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[Ham-80211] NLOS on 33 cm

ZPO geekdownrange at gmail.com
Mon Apr 12 04:00:21 UTC 2010


I'd be interested to see what performance looks like running a 20MHz
(or 10MHz channel) and locking the datarate at 6Mbps.  Based on the
datasheet, they appear to be using the typical 802.11a/g modulation
steps.  6Mbps would put it at BPSK with a 1/2 rate FEC.  At the 5MHz
channel width, I'll take a SWAG the unit is running QPSK-3/4.  I would
only recommend this for a short test though.  It would be rather "band
unfriendly" for more than a short period in an isolated area.

The lowest datarate listed in the datasheet is 6Mbps.  There are radio
specs down to DSSS 1Mbps (802.11b).  I don't suppose the unit manuals
have any more info at the modulation parameters at various datarates?


On Sun, Apr 11, 2010 at 7:11 PM, Steve <kb9mwr at yahoo.com> wrote:
> I haven't done a ton of testing of the XR9.  But the preliminary report is
> about a mile NLOS, using a 5 MHz channel, with a base station at 35 feet into a 6-dBd omni antenna and a magnet-mounted antenna on the car.  Usable connectivity is a bit less than that.
> Not exactly impressive, but I wanted to share that.  I'm sure things will be more successful when I get around to sticking a yagi up in the air at a few locations.
> For comparison:
> With the AeroComm I reported solid mobile coverage for about 5 miles.  And was had non-solid for out to about 7 miles.
> To be expected as the data rate is substantially better with the XR9... so there is your trade off.
> If you are looking for a NLOS solution, may I direct your attention to something for the 70cm band:
> http://www.xagyl.com/store/product.php?productid=16450&cat=251&page=1
> This was recently brought to my attention, and is Very Interesting.  I am hoping to get in touch with XAGYL in the next few days to see what else I can learn.
> XAGYL Communications, appears to be a Canadian Distributor of Ultra High-Speed, Long Range Wireless equipment.  It looks like about a year ago they partnered with Doodle Labs, a privately held manufacturing company with headquarters in Singapore to design and manufacture a new line of long range Wireless Data Transceiver devices.
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