Most every mfgr is guilty of flashing the low duty cycle pa values with bold print but the commercial service lock to talk numbers seem to get lost in the small print.
After the Motorola Service Manual arrives... I'll let you know what I/we find with the 1225 repeater pa. cheers, skipp > "rtc_0001" <[EMAIL PROTECTED]> wrote: > > It's not so much a defect as it is asking the rptr to do more > than it was designed for. It may be a 45 watt PA but in rptr > use, medium to HD rptr use, drop it down to about 25 to 30 > watts out of the PA. Enjoy what you get thru the duplexer. > Asking for more will melt the PA. > > The earlier units had a temp controlled fan that only came on > when the > PA was about to melt. The next generation of power supplies came with a > switch to turn the fan on permanently. > > You will probably be able to fix them without the manual. Most of the > time the PA transistor collector got hot, melted the solder & the chip > caps moved (slid down the pcb due to gravity). > > I repaired these on a regular basis without needing new parts unless the > damage literaly burnt the pcb around the collector lead. I removed the > chip caps, removed the solder on the collector tab & trace & resoldered > it all back in with silver solder. This, along with turning the factory > output down, made them last a long time even under HD casino use. > > I think it took me maybe 45-60 mins to get it all apart, fix it, > reassemble, reinstall. Lots of times I did it in place at the customer's > premises. rtc > > > > > > > > > -----Original Message----- > > From: [email protected] > <mailto:[email protected]> > > Sent: Friday, July 13, 2007 11:08 AM > > To: [email protected] > > Subject: [Repeater-Builder] Re: Motorola R1225 versus Kenwood TKR-750 > > > > Hi Eric, > > > > <SNIP> > > > > I just pulled three 1225 uhf repeaters from two different locations > > and they all have the same failed tx pa problems. Wonder if there's > > a minor pa defect problem (like there was in early version one tkr > > repeaters) or it's just bad customer karma time. I've got to find > > a service manual before we open them up... > > > > cheers, > > skipp >
