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Stupid Wifi Propagation Q ;-)

 
 
Richard Perkin
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      02-02-2005, 12:03 PM
"helpster" <(E-Mail Removed)> wrote in
news:RNednXW9LbNBJ53fRVn-(E-Mail Removed):

> Where does one find the Satori firmware? Ive seen it referenced
> twice in the last 2 days and am interested in seeing what it is
> all about. Thanks


<http://www.sveasoft.com/>
or one of the several download mirors.

Hope this helps

--

Richard Perkin
To email me, change the AT in the address below
richard.perkinATmyrealbox.com

It's is not, it isn't ain't, and it's it's, not its, if you mean it
is. If you don't, it's its. Then too, it's hers. It isn't her's.
It isn't our's either. It's ours, and likewise yours and theirs.
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LT
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      02-02-2005, 03:08 PM
How is the Satori different from Hyperwrt? Which one is recommended?
Thx
LT


"Richard Perkin" <(E-Mail Removed)> wrote in message
news:Xns95F17AAE22DBBfnurdle@130.133.1.4...
> "helpster" <(E-Mail Removed)> wrote in
> news:RNednXW9LbNBJ53fRVn-(E-Mail Removed):
>
> > Where does one find the Satori firmware? Ive seen it referenced
> > twice in the last 2 days and am interested in seeing what it is
> > all about. Thanks

>
> <http://www.sveasoft.com/>
> or one of the several download mirors.
>
> Hope this helps
>
> --
>
> Richard Perkin
> To email me, change the AT in the address below
> richard.perkinATmyrealbox.com
>
> It's is not, it isn't ain't, and it's it's, not its, if you mean it
> is. If you don't, it's its. Then too, it's hers. It isn't her's.
> It isn't our's either. It's ours, and likewise yours and theirs.
> -- Oxford University Press, Edpress News



 
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nospam
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      02-02-2005, 05:21 PM
In article <Fs-dnVX_1rSfcZ3fRVn-(E-Mail Removed)>, LT
<(E-Mail Removed)> wrote:

> How is the Satori different from Hyperwrt? Which one is recommended?
> Thx


there are quite a number of third party firmwares available, each of
which have a different feature set. it all depends what you want to do.


hyperwrt adds a few things and fixes a bunch of bugs. nothing fancy,
but quite reliable.

satori and its follow on, alchemy, add a *lot* of features and they are
somewhat buggy. also, many people are not happy with how sveasoft
conducts business.

there are quite a number of other alternatives. check out:
<http://www.linksysinfo.org>
 
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Floyd L. Davidson
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      02-02-2005, 07:42 PM
"helpster" <(E-Mail Removed)> wrote:
>Where does one find the Satori firmware? Ive seen it referenced twice in the
>last 2 days and am interested in seeing what it is all about. Thanks


There are at least two third party firmware packages for the
WRT54G (and the many other units that are essentially identical).
Sveasoft makes Satori (http://www/sveasoft.com, which also has a
beta version under development that is available by subscription
only, for $20). HyperDrive makes HyperWRT for the WRT54G and
HyperWAP for the WAP54G (http://www.hyperdrive.be).

HyperWRT makes some things easier, and Satori has a more
features.

LinkSys used a Linux based system running on a little MIPS CPU
from Broadcom. They didn't quite understand the legalities of
the GPL to start with, but at this time they have that well in
hand. LinkSys (owned by Cisco) releases the source code to all
of the GPL's code, and makes it available on a CD for something
like $10 a copy. Others start with that base software and both
add software features and find ways to enable undocumented
hardware features.

The most significant features are:

1) Shell access via telnet.
2) Tx Power adjustment 0-251 mW (default is 28 mW).
3) Antenna select configuration.
4) Finer control of firewall.
5) Startup scripts.
6) Use as Access Point, Client, or Repeater.

For anyone familiar Unix, the added functionality is instantly
available. For example, using the stock firmware's web
interface there is no way to determine received signal strength,
which is necessary to align high gain antennas, but with the
ability to get a shell command line a little exploring shows
that the received signal strength of any client is available
with the command "wl rssi MAC", where "MAC" is the MAC address
of connected client. But, it also turns out that signal
strength reports are averaged over time. Hence, to adjust an
antenna means watching for a minute or so after each change.
I've been using a command that shows the received signal
strength every ten seconds,

while true ; do wl rssi 00:00:00:00:00:00 ; sleep 10 ; done

Where the "00: ..." is replaced with a real MAC address. But
actually, I have that command written into an init file for the
root user, and rather than type all of that out, for each of the
normally connected client units I can just type in "rssi host",
using the hostname of that client, and get signal level readouts
every 10 seconds.

Obviously the functionality of a WRT54G is increased several
times by using the third party firmware. (And it's a fun toy
too... ;-)

--
Floyd L. Davidson <http://web.newsguy.com/floyd_davidson>
Ukpeagvik (Barrow, Alaska) (E-Mail Removed)
 
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Jeff Liebermann
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      02-02-2005, 10:28 PM
On Tue, 01 Feb 2005 23:22:03 -0900, (E-Mail Removed) (Floyd L.
Davidson) wrote:

>I wasn't sure what kind of a regulator was being used, and
>that's why I kind of hedged a bit above and said "Or the 12 vdc
>... if...". With a switching regulator that will handle 25
>volts, one need not be too worried, and I'd expect it would work
>fairly well directly off a 12 volts system in a car.


Well...the WRT54G autopsy page doesn't show the regulators too
clearly.

http://www.linksysinfo.org/modules.p...showpage&pid=6
So, I tear open my WRT54Gv1.1 and find an Anachip AC 1501-33
regulator. That's a fixed 3.3VDC 5A 150Khz regulator.
http://www.anachip.com/downloads/dat...eg/AP1501A.pdf
Maximum input voltage is 45VDC and is apparently characterized to
40VDC input. Nifty.

However, the input cazapitor is only rated at 25VDC. Looks like an
85C electrolytic, which will derate to about 18VDC with the typical
temperatures found in an outdoor box. I would say that 12VDC battery
or solar operation is certainly possible, but I wouldn't try 24VDC.

Also, I forgot to mention another advantage of the wide operating
voltage range. You don't really need PoE. You can place a
considerable run of CAT5 cable, with whatever series resistance it
contributes, and not worry (much) about the operating voltage. Use
the supplied 12VDC wall wart, loose some voltage drop in the CAT5
wire, and the until will still run just fine on a lower voltage.

>> http://www.LearnByDestroying/pics/dr.../low-volt.html

> http://members.cruzio.com/~jeffl//pi.../low-volt.html


Argh. Thanks.

>That answered every question that I had. I've been thinking about
>something similar to the OP's description, except with a fairly mobile
>remote unit.


Yep. That should work. One gel cell, a 10-15watt solar array, and
some kind of charge controller. However, at your latitude, the solar
charger will only work 6 months out of the year.

>The immediate thing that caught my attention was the
>idea that one of these WRT54G units could be battery operated from
>a vehicle, and with 3rd party firmware act as a repeater. That means
>the laptop itself need only be within range of the WRT54G, which can
>have a high gain external antenna.


Yep. That will work. There are SUV's around with complete computah
networks, satellite internet, and of course, 802.11 connectivity. One
of the local emergency vehicles has mobile file server (big hard disk)
and uses 802.11 to connect to remote laptops. When we did the
original proposal, I specified a 12/12V DC to DC converter as I
assumed that the access point required exactly 12.0VDC to operate.
We'll be switching from 802.11b to 802.11g fairly soon, so I'll
probalby opt for a WAP54G and run it directly (though some LC
filtering) from the battery power.

>Your information is very useful!


Yep. Information, not opinions.

--
# Jeff Liebermann 150 Felker St #D Santa Cruz CA 95060
# 831.336.2558 voice http://www.LearnByDestroying.com
# (E-Mail Removed)
# (E-Mail Removed) AE6KS
 
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Jeff Liebermann
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      02-02-2005, 11:47 PM
On Wed, 02 Feb 2005 22:28:45 GMT, Jeff Liebermann
<(E-Mail Removed)> wrote:

>So, I tear open my WRT54Gv1.1 and find an Anachip AC 1501-33
>regulator. That's a fixed 3.3VDC 5A 150Khz regulator.
> http://www.anachip.com/downloads/dat...eg/AP1501A.pdf
>Maximum input voltage is 45VDC and is apparently characterized to
>40VDC input. Nifty.


Argh. It's not the "A" version. It's a 3A regulator instead of a 5A.
http://www.anachip.com/downloads/dat...reg/AP1501.pdf


--
# Jeff Liebermann 150 Felker St #D Santa Cruz CA 95060
# 831.336.2558 voice http://www.LearnByDestroying.com
# (E-Mail Removed)
# (E-Mail Removed) AE6KS
 
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Jeff Liebermann
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      02-03-2005, 05:08 AM
On Tue, 01 Feb 2005 23:22:03 -0900, (E-Mail Removed) (Floyd L.
Davidson) wrote:

>That answered every question that I had. I've been thinking about
>something similar to the OP's description, except with a fairly mobile
>remote unit. The immediate thing that caught my attention was the
>idea that one of these WRT54G units could be battery operated from
>a vehicle, and with 3rd party firmware act as a repeater. That means
>the laptop itself need only be within range of the WRT54G, which can
>have a high gain external antenna.


This might also be helpful. I stuck an adjustable power supply on my
WRT54Gv1.1 and took some measurments.

Volts Amps Watts (receive)
20.0 0.26 5.2
15.0 0.35 5.4
12.0 0.45 5.4
10.0 0.56 5.6
8.0 0.70 5.6
7.0 0.80 5.6
6.0 0.95 5.7
5.0 1.2 6.0

I wasn't able to go below 5.0VDC because the stupid power supply
current limited at 1.2A. Also, the numbers are for receive. I was
too lazy to do transmit. My guess(tm) is to add about 10-15% current
drain for tx.


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Jeff Liebermann (E-Mail Removed)
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 AE6KS 831-336-2558
 
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Floyd L. Davidson
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      02-03-2005, 06:09 AM
Jeff Liebermann <(E-Mail Removed)> wrote:
>On Tue, 01 Feb 2005 23:22:03 -0900, (E-Mail Removed) (Floyd L.
>Davidson) wrote:
>
>>That answered every question that I had. ...


About an hour after I posted that I realized that I didn't
really know what kind of current it was drawing, and that you
would no doubt be in a position to figure out exactly. But... I
figured that the power supply that comes with it is probably
rated somewhere between 1.5 and 2 times the actual power, which
is close enough for government work...

>This might also be helpful. I stuck an adjustable power supply on my
>WRT54Gv1.1 and took some measurments.
>
> Volts Amps Watts (receive)
> 20.0 0.26 5.2
> 15.0 0.35 5.4
> 12.0 0.45 5.4
> 10.0 0.56 5.6
> 8.0 0.70 5.6
> 7.0 0.80 5.6
> 6.0 0.95 5.7
> 5.0 1.2 6.0


But, this *is* really useful information. I was over
estimating, as they come (or mine did) with a 12v 1A supply, so
it is rated at 12W, or slightly more conservative than the 2x
range I assumed.

>I wasn't able to go below 5.0VDC because the stupid power supply
>current limited at 1.2A. Also, the numbers are for receive. I was
>too lazy to do transmit. My guess(tm) is to add about 10-15% current
>drain for tx.


With a maximum output of 1/4 watt, it can't be much.

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Floyd L. Davidson <http://web.newsguy.com/floyd_davidson>
Ukpeagvik (Barrow, Alaska) (E-Mail Removed)
 
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Lucas Tam
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      02-03-2005, 06:39 AM
nospam <(E-Mail Removed)> wrote in news:020220050921209261%
(E-Mail Removed)lid:

> satori and its follow on, alchemy, add a *lot* of features and they are
> somewhat buggy. also, many people are not happy with how sveasoft
> conducts business.


How does Sveasoft conduct business? Is there something wrong with their
business model? I haven't seen any complaints (if any).

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Neon John
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      02-03-2005, 06:42 AM
On Wed, 02 Feb 2005 09:21:20 -0800, nospam <(E-Mail Removed)> wrote:


>satori and its follow on, alchemy, add a *lot* of features and they are
>somewhat buggy. also, many people are not happy with how sveasoft
>conducts business.


What is supposed to be wrong with the way they conduct business? Their
web site looks fairly straightforward to me. Open source firmware with a
quite reasonable $20/yr support contract. Is their support supposed to be
bad or something? I'm seriously interested, as I'm about to go with that
program to get some of the features they offer.

John
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