[MLB-WIRELESS] Source of info online for microwave design (es p. antennas) - Guarded secret?

[graham]

Ben

With some antennaes that I have built at V/UHF the bottom of the T that you
describe is a matching stub, usually used when the dipole is a folded one,
or if you are using a 5/8 wavelength radiating element(s). Can't promise
that this is the answer but why don't you mesure the lengths of the "Telecom
logo" and see if you are dealing with a similar setup.

Graham

-----Original Message-----
From: Ben Ryan [mailto:ben at bssc.edu.au]
Sent: Sunday, 30 December 2001 3:03 PM
To: melbwireless at melbwireless.dyndns.org
Subject: [MLB-WIRELESS] Source of info online for microwave design (esp.
antennas) - Guarded secret?


Can't seem to find any good sources of info on the theory behind microwave
design - I am doing some stupid things with the local wireless broadband
gear to
convert them to 2.4g (just by swapping the LNB for a modified version -
don't
ask). It looks like things get strange at these freq's:

I pulled apart a 18dB parabolic and a 26(28?)dB para from Pacific Satellite,
and
their element is just plain weird.
It has two brass dipole elements (shaped like the old Telecom logo), but
they're
both soldered to the braid and the centre conductor is then connected to one
of
them at the top of the T.

Obviously I don't understand why this works, and I probably need to know
before
I get all my mates worked up about putting up a wlan mesh here in Bendigo
(Anyone here from Bendigo??? We got three nodes so far..:))

Could someone point me towards somewhere I can dig into to find out how the
2.4
EM behaves? Heavy tech is no probs. Just 144mhz+ is new ground ATM :)


cheers, and remember, ziggy hates you and your wlan :)


ben


________.-~-.________
Ben Ryan
Network Engineer
Lansys Technologies
Bendigo, Victoria 
Australia
Phone +61-[0]417 502061
email: ben at bssc.edu.au
URL: http://thrasher.impulse.net.au/index.htm


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