[RFI] Spectrum Cable Boxes

James Gordon Beattie Jr w2ttt at att.net
Fri Oct 11 09:11:43 EDT 2019


Try running the cable box from a battery and isolated from the power grid.  There may be a switched mode power supply on that device or another one on another customer that is creating and conducting the noise.  Also, do this with no other cables connected to the cable box and first add the hdmi, then the cable feed.


Gordon Beattie, W2TTT 


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On Thu, Oct 10, 2019 at 11:36 PM -0400, "Jim Brown" <jim at audiosystemsgroup.com> wrote:

On 10/10/2019 4:54 PM, Anthony (N2KI) wrote:
> 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.

You're paying them, tell them to give you a box that works or cancel 
your subscription.

If you still want to do it yourself, follow the guidelines in the app 
notes about killing noise and the new HF choke cookbook. These chokes 
MUST be multiple turns on #31 toroids, or through #31 clamp-ons. They 
must go on every cable in and out of the box.

73, Jim K9YC
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