I would second this suggestion I have used the MT in Ham bands as well.
You can add 2 cards in a RBM33G and run it in dual Nstream no need for
tdma protocol it makes one TX and one RX radio and have a single TX
chain with two RX chains for your diversity.
On 8/28/2018 10:31 AM, Colin Stanners wrote:
Our project is using Ubiquiti / Mikrotik 802.11A/G and sometimes N
equipment, international versions that can run in the ham bands. AREDN
seemed to lack a TDMA protocol last time I checked so wouldn't be good
for higher traffic cases or to keep low packet loss. I'm trying to
keep the space diversity in-radio as often the radios can switch
between streams in <1 second, while most networking designs that use
multiple radios for diversity (e.g. OSPF) can take seconds to a minute
to switch, in some fast-fade cases that can cause prolonged annoyance
due to constant switching.
On Tue, Aug 28, 2018 at 10:17 AM Brian Webster
<i...@wirelessmapping.com <mailto:i...@wirelessmapping.com>> wrote:
Which equipment are you using in the ham bands? Have you looked at
the AREDN project? https://www.arednmesh.org/ They use mostly
Ubiquiti gear with new firmware loads to move the radios to the
ham licensed portions of the bands away from unlicensed. The
rocket AP’s are one of the models that can load the firmware. Can
you achieve what you want by using multiple antennas on a rocket
AP? With the AREDN firmware the radios are cheap enough that you
could do frequency diversity by having both 5 GHz and 3.5 GHz
radios between the sites or if desired 2.4 GHz (in the licensed
ham portion of the band below unlicensed) or even 900 MHz (of
which ham are primary licensed over unlicensed users with a lot
more power allowed). I am a fan of the AREDN stuff because of the
clean spectrum available and that it doesn’t bother the WISP
deployments. We have been using it for short haul temp stuff like
remote video feeds on race courses for public safety events. It is
a true mesh platform so if your sites are able to see more than
one location from the tower and a particular link goes down, it
will re-route traffic on its own.
Thank You,
Brian Webster
*From:*AF [mailto:af-boun...@af.afmug.com
<mailto:af-boun...@af.afmug.com>] *On Behalf Of *Colin Stanners
*Sent:* Monday, August 27, 2018 11:53 PM
*To:* AnimalFarm Microwave Users Group
*Subject:* [AFMUG] 5.8Ghz / hackable 5.9Ghz (for hams) spatial
diversity on the cheap?
In our province there is a wide-area analog voice ham repeater
system that's really old-fashioned; some of the radio gear is
older than I am. Some more progressive members are pushing to have
IP backhaul at all sites. The 2.3Ghz / 5.9Ghz
donated-wifi-gear-hacked-to-ham-frequencies group of which I'm a
main tech has started building a relatively impressive IP network
in the Winnipeg area and so I've been asked to prepare suggestions
for the 5.9Ghz IP backhaul upgrades.
The big cost difficulty is doing spatial diversity; there are many
longer links that will definitely require it for reliability
through the fade season. At my fulltime WISP job, if the budget is
$10-15K/link I'll just put in a PTP670 with spatial diversity or
11Ghz radios with 4ft dishes and things are great. But being a
nonprofit ham group, this entire project of a dozen+ links is
hoped to be <$10K at most (with some donations) for hardware...
That's a lot harder.
So I'm trying to find if there are any radios that are good at
spatial diversity like the Orthogons, but cheap (prefer
<$200/radio, $400 max?), and either support 5.9Ghz or are
"hackable" to it (while supporting ham requirements e.g. callsign
advertisement). Speed is not very important.
-PTP650/670 way out of price range, PTP450x, PTP550 too.
-AF5X did not do spatial diversity in my tests.
-AF5XHD I have never tested for SD, even if it does work the
radios are on the expensive side
-ePMP connectorized I like as a cost-effective platform, but it's
not advertised for spatial diversity, and the firmware had some
distance limits
-general Ubiquiti wi-fi I've never tested for spatial diversity
but is worth a try
-Mimosa platform I've never touched but probably worth researching.
-Orthogon PTP400s I've used extensively, they are cheap now (used)
and do spatial diversity great, but aren't hackable to 5.9Ghz. And
as the hardware gets old, there will be failures.
Any other suggestions?
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