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Author Topic: Feedline Entry  (Read 701 times)
N8EUI
Member

Posts: 146




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« on: March 07, 2003, 02:40:00 AM »

Does anyone have any plans/photos on how to build a way to bring the coax and or ladder line into the shack and have a means to disconnect the feedline to earth ground for safety when not in use?  I recently purchased a home with a finished basement and I plan to put up a dipole or two.  I want a safe installation from lightning and stray RFI.  My basement foundation is cement block with windows every few feet.  Any suggestions?
Thanks,
Tom, N8EUI  
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KD5VHF
Member

Posts: 84




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« Reply #1 on: March 07, 2003, 11:41:36 PM »

I cut a piece of plexiglass the width of my window and about 4" high. Open the window then close it on to the plexiglass and sealed around it with silicone. I drilled holes in the plexiglass just large enough for the coax, ground leads and twin leads to fit through and sealed around them with more silicone.I also added a small screw to the inside of each side of the window frame to deter opening. I have a sepperate ground rod just outside the window with a braid running inside and a coax connector soldered to the braid.When I'm away from the shack I screw the coax to the ground. I'm not really positive this helped or not(maybe just lucky) but my verticle took a hit last December and when I got home I found pieces of the verticle laying in the yard and several places along the coax were melted. My stomach was in a big knot until I went inside and found no damage to any equipment.Luck or not, I still follow the same procedure.:-)
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WA4MJF
Member

Posts: 1003




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« Reply #2 on: March 10, 2003, 10:21:26 PM »

Many years ago, when I used 72 ohm twin line feeders,
I used a BIG DPDT Knife switch (Navy Surplus, I
think) and just ran one side to ground rod.
When not in use I kept the switch thrown
down (ground).  I used a porcerlin feed through tube
to get it inside.  Then I had a lighter duty
DPDT knife switch to switch from rx to tx.

For coax, I use the Alpha Delta, but there
are others such as Poly phaser.  Once or twice a year,
the fiber glass covered antenna on tip top of tower gets shattered, but equipment has never been hurt.

73 de Ronnie

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N8EUI
Member

Posts: 146




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« Reply #3 on: March 12, 2003, 10:47:21 PM »

Thank you for the ideas.  I'll ponder them.
Tom, N8EUI
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K9KJM
Member

Posts: 2415




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« Reply #4 on: March 19, 2003, 12:58:01 AM »

One of the neatest set ups to run coax inside is to
buy and install a standard household dryer vent
assembly. (Only about 5 bucks at home improvement stores)  Rent a 4" drill if no one you knows can help
drilling the hole, And you will have a nice large
entry for lots of coax!  The idea to replace a window
pane with plexiglass is also great.
KD5VHF has the right idea, GROUND any unused antenna
coax!  Easy way is with a coax switch. When not in use,
put all antennas to ground. NEVER just "disconnect"
and leave loose! The heavier the conductor out to
"ground" and the larger the ground system is, The
better. For great information on protection, See the
tech tips on the Polyphaser website.
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