Old Symbol AP antennas...

Old Symbol AP antennas...

Postby DaClyde » Tue Sep 03, 2002 6:12 pm

I've got a couple of Symbol antennas lying about, and was wondering if anyone could render and opinion on them:

http://www.symbol.com/products/wireless/omnidirectional.html#rddipole

This one offers a whopping 1dBi gain. Would this one give me any noticable difference?

http://www.symbol.com/products/wireless/omnidirectional.html#plane

0dBi gain....would that really be any better than the Avaya silver card I'm using by itself?

All I need are the two connectors on either end of a wire to hook these up to the card. With the 2nd one, I'm thinking more of just being able to get the antenna outside the car while driving, and that that alone might help.

I'm finding it curious that all of Symbol's omni-directional antennae deliver some absolutely pitiful gains when compaired to the $10-$15 homebrew stuff.
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Postby Entropy42 » Sat Sep 07, 2002 10:19 am

Easy explanation for the crappy gains (at least for some of them)

They're taking into account coax cable losses.

Still, even with 20 feet of cable, the specs on that 27-inch antenna seem very low. Even the worst cables I've seen are on the order of maybe 12-15 dB/100 feet, given their specs, they seem to be claiming losses of 28 dB or so/100 feet in the cables to their antenna.

(Look at the specs for the antenna that comes with either 20' or 30' cables - 10 feet difference is a difference of 2.8 dB - That's a LOT for a 10-foot cable...)
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What's the point of all that antenna cable?

Postby DaClyde » Sat Sep 07, 2002 12:58 pm

In the Symbol installation I have experience with, there's not a single antenna that's more than 3 feet from it's access point, yet the installers brought about 5000' of cable with them. Maybe they just have some insane distance over-estimation built into their specs.
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Postby Firebird » Sat Sep 07, 2002 6:22 pm

Ugh symbol antennas sicken me and their price is even more outrageous!
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