The XTD-400 is a compact self contained antenna mountable high power amplifier (HPA)
designed for low cost installation and long life. The outdoor design eliminates the need
for an amplifier shelter as well as a long waveguide run between the amplifier and the
antenna feed horn. RF filters, cooling, and monitoring & control (M&C) systems are all
self contained within the HPA. These features provide high reliability, low maintenance
costs, and low replacement costs.
No Shelter Required
Short Waveguide Run
Power Factor Corrected
High Efficiency Dual-Stage TWTs
Complete RS-232/422/ 485 Interface
The XTD-400 uses high efficiency dual-stage collector Traveling Wave Tubes (TWT). Some
benefits of this type of TWT are:
Reduced prime power consumption
Lower internal operating temperatures
These benefits are obtained for both the linear and saturated modes of operation.
The XTD-400 incorporates power factor correction circuitry, which minimizes line current
distortion and reduces the required Volt-Amps. The combination of power factor correction and
high efficiency TWTs reduces input Volt-Amps by 45% when compared to equivalent amplifiers. A
high frequency resonant conversion power supply is used that accepts a wide range of prime
power (100 to 260 VAC). the automatic features of the power supply include quick recovery
from prime power outages and multiple helix arc fault resets (three fault cycles).
A complete serial M&C system is built into the unit.
The XTD-400 may be configured for single thread, redundant, phase-combined, or linearized operation.
A remote external controller is available to operate the HPA from a user selected location.
Mounting brackets can be supplied to mount the HPA to most popular antennas.
13.75 to 14.5 GHz
(12.75 to 14.5 GHz) (option)
Traveling Wave Tube
Rated Power @ Amplifier Flange
Large Signal, minimum
Small Signal, minimum
Attenuator Range (continuous)
Maximum SSG Variation Over:
Any narrow band
1.0 dB per 80 MHz
± 0.04 dB/MHz
Stability, 24 Hr maximum
± 0.25 dB
± 1.0 dB maximum over temperature range at any frequency
with two equal signals
- 18 dBc maximum with two equal carriers at
4 dB total power backoff from rated output
HARMONIC OUTPUT, maximum
- 60 dBc
AM/PM CONVERSION, maximum
2.5 deg/dB at 6 dB below rated output power
NOISE POWER, maximum
- 70 dBW/4 kHz
- 150 dBW/4 kHz
10.95 to 12.75 GHz
Group Delay Max over any 80 MHz Bandwidth