phase-noise
> performance report the impression of a seemingly emptier band
> with gaps
> between signals -- and then they begin to find readable
> signals in some of
> the gaps.
>
> This whole section in the handbook reveals the "science"
> behind the efforts
> engineers put into receiver design and why phase noise is so
> important for
> both the receive and transmit performance.
>
> Dick
> WB7OND
> "hanging around for shipment 2"
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