[RFI] Spectrum Cable Boxes

qrv at kd4e.com qrv at kd4e.com
Sun Nov 10 21:28:35 EST 2019

What about a battery with an analog trickle charger?

The analog trickle charger should be RF-quiet.

And wouldn't the battery isolate any PS RFI?

David KD4E

> Update to the Spectrum Cable box testing,
> What I have tried.
>     - RF Chokes (Material 31) on power, HDMI & RG6 - DID NOT FIX RFI
>     - Tightly wrapping the entire box in foil. - DID NOT FIX RFI
>     - Putting the box on a 12v battery - VIOLA - NO RFI
> So now that we know its the power supply,  I have to find a 12v 3A wall
> wart that is not affected by RFI.  Suggestions?
> Thanks!
> Regards,
> Anthony (N2KI)

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