10.5.8 MBP cannot find or reliably connect to AirPort Express on channel 13

Problems with channel id 13:
============================
I believe this is another (NEW!) issue unrelated to the already described WLAN-battery-performance-drop-down. Furthermore the following may not only apply to 10.5.8 but to 10.5.7, too:
Since there are many (~20) WLAN networks in my neighborhood, I decided to switch to channel 13 (in the AirPort Utility for my Airport Express b/g) in order to minimize interference. This used to work fine.
But since 10.5.8 my intel MacBookPro 15" (Early 2006) does not find my WLAN anymore. It is not listed in the available WLAN-list. When switching Airport off on my MBP and on again, it sometimes finds my WLAN but the connection drops within a minute and I am completely disconnected - too short to get AirPort Utility to connect the Airport Express station (but it can find the Airport Express station for a second or so).
However, the iPhone3G and the ubuntu-linux still work great with the very same WLAN.
I tried another WLAN-router (d-link) and this plays well with my 10.5.8 MacBookPro.
Interestingly, when I tell the d-link WLAN to use channel 13, my Mac shows the same symptoms as with my AirPort Express b/g on channel 13.
I have not tested with which other channels this occurs.
The "hack" to restore the 10.5.7 IO80211Family.kext did not work. I reinstalled the 10.5.8 combo-update, but that does not help, either.
Note1: In Germany, WIFI channels 1 to 13 are allowed. Maybe, in the USA this is different and Apple did not tested the 10.5.8 Airport with the channels possibly not available in the states?
Note2: My MacBookPro is too old to apply the 10.5.8 Airport-slow-on-battery thingy patch, posted here in the forums.
Note3: Since 10.5.7 (or maybe a version below?) OS X (after sleeping or restarting) tells me that my preferred network has not been found. Then I disable and enable the airport and select my network once it appears. In the first place I thought this was due to the huge amount of WLANs... but now I am not sure any longer...
Perhaps others have observed a similar behavior?
Note4: I will post my specs (version of MBP and airport) later, since I am at work right now.
Note5: I will try to reset my Airport station to factory defaults and choose another channel.

Carolyn Samit wrote:
HI Samuel,
Definitely try a different channel.
Airport Troubleshooting Guide
Carolyn
Hey Carolyn thank's for your reply!
The Airport Troubleshooting Guide is great. Unfortunately did not help in my case.
(I tried a lot of other things, too. Installing the combo update 10.5.8, resetting PRAM, deleting keychain entries, removing Aiport adapter in the list of network adaptors, removing known networks and so one. Nothing did a change!)
What did help indeed was to plug in the Mac by ethernet cable and configure the Airport Express base station to a different channel. Then it works like charm (again), as you suggested, too.
I tested with another (d-link) wlan (b/g) station and confirmed my first suspicion that it has something to do with the channel and not with the base station or some configuration.
Both, channel 12 and 13 are NOT working, but all others do fine!
This is a bug (introduced in 10.5.8 or maybe 10.5.7, I am not sure?). I repeat, this is a bug and unrelated to the wifi battery issues described by others. I guess I will file a feedback report.
As a work-around, switch to another channel. I am not sure what happens to people who have channel left to "automatic" and the base station changes to 12 or 13 by itself. (Is this technically possible?) I think they will get problems. Definetely.
For completeness, my specs:
Model Name: MacBook Pro 15"
Model Identifier: MacBookPro1,1
Processor Name: Intel Core Duo
Processor Speed: 2 GHz
Number Of Processors: 1
Total Number Of Cores: 2
L2 Cache: 2 MB
Memory: 2 GB
Bus Speed: 667 MHz
Boot ROM Version: MBP11.0055.B08
SMC Version (system): 1.2f10
AirPort Card Information:
Wireless Card Type: AirPort Extreme (0x168C, 0x86)
Wireless Card Locale: Worldwide
Wireless Card Firmware Version: 1.4.16.2
Current Wireless Network: Apple Airport Express
Wireless Channel: 1

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I couldn't find my situation fully addressed in older posts, so I'm posting one myself.
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B: Why won't AirPort utility find my AirPort Express?
C: Why, on the two occasions the AP Utility did find the APE, did it not give me the option anywhere to set it up as an EXTENDER to the current network?
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I have a wireless network using Netgear WGR614 with WPA security settings. The AE has V6.3 firmware update and I used the Airport Admin 4.2 to set it up. I tried all the recommendations here and connected the AE to the router LAN port using ethernet cable and did a factory default reset. I then configured it to join my existing wireless network providing the WPA details.
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Thanks for the response. Here is an update:
I tried to connect to the AE from another windows laptop...and it worked. So it seems that it is only my laptop that cannot connect to the AE. The only difference is that I used my laptop to initially connect to the network created by the AE, and after that I could never get it to connect.
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Jan 1 00:00:00 5 Configuration updated.
Jan 1 00:00:01 5 Initialized (firmware 6.3).
Jan 1 00:00:15 5 Joined BSS 00:09:5b:fb:7c:7a
Jan 1 00:00:16 5 Installed unicast TKIP key for authenticator 00:09:5b:fb:7c:7a
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Jan 1 01:14:29 5 Disassociated with station 00:09:5b:fb:7c:7a (message integrity error).
Jan 1 01:14:38 5 Disconnected from network.
Jan 1 01:15:31 5 Joined BSS 00:09:5b:fb:7c:7a
Jan 1 01:15:31 5 Installed unicast TKIP key for authenticator 00:09:5b:fb:7c:7a
Jan 1 01:16:14 5 Internet configuration leased (host 192.168.0.3/24 gateway 192.168.0.1 dns1 192.168.0.1 domain innomedia.com lease 7776000).
Jan 1 01:27:18 5 Connection accepted from ::ffff:192.168.0.6/1153.
Jan 1 01:27:24 5 Connection accepted from ::ffff:192.168.0.6/1154.
Jan 1 02:35:43 5 Deauthenticated with station 00:09:5b:fb:7c:7a (leaving network).
Jan 1 02:35:43 5 Disconnected from network.
Jan 1 02:35:49 5 Disassociated with station 00:09:5b:fb:7c:7a (message integrity error).
Jan 1 02:35:49 5 Joined BSS 00:00:00:00:00:00
Jan 1 02:35:51 5 Deauthenticated with station 00:09:5b:fb:7c:7a (4-way timeout).
Jan 1 02:35:51 5 Disconnected from network.
Jan 1 02:35:59 5 Disconnected from network.
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Jan 1 02:36:53 5 Installed unicast TKIP key for authenticator 00:09:5b:fb:7c:7a
Jan 1 02:37:07 5 Internet configuration leased (host 192.168.0.3/24 gateway 192.168.0.1 dns1 192.168.0.1 domain innomedia.com lease 7776000).
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Okay, I have tried everything in this forum that I could find. But still, I cannot connect to my Airport.
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Any thoughts?
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Fixed! You jut need a girlfriend with a lot of determination....not even sure she knows how she did it. Involved a lot of menus and a lot of swearing.
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