[RFI] Spectrum Cable Boxes

Anthony (N2KI) n2ki.ham at gmail.com
Sat Oct 26 18:14:13 EDT 2019

I have choked of all cables on in multiple locations and the box still
"explodes".  I have no access to a 3A 12vDC power supply to try and swap to
see if that makes a difference.


Anthony (N2KI)

On Thu, Oct 17, 2019 at 9:35 PM Jim Miller <JimMiller at stl-online.net> wrote:

> 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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