[TVI-RFI-EMI] Re: TVI-RFI-EMI Digest, Vol 15, Issue 1

[D. Ramos]

Hello: As a follow-up to my previous e-mail regarding the UHF TV 
interference you are investigating, I implied the trouble was only
on TV channel 46. You did say the problems started appearing on 
channel 46.Sorry,I got that wrong.If you were to check all
the channels are to TV channel 60,you would end up at 746 Mhz.If you 
were to divide that, you would end up at 373 Mhz.The
frequency 373 MHz would still be in the middle of the UHF military 
band. Your complainer didn't mention hearing voices whenever
the interference appeared.That would leave the possibilty of a data 
stream or data burst of some kind.As before, is there a military
base where this guy lives?
                                                                 Dan Ramos
At 01:03 4/1/2007, you wrote:
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>Today's Topics:
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>    1. UHF TVI (Ed Tanton)
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>
>----------------------------------------------------------------------
>
>Message: 1
>Date: Sat, 31 Mar 2007 15:42:26 -0400
>From: Ed Tanton <n4xy at earthlink.net>
>Subject: [TVI-RFI-EMI] UHF TVI
>To: TVI-RFI-EMI Reflector <Tvi-Rfi-Emi at mailman.qth.net>
>Cc: SEDXC Reflector <sedxc at contesting.com>,     North Georgia QRP Club
>         <NoGaQRP at mailman.qth.net>
>Message-ID: <E1HXjUB-00009E-00 at pop-siberian.atl.sa.earthlink.net>
>Content-Type: text/plain; charset="us-ascii"; format=flowed
>
>I have been asked, as the ARRL's (GA) Technical Coordinator, to look
>into a case of TVI. Here is what I have replied to our GA SCM:
>______________________________________________________
>
>The 'victim' is a very nice guy-not being the least bit grumpy. There
>are some interesting things about his problem, but I don't think it's
>going to be a ham causing it. The problem is UHF only. Starts about
>CH46. Nothing on VHF at all. I asked him to try and record it for me,
>and told him I would be happy to come look at everything, and see if
>I have any ideas. They do not watch all that much TV, and that's why
>they do not have cable. Still, it sounds like the interference just
>happens to be on channels he does want to watch.
>
>I gave him both my TEL# and email address. I reinforced my interest
>in his problem, and told him I was only interested in solving
>it-regardless of what-or who-is at fault.
>
>This problem only occurs at night (or, they may not really have
>noticed it in the daytime.) It is irregular, consisting of picture
>disruption and sound noise. He did indeed get a new TV, and this has
>been going on for years. He has an indoor (attic) TV antenna, with
>not much more than 30ft of coax. He thinks he grounded the antenna to
>a water-pipe ground. As I mentioned, he's going to try and record
>some of it-though it is clearly not (he said) Morse code-and
>otherwise, the best we will be able to tell would be if there's any
>audible signal ID possible-such as speech or digital signal products.
>
>Very interesting! I explained that it did not sound like it was a
>ham, but that didn't matter to me at all-that I would do whatever I
>could to help him. I'll let you know what I learn.
>
>I may try building him a UHF bandpass filter for starters. Initially,
>I'm thinking some sort of nearby commercial installation mixer
>product-but he said there were no hill/mountain-top antenna clusters
>nearby; no TV, police or fire stations; nor any cell-towers.
>Regardless, I'll see what can be done about it.
>______________________________________________________
>
>If any of you have any suggestions, I would certainly welcome them.
>
>
>Ed Tanton
>
>website: http://www.n4xy.com
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>--------------------------------------------------
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>End of TVI-RFI-EMI Digest, Vol 15, Issue 1
>******************************************