| Author |
Message |
    
Arcangelny
| | Posted on Wednesday, July 02, 2003 - 11:07 pm: | 
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I have an antenna mounted to my chimney now. Want to put another up with a tripod on the flat part of the roof. How do I locate the beams to mount the tripod? Are lag screws the best to use? Standard RTV Silicone acceptable for sealing screws?
Thanks! |
Tech833
| | Posted on Wednesday, July 02, 2003 - 11:39 pm: |
|
Locating the beams is best done with a tape measure and patience. Stud finders do not work well. Lag screws are O.K., but bolting through the beams with fender washers and nylock nuts is best. Marine silicone from West Marine is my first choice. Check out Sikaflex brand. |
Tech808
| | Posted on Thursday, July 03, 2003 - 12:26 am: |
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Arcangelny,
If you measure from the edge of roof most Roof Studs are a 24" or 16" center.
Lon
Tech808 |
Arcangelny
| | Posted on Friday, July 04, 2003 - 1:09 am: |
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Thanks to both 808 and 833!
Have a boat never thought o use the marine stuff... Must be better in the weather. Live in a 2 family here in NYC. No attic. Upper apartment is ceiling to roof. No space in between... so cannot bolt through...
I was thinking of adding a steel strap (2" X 1/8")across the foot of the tripod putting three holes across. Have been told this will be a waste of time since only the center hole will be in a stud.
Also antenna will be a Super Scanner on a 10'-15'
mast. Tripod is 9 or 10 feet, and fairly heavy duty. Will this rig be stable enough without guy wires? I have no room on the roof (this is NYC and we have narrow houses). When I purchased the Tripod I was told going 5-10 feet above the tripod would not need to be wired. However was given some bad info by this fellow before...
Will be attempting this next week (weather permitting) with my sons... |
Tech833
| | Posted on Friday, July 04, 2003 - 12:57 pm: |
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The Super Scanner has a lot of windload. I would not attempt this without some guying, especially since you cannot bolt all the way through. Use nylon rope (sorry, 'line') from the local Marine store. Coat it with thick wax. That will keep it from being waterlogged. |
Bruce
| | Posted on Saturday, October 25, 2003 - 10:10 pm: |
|
Well my 4 band ( 40-10 ) Hustler vertical is up
the top is almost 40 foot up ...... and this is ground zero for lighting so im a bit squemish. First tests with just a few radles
10 meters entire band .... even cb with under 2/1
15 its tuned too low but should be under 2/1
20 way low
40 out to lunch
now to cut 20 and 40 meter radiles and get it tuned up on thoes bands 10 is ausm gosh i went on 28.35 and 29.6 without changing antennas!
Sofar best $130 ive spent on a antenna in a long time! |
Climber
| | Posted on Sunday, October 26, 2003 - 12:13 am: |
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Bruce,
What are some spec's on the 4 band "Hustler Vertical" antenna.
Not familar with it, results with more testing?
Climber |
Bruce
| | Posted on Sunday, October 26, 2003 - 8:02 am: |
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If your a ham and like me have limited space the Model 4-BTV has been made about 40 years it is not a gain antenna but as well as it works for me i dont care. It is 1/4 wave at all frequencys uses traps ( forget the loss stuff they work ) is well made and stands 21 foot+ tall. I got tired of tring " all band dipoles " and except for my fear of lighting i would have gone this route a long time ago. It requires ground radles at least 2 for each band and they are touchy but wow for a simple ant this thing works good. On 20 meters it is tunned uo for 13.8..... radiles are too long but even so at 14.3 it is still under 2/1 meaning as soon as i get everything tqeeked it will cover ALL of even 20 meters. since it is a free standing radiator ( here goes my lighting fears again) you can run it with a antenna tunner on other bands such as 12 and 17..... my MFJ-945 was happy. And best part it retails for about $125 the gap was $275 MFJ $200 and hygain $250.
Yep im a happy camper..... |
