problems with Wired Equivalent Privacy (WEP)

[http://dummy.us.eu.org/robert (Robert)]

I am unable to get my WEP to work on my 720-AEX PCMCIA card.  I am able
to connect without WEP.  My access point is a LinkSys Etherfast Wireless
AP + Cable/DSL Router (BEFW11S4).  I visited the LinkSys web site and
they suggested that I set the passphrase to "77777".  Because I set it to
that, it suggested that I should be able to set the key to
37 - 37 - 37 - 37 - 37 and have it work.  It doesn't.

I did notice that setting WEP on the access point, but not on the PCMCIA card,
I can receive, but cannot transmit.  Conversely, if I set WEP on the PCMCIA
card but not on the access point, I can transmit, but not receive.

My configuration settings on the PCMCIA card are:

Network mode: Infrastructure
Encapsulation: None
Tx Rate: 11Mbit

The connected BSSID is correct -- it is the MAC address of my access point.

Any ideas on how to get the WEP working?

Thanks.