Product User Manual
Page 9
Model GA101x Series High Power E-H Tuner
2002-2003 Gerling Applied Engineering, Inc.
Modesto, CA
False Null
The above procedure can sometimes lead to a false indication of
reflected power minimization. That is, it may appear that adjusting
either plunger will result in an increase of reflected power. This
“false null” can be overcome by detuning one plunger and retuning
the other in order to find another null using different plunger
positions.
High Power Operation
The GA101x series tuners are designed for continuous use at
microwave power levels up to 6kW depending on model. However,
under certain high power conditions, such as a high Q factor, it may
be possible to cause excessive heating that may be hazardous to
operating personnel and/or result in damage.
The electric field strength in any waveguide device is a function of
both power level and Q factor. Excessively high electric fields can
result in discharge (arcing) and/or overheating due to resistive
losses. High Q may be tolerable at low power while the same Q can
be damaging at high power. Although the tuners are expected to
perform satisfactorily under moderate Q factors at higher power
levels, the operator should exercise caution to prevent damage due
to arcing or overheating under these conditions.
