The last year and a half/two years (roughly) has seen the use of the 600 MHz
bands, with
an attendant increase in interference to my pocket portable AM/FM Sony radio.
When within line of sight of the local, nearby water tower all manner of clicks
and buzzes arenow quite apparent, and as this wasn't the quite the case a
couple years back when 600 MHzhad not been used yet, I attribute the
interference to the use of that band.
I also note some interference (images, most likely) to several, but not all,
general purposepublic safety scanners such as the Uniden BC895XLT. The high-IF
Radio Shack Pro-2006seems to be less affected than the Uniden model.
A quick look a year back at the 600 MHz band with the HP 8591E Spec An
revealed 600 MHz signal levels roughly 10 dB above the usual 869 - 894 MHz
cellular signals.
de AA5CT Jim
On Wednesday, July 19, 2023, 8:31:18 PM GMT-5, Steve Maki <steve@k8lx.org>
wrote:
Hi Jim,
In less populated areas (actually all areas) the 700 MHz, 800 MHz,
1.7/2.1 GHz (AWS), and 1.9 GHz bands are *prime* real estate for the
telcos, including 5G tech. In densely populated areas there's a lot of
data traffic on 2.5 & 3.5 GHz, and some on 28 gHz.
-Steve K8LX
On 07/19/23 7:31 PM, Jim Brown 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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