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[Ham-80211] FW: HSMM & WRT54GS

Ralph rwf at bsrg.org
Thu Oct 6 21:40:49 UTC 2005

Yes- you would not be able to use an "access point" for that distance. 
A "bridge" will be required (due to its available distance/timing settings),
or some other way to adjust the timings required (maybe this software you
speak of).
But on an access point, you are lucky to get 7+ miles regardless of how much
power or gain you have.
Using bridges, I easily go 18 miles on part 15 power!


From: ham-80211-bounces at lists.tapr.org
[mailto:ham-80211-bounces at lists.tapr.org] On Behalf Of William P. J.
Sent: Wednesday, October 05, 2005 9:03 AM
To: marc_hsmm at yahoogroups.com
Cc: HSMM-TECHNICAL at listserv.tamu.edu; marcexec at yahoogroups.com;
ham-80211 at lists.tapr.org
Subject: [Ham-80211] FW: HSMM & WRT54GS

an update on some progress.
Thanks for the write up Paul.


From: Paul Hudson [mailto:paul at mcradio.com]
Sent: Tue 10/4/2005 11:35 PM
To: William Bressette VE3WPJ
Cc: David Karecki VE3RER; Richard Govoni VE3SHL; Dana VE3DSS Shtun; John
Lucas VA3JSL
Subject: HSMM & WRT54GS

If you want to post any of the blurb below, such as the bit on the 900 MHz
tests, on the MARC_HSMM, please feel free to do so.
Just an update on the HSMM progress. Richard (VE3SHL) Paul (VE3TA) and David
Hudson went out with Robin (VE3VVS) and William (VE3WPJ) to the Kelso Pit on
September 27. Although the results seemed rather unproductive, we did see
the VE3MIS 2.4 GHz AP with a relatively good signal (16 db SNR without an
amp). That inspired William to return last Saturday and try to connect with
a BBQ parabola and an amplifier. He reported (on the MARC_HSMM Yahoo) that
he had excellent signals but was unable to connect.
One suggestion has been that the delays may need to be increased due to the
longer path (25 KM). I'm not sure but I think it takes 3.2 microseconds for
a signal to travel 1 km so that would be 80 microseconds to travel 25 km,
one way! I believe these delays may be adjustable with the Talisman software
so that could very well solve that problem.
This afternoon (October 4) William got a few 900 Mhz routers operating. I
now have a pair (of 900 MHz Routers) and two small yagis for testing in the
Etobicoke area. This afternoon we had four 900 MHz routers connected in a
three tier setup. With the data rate turned as low as it would go (215 kbs)
we were able to satisfactorily stream Pulse 24 news video and audio while
downloading numerous pictures from various other web sites at acceptable
rates. We tested performance of Global earth which was also great.
We have had difficulty trying to get a link into Mississauga from Etobicoke
and 900 Mhz may be the answer. That could also solve some of the non line of
sight linking issues. Hopefully, the WRT54 routers will still be the main
routers used in the mesh and will have to be the final connection to the
Paul, VE3TA
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