[RFI] medical lab RFI

[AA5CT]

 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 at 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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