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Training OPERATION of TWTA Products HPA XICOM
Preventive Maintenance
Weekly : Using a soft damp cloth,clean the Front Panel.
Montly :
1.Check the integrity of the output waveguide flange mounting bolts. Tighten as necessary.
2.Check the integrity the RF Input cable connected to the rear panel
3.Check the input and output air port. If the filter is dirty preform the Air filter
Removal procedure
Air Filter Removal Procedure :
Use this procedure to remove, clean, and replace the air filter.
1.Remove and retain the four screws holding the filter guard to the rear panel.
2.Remove the Air Filter.
3.Using low pressure air, blow the dust from the air filter.
4.Reinstall the Air Filter.
5.Using the four screws retained in step 1, reinstall the filter guard.
A traveling wave tube amplifier is an electronic device used to produce high-power
radio frequency signals. The bandwidth of a broadband TWTA can be as high as one
octave, although tuned (narrowband) versions exist, and operating frequencies range
from 300 MHz to 50 GHz.
A TWTA consists of a traveling wave tube (TWT) coupled with its protection circuits (as
in klystron) and regulated power supply (EPC, electronic power conditioner), which may
be supplied and integrated by a different manufacturer. The main difference between
most power supplies and those for vacuum tubes is that efficient vacuum tubes have
depressed collectors to recycle kinetic energy of the electrons and therefore the
secondary winding of the power supply needs up to 6 taps of which the helix voltage
needs precise regulation. The subsequent addition of a linearizer (as for inductive
output tube ) can, by complementary compensation, improve the gain compression and
other characteristics of the TWTA; this combination is called a linearized TWTA.
Broadband TWTAs generally use a helix TWT, and achieve less than 2.5 kW output
power. TWTAs using a coupled cavity TWT can achieve 15 kW output power, but at the
expense of bandwidth.
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