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Re: [Amps] Amp causing RFI

To: "Gary Hendricks" <>
Subject: Re: [Amps] Amp causing RFI
From: AJ <>
Date: Tue, 4 Feb 2020 12:42:47 -0500
List-post: <>
Hi Gary

Ok some reason this was sent to me, not sure if it showed up in the
list or if Gary seen it.

I tend to agree with Matt on this one as a starting point.

Also one amp is a tube amp and one is solid state. There are many
differences in the way they work. Take out the filter section on that
solid state amp and just look at the spectrum analyzer . . .

Have good look at the filter section of the amp, also check the bias

Cheers AJ___ VE3HJ

>On Wed, 29 Jan 2020 00:14:05 -0600
>"Matt" <> wrote:
> Hi Gary,
> The Ten-Tec uses 4 pair of push-pull finals outputting into a set of
> relay-switched low pass filter networks.    You might want to check
> the 40m low pass filter section.   I would do a quick visual check of
> the caps in the 40m low pass section.  Silver mica caps are popular
> for this application so look for any burnt spots in the center of the
> caps.   If you have access to a frequency response analyzer you can
> also sweep the filter to verify its performance, at least at a low
> signal power level.    I have two home brewed solid state amps that
> use similar circuitry and have on occasion managed to damage various
> low pass filter sections.
> Hope this helps & good luck.
> 73
> Matt
>On Tue, 28 Jan 2020 11:37:12 -0500
>"Gary Hendricks" <> wrote:
> 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
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