Mesh APs 1522 b/g channel issue

Hi,
We have deployed a Mesh network using 1522 APs. Everythings works fine for the A radio, but not for the B/G radio too.
We have configured the b/g radios to automatically select their channel, (Global mode), using channels 1,6,11 through DCA. All the APs
select to use the same channel (11), although they are approximately close one to the other (100m). Transmit power is in Global mode also.
When we reboot the APs, they select to use channel 13 and transmit power level 1 in Custom mode.
Can somebody explain why this is happening? Is this some kind of default bahaviour?
Please advise.

Hi,
  We have an outdoor wireless installation coming up for a public park using 1522. Can you please share the RAP to MAP distances used in your deployment ? For 802.11b/g, will a client to AP distance of 100m give good performance ? will the clients be able to communicate properly at such distances ? Also what approach did you chose to divide the outdoor area and decide on RAP and MAP placements ? Appreciate any suggestions from your experiences.
regards
Joe

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