Comtech EF Data XTRT-400C Operation And Installation Manual page 45

MNC-0300-070
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1 Position the interconnecting waveguide flange with the ampli-
fier waveguide flange. Make sure that the flanges can be
mated without strain or torsion.
2. If the two flanges cannot be properly aligned or if the
installation is subject to vibration, a flexible waveguide
section should be utilized to eliminate potential strain on the
waveguide connection.
3. Insert any necessary gaskets and windows between the two
flanges.
The waveguide that is connected to the HPAs
should have a good match of 1.5:1 or better for
optimal performance. Waveguide connected to tri-
band HPAs (C, X, Ku) and dual-band HPAs (C,
Ku) in particular need to have this match. These
HPAs do not contain isolators due to their
bandwidths. Also, the in-band harmonics of
excessive power reflected into the HPA can cause
damage to the TWT. It is recommended that a
transition is made to rectangular waveguide and an
isolator used to assure a good match to the HPA
and to absorb reflected powers at the harmonic
frequencies. The typical output VSWR of isolators
when included in the HPA is 1.3:1.
If the connecting waveguide is to be pressurized at
greater than 5 PSI, a waveguide window must be
installed at the output flange of the amplifier. Use a
conductive type gasket to preclude radiation
leakage.
4. Start by hand tightening all waveguide mounting screws.
5. Tighten all mounting screws with the appropriate size Allen
wrench.
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Unpacking and Installation
Note
Note
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