TVI can occur anywhere any time regardless of the quality of the coax, the
connectors or any thing else.... the number of vaiiables must be in the
millions.
Then again, it can not hapen when it should. My standard TV ant is abt 12 feet
from my 40 m dipole and on same height. I get TVI on only one channel, whereas
it should blow up the set hi hi. There are several web sites and books that
discuss this in exhaustive detail, but the short answer is... u will have TVI
when it happens but can not be predicted accurately.
BTW, beware of doing ANYTHING to a tv set that you do not own in legal-minded
America... U put a nice free filter on ur neighbor's tv and the TVI goes
away... but weeks later same neighbor claims your filter blew up his set and he
wants $2,000 from you today!!! And he also wants u to pay for his wife's
dental bill due to RF in her metal fillings. Sad to say, 73
Charles Harpole
k4vud@hotmail.com
> Date: Thu, 15 May 2008 09:38:38 -0400
> From: roncasa@verizon.net
> To: tentec@contesting.com
> Subject: Re: [TenTec] 95% Shield
>
> Jim WA9YSD wrote:
>> How much power in watts or milliwatts does it take to interfere with the TV
>> with an outside antenna when operating HF? How much with cable TV?
>> Lets say that the outside antenna and cable TV is in an urban area.
>> Neighbors house is say 75 feet from the base of the ham tower.
>>
>>
>
>
> Jim:
>
> The answers are simple:
>
> If there is a bad connector or jumper cable, RF ingress will occur, the
> question of how much wattage is moot.
>
> If the TV antenna is near or in the radiating field of the radio
> antenna, interference will happen.
>
> Time to try repairing/filtering devices/methods to eliminate the problem.
>
> If you are just looking for figures based on technical theory, read a
> book.
>
> May I suggest you go to another forum that can really help you:
>
> tvi-rfi-emi@mailman.qth.net
>
> you may have to register just like you did on this reflector.
>
> Ron
> "the 516 is a keeper"
>
>
>
> _______________________________________________
> TenTec mailing list
> TenTec@contesting.com
> http://lists.contesting.com/mailman/listinfo/tentec
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