John Galt
Forward, March
Premium
join:2004-09-30
Happy Camp | reply to kukur
Re: Good looking antenna...
A 180 degree sector will have 3 dB more gain than an omni, typically. If you don't need to feed in the other direction, you might as well use the sector.
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A is A |
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kukur
join:2003-10-29
Saint Maries, ID | John,
At 2 miles +-, with the location of the AP on a slight hill, would you recommend going with a lower 9 dbi - and get a wider beam, or do you think I would need the extra gain to reach that far?
Thanks again |
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John Galt
Forward, March
Premium
join:2004-09-30
Happy Camp | It depends what your objective is...are you needing to provide signal to a number of subs in the served area, or just a PtP link to another site?
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A is A |
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kukur
join:2003-10-29
Saint Maries, ID
| This is a multipoint AP location - Probably not more than 20 users.
We are trying to get into a dogleg area our current towers can't reach into.
There is a small (40 house) development we are trying to reach that begins at 1.4 miles and ends right aroung 2 miles.
One other customer (business) is located about 90* +- from that housing development that wants internet as well. This customer is slightly elevated compared to the development, but not higher than the AP will be. |
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John Galt
Forward, March
Premium
join:2004-09-30
Happy Camp
 ·CenturyLink
| You need to do a link calculation...that will tell you if the 9 dB is sufficient to service the far end of the development.
»my.athenet.net/~multiplx/cgi-bin···main.cgi
Use the furthest distance in the calc...this appears to be a bit daunting, but work through it....it is not that bad.
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kukur
join:2003-10-29
Saint Maries, ID
2 edits | John,
Forgive my ineptness... I plugged all the numbers into the link you gave me and got a spew of numbers out, but couldn't find anything that said.. "you can go X distance."
So I found this site...
»www.signull.com/fsc.php
And put in these numbers...
Tx Pwr 15dbm (200mw)
Rx sensitivty 89 dbm (per Tranzeo)
TX Gain 9dbi
Rx Gain 15dbi (per Tranzeo)
Tx Cable Loss - 1 db (15ft)
Rx Cable Loss - 0 db (integrated)
Signal Margin - 15db (not sure what this should be)
I was given the response...
Total Gain 120 - Max Distance 6.16 miles
Does this look/sound right?
What is a good Signal Margin suppose to be?
Thanks for taking the time on this...
Lawrence |
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John Galt
Forward, March
Premium
join:2004-09-30
Happy Camp
·CenturyLink
| said by kukur  :Thanks for taking the time on this... Glad I could help...
It looks OK to me. The Signal Margin is related to fade...from heavy rain, for example. More is better, 20 dB is great, 10 dB is marginal, so it looks like you are right in between. Remember, that is for the maximum distance of the link...if the link is shorter, the margin improves the closer you get.
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A is A |
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kukur
join:2003-10-29
Saint Maries, ID | Great!
I ran the numbers after reading up on Signal Margin. with 22 dbm margin I can hit 2.75 miles.
So it looks like I am going to give the Hpol omni a try and see how it works for us.
Appreciate all the info. |
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John Galt
Forward, March
Premium
join:2004-09-30
Happy Camp | |
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