Not sure what you are asking here.
If you have an Apple AirPort router providing your wireless signal, the AirPort router automatically scans to find what it thinks is the best wireless channel to use.
If you have a utility that scans to allow you to "see" other wireless network around you....and you feel that you can make a better channel choice than the scanner on your AirPort router....it is possible to manually set the channel on the AirPort.
Is that what you are asking?
If yes, we need to know what operating system....Mountain Lion, LIon, Snow Leopard, etc.....that you are using on your Mac to tell you how to change the wireless channel manually.
Internet connection are rather slow and intermittent. Was simply wondering if there was some manual way by which we could ensure that all the devices connected to the airport/ time machine were on different channels.
There was a way of doing this in the past.
Was simply wondering if there was some manual way by which we could ensure that all the devices connected to the airport/ time machine were on different channels.
Your AirPort router can only broadcast on one channel at a time on the 2.4 GHz band and 5 GHz band. Nothing has changed in this regard.
You can select from Channels 1-11 on 2.4 GHz and 149, 153, 157 and 161 on 5 GHz.
If you want to try to out think the scanner on your AirPort router you can do so.....recall above, we asked for the operating system that your computer was using to be able to provide specific instructions.
If you post back with that information, we can give you the exact steps to manually select channels. This is no guarantee that your choice of a channel will be better than the AirPort's, but you never know.