Good Morning Tom, I would have to run the driver just about on full bore though. (because of the 30 in 100 out amp...again only running it right now at 75 watts) I am a little nervous on running it like that. I wonder if anyone else is running the driver that hard and getting good results?? Thanks, Robert
--- In [email protected], "Thomas Oliver" <[EMAIL PROTECTED]> wrote: > Does the amp have separate driver and final boards? if so you can take the > final board right out and just run the driver it should be good for 15-20 > watts on that size heat sink. If it is the amp I am thinking of the driver > board is the same board used in MVP and Exec II's there are others out > there that are a single board with drivers and finals all on the same board > (tripler) these are not recommended for repeater duty but your mileage may > vary. > > tom n8ies > > > > [Original Message] > > From: georgiaskywarn <[EMAIL PROTECTED]> > > To: <[email protected]> > > Date: 3/2/2005 8:26:30 PM > > Subject: [Repeater-Builder] Re: GE Mastr II Power Drop > > > > > > > > Thanks guys for the suggestions.... > > I do have 2 4" fans on the fins. I do realize about what you and Skip > > mentioned as well as far as running it below 50%. The PA...being > > "tuned" (with caps) on the 450 band...really puts out about 55 watts > > in the 440 band. I haven't ran this pa...but have ran another one > > (that got hit by lightning) for several years in this same setup with > > no problems. It also holds a key down for a solid hour and 1/2 every > > Wednesday night (http://stoddard.homeip.net/SLRN/) with no problems. > > It just has popped up within the past month. Will have to go and > > re-read that thread. > > Thanks, > > Robert > > > > > > --- In [email protected], Q <[EMAIL PROTECTED]> wrote: > > > My guess is that its overheating and protecting itself.Are you using > > > cooling fans? You may have a mismatch to the external PA. It is unwise > > > to run any GE PA at less than 50% power,the controlled stage is a > > > driver,not the final. There was a thread on here a while back about > > > impedance changes and instability when running below designed power > > > output levels. I'd bet if you ran the GE at 75 watts and forget the > > > outboard amp,nobody could tell any difference. But being on a mobile > > > heatsink,it will not do 100% duty cycle. I ran one at 50 watts with > > lots > > > of fan cooling without any problems,remember 50 watts is only 3db down > > > from 100 and will draw much less current than you are now! > > > > > > [EMAIL PROTECTED] wrote: > > > > > > >I have a UHF repeater made from a GE Mastr II converted mobile. > > The PA that is in it is a 75 watt turned down to about 20 watts. It > > is driving a 100 watt amp (30 in 100 out) so it is putting about 75 > > watts into the cans. The whole setup pulls about 18 amps. > > > > > > > >Recently I found the power to drop down on the GE to about 4 or 6 > > watts. The amps would drop but only about 4 to 6 amps (from the 18). > > Touching the power trans. on the driver...they are pretty cool. The > > power trans. on the main PA is hot. I can mess with the "driver pot" > > and the power comes back up. I have cleaned it with spray several > > times...but find it dropping back down. I have also checked the > > stripline between the pa and harmonic filter with a mag. glass...no > > cracks (had this in another repeater to happen). > > > > > > > >Ideas? > > > >Thanks, > > > >Robert > > > > > > > >___________________________________________________________________ > > > >Speed up your surfing with Juno SpeedBand. > > > >Now includes pop-up blocker! > > > >Only $14.95/month -visit http://www.juno.com/surf to sign up today! > > > > > > > > > > > > > > > > > > > > > > > > > > > >Yahoo! Groups Links > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > Yahoo! Groups Links > > > > > > > > > > > > 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/
