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Möte AMATEUR_RADIO, 1039 texter
 lista första sista föregående nästa
Text 884, 55 rader
Skriven 2007-11-20 16:51:00 av Holger Granholm (2:20/228)
     Kommentar till en text av Mark Lewis
Ärende: Re: yagi cantenna buildin
=================================
In a message dated 11-19-07, mark lewis said to Holger Granholm:

Hi Mark,

 HG> To me a cantenna is a can into which a probe looks. The probe is a
 HG> quarter of a wavelength and spaced about the same from the bottom
 HG> of the can. The bottom then acts as a reflector. Usually it is as a
 HG> feeder to a parabolic reflector.

ml>very interesting... it is very similar except that you turn it
ml>around and leave off the parabolic... in fact, it is very funny that
ml>you mention the parabolic because i was just thinking, yesterday,
ml>about turning the thing around and bouncing the signal off a
ml>parabolic! ;)

I use a dipole with reflector with my 2 feet parabolic reflector on
10 GHz amateur radio. The reflector is actually a flat screen behind
the dipole. Of course the feed antenna is directed towards the parabolic

ml>some folk seem to be calling this a yagi-uda but with the driven
ml>element in it, it looks like a waveguide design except that
ml>waveguides don't use the directors and boom like yagis... i suppose
ml>it is both, maybe? 

A yagi or yagi-uda (same thing) antenna is an antenna with a dipole a
reflector and any number of directors.

ml>some folk have built these using large beef stew cans and even
ml>coffee cans... i've also seen designs (from australia) where they
ml>just use a 1.something liter water bottle and wrap metal screen
ml>around it with some more screen on the back to act as a reflector
ml>for the N connector mounted driven element...

If you do have a library near you you could check if they do have a
book named "International Microwave Handbook". There is a lot of info
on microwave antennas (and other stuff). The book is published by the
ARRL (American Radio Relay League) and RSGB (Radio Society of Great
Britain). IIRC there is descriptions of 2.3 GHz antennas on p. 291.

 HG> Never heard or read about a yagi antenna in a can but I may have
 HG> missed something!

ml>take a look at the above URLs ;)

Not very much for surfing with this 486DX2-80MHz with 16 Mb RAM <BG>.

Have a nice day,

Holger

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