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[Ham-80211] Ubiquiti SR9

Steve n0fpf at att.net
Tue Mar 6 04:55:33 UTC 2007


It would be really interesting if you can do 900mhz mesh network.
In the Seattle area I could see the noise level of  about -40db to 
-30db in the downtown area. There is a lot of 900Mhz stuff out there 
in an urban area.

gotta watch the rules in that freq range too...

Steve N0FPF


At 12:56 PM 3/5/2007, you 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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