开云体育I have tested several hundred YIG devices over my career. (Have drawers
full of them, its a sickness)? I have seen more misaligned YIG support rods
or bad oscillator semiconductors than I have seen bad coils.
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Sometimes the coil connection fails at the solder point due to wire
wrap/crimp failure and current heating the joint, eventually it opens, have
fixed three like this. Some model YIGs have high coil current and if poorly
cooled/heatsunk, the enamel insulation seems to fail and create a sorted coil.
Only have seen one like this, but opened it up and figured out the
failure.
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Other times, the polystyrene rod that holds the YIG sphere warps &
twists over time from heat?& general plasticizer failure?and
misaligns the magnetic axis of the sphere with the field, pretty tough to fix
this, major cause of holes and high end tailing off.
And, of course, when the semiconductor device fails (Gunn diode in older X
band and up, Bipolar thru 12 GHz for old ones, FET now), you are done.
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It is possible to re-fit different YIGs into various pieces of gear, but
re-scaling the drivers to the right coil sensitivities can be
challenging/time-consuming.
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The worst thing to deal with is the wideband? YIG tuned multipliers.
Never had much luck bringing these back to life once they go south.
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YMMV
Jeff Kruth
WA3ZKR
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In a message dated 10/15/2017 1:40:13 P.M. Eastern Daylight Time,
hp_agilent_equipment@... writes:
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