[RFI] Honda Generator RFI

[Clay Curtiss W7CE]

I forgot to mention that there was only a few db (less than 1 S-unit) of
noise difference between the end-fed wire that I had been using and the
balanced dipole.

----- Original Message ----- 
From: "Clay Curtiss W7CE" <w7ce at curtiss.net>
To: <rfi at contesting.com>
Sent: Tuesday, March 29, 2005 3:04 PM
Subject: Re: [RFI] Honda Generator RFI


> I ran some more tests over the weekend.  My antenna was a 50' high, 50'
long
> dipole center fed with twin feed through an antenna tuner with an internal
> 4:1 balun.  With the generator running and my Icom 746/PS15 connected to
it
> (through the cabin wiring), my noise level on 20M is about S9.  When I
> connect the 746 to my truck battery the noise level drops only slightly to
> S8+.  When I turn the generator off, the noise level becomes almost
> non-existant with just atmospheric noise.  Unfortunately, I forgot to
check
> the noise level when the generator is running but disconnected from the
> cabin.  I'll try that this next weekend.  Also, the noise level is
> definitely higher at some frequencies.  At this point I'm pretty sure that
> what I have is common-mode noise that is being radiated by the cabin
wiring.
> If I'm correct, then I should see lower noise levels when the generator is
> running but unplugged from the cabin.  Now i just need to decide whether
to
> purchase a commerical RFI filter or build one with a couple of toroids.
>
> Thanks again for all of the helpful suggestions.
>
> Clay  W7CE
>
> ----- Original Message ----- 
> From: "Clay Curtiss W7CE" <w7ce at curtiss.net>
> To: <rfi at contesting.com>
> Sent: Friday, March 25, 2005 9:55 AM
> Subject: Re: [RFI] Honda Generator RFI
>
>
> > Thanks to all for the very helpful replies.  I'm heading up to the cabin
> > this weekend and will do some more experimenting to determine the noise
> > source.  Then I can determine the best way to quiet things down.  I also
> > hope to put up a dipole that is center fed with twin feed through a
tuner.
> > It will be interesting to see if that is quieter than the end fed wire
> that
> > I'm using now.  I'll post the results on Monday.
> >
> > Clay  W7CE
> >
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