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

[Steven Katz]

The Hercules II uses a separate 14V 80A power supply and the interconnecting DC power cable is hot as hell, in my experience -- having owned one back in the 90s.

Big difference between that and the self-contained SB-230.

Steve, WB2WIK

-----Original Message-----
From: Amps <amps-bounces at contesting.com> On Behalf Of Alek Petkovic
Sent: Wednesday, February 5, 2020 2:47 PM
To: amps at contesting.com
Subject: Re: [Amps] Amp causing RFI new attempt on the original request

 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 at contesting.com
>> http://lists.contesting.com/mailman/listinfo/amps
> _______________________________________________
> Amps mailing list
> Amps at contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
_______________________________________________
Amps mailing list
Amps at contesting.com
http://lists.contesting.com/mailman/listinfo/amps