I prefer usually for the "smaller" field set to use home brew battery boxes. Battery power is very quite and very reliable. Dollar store batteries are my favorite but be sure and test them under at least a 25 ma load for a short(2 or 3 seconds) period. PRC-6 and BC-611 see my web pages at: http://k4che.com/PRC-6%20Battery%20Box.htm 73 breck k4che