Hi Bob, The PA is ok, as it is working fine with other Micor power supplies. Or should I say, the current draw is within spec. This supply was tested in two different Micor systems with the same results.
I will dive into it this weekend. Eric KE2D --- In Repeater-Builder@yahoogroups.com, "Bob M." <[EMAIL PROTECTED]> wrote: > > If it's the TPN1110 supply, the PA supply is very > simple. A ferro-resonant transformer, two diodes, and > LOTS of capacitors. The transistors are for the > low-current regulated supply. > > One diode could be open. If so, I'd expect a lot of > ripple on the supply and low voltage. If one cap was > bad, I doubt you'd even notice it. > > The PA could also be drawing a lot more than the 25 > amps the supply is rated for, thus giving you less > voltage to feed it. > > Your wattmeter or load could be in error, thus forcing > the above condition. > > Bob M. > ====== > --- kk2ed <[EMAIL PROTECTED]> wrote: > > > Good Afternoon, > > > > While going thru my Micor stuff, I found that one of > > my station power > > supplies (TRN1011?) suffers from voltage sag under > > load. I know that > > by design the power supply voltage should drop under > > load. Most will > > idle around 15v, then drop to about 13v under load > > of a 100w PA. But > > this unit is sagging to almost 11v under heavy > > loads, thus resulting > > in the PA output being lower than normal. Anyone > > have this issue > > before and know what the cause might be? One of > > the two > > pass/regulator transistors bad? Transformer on the > > way out? Or bad > > cap? Suggestions appreciated before I tear into it. > > > > Eric > > KE2D > > > ______________________________________________________________________ ______________ > Luggage? GPS? Comic books? > Check out fitting gifts for grads at Yahoo! Search > http://search.yahoo.com/search? fr=oni_on_mail&p=graduation+gifts&cs=bz >
