Professional VHF/UHF RF Instrumentation & Diagnostic Infrastructure
The Avair AV-400 is a commercial-grade, inline SWR (Standing Wave Ratio) and RF power meter engineered to provide precise transmission line diagnostics and output tracking for professional VHF and UHF radio systems. Operating across an expansive 140 MHz to 525 MHz frequency spectrum, this high-precision instrumentation instrument allows radio bench technicians, telecommunication field contractors, and network engineers to monitor real-time transmitter efficiency and structural antenna matching. It serves as an essential physical infrastructure asset for corporate maintenance facilities, multi-frequency repeater station monitoring, and specialized B2B radio accessory distribution channels across Europe.
The technical framework features a multi-tiered, selectable power range switch configured to scale measuring limits across 5W, 20W, 200W, and 400W maximum thresholds. This flexible range setup allows for high-resolution testing of both low-power portable transceivers and high-power base stations down to a minimum forward power detection limit of just 0.5 Watts. Engineered to minimize baseline signal attenuation, the internal stripline circuit maintains a strict 50-Ohm nominal system impedance profile, protecting sensitive transmitter power amplifiers from insertion stress during inline integration. The cross-needle display subsystem delivers immediate, simultaneous telemetry for forward power, reflected power, and standing wave balance, allowing for rapid diagnostics under high-rotation fleet service duties.
Built inside a fully shielded mechanical housing to eliminate external electromagnetic interference (EMI) and preserve measurement integrity, the unit comes equipped with industry-standard SO-239 (UHF Female) bulkhead connection interfaces. For permanent workbench integration, the meter incorporates a rear 13.8 VDC secondary power port designed to drive the large internal illumination panel, ensuring clear instrumentation visibility in dimly lit engineering environments or remote telecom enclosures.
Verified Technical Specifications Matrix
| Technical Specification Parameter | Verified Manufacturer Value |
|---|---|
| Product Brand Manufacturer | Avair |
| Hardware Model Designation | AV-400 |
| Primary Component Classification | RF SWR and Power Meter (Wattmeter) |
| Operational Frequency Coverage | 140 MHz to 525 MHz (VHF / UHF Bands) |
| Selectable Power Measurement Scales | 5 Watts / 20 Watts / 200 Watts / 400 Watts |
| Minimum Required Input Power | 0.5 Watts (For accurate SWR detection baseline) |
| Calibrated Calibration Accuracy | 5% (at 5W Scale range) 7.5% (at 20W Scale range) 10% (at 200W Scale range) 12.5% (at 400W Scale range) |
| System Nominal Impedance | 50 Ohms (Standard RF Transmission Calibration) |
| In/Out Structural RF Connectors | PL Type / SO-239 Female Bulkhead Ports |
| Internal Illumination Power Requirement | 13.8 VDC (External lead connection) |
| Chassis Physical Dimensions | 15 cm (Width) x 6.5 cm (Height) x 10 cm (Depth) |
| Net Equipment Weight | 770 grams |
