| Author |
Message |
    
Mikefromms
Intermediate Member
Username: Mikefromms
Post Number: 397
Registered: 6-2003
| | Posted on Thursday, January 27, 2005 - 6:25 pm: | 
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How much increase in receive and getting out ability should I expect from my Imax 2000 when I go from 10 feet at the base to around 70+ at the base of the antenna? Give me your experiences and estimates. Coax will not factor in negatively because it will be LMR-400.
mikefromms |
Racer X (Unregistered Guest)
Unregistered guest
| | Posted on Thursday, January 27, 2005 - 6:36 pm: |
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It depends entirely on your local terrain so other's experiences won't be applicable as your location is unique. I've got to guess that at 10' you've got lots of local obstructions around the antenna and you'll see a large gain in performance and reduction in noise too. |
Mikefromms
Intermediate Member
Username: Mikefromms
Post Number: 398
Registered: 6-2003
| | Posted on Thursday, January 27, 2005 - 9:13 pm: |
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Terrian is good but the house is blocking my testing site. I'll add the gdp/kit before it goes in the tree.
Let's keep it going.
mikefromms |
Tech833
Moderator
Username: Tech833
Post Number: 972
Registered: 8-2002
| | Posted on Friday, January 28, 2005 - 12:25 am: |
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By raising the antenna to 70 feet AGL, you will lower the takeoff angle dramatically. Your local coverage will increase by about 4X and your DX performance will increase noticeably. |
Bruce
Senior Member
Username: Bruce
Post Number: 2144
Registered: 9-2003
| | Posted on Friday, January 28, 2005 - 9:09 am: |
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Rough rule of antenna hight gain
distance to horizon = (1.4 * (sqroot) hight ))
so a 25 foot high antenna would have 7 miles to horizon
a 100 foot high one would have about 14 miles |
Pig040
Advanced Member
Username: Pig040
Post Number: 659
Registered: 7-2003
| | Posted on Friday, January 28, 2005 - 11:14 am: |
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Whoa Bruce I love it when you talk fancy!
Rich |
Airplane1
Intermediate Member
Username: Airplane1
Post Number: 273
Registered: 5-2004
| | Posted on Friday, January 28, 2005 - 2:09 pm: |
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Can I give a question kinda like the one original question? My MaCo V is at 7ft to feed point, if I put it up tp 36ft or higher to feed point will there be a big change? will I still be able to talk 35-40 miles to people I talk to now? will they hear me better or will it hurt the talking distance I talk now but help DXing or both?
airplane |
Racer X (Unregistered Guest)
Unregistered guest
| | Posted on Friday, January 28, 2005 - 3:47 pm: |
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Bruce - Did you forget to double the height in that formula? |
Tech808
Moderator
Username: Tech808
Post Number: 4662
Registered: 8-2002
| | Posted on Friday, January 28, 2005 - 4:30 pm: |
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Airplane1,
Read Tech833's post just 3 above your post for your answer.
The HIGHER the BETTER with any antenna no matter what kind it is. 
Hope this helps,
Lon
Tech808
CEF808
N9OSN |
Mikefromms
Intermediate Member
Username: Mikefromms
Post Number: 403
Registered: 6-2003
| | Posted on Friday, January 28, 2005 - 6:30 pm: |
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If this Imax improves with height as my old super big stick did in the 80's then I'm in for some serious distance talking.
mikefromms |
Airplane1
Intermediate Member
Username: Airplane1
Post Number: 274
Registered: 5-2004
| | Posted on Friday, January 28, 2005 - 6:40 pm: |
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Thanks Lon. I seen that, just asking.
I plan on putting it up this sring and cant wait to hear the difference.
airplane |
