IPod touches don't connect to home network

Question

For some time, the two iPod touches in our household have had trouble connecting to our home network.  There have been no problems with other networks. We have a cable modem connected to a Time Capsule, which creates the network, with no extenders or bridges.  Our other Macs, two Macbooks and an iMac, have no problem whatsoever connecting. The iPod touches have performed variably getting connected, sometimes appearing to be connected, but slow, sometimes "Unable to join the network".  The problem improved for a while, after trying all of the things suggested in the support documents and communities, and resetting the Time Capsule, recreating the network with a new name and password.
In the last few days the iPod Touches have completely stopped connecting to the network again.  Even the name of the network only shows up sporadically to attempt entering the password. There is no connection with or without the WPA2 Personal security on. One thing that might be related is that when I look at System Profiler>Network>Airport there are sometimes two networks listed with my network's name, one under "Current Network" and one under "Other Local Wireless Networks".  Interestingly, they are on different channels. The Current network is on "149,1" and the other is on "3". Occasionally I can see neighbors' networks, with much worse signal/noise ratios as one would suspect, so I'm not too suspicious of interference from that source although the channels are always single digit ones there. My understanding from my reading in the support documents is that the iPods connect only at 2.4GHz, which would be the single digit channels.  I did try changing the channel width to 20MHz instead of 40MHz once, and that didn't seem to make a difference, so I changed it back.  Otherwise, all is set as per this document:   http://support.apple.com/kb/HT4199
Can anyone help?

Answer 1

I decided it was time to take the Time Capsule and one of the iPods to the local Mac Store, for repair of the Time Capsule.  Everything worked fine!  I came back home and rechecked the home for all the things in this article: http://support.apple.com/kb/HT1365  and once again found none. 
The Mac technician's suggeston was to try specifying the channel, as opposed to letting the Time Capsule automatically choose the "best" one.  It worked!  (I chose channel 8, since I had not seen it used by my networks or neighbors' when I looked in System Profiler.)
Just adding this post in case it helps someone else.