Sounds like you might be getting interference (Quality = Signal - Noise) and your actual quality drop as the noise increases. If you are lucky it may be a phone or another AP on the same channel and simply switching to channel 1 or 11 will help. If you are unlucky the interference is all over the band and you will need to track it down, work around it with more directional antennas, or live with it.

Cheers,
Cliff

On Apr 5, 2004, at 11:42 AM, DaveC wrote:

When I try to connect to a Wi-Fi AP in my area (signal strength about 70 -- per MacStumbler), sometimes it's valid (2 to 3 bars in the AirPort menu bar icon), and sometimes not (zero bars, and the "There was an error joining the AirPort network [whatever]." dialog when I try to connect).

I can at all times see the signal using MacStumbler. It is always relatively strong (60-plus), regardless the strength or validity shown in the AirPort menu bar icon. MacStumbler reports this data:
Channel: 6
Strength: 70-plus
Noise: 50 (average)
Type: Managed
WEP: No


When I am able to join the network (ie, when the AirPort menu confirms that this network signal is available), the signal strength can be confirmed via AP Grapher. (APG will only measure and display signal strength of a network you are able to connect to).

Here's the mystery: the signal will be valid (2 to 3 bars in the menu bar icon), then instantly become invalid (zero bars in AirPort icon). But according to MacStumbler, the AP is putting out the same signal, unchanged. Then all of a sudden -- hours later -- it is now accessible again.

Note that while AirPort menu and AP Grapher indicate the signal has gone to zero, MacStumbler shows it unchanged.

If it weren't for confirmation of the strength (70-plus) in MacStumbler, I'd think that this signal was too weak to connect to. It seems quite weird that it can come and go so quickly, yet remain so strong.

Ideas?

Thanks,
Dave
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