How can I select which channel the wireless card on the Macbook Pro uses?

Hi,
I have a MacBook Pro which must be 5-6 years old running OS ver10.5.8 with the following wireless card details..
  Wireless Card Type:          AirPort Extreme  (0x168C, 0x86)
  Wireless Card Locale:          Worldwide
  Wireless Card Firmware Version:          1.4.16.2
  Current Wireless Network:          ML MC
  Wireless Channel:          6
.. and a Time Capsule running firmware ver 7.6.1.
We recently installed a faster broadband connection and for some reason the pc’s (recent purchases) we have are regularly getting a 37Gb max download speed and the MacBook Pro is regularly getting only 19Gb max download speed.  All the computers are connecting through the same Time Capsule to the net.  On the Time Capsule the 2.4GHz and 5GHz bandwidths are set so the channel is selected automatically.
Is the max download speed on the MacBook pro slower because of the wireless card in it?  And if so, how can I check?  Could I manually adjust it to a faster setting?
Thanks,
Simon  

Channels are managed by the router and the automatic settings on your TC is about right - unless you have general WiFi issues.
Your slower speed is down to the older Airport card in your MBP.

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