wrote:
>Hi folks. I have a problem with RFI on 160 meters. I just put up a 1/4 wave
>sloper on my 65" Rohn 45 tower at the 35' level. It is fed directly to an
>Ameritron switch-box at the base of the tower. I have a C3E, CC D3W and
>yagis for six, two, 222, 432 and 1.2 on the tower as well as a Diamond
>vertical and inverted vee for 80/40. So, the HF stuff all goes through the
>switch box. The UHF/VHF goes direct to the shack in my attic via 7/8" to
>1/2" Andrew Heliax. Tower is grounded with an eight foot rod on one leg. It
>hasn't been up very long. I get NO RFI of any sort on any other bands, even
>when using amp.
>
>The 160 meter sloper is getting into the two control panels on my home
>security system. Anything over about 30 watts causes the "beep" in the two
>panels to "beep." You should hear CW. I am guessing and a friend is telling
>me that the RF is coming down the outside of one of my pieces of
>coax??????????
>
>I don't even have a clue where to start.
Sure you do - you've identified that you need some clues! So go and get
some...
Build or buy a clip-on RF current probe, and use it all around your
system. When you actually *know* where the unwanted currents are
flowing, and how big they are, you'll be very close to solving the
problem.
--
73 from Ian G3SEK 'In Practice' columnist for RadCom (RSGB)
Editor, 'The VHF/UHF DX Book'
http://www.ifwtech.co.uk/g3sek
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