[RFI] Spectrum Cable Boxes

[James Gordon Beattie Jr]

That's the ticket!


Linear, aka iron power supplies are best.


73,


Gordon, W2TTT 


201.314.6964




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On Sun, Nov 10, 2019 at 10:27 PM -0500, "Tim Duffy" <k3lr at k3lr.com> wrote:










I have Spectrum cable modem and cable TV boxes here at K3LR. All use the
Astron RS-4A linear power supplies

https://www.dxengineering.com/parts/asr-rs-4a

No RFI problems at all

73
Tim K3LR

-----Original Message-----
From: RFI [mailto:rfi-bounces at contesting.com] On Behalf Of Jamie WW3S
Sent: Sunday, November 10, 2019 9:27 PM
To: Anthony (N2KI); James Gordon Beattie Jr; rfi at contesting.com
Subject: Re: [RFI] Spectrum Cable Boxes

get a small Astron linear supply, preferably old stock, if newer, make 
sure the green wire inside is connected to the chassis by scraping the 
paint of so it make contact to bare metal, and while you are at it, 
remove the paint from the cabinet interior where each screw goes in

------ Original Message ------
From: "Anthony (N2KI)" 
To: "James Gordon Beattie Jr" ; "rfi at contesting.com" 

Sent: 11/10/2019 9:22:54 PM
Subject: Re: [RFI] Spectrum Cable Boxes

>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)
>
>
>
>
>
>
>
>
>
>On Sun, Oct 27, 2019 at 12:52 AM James Gordon Beattie Jr 
>wrote:
>
>>  Anthony,
>>  Will the cable box run on a 12VDC battery?
>>  73,
>>  Gordon Beattie, W2TTT
>>  201.314.6964
>>
>>  Get Outlook for Android 
>>
>>
>>
>>
>>  On Sat, Oct 26, 2019 at 6:14 PM -0400, "Anthony (N2KI)" <
>>n2ki.ham at gmail.com> wrote:
>>
>>  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.
>>>
>>>
>>>  Regards,
>>>
>>>  Anthony (N2KI)
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>  On Thu, Oct 17, 2019 at 9:35 PM Jim Miller  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)
>>>  > _______________________________________________
>>>  > RFI mailing list
>>>  > RFI at contesting.com
>>>  > http://lists.contesting.com/mailman/listinfo/rfi
>>>  >
>>>  >
>>>  >
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