| Author |
Message |
    
Charliebrown
Intermediate Member
Username: Charliebrown
Post Number: 164
Registered: 10-2002
| | Posted on Thursday, March 24, 2011 - 12:06 pm: | 
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I think it had been said that the ground wire should not be but so long so it would not radiate. If that is correct, WHAT SHOULD YOU DO TO GROUND AN ANTENNA THAT IS 70 FOOT HIGH IN A TREE? DO YOU PUT THE GROUND ON THE SHIELD OF THE COAX? HOW ABOUT GENT'S. ANY IDEA WHAT IS THE CORRECT WAY? |
Charliebrown
Intermediate Member
Username: Charliebrown
Post Number: 165
Registered: 10-2002
| | Posted on Saturday, March 26, 2011 - 8:12 am: |
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TECH 833, WOULD IT WORK WITHOUT ANY PROBLEM TO USE THE SHIELD OF THE COAX TO CONNECT TO A GROUND ROD OR SHOULD I RUN A CABLE TO THE MOUNTING BRACKET OF THE ANTENNA 70 FOOT HIGH IN A TREE? I THINK IT HAD BEEN MENTION HERE SOME WHERE IN PREVIOUS POST ABOUT A GROUND WIRE IF TOO LONG, COULD ACT OR RADIATE SOME SIGNAL AND BE A PROBLEM. |
Tech833
Moderator
Username: Tech833
Post Number: 1939
Registered: 8-2002
| | Posted on Sunday, March 27, 2011 - 11:58 am: |
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The proper way to ground an antenna mounted upon a non-metallic support (like a phone pole, or tree) is to run a drain wire from the base of the antenna to a ground rod at the base. Then, bond your coax shield at the base to the same rod.
Copper sells a cute little "lightning arrestor" that is really just a PL-259 male on one end, female on the other with a screw terminal on it for connecting a ground wire. That will work well for this. But, the all around best bet would be to install a Polyphaser right at that point.
I have a few antennas with Polyphasers at the base, AND at the cable entry point. Not because multiple Polyphasers makes it "better", just because it was a convenient way of making that ground connection at the support base.
Your radio 'Mythbuster' since 1998
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Charliebrown
Intermediate Member
Username: Charliebrown
Post Number: 166
Registered: 10-2002
| | Posted on Sunday, March 27, 2011 - 3:59 pm: |
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TECH 833, THANK'S FOR THE ANSWER. THIS I WILL DO AS WELL. I HAVE SEEN THE POLYPHASER'S THAT COPPER'S SALE AND THAT IS A GOOD PRICE. FOR OTHER'S HERE THAT READ THIS WHAT WOULD ALSO MAKE THIS EVEN MORE WORTH DOING IS THAT THIS IS ADDED LIGHTNING PROTECTION. CORRECT ME IF I AM WRONG BUT I THINK THAT THE POLYPHASER WILL TAKE STRIKE AFTER STRIKE AND WILL RESET AFTER EACH STRIKE. GOOD WAY TO PROTECT THE CABLE AND RADIO AT THE OTHER END. THANK'S AGAIN 833. ONE CAN ALWAY'S LEARN SOMETHING NEW. 833 PERHAPS YOU NEED TO WRITE A BOOK FOR PEOPLE LIKE ME. YOU COULD MOST LIKELY SELL PLENTY. |
Tech833
Moderator
Username: Tech833
Post Number: 1941
Registered: 8-2002
| | Posted on Monday, March 28, 2011 - 11:24 am: |
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Yes, a Polyphaser will take multiple strikes. It will eventually fail if struck multiple times.
Tech 808 installed a Polyphaser when he put up the Imax 2000 I sent him. It took a direct strike that shredded the antenna as if God took a vegetable peeler to it. No damage to the radios.
And, yes, a book is in the works. I have no idea when or how it will come together, but I already discussed it with the Forummaster, and Copper will have first rights to it if they choose.
Your radio 'Mythbuster' since 1998
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Charliebrown
Intermediate Member
Username: Charliebrown
Post Number: 167
Registered: 10-2002
| | Posted on Tuesday, March 29, 2011 - 6:29 am: |
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GREAT TECH833, I AM LOOKING FORWARD TO GETTING YOUR BOOK WHEN IT IS FINISHED. SOOO MUCH INFORMATION AND GOOD ADVICE TO OWN. A REAL MUST FOR THE PEOPLE IN OUR HOBBY. |
