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/