[HamWAN PSDR] VOTE: 900MHz service experiment
Nigel Vander Houwen
nigel at nigelvh.com
Fri Mar 6 10:42:17 PST 2015
Since this expense is in excess of $100, a vote of directors is required.
I vote YAY.
> On Mar 6, 2015, at 10:38, 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 (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.
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