[RFI] Spectrum Cable Boxes

[Jim Miller]

I got called out on a DFing trip because all of a sudden several people in a
section of a subdivision couldn't get their garage doors to open one Sunday
morning.  By the time I got there the count was up to 5 doors as I remember.
Long story but found a new box on the side of a garage.  It had been worked
on (or installed?) the day before. The cable company came back out and fixed
it.   Most likely as it was assumed to be a bad cable connector
installation.  
"Replacing" the box won't help if the coax connector isn't installed
properly.
73, Jim KG0KP


-----Original Message-----
From: RFI [mailto:rfi-bounces at contesting.com] On Behalf Of Anthony (N2KI)
Sent: Thursday, October 10, 2019 6:55 PM
To: rfi at contesting.com
Subject: [RFI] Spectrum Cable Boxes

Hello 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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