Belkin F5D7633 ADSL modem, router and highspeed wireless access point

Hi,

As my Netgear modem stopped working for the second time in 3 years I
decided to replace it. I choose the Belkin F5D7633 ADSL modem, router
and highspeed wireless access point, which is connected to a Netgear
FM114P router, printer server and wireless access point.

When connecting from my laptop using a Netgear MA 521 pcmia card and
performing my ISP's speed test I only get 550Kbps when connected to
the Belkin wireless access point, but 950Kbps when connecting to the
Netgear wireless access point

If I swap the Netgear MA 521 for a Netgear MA 401 then the speed is
the same (950Kbps) for both Belkin and Netgear wireless access point.

OS is XP and my ADSL line is rated at 1Mbps, which is why the speed
test 950Kbps. The change to swap from the Belkin to the Netgear
wireless access point is ot change the SSID; I am not using any
encryption.

Any suggestions as to what I can do to improve the speed of the MA521
when connected to the Belkin wirelessaccess point? I tried Belkin
support and couldn't offer any suggests.

Regards

nemo2