Richard,
My previous experience with TWT amplifiers is that as you say they do
not like excessive VSWR's. Chamber efects is one thing that would cause bad
VSWR. Another way is turning them on before the antenna is attached.
Another way is to misthread the acble attached to the TWT.
I seem to remember that certain TWT's came with an option of an
isolator on the input that made them better able to handle short term bad
VSWR's. If the one you are looking at has this option it would be a plus.
My general experience is be very carfeul with them and still they may
not last that long. Check the repair history of the used TWT if you can.
Sandy Mazzola
-----Original Message-----
From: [email protected] [mailto:[email protected]]
Sent: Wednesday, November 13, 2002 9:00 AM
To: [email protected]
Subject: Radiated immunity testing above 1 GHz
I need to make a decision on an amplifier for radiated immunity testing in
the 1-2 GHz range. The choices appear to be a new solid state amplifier ( I
have not located a used one) or a used TWT amp. Is anyone using a TWT
amplifier for radiated immunity testing above 1 GHz? Do I need to be
concerned about protecting the tube from damage caused by excessive VSWR
cause by, perhaps, chamber effects? Is there anything else I need to know
about TWT amps (yeah, I know - throw it way if the tube dies)?
Richard Woods
Sensormatic Electronics
Tyco International
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