These photos will explain:
http://w5add.masterdigital.com/assets/photos/101.jpg
<http://w5add.masterdigital.com/assets/photos/101.jpg>
http://w5add.masterdigital.com/assets/photos/102.png
<http://w5add.masterdigital.com/assets/photos/102.png>
> Down on the corner from me is a distribution amplifier for cable television.
>
> They were using PVC conduit from the meter loop to their switching power
> supply charger for the standby power system in the box. The RF from the
> switching power supply was radiating from the black and white THHN 12 gauge
> wires.
>
> Took a lot of work to get them to replace the PVC with EMT. Apparently they
> put in all of their distribution amplifiers this way. I wouldn't be surprised
> if it's like this in other areas of the country.
>
> The difference with your situation is that here the EMC was continuous, and
> the function of these installations is only to distribute cable video.
>
> Parker W5ADD
>
>
>
>
>> On Nov 13, 2016, at 14:42, Tim Duffy <k3lr@k3lr.com> wrote:
>>
>> Has anyone ever encountered broad bad RFI from a CATV trunk line amp?
>> Suspect is 10 feet off a power pole (mid span) - with three quarter inch
>> CATV hardline connections. RFI occurs "some days from 10 AM to 4 PM. Covers
>> 1 MHz to 50 MHz - pretty equal sig strength end to end. There is CATV,
>> Telco, Fiber and AC transmission and distribution all on this same pole.
>>
>> Your experience with CATV line amps?
>>
>> 73
>>
>> Tim K3LR
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