Hi I would second Paul’s input. Is the unit actually working at the moment? Some of the circuits in these gizmos *do* run pretty hot in normal operation.
If there is a problem with that device, before I paid $67 for the replacement part (or anything close to that) I probably would convert it all to 10 MHz out. The whole “15 MHz” thing made sense to Lucent. It does not make a lot of sense to anybody who is not making CDMA base stations. Bob > On Jan 10, 2018, at 9:21 AM, paul swed <paulsw...@gmail.com> wrote: > > Pat > Here is my thought. Everything may be just fine actually. This looks like > the same approach used on older technology even the transistor. Its job is > to run class AB1 and boost the signal to something like +27 dbm. Lots of > power. > The reason is these then typically drive a passive 8 or 16 way splitter to > drive the various systems in the cel tower.. > Regards > Paul. > WB8TSL > > On Wed, Jan 10, 2018 at 12:33 AM, Patrick Murphy <fgdhr...@gmail.com> wrote: > >> My recently purchased RFTGm-II-XO threw a fault today. When I opened it, >> the unmistakable smell of something way too hot was released. I guess this >> is one bad aspect of the totally sealed enclosures these come in. Anyway, >> when I plugged it in while open, I found U105, the microwave transistor >> about centered in the attached photo was getting way too hot. It appears to >> be an unmarked microwave transistor, probably part of the 15MHz output >> circuit. VR101 - a 7815 on the far right is also getting pretty hot. I >> expect the two are connected. >> >> Anyone have an idea of what the nomenclature for U105 is? Replacing it may >> be a pipe dream, but knowing its name will be a good first step. >> >> Thanks for any assist. >> >> -Pat >> >> _______________________________________________ >> time-nuts mailing list -- time-nuts@febo.com >> To unsubscribe, go to https://www.febo.com/cgi-bin/ >> mailman/listinfo/time-nuts >> and follow the instructions there. >> > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.