John Galt
Forward, March
Premium
join:2004-09-30
Happy Camp
 ·CenturyLink
| reply to kukur
Re: Good looking antenna...
Pacific Wireless has a "blade" sector that looks reasonable in terms of appearance, for under $200:
»www.pacwireless.com/products/sector.shtml
Omni's are fine, as long as you need to radiate in every direction, and if you can stand the noise. I did notice that you have installed a HPOL...do you need to be in that polarization in particular? In my cursory search I could not find an omni HPOL...
A short mast will solve the snow problem. You need to mount it on something anyway. Keep in mind that anything that is up in the air will look smaller than on the ground...so don't let the Wife, or the neighbors, see it "on the ground"...
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A is A |
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kukur
join:2003-10-29
Saint Maries, ID
| John,
Thanks for the reply... I was just on pacwireless site and found they do have a Hpol omni... looks like the blade sector as well.
»pacwireless.com/products/omni.shtml
Do I need Hpol? Dunno. This was/is my first implementation of the Hpol. We have trees, in some places lots of them.
It seemed that even with the roof-in-the-way problem I was getting a good signal. Perhaps this isn't the case with Hpol vs. Vpol, but I found that I either had a good signal, or I didn't... unlike with the current Vpol APs we have now which can get iffy.
I will take a look at that sector.
Thanks again. |
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kukur
join:2003-10-29
Saint Maries, ID
| reply to John Galt
Would we be better off trying a 180* "sector?"
All they really are is an omni with a shield most of the time correct?
Is there much difference in performance between an omni and a 180*?
»pacwireless.com/products/images/···0-12.jpg |
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John Galt
Forward, March
Premium
join:2004-09-30
Happy Camp | 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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superdog
I Need A Drink
Premium,MVM
join:2001-07-13
Lebanon, PA
| reply to John Galt
said by John Galt : In my cursory search I could not find an omni HPOL... See our friends at Winncomm. I have one in service from them and it is the best thing next to sliced bread. It is Russian made(As are a lot of Winncomm antennas) and it weighs about 7 pounds. I am sure it is a slotted waveguide with a heavy duty mount and cover. It appears that this thing could take a few bullets and still work. The downside is cost, as I have $450 in it, but it sure is a great way to set a small PoP up in a high noise environment.:)
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