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[Ham-80211] Ubiquiti SR9

George Rogato wispa at oregonfast.net
Tue Mar 6 05:20:06 UTC 2007

It's being done now:


Not sure about who is certifying these.

Steve wrote:
> 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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George Rogato

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