Airport Express (n) signal issues with Powerbook G4

Here is my setup:
1 Airport Express (n)
1 Cradlepoint CTR500 router
1 Lenovo PC Laptop
1 Powerbook G4 12"
I have a printer hooked up to the Airport Express as well as my stereo. I have the AX set to 802.11n (b/g compatible) for the Powerbook. My laptop (PC) is n. The Powerbook is approx 10 feet away from the AX, and there is a wall with a door between the two. No electronics are between in the wall, etc. Its a pretty strait shot, except for the wall.
I have noticed that the Powerbook will show 5 bars for Airport, and after a little bit, go down to 2 bars, or even 1. It will stay there, couple of mins at the most, then shoot back up. Sometimes I have to disconnect (turn airport off) and then reconnect to establish 5 bars.
Now, I have also noticed on my PC that (being 3 feet away from the AX) I will sometimes go from 5 bars to 4, and my laptop will register anywhere from 14 Mbps up to ~150 Mbps connection. It settles around 72 Mbps when the Powerbook is connected to the network. So why under normal web page browsing, does my speed drop to 14, 28, 36 Mbps, yet show signal strength at 4 bars, or even 5, usually when the Powerbook is connected? In addition, and I understand that the 54G rated Powerbook will slow the network down all around, why is it that the Powerbook will drop from 5 bars down to 2, or even 1 in the airport menu? Is the AX changing channels? I have manually set it to channel 8 to see if that was the problem, and it didn't seem to solve anything.
I am kind of at a loss here. Perhaps interference? I do live in an old 100+ year old house, so that might be an issue? I will say that when I set it to N 5GHz, my laptop will connect and maintain a 300 Mbps speed. That's pretty good IMHO. So since that stays connected properly, I can only assume that it is a 2.4 GHz interference issue with neighbors, upstairs phones (this is an apartment) or other devices perhaps.

I think you're probably right that you're getting intermittent interference at 2.4 GHz.
Suggest you try [iStumbler|http://istumbler.net]. Monitor it for a day or so to get an idea of which channels your neighbors may be using. Then, set the AX to one as different from the others as possible. If the interference problem returns, try another open channel.
Also, try activating interference robustness on the AX and Powerbook.

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Please locate the model number of the AirPort Express and post back that information.
The model number is located on the side of the AirPort Express. It begins with an "A" followed by four numbers.
We are not sure what you mean by "does not work". Does this mean that the AirPort Express worked at one time and has just recently stopped working?
Have you installed a newer operating system on your iOS device recently?
Or, is this a new AirPort Express that you are trying to configure for the first time?
If yes, what service will the AirPort Express perform on your network?
Please remember that we cannot see your network, so we only know as much about your problem as you can tell us.

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Serial Number: HS4430MTR4P
Model:
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Build Country:
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Build Year:
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Build Week
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Connect the Express to your modem, leave them connected, and do not disconnect them from one another without powering down the modem again.
Re-connect everything including power and let the devices complete their startup sequences. This usually takes a moment or two.
If that does not result in success, "hard reset" the Extreme or Express according to the instructions below and start over from the beginning.
If you still have trouble, contact AppleCare because you have done everything reasonable to get it to work.
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I need to connect everything as in the first case scenario, because two of the Airport Extreme units are quite far from the main Airport Extreme station (I bought a second Extreme station to extend the signal!).
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Not trying to insult you with basics, but there are a few things you can try with your scenario (which is probably one of the most advanced and therefore problem-prone setups). It may also be there are just some issues that Apple has to work out in future updates.
1. Factory reset on ALL 5 units.
2. Changing channels (use only 1, 6, or 11 - there are reasons why).
3. Try changing encryption levels to at least see if that seems to be an issue. I usually start with "None" to eliminate a bad link in the chain.
4. Power levels lowering one or both units may actually help in some situations.
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Hi,
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Consider it purged, John!
I got a survey which I filled in as constructively as possible (largely because I didn't want to get the second guy any grief because I feel he was as helpful as he was able to be.)
I finally sorted out the issue, with one final hiccup ("Join a network" was so branded on my brain from my attempts at THAT ACRONYM that I forgot I needed to use "Extend a network" instead – d'oh!)
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I agree with what you're saying about customer service. It's probably not an easy job - I don't think I was rude at any point (at least I hope not), though I may have sounded whiny and stressed, which would have been nothing personal, just frustration with the situation. But there are ways for helpline staff to say, "OK, let's go through this one step at a time…" without getting uppity!

Airport express - have signal, can't connect from other computers

i'm not the most computer savvy, so i apologize if i don't know all the terminology. i'll try to explain my problem as best i can...
i have airport express. i'm using it as a base station in my father's office and then attempting to connect wirelessly with my laptop and my brother's laptop. i know the internet itself works because my mother's computer, which connects via ethernet, has internet access. my dad's computer, which is, i guess, the airport administrator station, has internet. his wireless signal is, obviously, fine.
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my best guess is that there must be settings on my dad's computer that don't recognize the laptops trying to connect.
if anybody has any advice, it would be greatly appreciated. if you have any particular places on the apple support page that you think i should look at, just post the link. thanks in advance.
p.s. my dad's computer runs 10.4.5, my brother's laptop same, and my laptop 10.2.6, if that makes any difference.

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Both have been reset loaded and reloaded with the latest firmware as of 29/12/2013 to 11/1/2014.
My ISP is Virgin Media UK so I have their wifi router connected to my extreme (with a network cable) and the express is the wifi extender for the extreme.
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The situation I have is, my Airport Extreme is listed lists the Vendor as Apple and only has one signal output, as expected.
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Below is an example of what is going on, I have grey out my neighbours signals to show you my network. The locations of the devices are upstairs and downstairs, oddly the location of the second signal (Frequnecy 5500) coming out of the Airport Express is different to the first signal (Frequnecy 2407) of the Airport Express which I also find a little odd. (Across the road according to Google Maps) though not sure the accuracy of this information.
The picture below is just after I hard reset the device and downgraded then upgraded the firmware with 4 different firmware numbers from lowest to highest, which meade no difference to the dual signal.
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My questions are:-
1/ Is this normal?
2/ Would there be a reason why my Airport Express is now not listed as an Apple Device?
3/ Is there anything I can do to fix this if this is not normal?
4/ Any ides how this could have happened if this is not normal?
5/ Should I just take the Express into the genius dude (or dudette) to have the look at it?
Thank you in advance for any information you can throw my way.

Anyone?

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My ISP provider has provided me with the following info:
- IP address
- Subnet Mask
- Router Address/Gateway
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The only other thing I haven't tried is to supply my ISP provider with the MAC address of the Airport Express device. Does anyone know if this would work and, if so, would I be able to use my Airport Express as a wireless router?
Unfortunately, I can't switch ISP providers as this provider is the only one I can use in the area (so frustrating!!) so I have to try to work around the system. Please help!!
Note: my Airport Express is the new model (I bought it a few weeks ago) and I have tried connecting to it using Airport Utility version 6.3.2 with Mac OS X 10.9.4 and OS X 10.9.2

Welcome to Apple Support Communities
If your PC hasn't got a disc drive, download AirPort Utility from the Apple website to set up the AirPort Express > http://support.apple.com/kb/DL1547?viewlocale=es_ES

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