The Avair AV-400N is a commercial-grade radio frequency Standing Wave Ratio (SWR) and forward/reflected power meter engineered to deliver critical real-time transmission diagnostics for stationary base stations and vehicular communication installations. Operating seamlessly across a wide 140 to 525 MHz frequency spectrum, this high-precision instrument covers key VHF and UHF operational windows. It stands as an indispensable technical diagnostic utility asset for telecom maintenance teams, radio network engineers, broadcast infrastructure contractors, and high-volume B2B radiocommunication distribution networks requiring precise calibration equipment.
The internal metering architecture incorporates a highly responsive cross-needle display template designed to simultaneously track forward power, reflected power, and continuous SWR matching curves without separate calibration adjustments. Outfitted with a front-panel mechanical attenuation switch, the unit provides selectable power measurement ranges of 5 W, 20 W, 200 W, and 400 W, accommodating everything from low-power handheld transceivers with a minimum operational threshold of 0.5W up to heavy-duty mobile base station amplifiers. Internal power metrics are precisely scaled, yielding factory-calibrated accuracy profiles of 5% at 5 W, 7.5% at 20 W, 10% at 200 W, and a maximum threshold variance of 12.5% at 400 W to protect expensive power amplifier blocks from impedance mismatch damage.
Built for rigorous laboratory bench testing and intensive field service deployment, the hardware is housed in a rugged, fully shielded metal enclosure measuring 15 x 6.5 x 10 cm and weighing a solid 770 g. To minimize insertion loss and preserve absolute signal path integrity up to 525 MHz, the rear interface panel is equipped with low-loss, precision-machined Type-N female RF connection ports calibrated to a strict 50 Ohms characteristic nominal impedance. The display console features internal backlighting infrastructure powered via a standard 13.8 V DC external power input jack, ensuring complete visual scannability and fleet operational readiness during multi-shift testing environments.
Technical Specifications Matrix
| Technical Specification Parameter | Value & Fleet Alignment |
|---|---|
| Product Brand Manufacturer | Avair |
| Hardware Model Designation | AV-400N |
| Primary Component Classification | RF Standing Wave Ratio (SWR) and Power Meter |
| Tuned Operational Frequency Range | 140 – 525 MHz (VHF / UHF Spectrum Alignment) |
| Selectable Power Ranges | 5 Watts / 20 Watts / 200 Watts / 400 Watts |
| Minimum Power Input Threshold | 0.5 Watts |
| System Characteristic Impedance | 50 Ohms Nominal |
| Calibrated Metric Accuracy Profile | 5% @ 5W | 7.5% @ 20W | 10% @ 200W | 12.5% @ 400W Max Variance |
| Primary RF Interface Ports | Type-N Female Connector Infrastructure |
| Console Backlight Voltage Supply | 13.8 Volts DC Input Terminal |
| Physical Size Dimensions | 150 mm (Width) x 65 mm (Height) x 100 mm (Depth) |
| Net Unit Weight | 770 grams |
