| Author |
Message |
    
Pp1616
Junior Member
Username: Pp1616
Post Number: 23
Registered: 2-2004
| | Posted on Monday, March 01, 2004 - 11:32 am: | 
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im going to be seting up a m103 if i remember right and this is my first time seting up somthing that has to move around! i want to know whats the best way to run coax and whats the best way to ground every thing thanks. p.s i will also be runing a a99 above for talking local thanks =)
protegee pig 1616
cef301 |
Ca346
Advanced Member
Username: Ca346
Post Number: 614
Registered: 8-2003
| | Posted on Monday, March 01, 2004 - 8:16 pm: |
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I have a 5 ft section below the antenna that is not connected to the tower (mast). I did connect two ties to the antenna boom to help with strain of the weight of the coax on the way down. It allows the antenna to swing 360 degrees and does not hang up. From there down the tower it is tied about every 10 ft. |
Nlmadog
Junior Member
Username: Nlmadog
Post Number: 33
Registered: 1-2004
| | Posted on Saturday, March 06, 2004 - 10:18 pm: |
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I pulled my coax down the mast,tied down with cable ties,stopped about 2 foot from the neck of the tower and made a half loop with the coax at the tower neck.My mast drops through the tower to a rotor on a plate.My half loop probably sticks away from the tower about a foot and half. I had a friend check while I rotated the beam to make sure the coax did not pull tight as it moved.Good to go.2 grounding rods on the tower legs.Some guys say to take the coax to the gound then into the house.If anyone has an explanation let me know.My coax goes into the attic,then down the wall in the office.No tvi and I have an earth ground in the office but I also do not run power. |
Cm3885
Intermediate Member
Username: Cm3885
Post Number: 239
Registered: 12-2003
| | Posted on Saturday, March 06, 2004 - 11:36 pm: |
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Mines set up like yours. I have my coax going from the beams down the tower and then loops for the turning radius and into the attic and into the radio room.. Plus ground rods at the base of the tower for added protection. I use 2 rotor bearings on plates above my ham 4 kinda overkill but they work... |
Tech808
Moderator
Username: Tech808
Post Number: 1713
Registered: 8-2002
| | Posted on Sunday, March 07, 2004 - 1:14 am: |
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My Set up is Beams mounted 9 feet above top of tower, then Rotor Thrust bearing mounted at bottom of Top section of tower.
Coax loop for antenna and then coax running down out side of leg of tower with UV Wire Ties.
Then 25' down 4' stand off for 2 Meter Antenna, and Ground Plane.
Mast pipe running down to Rotor Mounted at Roof Level. With NO Weight on Rotor.
That way if I need to remove rotor for any work it make's it easy. Unbolt rotor coller and leave on antenna and remove rotor.
Then Coax run's last 12' inside of 2 1/2 inch White Plastic PVC Pipe with Elbow and drain on bottom running into house.
I use Three 10' Ground rod's with one attached to each leg of tower and all three legs tied together.
Coax from Antenna is connected to Poly Phaser's and grounded to a Separate Ground rod that I have less than 5 feet from Radio Equipment outside of window and then ran to radio room.
It might be OVERKILL but It sure make's Me and the Insurance Company feel better. 
Lon
Tech808 |
Ozzie
Intermediate Member
Username: Ozzie
Post Number: 116
Registered: 11-2003
| | Posted on Sunday, March 07, 2004 - 9:46 am: |
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Hey Tech808,
I came across (back in 87) a commercial installation for a Maritime rescue group (in Australia) that had a 65ft street lamp stand as as tower sitting about 5ft, at the base, from the radio room. only grounding was the bolts imbedded in the concrete. A disaster just waiting to happen. |
Pp1616
Junior Member
Username: Pp1616
Post Number: 43
Registered: 2-2004
| | Posted on Sunday, March 07, 2004 - 1:40 pm: |
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how should i go about puting the a99 over the beam. how far over the beam should i mount it |
Tech808
Moderator
Username: Tech808
Post Number: 1716
Registered: 8-2002
| | Posted on Sunday, March 07, 2004 - 1:49 pm: |
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Mount it above the Tip by 2 or 3 feet above the tallest element of the beam.
Mount A99 on Top and then lower Mount Beam and use GOOD Heavy Mast Pipe for top section of mast pipe. |
Pp1616
Junior Member
Username: Pp1616
Post Number: 44
Registered: 2-2004
| | Posted on Monday, March 08, 2004 - 9:31 am: |
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thanks alot Lon. one more ? i just thought of, would the beam act like a ground plain runing horizontal?? im going to be runing it for skip (cant wait to get it up for the nets ) so i was told to run it horizontal. just a thought =) |
Tech808
Moderator
Username: Tech808
Post Number: 1729
Registered: 8-2002
| | Posted on Monday, March 08, 2004 - 11:31 am: |
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Depending on Which Beam you choose, the Side & Back Rejection will pretty much not make it a good Ground Plane antenna.
With mine I can hear Local's from the side's but there signal is Cut by almost 2/3rd's.
If I have mine pointed at them I can get an S-10 or S-20 and if they are off of the Back of the Beam's maybe an S-3 to S-5 and if they are 10 miles away I might be able to hear them if it is REALLY QUIET, but Barely with no S meter reading.
Even with Beam's I HIGHLY RECOMMEND a Good Ground Plane Antenna as it is a BIG PLUS to hear those other signal's or weak signal's out there and then swing / switch the beam's to them.
Lon
Tech808 |
Pp1616
Junior Member
Username: Pp1616
Post Number: 49
Registered: 2-2004
| | Posted on Monday, March 08, 2004 - 12:14 pm: |
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ill be runing the a99 or soon might get somthing to replace the a99. but i was just woundering if the beam would act like a ground plane when im using the a99 mounted above it |
Highlander
Intermediate Member
Username: Highlander
Post Number: 437
Registered: 12-2001
| | Posted on Monday, March 08, 2004 - 3:48 pm: |
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Pp1616, yes, the beam will act as a ground plane for the A99 mounted above it. |
