Xicom XTU-400K, Operation And Installation Manual

Page: 45 / 189

Unpacking and Installation, TWTA Octagon CPU
MNC-0300-003 7 of 22 Revision N
Vorsicht
Wenn Hohlleiter-Flanschen nicht mit dem externen
Hohlleiter-System oder einer terminierten Belastung
verbunden sind, sollten sie mit einer Schutzkappe oder
Band abgedeckt werden, das beim Entfernen keine
Kleberrückstände hinterlässt. Xicom empfiehlt die
Verwendung von Kapton® Band, 3M Brand, #92,
Xicom P/N 602-0001-001. Band oder Kappe vor der
endgültigen Aufstellung entfernen. Nichtbefolgen
könnte Verunreinigung des internen Hohlleitersystems
oder Beschädigung von TWT und Gerät zur Folge
haben.
1 Position the interconnecting waveguide flange with the amplifier
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.
Note
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.
Note
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 an
absorptive type gasket to preclude radiation leakage.
4. Start by hand tightening all waveguide mounting screws.