Comtech EF Data HPCST-5000 - Manual (Page 126)

TWT Amplifiers High-Power TWTA Satellite Terminals
4–8 Rev. 1
4.1.4 Initial Power-Up
The following checklist should be followed to ensure proper operation of the amplifier
and to avoid permanent damage to it.
C AU TIO N
Failure to observe any of the following instructions may cause permanent
damage to the amplifier and will void the warranty.
4.1.4.1 Pre-Power Check
1. The prime power voltage is within the specified limits of the amplifier. (Refer to
Chapter 1 for the unit’s specifications.) The correct power input connector pins
must be used, depending on voltage level and prime power source.
(See Section 2.3.4.2 and Figure 2-6.)
2. The amplifier is installed within an enclosure. The exhaust air from the amplifier
should be ducted to the outside of the cabinet so that the warm air is not re-
circulated into the amplifier air intake.
3. The RF output is terminated with a load capable of dissipating 500W CW. This
load should have a maximum VSWR of 2.2:1.
4. The RF drive signal is within the frequency range of the amplifier specification
and does not exceed by more than 2 dB of the input power required to saturate
the TWT.
C AU TIO N
Exceeding the input power limit will cause a helix current fault and
may permanently damage the TWT.