[Elecraft] P3 RFI

[Stephen Prior]

Hi John,

I wasn't including EME antennas in my observations!  That's a real nuisance.
 Maybe a few atoms thickness of metal (Ni comes to mind) vacuum deposited on
the acrylic panel covering the display would help - in a former life I could
have done it for you!

It's worth a thought if it's that troublesome.  Maybe Elecraft could look
into it.

73 Stephen G4SJP


On 7 July 2011 08:06, John Lemay <john at carltonhouse.eclipse.co.uk> wrote:

> Good morning all
>
> I raised the issue of noise coming from my P3 several months ago.
>
> It is noticeable on 2m, using an EME array that is about 50ft from the rig.
> There is a combination of azimuth and elevation in which the array "looks"
> directly at my shack and under those circumstances the noise level on 2m
> rises several dB.
>
> I was advised to put chokes on the cables at the P3 end, and to revisit the
> cleaning of metal panels on the P3 where they meet. I've done this till I'm
> blue in the face, but it doesn't help because the P3 radiates a small
> amount
> of hash from the display screen. It's not practical to screen this !
>
> Regards
>
> John G4ZTR
>
>
> -----Original Message-----
> From: elecraft-bounces at mailman.qth.net
> [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Stephen Prior
> Sent: 06 July 2011 21:29
> To: K7WIA
> Cc: elecraft at mailman.qth.net
> Subject: Re: [Elecraft] P3 RFI
>
> Ed,
>
> Listening on a TH-D72 on about 137MHz, yes the noise from the P3 is indeed
> loud.  However, by the time I have more than  a metre or so separation
> between the P3 and the handie, the noise drops below the handie's squelch
> threshold, so for me at least, it's a very localised phenomenon.
>  The interference is also present on 2m, but would certainly be inaudible
> with an antenna placed well outside of the shack.
>
> 73 Stephen G4SJP
>
> On 6 July 2011 21:20, K7WIA <emoss98133 at msn.com> wrote:
>
> > FWIW
> >
> > This morning we had a very good opening on 6 meters to the east coast
> Maine
> > down to Florida from the PNW,
> > When the band died, I thought it would be a good time to go out and snoop
> > the neighborhood for the line noise source that bugs me,   So i got out
> my
> > MFJ Line Noise Meter, put it on the desk to put in a new battery.   I
> > turned
> > it on and what a racket. so I snooped the shack and found it comes from
> the
> > P3.
> > turn the power off on the P3 and silence,  I could get 30 feet away
> before
> > I
> > could not hear it any more.
> > I don't hear any of the RFI on any band  160<>6. So I don't know if it is
> > there on 2 meters, The MFJ receives on the Aircraft band around 137 MHZ.
> so
> > I don't know if would effect 2 meters or not.
> >
> >  Ed K7WIA
> >
> > --
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