AR 10013130, Operating And Service Manual

Page: 23 / 68

Model 2000TP2G8B
Rev - 13
3.2.8 Optional External Filter/Switch Connection
When supplied with this TWTA, the optional external harmonic filter / switch assembly may be used to
further reduce harmonic power in a sub-band. The TWTA output connects to the input of a two-position
switch via a coax cable. The switch routes the RF to the appropriate band depending upon the sub-band
selected:
•
LOW band selection: routes to a low pass filter for operation from 2.5 – 4.6 GHz.
•
HIGH band selection: routes to a low pass filter or coax cable for operation from 4.6 – 7.5 GHz.
Switching is controlled locally, through the TWTA front panel, or remotely over the TWTA’s GPIB
interface. Switch(es) should not be manually operated.
CAUTION:
The operating frequency must be within the pass band for the filter.
Band Frequency range
Low 2.5 to 4.6 GHz
High 4.6 to 7.5 GHz
3.2.8.1 Assembly Instructions for Harmonic Filter Switching Kit (2 Filters)
The Harmonic Filter Switching Kit can be used connected to the TWTA or either filter can be removed from
the kit and used individually. To assemble the kit to the TWTA connect the coax cable E01036-000 to the RF
output connector of the TWTA. Connect the Bandswitch Control Cable to the Interlock connector on the
TWTA, removing any existing plug present. Check that both round connectors of the Bandswitch Control
Cable are connected to the switches, P2 to S1 and P3 to S2. See Section 3.2.6 for additional information
describing use of the external interlock.
Individual filters can be connected directly to the TWTA rf output. If filters have been removed from the
assembly for individual use, re-assemble the kit according to the schematic 10-30528-000, using Parts List
A30528-000 as a reference.