[HamWAN PSDR] VOTE: 900MHz service experiment
bryan at bryanfields.net
Fri Mar 6 11:07:07 PST 2015
Bart, they are only viable as second hand items. It was the first gen wisp gear circa 2002, And they can't give the away on eBay. 2mhz channel and gfsk modulation, about 1.6 mbit/s. Gfsk can use a class c amp too....
Bsc in st Louis has over 1k of the modems in stock last I spoke with them.
I'm happy to provide tech support and firmware for your group on these, and how to convert them to ap units.
I can see if I have a contact for OAL when i get home. I can't stress enough how H pol will make a difference for you, or at least did for me.
OAL makes a H pol mobile wheel antenna too.
For ham radio it's hard to beat cheap😀
On March 6, 2015 1:57:03 PM EST, Bart Kus <me at bartk.us> wrote:
>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.
>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
>> 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
>> as far as the eye can see with very low ambient noise floor. It
>> however have problems when it needs to penetrate trees and
>> To alleviate this, I'd like HamWAN to offer a slower but deeper
>> penetrating 900MHz service. 900MHz is the lowest frequency ham
>> without bandwidth or modulation rate restrictions. Before we
>> full cell site, I'd like to get some real-world experience with
>> penetration, propagation and ambient noise conditions. Here's
>> 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
>> that to do various field tests. These can be directly compared
>> 5.9GHz performance since the gear will be deployed to one of our
>> existing 5.9GHz cell sites. The results of such comparisons will
>> 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
>> sector antennas. These Ubiquiti items are far more expensive
>> and their software doesn't integrate as easily into our network,
>> the purposes of the test I believe the set of hardware I proposed
>> do well at deploying fast and keeping costs down.
>> NOTE: If both the votes are approved, I will combine shipping
>> Baltic to save money.
>> PSDR mailing list
>> PSDR at hamwan.org
>> Bryan Fields
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