Something is wrong... Things to look for are under sized
loads, the wrong type of metal mounting hardware, out of
tune operation and cooling issues. Under power the
circulator will change tuning, heat can cause it to really
change. You should have at least some modest air movement
past a circulator with >50 watts through power.
The load can run hot, but not past its max value. Over
35 watts the better load connection is external from the
main cirulator body to keep heat away.
The amplifier should have both voltage and serious current
protection to prevent damage.
skipp
> DCFluX <[EMAIL PROTECTED]> wrote:
> I've had to send of and repair a 150W rated EMR circulator
> 5 times so far, and it keeps blowing up. The last time it
> went it took the transmitters power FET with it. VSWR on
> the antenna is near perfect with 146 forward for 4 watts
> reflected. Transmitter runs fine on just the antenna, but
> I can only seem to get 1 to 2 weeks of life out of the
> circulator.
>
> On 1/12/06, skipp025 <[EMAIL PROTECTED]> wrote:
> >
> > At some of the high level Metro Radio Sites with
> > mulitple Broadcast Stations going full tilt, you
> > can easily have a hundred watts or more of rf
> > comming back down the feed line.
> >
> > You need the right size/type circulator. A shorted
> > coax stub is nice to have in addition to the circulator,
> > but you should be running a circulator/isolator at
> > any site with busy rf.
> >
> > skip
> >
> > > I blow up circulators, try a shorted coaxial stub instead.
> > >
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