[RFI] Spectrum Cable Boxes

Clay Autery KY5G at montac.com
Fri Oct 11 18:31:15 EDT 2019

I can GUARANTEE you that that box is using a switch mode power supply 

IF it is external, it is ALMOST a trivial exercise to determine the 
proper voltage and amperage requirements and supply it with clean DC 

It WILL be a lot quieter with the SMPS gone....  now, the ROUTER inside 
the unit will also be making a racket as well.... that requires some 
additional RFI "trickery" to defeat.... but it IS doable.

Clay Autery, KY5G
(318) 518-1389

On 11-Oct-19 08:11, James Gordon Beattie Jr wrote:
> Jim,
> 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.
> 73,
> Gordon Beattie, W2TTT
> 201.314.6964

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