One very important note - it's a relatively clean site RF-wise at UHF freqs, and I have a window filter on the front end before the preamp, otherwise forget it with that kind of sensitivity!
--- In [email protected], "kk2ed" <[EMAIL PROTECTED]> wrote: > > I have a site where my GasFet preamp would blow every spring like > clockwork. Seems as though once lightning season started, just the > static in the air from strikes afar would take it out. After the 3rd > time, I switched to a bipolar version preamp, and have not touched it > in 7 years. Not able to tell any difference. The squelch opens > at .07uV, the lowest setting on the service monitor. I have to either > pull the cable or switch the generator output off the RF in and over > to the Gen out to get the receiver to squelch. (Micor rx, btw). > > > > > > > --- In [email protected], "skipp025" <skipp025@> > wrote: > > > > At one location I had an ongoing problem with gasfet preamp > failures. > > Over time I suspected the failures were done on purpose (yeah > people > > do those sort of things). . > > > > I replaced the last blown preamp with a similar spec unit that > > contained internal rf bypass switching when transmit power is > > detected in the coax line. > > > > The system has been rock solid since the rf sense switching preamp > > was placed in service. No more in-line attenuator... and we can > > actually control the preamp from the site controller. If the preamp > > fails we can switch it off (out of line) while the service call is > > set up. > > > > cheers, > > skipp > > > > > "JOHN MACKEY" <jmackey@> wrote: > > > When the ARR pre-amp blows it becomes about a 40DB attenuator, > > > just like most other pre-amps > > > > > >
