Strange Airport problem. Any idea?

Hello to everyone.
I got a little problem with wirless connection on a Macbook (2Ghz Core
2 duo and Leopard 10.5.1): this Mac it seems to see just 2 wireless
networks while 2 other macs can see 4 networks. Obviously my network
is one of those he can't see
I tried using both an Airport Extreme or Express network (i bought
both) but had no success. I have to say that one day for a few hours
he joined my network successfully but lost the signal without any
reason in a few minutes and never saw it again.
I tried to remove anypassword but the problem here is that he simply
can't find the network on his list. But i swear, the network works
good and the problem is on the mac side.

Just to clarify, i have no problem to join those Apple networks with
an older Macbook (Core duo with Leopard 10.5.1) or with a Powerbook
(Panther). Never had a problem with them.

The first Mac, the one that can't join my apple networks, as i wrote
can always see 2 other networks (but i can't try to join them as they
are protected).
I thought that maybe there's an hardware issue here, with a wireless
card that is not properly working.
Do you agree?

In article
<b3ee8f77-c881-4f9b-b2fe-1d3cb5e7aaf3.TakeThisOut@d27g2000prf.googlegroups.com>,
Simone <vitopod3.TakeThisOut@gmail.com> wrote:

> Hello to everyone.
> I got a little problem with wirless connection on a Macbook (2Ghz Core
> 2 duo and Leopard 10.5.1): this Mac it seems to see just 2 wireless
> networks while 2 other macs can see 4 networks. Obviously my network
> is one of those he can't see
> I tried using both an Airport Extreme or Express network (i bought
> both) but had no success. I have to say that one day for a few hours
> he joined my network successfully but lost the signal without any
> reason in a few minutes and never saw it again.
> I tried to remove anypassword but the problem here is that he simply
> can't find the network on his list. But i swear, the network works
> good and the problem is on the mac side.
>
> Just to clarify, i have no problem to join those Apple networks with
> an older Macbook (Core duo with Leopard 10.5.1) or with a Powerbook
> (Panther). Never had a problem with them.
>
> The first Mac, the one that can't join my apple networks, as i wrote
> can always see 2 other networks (but i can't try to join them as they
> are protected).
> I thought that maybe there's an hardware issue here, with a wireless
> card that is not properly working.
> Do you agree?

Perhaps.

You don't say if he was moving around at all when he found then lost the
signal. A few inches can be all it takes to move into a "dead zone".

You make no mention of the remote system's position and/or line of sight
to the base. This can be critical.

Obstacles (walls, trees, the furnace or washing machine in the hall
closet between the base and the remote system, even human or pet bodies)
can also cause problems. Aluminum siding on the house, or foil-backed
insulation in the walls can almost completely kill reception. While is
isn't "usual", even a wire or piece of plumbing in the wall between the
base and the remote machine CAN, and sometimes DOES make a "dead spot"
at the remote machine's location.

And of course, distance is a factor - Is the remote machine in the same
house? Across the street? Somewhere else?

As you can see, there are several possibilities that don't include "bad
card", and until you eliminate them, you might go through several new
(and perfectly good) wireless cards and still have the same trouble.

Another thing to look at is what channels the various networks are on -
They can interfere with each other in various ways.

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