Introducing ALT-9000: Radio Altimeter Test Solution
Universal Radio Altimeter Testing for Modern Avionics Systems
The VIAVI ALT-9000 is a portable, fiber optic–based test set that enables comprehensive closed-loop testing of all types of radio altimeters — including LPI (Low Probability of Intercept), CARA (Combined Altitude Radar Altimeter), and next-generation radar systems. Designed for avionics technicians, engineers, and maintainers, the ALT-9000 delivers precise altitude simulations using true RF time delay and path loss modeling.
Whether you're validating new avionics installations, performing flight line diagnostics, or troubleshooting complex signal issues, the ALT-9000 offers unmatched versatility and performance in one rugged, battery-operated unit.
Why Choose the ALT-9000 for Radio Altimeter Testing?
- Supports all radar altimeter formats, including legacy and next-gen variants like LPI and CARA.
- Delivers accurate and repeatable altitude testing using fiber optic delay lines — replicating real flight conditions on the ground.
Rugged, Flight-Line Ready
- Lightweight, battery-powered, and enclosed in a durable chassis, perfect for hangar or bench use.
- Large graphical interface provides parametric data like TX power, frequency, FM deviation, PRF, and more.
- Test via UUT TX/RX connectors or aircraft antennas using couplers — flexible for any environment.
- Simulate altitudes from 5 ft* to 10,000 ft (or up to 25,000 ft with options) in 5 ft increments.
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Feature Spotlight: ALT-9000 Altimeter Testing Advantages
The ALT-9000 isn’t just another altimeter test set — it’s a complete solution built for precision, flexibility, and ease of use. Whether you’re troubleshooting complex LPI radar systems or verifying standard installations, the ALT-9000 delivers advanced RF simulation and real-time measurement capabilities in a rugged, flight-line-ready package. With features that support both static and dynamic altitude profiles, direct-connect or over-the-air testing, and intuitive touchscreen control, the ALT-9000 brings lab-grade performance to the hangar floor. Below are the key features that make the ALT-9000 a trusted tool for avionics professionals worldwide:
Complete Closed-Loop Testing
The ALT-9000 allows for full end-to-end testing of radio altimeter systems by closing the RF loop from transmit to receive. This means you can verify performance across the entire signal chain, including antennas, coaxial cables, Line Replaceable Units (LRUs), and cockpit indicators. By isolating faults at the system level, technicians can avoid unnecessary swaps of expensive components, significantly reducing maintenance costs and downtime.
Parametric Measurements
The ALT-9000 delivers real-time visibility into the key operational metrics of most radio altimeters. These include:
- TX Power – Measure transmitted signal strength to assess power consistency
- TX Frequency* – Validate frequency output for compliance and performance
- FM Deviation* – Evaluate the fidelity of frequency modulation
- Pulse Width* – Confirm pulse duration and waveform shape
- PRF* – Assess the Pulse Repetition Frequency
- Sweep Rate* – Verify frequency ramping critical for accurate altitude readings
*Support varies by altimeter type, depending on modulation and signal characteristics.
Direct or Coupler-Based Testing
Perform tests in the hangar with maximum flexibility. The ALT-9000 supports both direct-connect testing via the TX/RX ports and over-the-air testing using antenna couplers. This means technicians can verify system performance without removing hardware, making it ideal for both quick troubleshooting and detailed validation.
Simulate Static and Dynamic Altitudes
The ALT-9000 simulates real-world altitude conditions without ever lifting off the ground. Run static altitude tests from 5 ft to 10,000 ft in 5-ft increments — or use dynamic altitude profiles to simulate climb, descent, or maneuvering conditions. Ideal for validating TCAS, GPWS/TAWS, and autopilot response, this feature brings flight realism to your test environment.
Who Is the ALT-9000 For?
- Avionics Technicians & Engineers
For validating, troubleshooting, and certifying installed altimeter systems. - Aircraft Maintenance Teams
Supporting return-to-service workflows and in-hangar diagnostics. - Flight Line Support Crews
Quick, portable testing during pre-flight or post-flight checks. - OEMs & System Integrators
To validate performance of LPI, CARA, and NG altimeters during production or development. - Military Maintenance Depots
For secure, self-contained test capability with support for advanced systems. - Aviation Training Centers
To simulate real-world altitude scenarios for technician and pilot training.
Tech Specs Overview
- Altitude Simulation Range: 5 ft* to 10,000 ft
(Extended to 16,000 ft or 25,000 ft with option) - Altitude Resolution: 5 ft increments
- Power Offset: +20 dB above nominal loop loss
- Display: Large color touchscreen
- Test Method: Direct-connect or antenna coupler
- Power: Battery-operated (portable)
- Software: Field upgradeable
VIAVI ALT-9000 Radio Altimeter Flight Line Test Documents
Physical Specifications
| Component | Dimensions (in) | Weight |
|---|---|---|
| Coupler | 7.5 x 7.5 x 7 | – |
| Single Carry Case | 10 x 9 x 9 | 6.5 lbs (3 kg) |
| Dual Carry Case | 16 x 9 x 12 | 9 lbs (4 kg) |
Case Scenarios
- Verify Radio Altimeter Installations Before Flight
- Diagnose and Isolate Faulty System Components (antenna, coax, LRU, indicator)
- Perform GPWS/TAWS and TCAS System Validation
- Support Aircraft Avionics Upgrades or Retrofit Programs
- Enable Safe, On-Ground Testing Without Expensive Flight Hours
- Validate System Response to Altitude Changes in Simulated Conditions
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