[Top] [All Lists]

Re: [Amps] Amp causing RFI new attempt on the original request

Subject: Re: [Amps] Amp causing RFI new attempt on the original request
From: Alek Petkovic <>
Date: Thu, 6 Feb 2020 06:47:15 +0800
List-post: <>
From 1-5 on grounding, in the Ten Tec maual.

"In the interst of personal safety and to reduce the possibility of stray RF pickup on interconnecting cables, all station equipment should be well grounded to earth. It is important to strap all equipment chassis together with short heavy wire."

The SB-230 may not be as susceptible to problems, as the Ten Tec, when it comes to grounding.

If you are getting stray RF back into the driving transmitter, then this will be amplified and may cause any number of problems, including the Uncle Fester light bulb effect.

73, Alek. VK6APK

On 6/02/2020 1:38 am, Henk Remijn PA5KT via Amps wrote:
I think this is an interesting question which deserves a better answer then the ground loop discussion.

The Tentec is a solid state amplifier and the SB220 is using tubes.

In general tube amps are more lineair then solid state.

I would try to measure them on a spectrum analyzer to see if there is a different in produced spectrum.
Based on that you might consider an additional filter on your amplifier.

Most likely the cheapest solution is some kind of ferrite around the wires of the light.

73 Henk PA5KT

Op 28-1-2020 om 17:37 schreef Gary Hendricks:
I have a Tentec Hercules II amplifier. When I am on 40 meters only it
sets off my neighbors outside motion light. I know these lights are a
problem, but what has me concerned is when I run my old SB-230 at the
same power level his light does not come on.
Do you think this indicates some purity issues with the Tentec amp?
Maybe something in the VHF range?
I wonder if an old fashioned low pass filter might help. Any ideas?
Gary K4MT
Amps mailing list
Amps mailing list
Amps mailing list

<Prev in Thread] Current Thread [Next in Thread>