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Re: [RFI] Recent RFI status - Direct TV and Dish?

To: "W5JR.Mike" <w5jr.mike@gmail.com>, "jim@audiosystemsgroup.com" <jim@audiosystemsgroup.com>
Subject: Re: [RFI] Recent RFI status - Direct TV and Dish?
From: Dale <svetanoff@earthlink.net>
Reply-to: Dale <svetanoff@earthlink.net>
Date: Mon, 26 Aug 2013 23:37:10 -0500 (GMT-05:00)
List-post: <rfi@contesting.com">mailto:rfi@contesting.com>
Mike,

It sounds to me like the manufacturer of the switcher wall wart bothered to put 
RFI suppression on only 1 side of the line, rather than both sides.  I'll also 
guess that there is no line-to-line cap in it, either, on the wall plug end.  
If that is true, I guess that is only half as bad as omitting all RFI 
suppression components, as some makers are prone to do.

73, Dale
WA9ENA


-----Original Message-----
>From: "W5JR.Mike" <w5jr.mike@gmail.com>
>Sent: Aug 26, 2013 2:43 PM
>To: "jim@audiosystemsgroup.com" <jim@audiosystemsgroup.com>
>Cc: "rfi@contesting.com" <rfi@contesting.com>
>Subject: Re: [RFI] Recent RFI status - Direct TV and Dish?
>
>I agree with Jim to watch out for the switcher power supplies. My own 
>experience with a Comcast unit replaced over the summer was noticed to be 
>quite ugly on 160m later in the fall when my focus turned back to TopBand. I 
>could easily trace the electrical wiring in our walls with my AM radio looking 
>for the source. Unplugged the very tiny wall wart and all was quiet. I plugged 
>it back in after the contest and found flipping it 180* was quiet, but as 
>originally plugged in was noisy. My outlet indicated proper wiring from one of 
>the usual plug-in checkers. I left it plugged in the "quiet" way. 
>
>tnx
>Mike / W5JR
>
>On Aug 26, 2013, at 3:23 PM, Jim Brown <jim@audiosystemsgroup.com> wrote:
>
>> On 8/26/2013 11:33 AM, Tim Duffy wrote:
>>> Also, how about RFI problems associated with nearby transmitting antennas
>>> that might cause RFI overload problems to the Dish or Direct TV systems - 
>>> as in TVI?
>> 
>> I would expect any issues to be the result of 1) noisy switching power 
>> supplies,  2) noise from the downlink electronics, and 3) common mode 
>> coupling on the coax  (both TX and RX). and I would expect them to be easily 
>> solved by winding turns around ferrite cores.  I had DirecTV in Chicago, and 
>> never had any issues, with antennas and DirecTV downlead in close proximity 
>> (5-25 ft). I don't remember if I did anything with chokes.
>> 
>> 73, Jim K9YC
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