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ath9k: ar9220 does rx but no tx on antenna B

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in experimenting with writing antenna control for ath9k from user nl80211 user
space found experimentally, verified with several R52n miniPCI ar9220 boards,
that the current ath9k does not transmit on antenna B but does receive. Only on
antenna A association/authentication and communication is possible.
Have tried all sorts of settings for registers $8004 (AR_STA_ID1) masks
200000/40000/80000/400000 and $8058 (default antenna) and enabling/disabling
ccmp and cck diversity but cannot get antenna B to transmit.
What is the proper way to switch between 
1) mimo 80211.n operation and 
2) single antenna no-diversity operation, or
3) sectored operation giving all available antennas some airtime and beacons and
answering on basis of best reception results ? 
As said current ath9k seems not to initialize the ar9220 properly for mimo mode
on the R52n board that has two PAs but now only can use one.

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