[Elecraft] Considering a K3

[David Cole]

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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On Sat, 2014-04-05 at 09:12 -0700, Dave Hachadorian wrote:
> > I have 4 active hams living within 1/2 mile of me, and while
> >the Pro III works well, I can tell from de-sense that others are
> >on when
> >one of them operates.  The band scope of the PRO III will show
> >an
> >increased base line across the entire scope...  All 4 run a KW.
> 
> The increased base line sounds more like broadband phase noise
> generated in THEIR radios.  Phase noise is a background hiss that
> stays relatively constant all the time their rig is in the
> transmit position, regardless if they are speaking on SSB or
> keying on CW.  The noise will be there during speech pauses or CW
> key-up periods.  If that is the case, THEY are the ones who need
> the K3's to clean up their transmitted signal.  If their phase
> noise covers the frequency that you are trying to hear, there's
> not much you can do at your end.
> 
> 
> Dave Hachadorian, K6LL
> Yuma, AZ
> 
> 
> 
> 
> 
> 
> 
> . 
> 
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