#10781 NORM 11.3.0: Distance Activity needs to enforce sane Atmospheric conditions

[Zarro Boogs per Child]

#10781: Distance Activity needs to enforce sane Atmospheric conditions
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           Reporter:  greenfeld       |       Owner:  godiard                          
               Type:  defect          |      Status:  new                              
           Priority:  normal          |   Milestone:  11.3.0                           
          Component:  other-activity  |     Version:  Development build as of this date
         Resolution:                  |    Keywords:                                   
        Next_action:  test in build   |    Verified:  0                                
Deployment_affected:                  |   Blockedby:                                   
           Blocking:                  |  
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Comment(by greenfeld):

 Tried to test but the distance activity is currently broken when one tries
 to start measuring:

 Unhandled exception in thread started by <bound method
 AcousticMeasureActivity._helper_thread of <AcousticMeasureActivity object
 at 0x8cfbd9c (SugarActivity at 0x882d160)>>
 Traceback (most recent call last):
   File "/home/olpc/Activities/Distance.activity/activity.py", line 291, in
 _helper_thread
     dt = arange.measure_dt_seq(self.main_socket, self.initiating,
 self._change_message)
   File "/home/olpc/Activities/Distance.activity/arange.py", line 418, in
 measure_dt_seq
     mls = compute_mls(R)
   File "/home/olpc/Activities/Distance.activity/arange.py", line 84, in
 compute_mls
     return LFSR(Rf, [i - 1 for i in taps[n]], 2**n - 1)
 NameError: global name 'Rf' is not defined
 ~

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Ticket URL: <http://dev.laptop.org/ticket/10781#comment:9>
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