[RFI] RFI from CATV line amps?
HankP
pfizenmayer at q.com
Sun Nov 13 16:49:22 EST 2016
Tim - Thats the frequency range for reverse path from customer to the company - (sometimes up to 100 or 200 in some systems) but probably a bad coax shield break somewhere .Not sure of the technology today but I was in a RF Module group at Moto Semi and we built millions of CATV hybrids for people LIke SA and Magnavox and CCor et al . The amps themselves were broadband push pull cascodes. Transformer coupled in and out . I have no idea what they are using the reverse path for anymore and at the time all the power supplies were linear - not switchers but I suspect thats all changed. .At any rate it SHOULD be all bottled up. GL with cable company - hope its better than COX here in Phoenix. 73 Hank K7HP ----- Original Message -----
> 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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