It likely was a Class-E amp (or worse). They can be dirty as $%^& when
stressed (by the strong bass notes).
I once tested a Class-E home automation system with all kinds of Class-E
amps (for intercoms and distribution of music from a number of sources).
It was the ONLY product in 35+ years we had to install an 20 dB attenuator
in series with the input to the R&S conducted emissions receiver!
Dave - WØLEV
On Sun, Dec 25, 2022 at 8:09 PM Henry Pfizenmayer via RFI <
rfi@contesting.com> wrote:
> Mike et al ---If that was not tongue in cheek as they say -- this last
> summer I started getting thumps of
>
> noise on 6 meters -and was far worse at 25 mhz -- Then I noticed it was
> in sync with neighbors outside
>
> speakers thumping out a strong bass line. I went out with my IcomR10 rx
> and loop -
> and yep that was the source. The amp was obviously going into oscillation
> in sync with the loud bass notes .
> No use talking to that guy - so I just prayed the damn amp would fry
> itself . Prayers were answered
>
> in just a hour or so and noise never re-appeared.
>
>
>
> 73 Hank K7HP
>
>
>
>
>
>
>
>
>
> Message: 1
> Date: Sun, 25 Dec 2022 11:51:20 -0500
> From: Michael Martin <mike@rfiservices.com>
> To: "Dave (NK7Z)" <dave@nk7z.net>
> Cc: Rfi List <rfi@contesting.com>
> Subject: Re: [RFI] Another Solar Panel RFI System
> Message-ID:
> <CAPZkRSEvyTNyLcJT-3e1gNnkTP+WNX15DFXUXHpqf5YZa67YEw@mail.gmail.com>
> Content-Type: text/plain; charset="UTF-8"
>
> I'm trying to capture a noise with the intermittency rhythm in sync with
> Christmas music
>
> Michael Martin
> RFI Services
> 51 W Bay Front Rd
> Lothian, MD 20711
>
> 240-508-3760
> mike@rfiservices.com
> www.rfiservices.com<
> https://webmail.centurylink.net/app/www.rfiservices.com>
> _______________________________________________
> RFI mailing list
> RFI@contesting.com
> http://lists.contesting.com/mailman/listinfo/rfi
>
--
*Dave - WØLEV*
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