Re: Signal strength meter for 802.11 wireless?
From: Mike (mike_at_nospam.com)
Date: 06/06/04
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Date: Sun, 6 Jun 2004 08:39:04 -0700
On Sat, 5 Jun 2004 23:18:34 -0700, DaveC wrote:
> I'd like to have a signal strength meter to use when aiming high-gain
> antennas for use with 2.4 GHz wireless network signals. This is similar in
> function to the "satellite finder" tools that TV dish antenna installers use.
>
>
> This would be just a raw antenna; 802.11 doesn't use amps at the antenna,
> that I've ever seen.
>
> I'd like to make it as simple as possible, either with a meter element alone,
> or with an audible beat frequency to indicate maximum strength when aiming.
>
> Sure a laptop with "stumbler" software will work, but putting my laptop at
> risk (holding it in one hand while aiming with the other, on the roof, no
> less), and the lame daylight performance if most tft displays makes looking
> for an alternative very desirable.
>
> Circuit suggestions?
802.11 doesn't use amps at the antenna, but the antenna signal usually
doesn't have far to go before it runs into the amp, either.
I'm not familiar with satellite systems, but I think they operate in
exclusive narrow bands, don't they? If that's the case, then to locate a
satellite, all I have to do is move the receiver around until I detect a
signal.
On the other hand, I think the 2.4GHz band used by 802.11 is used by
various different services, all of which avoid stepping on each other by
use of various orthogonal (or mostly so) modulation schemes. The result is
that you need the full 802.11 receiver, which needs to acquire the signal
you're interested in before it can measure the signal strength.
-- Mike --
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