Please see Allen's post here on the differences between the Narrow and Wide radio: http://community.cambiumnetworks.com/t5/PTP-820-Licensed-Microwave/How-to-distinguish-which-radios-support-80-Mhz-channels/m-p/36384#U36384
In LINKPlanner, when one selects an 80 MHz channel with a Narrow radio, the capacity is limited to the same capacity as a 60 MHz channel, and the channel selection for center frequencies is based on an 80 MHz bandwidth.
Notice that the FCC doesn't allow the use of 60 MHz channels in these frequency bands, so one has to license the link as per the LINKPlanner selection.
In LINKPlanner, when one selects a Wide radio, the only channel size that LINKPlanner shows is 80 MHz. (Note above in Allen's post the key words: "up to 80 MHz".)
How then, should one plan links with 30, 40, etc. MHz channels using a Wide radio?
Select the Narrow radio if you need to plan links with 30, 40, etc. MHz channels using a Wide radio.
Be careful when ordering, and be careful when generating the proposal and installation reports.
I hope this helps!
Dave