CPI 400W Ku-Band Travelling Wave Tube Amplifier TWTA 13.75-14.50GHz VZU-6994AD tested with report

The CPI TWTA Ku-band model VZU6994AD provides 400 watts of power in a 3 rack unit package, digital ready, for wideband, single- and multi-carrier satellite service in the Ku-band frequency band. Ideal for transportable and fixed earth station applications where space and prime power are at a premium.
The VZU6994 employs a high efficiency dual-depressed collector helix traveling wave tube backed by many years of field-proven experience in airborne and military applications. This TWTA is user-friendly microprocessor-controlled logic with integrated computer interface. Digital metering, pin diode attenuation and optional integrated linearizer for improved intermodulation performance.

The VZU6994AD meets International Safety Standard EN-60215, Electromagnetic Compatibility 89/336/EEC and Harmonic Standard EN-61000-3-2 to satisfy worldwide requirements. Its is easy to maintain due to the modular design and built-in fault diagnostic capability with convenient and clearly visible indicators behind front panel door for easy maintainability in the field.

Electrical Specifications VZU-6994

Frequency:  13.75 to 14.50GHz, 
Output Power TWT: 400W min. (55.44dBm), 13.75 to 14.5GHz and 13.75 to 14.80GHz
   350W min. (56.02dBm), all others
Output Power Flange: 338W min. (54.39dBm), 13.75 to 14.5GHz and 13.7\5 to 14.80GHz
   275W min. (55.31dBm), all others
Bandwidth:   500 to 1,750MHz depending on configuration
Gain:            73 dB min. at rated power output; 78 dB min. at small signal
RF Level Adjust Range: 0 to 20 dB
Gain Stability:   ±0.25 dB/24hr max. (at constant drive and temp.)
Small Signal Gain Slope:       ±0.015 dB/MHz max.
Small Signal Gain Variation:  1.0dB pk-pk across any 80MHz band; 2.5dB pk-pk across the 750MHz band
Input VSWR:                        1.3:1 max.
Output VSWR:                      1.3:1 max.
Load VSWR:   2.0:1 max. operational; any value for operation without damage

Residual AM:      -50dBc below 10 kHz
                         -20[1.3 +log F(kHz)] dBc,
                         10kHz to 500kHz
                         -85dBc above 500 kHz

Phase Noise
- IESS Phase Noise Profile:    -6dBc
- AC Fundamental:                -36dBc
- Sum of All Spurs:                -47dBc

AM/PM Conversion:  2°/dB max. for a single carrier at
8dB below rated power

Harmonic Output:   -60dBc at rated power, second and third harmonics

Noise and Spurious:  <-150dBW/4 kHz in Receive Reject band
(at rated gain)   < -65dBW/4 kHz in Passband to 18GHz
 < -60dBW/4 kHz in Passband w/linearizer
 
Noise Figure:            10dB max.

Intermodulation: -24dBc max. with two equal carriers at total output power 7dB (4 dB with optional integral linearizer) below rated single-carrier output; -22dBc max. at 7dB 080 (4dB W/h) for 14.7-15.2GHz config.

Group Delay:                  0.01ns/MHz linear max.
(in any 80 MHz band)     0.001ns/MHz2 parabolic max.
                                      0.5ns pk-pk ripple max.
Primary Power:   100 - 240VAC ±10%, single phase 47- 63 Hz (100VAC optional)
Power Consumption:      0.85kVA, typ.
                                      1.0kVA, max.
Power Factor:                 0.95 min.