Can time capsule connect to ethernet through airport extreme and then send wifi on a different band ?

Question

Hope this makes sense.
At the moment, an Airport Extreme (n) is connected to a single wall outlet by ethernet and sends wifi signals at both 2,4 and 5 GHz.
I would like to add a Time Capsule (also n), position it immediately next to or above this Airport Extreme and connect to the AE with a very short ethernet cable (so not extending the Extreme's wifi signal since that could reduce the signal's strength by half).
This way both are connected to the internet by ethernet (the AE directly to the wall outlet, and the TC to the AE's ethernet out), hence both should be able to send wifi at full signal strength.
In order to achieve full wifi strength I would then set the Extreme to (only) send at 2,4 GHz and the Capsule to (only) send at 5 GHz.
Please note that the house has an open (loft style) floorplan, so there's no reason to position the AE and the TC at a distance from each other for wifi reach throughout the house.
Dear Bob, what do you think? I've been reading up but didn't find a directly related post.
Is this the right way to go about it?
KInd regards.

Answer 1

I would like to add a Time Capsule (also n), position it immediately next to or above this Airport Extreme
The position immediately above is poor.. and next to each other is even worse.. you are blocking the antennas from one side or the other..
Please  use a patch lead of around 2M (6feet) min.. and place them that far apart.
very short ethernet cable (so not extending the Extreme's wifi signal since that could reduce the signal's strength by half).
Having the devices link wirelessly causes the speed to drop by half which is caused by double hop wireless.. it does not reduce signal actually.. but you can have interference issues.
In order to achieve full wifi strength I would then set the Extreme to (only) send at 2,4 GHz and the Capsule to (only) send at 5 GHz.
Please note that the house has an open (loft style) floorplan, so there's no reason to position the AE and the TC at a distance from each other for wifi reach throughout the house.
The gap between two radio transmitters is so they don't flood the receiver on the unit next to them.. It has nothing to do with the room. If I stick two transmitter/receivers next to each other they need some space. It is also to give full access to the antennas which are spaced around the sides on the older N models.
You also cannot turn off one band.. If they are dual band models.. ie Gen3 AE and later. Gen2 TC and later.. they are permanently dual band. You cannot do anything about it.
You can simply set the channels.. although auto should work.. there are 11 channels for 2.4ghz.. set one to channel 1 and the other to 11.
At 5ghz there are heaps of channels.. set one to 36 and the other to 149.. or whatever is available.
You are not going to achieve anything much doing this unless you have more clients than bandwidth.. ie both boxes can fully service internet to up to 10 clients.. maybe more if each band is used properly.. you will gain nothing using two routers next to each other.
Beaten by your preferred forum eggs spurt.. !!