[Elecraft] Considering a K3

[David Cole]

Hi Joe,

Thank you for that, I have wondered what it was for years!
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On Sat, 2014-04-05 at 13:32 -0400, Joe Subich, W4TV wrote:
>  > I have an inrad roofing filter installed to the PRO III.  Does this
>  > still sound like Phase Noise to you?
> 
> Yes, phase noise in your 756ProIII.  The phenomena is called reciprocal
> mixing - the phase noise from your own synthesizer appears on any strong
> signal within the passband.
> 
> Icom rigs are known for terrible phase noise - I have a neighbor about
> 1/2 mile away whose transmitted phase noise and spurs from an Icom rig
> and amp wipe out a substantial portion of any band he's on.
> 
> 73,
> 
>     ... Joe, W4TV
> 
> 
> On 4/5/2014 12:51 PM, David Cole wrote:
> > Hi Dave (K6LL),
> > Thanks for that thought, but I am pretty sure it is not their rigs...
> >
> > Here is my reasoning for why I think that:
> >
> > One rig is a K3, and an AL-1500, about 1/2 mile from me, and line of
> > sight.  One of the the others is a 756 PRO III, and I don't know what
> > amp, about a half mile from me, while the third is an older Collins rig,
> > with an older Henry amp, about 100 yards from me.
> >
> > All three rigs, and my mobile rig in the driveway, cause exactly the
> > same effect when they are transmitting, the band scope, (set to
> > something like 200 KC wide), shows perfectly straight increase across
> > the entire 200 KC's of scope, along the bottom, as a raised noise floor
> > would.  It looks like phase noise, but I would expect that to roll off,
> > and not be as flat as this is.  I also live close to an AM station,
> > 100KW, and about a mile and a half away, and I see almost the same
> > thing, as I approach the station frequency.  I can see the entire noise
> > floor raise as I get closer to the station.
> >
> > I have an inrad roofing filter installed to the PRO III.  Does this
> > still sound like Phase Noise to you?
> >
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