Several things to check,is the power supply voltage dropping off? Does the current drop when the power drops? Check exciter output and alignment. Check all high current connections in the amp,collectors,power rails,pass transistor,power combiner coil. Re-check the output link to the filter board-should use a short piece of flexable wire there so it doesnt reoccur. Check the RCA output jack and plug,I hate those! If its the relay type,did it fail? Remove the relay and bypass it. Check coax jumpers. Hope this helps,I have fixed a few in my day....73,Lee,N3APP
[EMAIL PROTECTED] wrote: > Local 2 mtr repeater using MastrII Base repeater station experiencing > power amp failure. Circuit board 19D424266G1 Rev3. I do not have > manual. Am told its a 100 watt unit. It does not have the 4 parallel > output transistors in PA section. Symptoms are: turn up power > control to 90 watts and ok until you drop input, rekey and it will not > produce output power. Crank power pot back down, turn it up to 90 > watts again and it will run 90 watts all day until you unkey driver > again. (using .5 watt HT for testing). Unit had the typical circuit > board break on output pin to filter board. Repaired same. Unit also > pulses rf power badly and can see amplitude pulse on analyzer. No > spurs on sidebands. If anyone cares to comment I would appreciate it. > Thanks, > Gary K2UQ > > > > > > > > > ------------------------------------------------------------------------ > *Yahoo! Groups Links* > > * To visit your group on the web, go to: > http://groups.yahoo.com/group/Repeater-Builder/ > > * To unsubscribe from this group, send an email to: > [EMAIL PROTECTED] > <mailto:[EMAIL PROTECTED]> > > * Your use of Yahoo! Groups is subject to the Yahoo! Terms of > Service <http://docs.yahoo.com/info/terms/>. > > Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
