The Keysight N9928A FieldFox is a handheld microwave vector network analyzer operating from 30 kHz to 26.5 GHz. It provides high benchtop-level accuracy in a rugged, portable form factor, designed to withstand harsh field environments. Featuring a 4-receiver architecture, it supports a wide variety of calibrations and capabilities including full 2-port S-parameter measurements, time domain analysis, distance-to-fault measurements, and integrated power monitoring.
Specifications
General
| Parameter | Value |
|---|---|
| Interfaces | LAN, USB Host (2 ports), USB Device (Mini-B), External Reference Input (BNC), External Trigger (BNC), MicroSD slot, Headphone jack, GPS antenna (SMA) |
| Display | 6.5-inch transflective color LCD, 640 x 480 resolution |
| Kensington Lock Slot | Standard Kensington lock slot |
Physical
| Parameter | Value |
|---|---|
| Operating Temperature | -10 to 55 °C |
| Dimensions (W×H×D) | 292 x 188 x 72 mm |
| Weight | 3.0 kg (with battery) |
Frequency & Stimulus Specifications
| Parameter | Value |
|---|---|
| Frequency Range | 30 kHz to 26.5 GHz |
| Frequency Resolution | 1 Hz |
| Frequency Aging Rate | ±1 ppm/year |
| Number of Test Ports | 2 |
| Test Port Impedance | 50 Ω (nominal), 75 Ω (with appropriate adapter/cal kit) |
| Output Power Resolution / Step Size | 1 dB |
| Output Power Range | High, low, and manual (Low power is -45 dBm nominal) |
| Test Port Output Power (30 kHz to 300 kHz) | -11 dBm (typical) |
| Test Port Output Power (>300 kHz to 2 MHz) | -3 dBm (typical) |
| Test Port Output Power (>2 MHz to 625 MHz) | -2 dBm (typical) |
| Test Port Output Power (>625 MHz to 3 GHz) | +1 dBm (typical) |
| Test Port Output Power (3 to 6.5 GHz) | -1 dBm (typical) |
| Test Port Output Power (6.5 to 9 GHz) | -2 dBm (typical) |
| Test Port Output Power (9 to 14 GHz) | -4 dBm (typical) |
| Test Port Output Power (14 to 18 GHz) | -6 dBm (typical) |
| Test Port Output Power (18 to 23 GHz) | -10 dBm (typical) |
| Test Port Output Power (23 to 26.5 GHz) | -12 dBm (typical) |
Receiver & Dynamic Range Specifications
| Parameter | Value |
|---|---|
| System Dynamic Range (>300 kHz to 9 GHz) | 100 dB (typical, 300 Hz IFBW) |
| System Dynamic Range (9 to 14 GHz) | 97 dB (typical, 300 Hz IFBW) |
| System Dynamic Range (14 to 18 GHz) | 94 dB (typical, 300 Hz IFBW) |
| System Dynamic Range (18 to 20 GHz) | 90 dB (typical, 300 Hz IFBW) |
| System Dynamic Range (20 to 25 GHz) | 79 dB (typical, 300 Hz IFBW) |
| System Dynamic Range (25 to 26.5 GHz) | 70 dB (typical, 300 Hz IFBW) |
| Trace Noise Magnitude (>300 kHz to 10 GHz) | ±0.002 dB rms (300 Hz IFBW) |
| Trace Noise Phase (>300 kHz to 10 GHz) | ±0.014 degrees rms (300 Hz IFBW) |
| Trace Noise Magnitude (10 to 20 GHz) | ±0.004 dB rms (300 Hz IFBW) |
| Trace Noise Phase (10 to 20 GHz) | ±0.027 degrees rms (300 Hz IFBW) |
| Trace Noise Magnitude (20 to 26.5 GHz) | ±0.010 dB rms (300 Hz IFBW) |
| Trace Noise Phase (20 to 26.5 GHz) | ±0.066 degrees rms (300 Hz IFBW) |
| Maximum RF Input Damage Level | +27 dBm |
| Maximum DC Input Damage Level | ±40 VDC |
Measurement Speed & Settings
| Parameter | Value |
|---|---|
| IF Bandwidths | 10 Hz, 30 Hz, 100 Hz, 300 Hz, 1 kHz, 3 kHz, 10 kHz, 30 kHz, 100 kHz |
| Number of Measurement Points | 101, 201, 401, 601, 801, 1001, 1601, 4001, 10001 (arbitrary points settable through SCPI) |
Measurement Capabilities & Calibration
| Parameter | Value |
|---|---|
| Measured Parameters (T/R) | S11, S21 |
| Measured Parameters (Full 2-Port) | S11, S21, S22, S12 (requires Option 211) |
| Calibration Types | CalReady, 1-port QuickCal, 1-port SOL, 1-port Frequency Response, Enhanced Response, 2-port QuickCal, 2-port SOLT/Offset Short, 2-port SOLT, 2-port Unknown Thru |
| Supported Calibration Kits | Type-N 50 Ω, Type-N 75 Ω, 7/16, TNC, 3.5 mm, 2.4 mm, Waveguide (WR-90, WR-62, WR-42), custom coaxial/waveguide |
| Time Domain Option | Supported (Option 010; includes gating) |
| Cable and Antenna Analyzer Option | Supported (Option 305; Distance-to-fault, return loss, cable loss) |
| Vector Voltmeter (VVM) Option | Supported (Option 308) |
| Built-in Power Meter Option | Supported (Option 310) |
| Built-in GPS Receiver Option | Supported (Option 307) |
Hardware Interfaces & Connections
| Parameter | Value |
|---|---|
| Test Port Connector Type | 3.5 mm male (50 Ω nominal) |
| External Reference Input Frequency | 10 MHz |
| External Reference Input Level | -3 to +10 dBm |
| External Trigger Input/Output | BNC female, TTL compatible |
| USB Ports | 2 x USB 2.0 Host, 1 x Mini-USB Device (Type-B) |
| LAN Interface | 100Base-T (RJ-45) |
| GPS Antenna Input | SMA female |
System, Controller & Storage
| Parameter | Value |
|---|---|
| Data Storage Formats | .s1p, .s2p, .csv, .txt, .png, .state |
| Remote Control Language | SCPI |
| Storage Media | Internal Flash, SD card, or USB Flash Drive |
Physical, Environmental & Power
| Parameter | Value |
|---|---|
| Storage Temperature Range | -51 °C to 71 °C (without battery) |
| Environmental Resistance | Meets MIL-PRF-28800F Class 2 requirements |
| Ingress Protection Rating | IP53 |
| Battery Life | 4 hours (typical) |
| Battery Charging Time | 4 hours (typical, analyzer off) |
| Warranty | 3-year standard |
Performance
| Parameter | Value |
|---|---|
| Sweep Speed (201 Points, 1-Port Cal) | 210 ms (100 kHz IFBW) |
| Sweep Speed (201 Points, 2-Port Cal) | 400 ms (100 kHz IFBW) |
Inputs & Outputs
| Parameter | Value |
|---|---|
| External Reference Output Frequency | 10 MHz |
| External Reference Output Level | 0 to 10 dBm (nominal) |
| Headphone Jack | 3.5 mm miniature jack |
| SD Card Slot | Supports SD/SDHC card (up to 16 GB) |
| Internal Speaker | Built-in speaker |
Power
| Parameter | Value |
|---|---|
| Battery Type | 10.8 V, 4.6 Ah, 50 Wh Lithium-Ion |
| AC/DC Adapter Output | 15 VDC, 4.0 A |
| Power Consumption (Typical) | 14 W (battery charging off) |
| External DC Input | 15 to 19 VDC, 4 A |
Environmental
| Parameter | Value |
|---|---|
| Maximum Operating Altitude | 9,144 m (30,000 ft) |
| Maximum Non-Operating Altitude | 15,240 m (50,000 ft) |
| Operating Humidity | 95% relative humidity at 40 °C (non-condensing) |
| Battery Charging Temperature Range | 0 to 45 °C |
Compliance & Standards
| Parameter | Value |
|---|---|
| Vibration Standard | Meets MIL-PRF-28800F Class 2, MIL-STD-810G, Method 514.6, Procedure I |
| Explosive Atmosphere Standard | MIL-STD-810G, Method 511.5, Procedure I |
Options
| Parameter | Value |
|---|---|
| USB Power Sensor Support (Option 302) | Enables connection to Keysight USB power sensors |
| Remote Control Capability (Option 030) | Enables remote control via LAN using SCPI or FieldFox iOS application |
Measurement Capabilities
| Parameter | Value |
|---|---|
| Group Delay Aperture | 0.25% to 20% of span |
| Mixed-Mode S-Parameters (Option 212) | Supported |
| TDR Cable Measurements (Option 330) | Supported |
Compliance
| Parameter | Value |
|---|---|
| EMC Standard Compliance | IEC/EN 61326-1, CISPR 11 Class A, Group 1 |
| Safety Standard Compliance | IEC/EN 61010-1 |
Calibration
| Parameter | Value |
|---|---|
| QuickCal (Option 112) | Supported |
Display
| Parameter | Value |
|---|---|
| Display Size | 6.5 in (165 mm) diagonal |
| Display Resolution | 640 x 480 VGA |
Technology
Vector Network Analysis (VNA)
Applications
Microwave antenna, cable, and transmitter/receiver installation, maintenance, and troubleshooting in industrial, aerospace, defense, and field environments.