dear olpc devel people,
i've been doing some research and found a couple of companies with SDR
R.F. front-end ICs. one is 40nm and is so tiny that it will only cost
about $2, mass-produced. also thanks to being in 40nm, the speed of
the (SoC / embedded) ARM9 core is so fast that it's perfectly
even this could be implemented. http://en.wikipedia.org/wiki/IEEE_802.22
_especially_ 802.22 which is a perfect candidate for SDR because of the
need to cooperate, and not interfere with the existing TV transmissions.
anything - absolutely, absolutely anything. with SDR, you get
_proper_ freedom
this does not directly involve OLPC, but since I know folks here have had
to deal with the problem I'm asking for help here.
I'm setting up wireless for a confrence in the near future (~1000 people
for 3 days in a hotel), I know the RF side of things well and will be
doing my best to avoid
Can anyone help me with a tiny Forth script? Can never quite get my
head around the language.
I'm trying to set up an if-else based on whether a mfg tag exists (or
whether writing a mfg tag succeeded or not)
I'm trying:
add-tag ak 0 catch if 2drop . Laptop already activated cr then
But, if
Luke,
Looks like you have the incorrect link for the Openbts.org.
The correct link is now http://openbts.sourceforge.net/
/Robert H.
rihowa...@gmail.com
linux - the best things in life are free
On Jan 25, 2010, at 7:42 AM, Luke Kenneth Casson Leighton wrote:
dear olpc devel people,
i've been doing some research and found a couple of companies with SDR
R.F. front-end ICs. one is 40nm and is so tiny that it will only cost
about $2, mass-produced. also thanks to being in 40nm, the speed of
vs
i repeat. all those can be replaced with _one_ i repeat _one_ single
On Mon, 25 Jan 2010, Luke Kenneth Casson Leighton wrote:
i've been doing some research and found a couple of companies with SDR
R.F. front-end ICs. one is 40nm and is so tiny that it will only cost
about $2, mass-produced. also thanks to being in 40nm, the speed of
the (SoC / embedded) ARM9
On Mon, 25 Jan 2010, NoiseEHC wrote:
i've been doing some research and found a couple of companies with SDR
R.F. front-end ICs. one is 40nm and is so tiny that it will only cost
about $2, mass-produced. also thanks to being in 40nm, the speed of
vs
i repeat. all those can be replaced
On Mon, Jan 25, 2010 at 10:59, Daniel Drake d...@laptop.org wrote:
Can anyone help me with a tiny Forth script? Can never quite get my
head around the language.
I once wrote pen plotter programs in FORTH for fractals, to test the
plotter mechanism. Hypnotic.
I'm trying to set up an if-else
daniel wrote:
Can anyone help me with a tiny Forth script? Can never quite get my
head around the language.
I'm trying to set up an if-else based on whether a mfg tag exists (or
whether writing a mfg tag succeeded or not)
I'm trying:
add-tag ak 0 catch if 2drop . Laptop
On 01/25/2010 12:05 PM, Paul Fox wrote:
maybe something like:
ak find-tag if 2drop . Laptop already activated cr then
i'm pretty much a neophyte too, but i believe the commands that one
types at the ok prompt that feel like command, with trailing args,
should be avoided when
On Mon, Jan 25, 2010 at 4:24 PM, da...@lang.hm wrote:
On Mon, 25 Jan 2010, Luke Kenneth Casson Leighton wrote:
i've been doing some research and found a couple of companies with SDR
R.F. front-end ICs. one is 40nm and is so tiny that it will only cost
about $2, mass-produced. also thanks
On Mon, Jan 25, 2010 at 6:05 PM, Luke Kenneth Casson Leighton
l...@lkcl.net wrote:
the key questions to be asking are: in light of the massive volumes
involved with OLPC XOs, is SDR worth pursuing, given all the
development costs, but given all the benefits especially where SDR can
be
On Mon, Jan 25, 2010 at 4:25 PM, da...@lang.hm wrote:
On Mon, 25 Jan 2010, NoiseEHC wrote:
i've been doing some research and found a couple of companies with SDR
R.F. front-end ICs. one is 40nm and is so tiny that it will only cost
about $2, mass-produced. also thanks to being in 40nm, the
On Mon, 25 Jan 2010, Luke Kenneth Casson Leighton wrote:
On Mon, Jan 25, 2010 at 4:24 PM, da...@lang.hm wrote:
On Mon, 25 Jan 2010, Luke Kenneth Casson Leighton wrote:
i've been doing some research and found a couple of companies with SDR
R.F. front-end ICs. one is 40nm and is so tiny that
On Mon, 25 Jan 2010, Luke Kenneth Casson Leighton wrote:
On Mon, Jan 25, 2010 at 6:05 PM, Luke Kenneth Casson Leighton
l...@lkcl.net wrote:
the key questions to be asking are: in light of the massive volumes
involved with OLPC XOs, is SDR worth pursuing, given all the
development costs,
On Mon, Jan 25, 2010 at 4:24 PM, da...@lang.hm wrote:
imagine (and would you really want a device that could be wifi, OR GPS
OR but not more than one at a time?)
http://www.limemicro.com/products.php
you can see, from the evaluation board, that there are _fourteen_
separate R.F. coax
On Mon, 25 Jan 2010, Luke Kenneth Casson Leighton wrote:
On Mon, Jan 25, 2010 at 4:24 PM, da...@lang.hm wrote:
imagine (and would you really want a device that could be wifi, OR GPS
OR but not more than one at a time?)
http://www.limemicro.com/products.php
you can see, from the
2010/1/25 da...@lang.hm:
but my question is if there is a limit (other than the effective limit of
the RF channel) on the number of systems that can assocciate with a single
access point?
Yes - APs often have a limit.
The limit is not defined by any kind of specification. It depends on the
On Mon, Jan 25, 2010 at 6:52 PM, da...@lang.hm wrote:
http://www.limemicro.com/products.php
you can see, from the evaluation board, that there are _fourteen_
separate R.F. coax connectors, and that the product description says
listen for GSM stuff as well as transmit. also it's 375mhz to
Hi,
Yes - APs often have a limit. The limit is not defined by any
kind of specification. It depends on the AP.
I think I recall that brief testing with a bunch of consumer access
points at OLPC showed that this number was usually above 15 clients
and below 30 clients, per AP, at 54Mbps.
On Mon, Jan 25, 2010 at 6:35 PM, da...@lang.hm wrote:
[...] projects. I'll bet that these chips can operate in that band, but not
throughout the band without changing external components.
certainly mirics 80mhz-5ghz receiver chip has multiple RF inputs and
has i think it looks like it has 3
On Mon, Jan 25, 2010 at 6:33 PM, da...@lang.hm wrote:
the key questions to be asking are: in light of the massive volumes
involved with OLPC XOs, is SDR worth pursuing, given all the
development costs, but given all the benefits especially where SDR can
be re-programmed to do whatever in
2010/1/25 Richard A. Smith rich...@laptop.org:
I worked it out.
: check-ak add-tag ak 0 eval ;
ok ' check-ak catch if . Laptop already activated cr then
Thanks muchly!
It works well.
Daniel
___
Devel mailing list
Devel@lists.laptop.org
Hi,
What seems to be a lesser-common problem in the other deployments I
have seen seems to be quite common here: chargers are breaking due to
damage to the cable and the point where the cable enters the big green
plug that goes into the power socket.
Although these problems seem to be due to
Chris and Daniel are right. Doing this with SOHO APs is going
to be difficult - it would require over 25 APs.
You have moved into a area where you are probably better off
using high-priced (i.e. multiple antenna) APs, and a centralized
controller.
wad
On Jan 25, 2010, at 11:57 PM,
Sorry for the delayed response, I think I need to play around and compile a
kernel module and then use it on the xo-1. But to answer a few of the
questions...
The init of the psmouse module
triggers a calibration.
that's certainly true, but i think it happens pretty early -- the
kernel is
james wrote:
Sorry for the delayed response, I think I need to play around and compile a
kernel module and then use it on the xo-1. But to answer a few of the
questions...
The init of the psmouse module
triggers a calibration.
that's certainly true, but i think it happens
On 01/25/2010 04:31 PM, Daniel Drake wrote:
Hi,
What seems to be a lesser-common problem in the other deployments I
have seen seems to be quite common here: chargers are breaking due to
damage to the cable and the point where the cable enters the big green
plug that goes into the power
On Mon, Jan 25, 2010 at 03:31:24PM -0600, Daniel Drake wrote:
chargers are breaking due to damage to the cable and (sic) the point
where the cable enters the big green plug that goes into the power
socket.
I agree with Richard, something has to fail, and the cable should be the
thing to fail
On 01/25/2010 09:27 PM, James Cameron wrote:
But my original reading of what you said suggests the failures are at
the AC end of the cable ... the power supply housing is a big green
plug and it goes into the wall power socket.
Which is it?
I'll add that we have one other report from Nepal
On Mon, 25 Jan 2010, Luke Kenneth Casson Leighton wrote:
ok - i'm asking the wrong question :)
let's assume that somewhere in 2010 an SDR modem exists (from
someone, doesn't matter who made it). let's assume that software is
available (COTS) and is (perhaps temporarily, perhaps permanently)
On Jan 26, 2010, at 2:07 AM, Luke Kenneth Casson Leighton wrote:
On Mon, Jan 25, 2010 at 6:05 PM, Luke Kenneth Casson Leighton
l...@lkcl.net wrote:
the key questions to be asking are: in light of the massive volumes
involved with OLPC XOs, is SDR worth pursuing, given all the
development
On Mon, 25 Jan 2010, Chris Ball wrote:
Hi,
Yes - APs often have a limit. The limit is not defined by any
kind of specification. It depends on the AP.
I think I recall that brief testing with a bunch of consumer access
points at OLPC showed that this number was usually above 15
On Jan 26, 2010, at 4:58 AM, Luke Kenneth Casson Leighton wrote:
On Mon, Jan 25, 2010 at 6:33 PM, da...@lang.hm wrote:
the key questions to be asking are: in light of the massive volumes
involved with OLPC XOs, is SDR worth pursuing, given all the
development costs, but given all the
On Mon, Jan 25, 2010 at 10:31 PM, da...@lang.hm wrote:
I've read through these, and they have a lot of useful info. I do have
good RF experiance (and even some halfway decent tools for looking at
things), but I didn't know what, if any limits there were on the number of
clients other than
On 07.12.2009, at 12:54, Dave Bauer dave.ba...@gmail.com wrote:
On Sun, Dec 6, 2009 at 7:22 PM, Gerald Ardito
gerald.ard...@gmail.com wrote:
Tomeu,
There is no mime type that I can see. The Journal entry simply says
File filename.pr from url for file.
This is no different, by the way,
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