Jim has posted RTCM version 1.26 to svn. It allows a lower minimum TX buffer length of 480 (60ms). We ran the min setting on a 20 mile Ubiquiti hop and it worked fine.
http://svn.ohnosec.org/viewvc/projects/allstar/voter/?root=svn
I've posted a procedure to determine RTCM and chan_voter buffer size using voter ping.
http://ohnosec.org/drupal/node/195
--
Tim WD6AWP
:wq