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Re: [Amps] Amp causing RFI Update

To: Gary H <>
Subject: Re: [Amps] Amp causing RFI Update
From: Mark Schoonover <>
Date: Tue, 4 Feb 2020 13:02:40 -0800
List-post: <>

I wonder what would be on the SA if you took it out to near the ends of the

73! Mark KA6WKE

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On Tue, Feb 4, 2020 at 11:07 AM Gary H <> wrote:

> Well thanks all for the advice. As for grounds I have two 8 ft ground
> rods and large radial field bonded to shack ground bus with short heavy
> wire and connected back to mains entrance ground.
> We checked both amps with a spectrum analyzer all the way to 6 GHz.
> Tube amp was not real clean but within specs for a 30 year old
> technology. The Hercules II SS amp was very clean.  So why Hercules
> bother his motion light and heath does not remains a mystery.
> I tried three different antennas. One coax fed dipole, one open wire fed
> dipole and one vertical. Only the vertical did not cause his lights to
> come on with either amp.  My ants are 100 feet from his motion lights
> and 80 ft in the air. Vert is ground mounted at radial field.
> I have fixed the problem by relocating the ends of the antennas another
> 50 feet further away.  I not longer bother his light.  Why this happens
> will have to be chalked up to RF black magic and his 9.99 walmart motion
> lights.
> Thanks all
> Gary K4MT
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