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[Ham-80211] Ubiquiti SR9

George Rogato wispa at oregonfast.net
Tue Mar 6 01:57:52 UTC 2007

Hi Steve, the wisps have been using sr9's for a few months now.
There have been good reports about them.
Problem is for some wisps is they are not certified with anything at 
this point.

Hope this is helpful.


Steve wrote:
> Alright, perhaps I should have posted more about it.
> http://www.ubnt.com/sr9_faq.php4
> http://www.wlanparts.com/product/SR9
> It's about the same price as the Aerocomm ConnexLink, but a lot faster. 
> At almost a watt, comparable power.  While the Aerocomm units are FHSS, 
> these are not, they are 802.11 like clones, so you can have them in 
> 802.11b  = DSSS or 802.11g = OFDM.
> I found a new notes:
> There are a few requirements one must follow with SR9 cards, that have 
> been pointed out by Ubiquiti:
> *) The card does not perform well if rate exceeds 18Mbps
> *) 802.11b mode is recommended, as 802.11g is very prone to interference 
> with the SR9
> *) You must use long preamble at all times
> This persons testing has shown that the optimal TX power setting is 15.
> I stumbled into only one other report so far.  Where they "punched 5 
> miles through some trees and houses.  Using attic mounted antennas 
> (13db) and the Ubiquiti SR9 cards they could get a signal to noise 
> between 10 and 20 and move a couple of megs of data at the home."
> Since 2.4 is so trashed, this is interesting.  And I'd like to hear more 
> reports where people use them in similar "less than ideal" situations.  
> I noticed they sell a 900MHz Cavity Filter, so that makes you wonder if 
> thats going to be needed or for just really bad areas...
> You could add a 3 watt Hyperlink bidierectional amp to it, for plug and 
> play people.  It really boils down to how well it does with other near 
> by signals.  But even with that pricey amp, you beat the price 
> comparison to a D-Star ID-1 setup.
> Those are my thoughts.  I'd like to hear more about it.
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George Rogato

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