[Elecraft] P3 RFI

[John Lemay]

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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