A strong RF source likely sent the front end and maybe even the IF into
saturation to produce a condition where nothing was received. I would
judge this to be classic for RF overload. Heaven knows what the strong RF
source might have been. Too bad you didn't have a spectrum analyzer.
Also, the radio inside, being inside, likely received far less of the local
strong RF source and its front end filtering, shielding, was likely much
better than the battery operated portables.
Dave - WØLEV
On Mon, Jul 5, 2021 at 11:04 AM <kd6bzn@gmail.com> wrote:
> Maybe out of band front-end overload? The portables maybe lack filters the
> countertop model has.
>
> Talk 15: Resolving RF Interference: RF Front-end Overload Problems :
> https://www.youtube.com/watch?v=zFDjdRgZi9o
>
> Dave
>
> -----Original Message-----
> From: RFI <rfi-bounces+kd6bzn=gmail.com@contesting.com> On Behalf Of
> KD7JYK
> DM09
> Sent: Sunday, June 27, 2021 5:21 PM
> To: RFI List <rfi@contesting.com>
> Subject: [RFI] Odd broadcast radio reception.
>
> Here's a strange one! Giving the general description, in case anyone has
> experienced such an occurrence.
>
> Typical community, typical residential neighborhood. I was talking on the
> phone with a gal that has lived at the same location since 1938. I lived
> on
> the same street, and played radio for about 21 years.
>
> Beginning around the first of June, she was sitting on her porch, as she
> does daily, listening to a new portable AM/FM broadcast receiver a neighbor
> bought for her. It suddenly cut out. No reception, AM, or FM bands. No
> apparent interference noises, nothing trying to come through, as she
> described it, dead, just a slight background hiss, as if nothing was to be
> heard at all. Thinking her new radio had an issue, she pulled out one
> another neighbor had given her several years ago, another AM/FM portable
> broadcast receiver. Same reception issue, nothing to be heard, just a
> slight hiss across both the AM, and FM bands. Thinking this odd, she
> pulled
> out a THIRD radio, and older Radio Shack portable AM/FM model. Same issue!
> Nothing to be heard on either band, just a faint background hiss.
>
> She did go into the house, and try a counter top AC model, about thirty
> feet
> east of the porch, and that radio did work.
>
> She tried all three radios on the porch repeatedly, for about two weeks,
> and, about two weeks ago, suddenly all three began working again, AM, and
> FM
> broadcast bands, as though someone flipped a switch, with no other issues
> exhibited between all three portable radios, "they suddenly all started
> working at the same time, and they still are, a couple of weeks later."
>
> I gave her some pointers on comparing those four radios, and the one in her
> vehicle to each other, as well as trying to determine the extent of the
> issue, location-wise, and will get in touch with her later.
>
> I have no further details at this time. I've never experienced such a
> thing. Any speculation?
>
> Kurt
>
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--
*Dave - WØLEV*
*Just Let Darwin Work*
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