amdx wrote:
alt.binaires.schematics.electronic
for a picture of my concept.
Looking to combine Helical antenna and Wifi adapter card in one unit.
My experience is limited to MW bcb. I know there are many pitfalls at
2.4Ghz, so I'm looking for feedback on how to do this properly.
I'm using the following page as my guide.
http://www.wlan.org.uk/jhecker.html

Note that in almost all places there are legal limitations on EIRP
(Effective Incident Radiated Power). In plain English, the more
you narrow a signal, the stronger it becomes.

Since you did not say where you are, I'll mention the two places I
know for sure. In the U.S. WiFi EIRP is limited to 1 watt for
mobile/portable use (e.g. laptops) and 4 watts for fixed links.

With a 100mW source and a reasonablyshort cable the famous Pringles can
antenna would be illegal for mobile/portable use and probably illegal
for fixed links. It happened to be developed by an FBI agent in the
process of an investigation, so he was covered, you may not be.

Here in Israel it is limited to 100mw EIRP, so unless you have
a very long cable, any gain antenna would be illegal. Someone wrote
up (in Hebrew) and posted on a web site his use of a similar
antenna. It's not obvious to the casual reader that he did it
in an area under the jursidiction of the IDF (Israeli Army) and
got permission from them.

Geoff.

--
Geoffrey S. Mendelson, Jerusalem, Israel N3OWJ/4X1GM
IL Voice: (07)-7424-1667 U.S. Voice: 1-215-821-1838
Visit my 'blog at http://geoffstechno.livejournal.com/

Note that in almost all places there are legal limitations on EIRP
(Effective Incident Radiated Power). In plain English, the more
you narrow a signal, the stronger it becomes.

Since you did not say where you are, I'll mention the two places I
know for sure. In the U.S. WiFi EIRP is limited to 1 watt for
mobile/portable use (e.g. laptops) and 4 watts for fixed links.

Bear in mind that 2.4GHz is also an amateur band where no erp limits exist!!

Jeff

On Wed, 25 Jul 2007 18:12:26 +0100, Jeff wrote:

Note that in almost all places there are legal limitations on EIRP
(Effective Incident Radiated Power). In plain English, the more
you narrow a signal, the stronger it becomes.

Since you did not say where you are, I'll mention the two places I
know for sure. In the U.S. WiFi EIRP is limited to 1 watt for
mobile/portable use (e.g. laptops) and 4 watts for fixed links.

Bear in mind that 2.4GHz is also an amateur band where no erp limits exist!!

Oh , really ?! cite!

That may be true but to use it that way legally you would need an
amateur license, and this is not just a paperwork exercise, you have to
pass FCC exams covering electronics and radio theory (plus laws and
regulations) to get one. For most people, it's not an option.

Allodoxaphobia wrote:
On Wed, 25 Jul 2007 18:12:26 +0100, Jeff wrote:
Note that in almost all places there are legal limitations on EIRP
(Effective Incident Radiated Power). In plain English, the more
you narrow a signal, the stronger it becomes.

Since you did not say where you are, I'll mention the two places I
know for sure. In the U.S. WiFi EIRP is limited to 1 watt for
mobile/portable use (e.g. laptops) and 4 watts for fixed links.
Bear in mind that 2.4GHz is also an amateur band where no erp limits exist!!

Oh , really ?! cite!

"Barry Watzman" wrote in message
...
That may be true but to use it that way legally you would need an amateur
license, and this is not just a paperwork exercise, you have to pass FCC
exams covering electronics and radio theory (plus laws and regulations) to
get one. For most people, it's not an option.

Very few people would have significnat difficulty passing the technician class
license exam that's needed to operate on 2.4GHz. Indeed, there are many
month-long (meet a couple times a week) classes and even weekend "cram"
classes that have near 100% success rates in getting people their tickets. A
passing score is 80%!

On Wed, 25 Jul 2007 12:09:30 -0700, Joel Kolstad wrote:
"Barry Watzman" wrote:
That may be true but to use it that way legally you would need an amateur
license, and this is not just a paperwork exercise, you have to pass FCC
exams covering electronics and radio theory (plus laws and regulations) to
get one. For most people, it's not an option.

Very few people would have significnat difficulty passing the technician class
license exam that's needed to operate on 2.4GHz. Indeed, there are many
month-long (meet a couple times a week) classes and even weekend "cram"
classes that have near 100% success rates in getting people their tickets. A
passing score is 80%!

But, I suppose that believing, as did an earlier poster:
"Bear in mind that 2.4GHz is also an amateur band where no erp limits exist!!"
is acceptable for these No-Code, No-Klew Licensees?

"Allodoxaphobia" wrote in message
...
But, I suppose that believing, as did an earlier poster:
"Bear in mind that 2.4GHz is also an amateur band where no erp limits
exist!!"
is acceptable for these No-Code, No-Klew Licensees?

That's what you get when at least the ARRL seems to be primarily interested in
keeping the number of amateurs high even as society in general seems to be
less and less willing to work a little for a bit of knowledge.

Significant power is still hard enough to come by at 2.4GHz that most of them
will probably run out of interest or money before doing *too* much damage. :-)
That being said, it's not like you need that much power to go impressive
distances anyway; see: http://www.wifiworldrecord.com/ .

---Joel

Barry Watzman wrote in news:46a7981e$0$30632
:

That may be true but to use it that way legally you would need an
amateur license, and this is not just a paperwork exercise, you have to
pass FCC exams covering electronics and radio theory (plus laws and
regulations) to get one. For most people, it's not an option.


And when you do get that license, you are, by lay, limited on what you can
communicate.

IMO. boosting your home wi-fi unser the auspices of an Amateur Radio
License is a no-no.

"Gary Tait" wrote in message
...
And when you do get that license, you are, by lay, limited on what you can
communicate.

Well, the main one is (paraphrased) that you can't be using the amateur bands
for making money on a regular basis... although on-the-air swap meets,
ordering pizza at Pizza Hut via the Internet, books through Amazon, etc. is
certainly all kosher. Were there other exceptions you were thinking of?

IMO. boosting your home wi-fi unser the auspices of an Amateur Radio
License is a no-no.

As long as you don't use encryption and aren't running your business through
it, in my opinion it's a perfectly reasaonble use. Heck, even QST has
articles on doing so.

Joel Kolstad wrote:
"Gary Tait" wrote in message
...

And when you do get that license, you are, by lay, limited on what you can
communicate.


Well, the main one is (paraphrased) that you can't be using the amateur bands
for making money on a regular basis... although on-the-air swap meets,
ordering pizza at Pizza Hut via the Internet, books through Amazon, etc. is
certainly all kosher. Were there other exceptions you were thinking of?


IMO. boosting your home wi-fi unser the auspices of an Amateur Radio
License is a no-no.


As long as you don't use encryption and aren't running your business through
it, in my opinion it's a perfectly reasaonble use. Heck, even QST has
articles on doing so.


Indeed? Which issue? I recall some articles about HSMM and building a
slotted array with gain, but not wholesale use for extension of your
internet connection.


I think that if you start to stray too far from incidental commercial
use, you could get into trouble, especially if lots folks start doing
it. The classic pizza over the autopatch is the example, and I suppose
the occasional ordering from Amazon fits in the same category. But, if
were to, for instance, check your work email, or watch pay-per-view
content, you might be pushing it. In particular, if you but a PA on
your access point and a directional antenna, so that your neighbor can
use it too, you're likely to be stepping over the line.

It's all a judgement call, but the intent is that amateur radio not be
used where there is a commercial service that can provide the same
functions. This is so the commercial entities can't claim that someone
using amateur frequencies is getting an unfair competitive advantage
(among other reasons)