[HamWAN PSDR] VOTE: 900MHz service experiment

[Bart Kus]

Please provide an URL can we could source these from.  I don't wanna 
take a dependency on any 2nd hand market stuff.

Yes, H pol will work a lot better, but V pol is the only viable option 
for mobile.  Therefore, I'm choosing to focus this test on V pol.

--Bart


On 3/6/2015 10:50 AM, Bryan Fields wrote:
> 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:
>
>     Hello,
>
>     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
>     (http://www.balticnetworks.com/laird-antenna-omni-8dbi-900mhz-n-female-integrated.html)
>     2x 9HPn modem @ $108.00/ea = $216.00
>     (http://www.balticnetworks.com/mikrotik-metal-9hpn.html)
>     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.
>
>     --Bart
>
>     ------------------------------------------------------------------------
>
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>
>
> --
> Bryan Fields
> 727-409-1194
> http://bryanfields.net 

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