[HamWAN PSDR] VOTE: 900MHz service experiment

Bryan Fields bryan at bryanfields.net
Fri Mar 6 10:50:15 PST 2015

You might want to check out the alvarion fhss 900mhz radios.  You can pickup the su units cheap and convert them to ap's.

You will want to run H pol , check out the old antenna lab, he's got a 900 mhz omni that works well.

Even with this expect only 2 to 3 miles of tree penetration.  

73s W9CR 

On March 6, 2015 1:38:16 PM EST, Bart Kus <me at bartk.us> wrote:
>5.9GHz is awesome when it works.  The speeds are great, and it carries 
>as far as the eye can see with very low ambient noise floor.  It does 
>however have problems when it needs to penetrate trees and buildings.  
>To alleviate this, I'd like HamWAN to offer a slower but deeper 
>penetrating 900MHz service.  900MHz is the lowest frequency ham band 
>without bandwidth or modulation rate restrictions.  Before we deploy a 
>full cell site, I'd like to get some real-world experience with 900MHz 
>penetration, propagation and ambient noise conditions.  Here's the 
>cheapest appropriate hardware we can use for this:
>1x Vpol omni antenna @ $79.50/ea = $79.50 
>2x 9HPn modem @ $108.00/ea = $216.00 
>1x Shipping @ $UNKNOWN (quote not showing?!  Need to call them.) = 
>$40.00 ???
>Total: $335.50
>I already have a 900MHz high gain Yagi-Uda in my inventory and can use 
>that to do various field tests.  These can be directly compared against
>5.9GHz performance since the gear will be deployed to one of our 
>existing 5.9GHz cell sites.  The results of such comparisons will give 
>us a good idea of how well 900MHz might do for HamWAN.
>Disclaimer: These may not be the right modems or antennas for us 
>long-term.  A real deployment might use Ubiquiti Rocket M900 with their
>sector antennas.  These Ubiquiti items are far more expensive though, 
>and their software doesn't integrate as easily into our network, so for
>the purposes of the test I believe the set of hardware I proposed will 
>do well at deploying fast and keeping costs down.
>NOTE: If both the votes are approved, I will combine shipping from 
>Baltic to save money.
>PSDR mailing list
>PSDR at hamwan.org

Bryan Fields
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