Kent,

        I would be interested in this ready made 433 Yagi (and a 418 also).
Do you have any contact info for COM West, or even better for the one in PA
since I am in the states already?

Shawn

-----Original Message-----
From: Kent Johansen [mailto:spam@ANAKRON.DK]
Sent: Monday, March 26, 2001 12:59 AM
To: PICLIST@MITVMA.MIT.EDU
Subject: Re: [EE]: Re: [AR] antenna question


Gentlemen,

Why not buy a good antenna for 433 MHz ?
I have recently purchased a number of Yagi's from COM West in
Vancouver. He imports them from the USA - I think Pennsylvania.
They are less than USD 100 ea. and has a gain of 11-12 dB

I set up two in the Guadalahara desert. They send about 2 miles
over a 25 meter hill, bouncing off a windmill. The signal at the
receiver is so strong, I can not squelch it out with my test receiver.
(10mW)

One note of caution: beware of the stand wave ratio. (SWR). A
quarter of a wavelength is 17 cm. The antenna cable should be an
odd number of quarter wavelengths, corrected for the cable factor.
It is very hard to measure SWR on 433MHz (If you don't have a
Bird Wattmeter). The best way is to guess and correct. But a
wrong SWR will be able to completely eat your signal.

Also, use good cables. 10mW disappears quickly. If you need 10
meters of cable, you will want a dimension that is almost thicker
than the transmitter itself.

Good luck.

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