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Suggested Periodic Maintenance for TWT Amplifiers
1.
Keep monthly log of the voltages, currents and temperatures as shown on Menus. Also record
Date, “Console” and “Operate” hours. Take readings in Operate mode with the gain at zero
(0%) percent. Leave unit in Operate mode for 20 minutes (Max Duty if Pulsed Unit), and then
record data. Review the log to identify trends and contact factory if required.
2.
Keep monthly log of performance with active RF. At mid-band frequency, with Gain set to
100%, apply RF drive that will provide rated power. This will help indicate if the gain or power
is changing and if the traveling wave tube or pre-amp needs service. Record the following:
a.
RF Drive Level
b.
Forward Power
c.
Reverse Power
d.
Body Current (Iw)
e.
Sample Port Power reading (if possible).
3.
Remove air intake filter and clean using compressed air and/or vacuum cleaner.
4.
Ensure air inlet and outlet are unobstructed.
5.
Check that AC Input connections are secure. Make sure the AC cable is not damaged or
deteriorated.
6.
Check that both input and output RF connections (waveguide or coax) are connected tightly and
un-damaged.
Rev A
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