[HamWAN PSDR] VOTE: 900MHz service experiment

Ryan Elliott Turner ryan.e.t at gmail.com
Fri Mar 6 10:49:03 PST 2015

Thanks, Bart. I vote yay.

On Fri, Mar 6, 2015 at 12:47 PM, gary.k7ek at yahoo.com <gary.k7ek at yahoo.com>

>  I'd be interested in experimenting with 900 mhz gear at my Spanaway
> residence, and possibly at my Graham Hill repeater site. I believe 900 mhz
> would provide better overall results than 5 Ghz, which proved to be
> marginal to barely usable during our recent site survey.
> Best regards,
> Gary, K7EK
> Sent from my Verizon Wireless 4G LTE Smartphone
> ----- Reply message -----
> From: "Bart Kus" <me at bartk.us>
> To: "Puget Sound Data Ring" <psdr at hamwan.org>
> Subject: [HamWAN PSDR] VOTE: 900MHz service experiment
> Date: Fri, Mar 6, 2015 10:38
> 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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Ryan Turner
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