[RFI] Spectrum Cable Boxes

[Roger (K8RI)]

Likewise I run the legal limit with the cable box within 2' of the amp 
and about 40 to 80' from the antennas and no discernible problems.
Sounds like there may be a grounding problem. (earth, or RF)

73, Roger (K8RI)

On 10/10/2019 8:38 PM, wa2lbi at gmail.com wrote:
> Tony,I have a Spectrum cable/DVR box in the room directly above the shack.  My 75 meter dipole is about 30' away and only 20' or so high.  The multi band dipole is about 50' from the house at the same height.  Running 500w doesn't seem to cause any problems with the Spectrum box.  BTW, there is also a 2 port amp in front of the Spectrum box.  After the bix was first installed I had a problem and traced it to two causes.  First, a bad cable and second, loose connectors.  Replacing the bad jumper and tightening ALL connections in the system fixed the problem.  Gl!Ken WA2LBI LG G6 ------ Original message------From: Anthony (N2KI)Date: Thu, Oct 10, 2019 19:55To: rfi at contesting.com;Cc: Subject:[RFI] Spectrum Cable BoxesHello folks,
>
> Anyone on here have experience RF shielding a Spectrum Cable box?  I have
> tried all sorts of RF chokes (Material 31 1-300mHz) on the power, HDMI and
> coax inputs with very little success.  Pretty much any band wipes out the
> cable boxes.  Its not a proximity
>   effect to the antenna as the 80 meter
> antenna is at 80 feet and about 50 feet away from the house.  Also, I must
> point out that the previous cable boxes did not have these issues.  So I am
> fairly confident this is an RF shielding/filtering issue with the boxes.
> In speaking with Spectrum, I could not reach anyone in a technical
> department that has RFI experience. Next step and test is wrapping the
> boxes with aluminum foil, or cutting the cord.
>
> Thanks for any suggestions.
>
> Regards,
>
> Anthony (N2KI)
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-- 
Roger (K8RI)