[RFI] medical lab RFI

[Don Kirk]

Hi Jim,

It appears there are a lot of cellular systems in the US still using the
600, 700 and 850 MHz cellular bands in the US (4G LTE and low band 5G
systems as an example) depending on the cellular provider.  I currently see
lots of activity on those bands in the Indianapolis area as an example when
viewed on a spectrum analyzer.

Just FYI,
Don wd8dsb

On Wed, Jul 19, 2023 at 7:31 PM Jim Brown <jim at audiosystemsgroup.com> wrote:

> On 7/19/2023 3:20 PM, Gene Smar via RFI wrote:
> >   Maybe your peer's friend can call his electric utility company's RFI
> finder person.
>
> I could be wrong, but I think 2.4 Gig is the lowest frequency range used
> by cell phones in NA, and the sites use antennas with a very narrow
> vertical pattern, designed to shoot over the heads of folks in the near
> field. Unless one of the antennas is very close and fairly low with
> respect to the victim, the most likely RFI would seem to be radiated by
> poorly shielded electronics or power supplies. The latter is what I'd
> expect the power guys to know about.
>
> 73, Jim K9YC
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