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The Agilent FieldFox N9912A is a handheld RF analyzer designed to consolidate multiple field measurement functions into a single portable instrument. Available in 4 GHz (Option 104) and 6 GHz (Option 106) configurations, the N9912A integrates cable and antenna testing, spectrum analysis, vector network analysis, power measurement, and vector voltmeter capability in a ruggedized, battery-powered form factor intended for field deployment.
The N9912A is built for wireless infrastructure field work, including cell site cable and antenna testing, interference hunting, transmitter verification, and component characterization. Applications cited on the datasheet include return loss and distance-to-fault testing on feed lines and antennas, insertion loss measurement on filters and amplifiers, one-port cable loss verification, intermittent interference detection using the built-in spectrum analyzer, and electrical-length matching of phase-matched cables using the vector voltmeter function. The analyzer addresses scenarios such as VOR/ILS radio navigation verification and isolation testing on 2-port components.
Agilent Technologies was spun off from Hewlett-Packard in 1999 as HP's test and measurement business. In 2014, Agilent split again, with the electronic measurement business becoming Keysight Technologies. Instruments originally branded Agilent — including the FieldFox N9912A — are part of the lineage now supported by Keysight.
| Specification | Value |
|---|---|
| Cable and Antenna Analyzer (Option 104 or 106) | |
| Frequency range (Option 104) | 2 MHz to 4 GHz |
| Frequency range (Option 106) | 2 MHz to 6 GHz |
| Frequency reference accuracy | ±2 ppm |
| Aging rate | ±1 ppm/yr |
| Temperature stability | ±1 ppm over -10 to 55 °C |
| Frequency resolution (2 MHz to 1.6 GHz) | 2.5 kHz |
| Frequency resolution (>1.6 GHz to 3.2 GHz) | 5 kHz |
| Frequency resolution (>3.2 GHz to 6 GHz) | 10 kHz |
| Measurement speed (Return loss) | 1.5 ms/point (nominal), 1.75 GHz to 3.85 GHz, 1001 points, Cal ON |
| Measurement speed (Distance to fault) | 2.4 ms/point (nominal), 0 to 500 ft, 601 points, Cal ON |
| Data points | 101, 201, 401, 601, 801, 1001 |
| Directivity (Corrected) | > 42 dB |
| Directivity (QuickCal, Option 111) | > 42 dB (typical) |
| Source match (Corrected) | > 36 dB |
| Source match (QuickCal, Option 111) | ≥ 35 dB (typical) |
| Reflection tracking (Corrected) | ±0.06 dB |
| Reflection tracking (QuickCal, Option 111) | ±0.15 dB (typical) |
| Dynamic range, Reflection (2 MHz to 4 GHz) | 60 dB (typical) |
| Dynamic range, Reflection (>4 GHz to 6 GHz) | 55 dB (typical) |
| Dynamic range, Transmission (2 MHz to 2 GHz) | 72 dB (typical) |
| Dynamic range, Transmission (>2 GHz to 3 GHz) | 67 dB (typical) |
| Dynamic range, Transmission (>3 GHz to 5 GHz) | 58 dB (typical) |
| Dynamic range, Transmission (>5 GHz to 6 GHz) | 49 dB (typical) |
| Output power, High (2 MHz to 4 GHz) | < +8 dBm, +6 dBm (nominal) |
| Output power, High (>4 GHz to 6 GHz) | < +7 dBm, +2 dBm (nominal) |
| Output power, Low (2 MHz to 4 GHz) | < -23 dBm, -25 dBm (nominal) |
| Output power, Low (>4 GHz to 6 GHz) | < -24 dBm, -25 dBm (nominal) |
| Immunity to interference | +16 dBm (nominal) |
| Maximum input level (RF Out port) | +23 dBm |
| Maximum input DC voltage (RF Out port) | ±50 VDC |
| Return loss display range | 0 to 100 dB |
| Return loss resolution | 0.01 dB |
| VSWR display range | 0 to 100 |
| VSWR resolution | 0.01 |
| Network Analysis (Option 303) | |
| Measurements | S11 (magnitude and phase), S21 magnitude (requires Option 110), A (reflected power), R (source power) |
| Display formats | Log, linear, phase, VSWR, Smith chart |
| Calibration types | Mechanical cal, QuickCal, Normalization, Automatic cal update |
| IF bandwidth selections | 300 Hz, 1 kHz, 3 kHz, 10 kHz, 30 kHz |
| Spectrum Analyzer (Option 230 or 231) | |
| Frequency range (Option 230) | 100 kHz to 4 GHz, usable to 5 kHz |
| Frequency range (Option 231) | 100 kHz to 6 GHz, usable to 5 kHz, tunable to 6.1 GHz |
| Frequency reference accuracy | ±2 ppm |
| Frequency aging | ±1 ppm/yr |
| Frequency reference temperature stability | ±1 ppm over -10 to 55 °C |
| Frequency span range | 0 Hz (zero span), 10 Hz to maximum frequency |
| Span resolution | 1 Hz |
| RBW range (zero span) | 300 Hz to 1 MHz in 1-3-10 sequence; 2 MHz |
| RBW range (non-zero span) | 10 Hz to 300 kHz in 1/1.5/2/3/5/7.5/10 sequence; 1 MHz, 2 MHz |
| RBW selectivity (-60 dB / -3 dB) | 4:1 (nominal) |
| Video bandwidth (VBW) range | 1 Hz to 2 MHz in 1/1.5/2/3/5/7.5/10 sequence |
| Noise sidebands (CF = 1 GHz, 10 kHz offset) | -88 dBc/Hz (typical) |
| Noise sidebands (30 kHz offset) | -89 dBc/Hz (typical) |
| Noise sidebands (100 kHz offset) | -95 dBc/Hz (typical) |
| Noise sidebands (1 MHz offset) | -115 dBc/Hz (typical) |
| Trace points | 101, 201, 401, 601, 801, 1001 (default 401) |
| Measurement range | DANL to +20 dBm |
| Input attenuator range | 0 to 31 dB, 1 dB steps |
| Maximum DC voltage at RF In port | ±50 VDC |
| Maximum input power at RF In port | +27 dBm (0.5 W) |
| DANL, Preamp OFF (10 MHz to 2.4 GHz, 20 to 30 °C) | -130 dBm (typical) |
| DANL, Preamp OFF (>2.4 to 5.0 GHz) | -125 dBm (typical) |
| DANL, Preamp OFF (>5.0 to 6.0 GHz) | -119 dBm (typical) |
| DANL, Preamp ON Option 235 (10 MHz to 2.4 GHz, 20 to 30 °C) | -148 dBm (typical) |
| DANL, Preamp ON (>2.4 to 5.0 GHz) | -145 dBm (typical) |
| DANL, Preamp ON (>5.0 to 6.0 GHz) | -138 dBm (typical) |
| Third order intermodulation distortion (TOI) | < -96 dBc, +18 dBm TOI (nominal) |
| Preamplifier gain (Option 235) | 22 dB (nominal) |
| Reference level range | -170 dBm to +30 dBm |
| Reference level resolution | 0.1 dB |
| Traces | 4 traces, data/max/average/min |
| Detectors | Normal, positive peak, negative peak, sample, average |
| Marker types | Normal, noise marker |
| Number of markers / delta markers | 6 |
| RF In VSWR | 1.5:1 (50 ohm) |
| Power Meter Measurement (Option 302) | |
| Frequency range | 9 kHz to 24 GHz (sensor dependent) |
| USB power sensor | 9 kHz to 24 GHz (Agilent U2000 Series) |
| General Specifications | |
| Connector type | Type-N (female) |
| Input impedance | 50 ohm |
| External reference input | BNC female, 10 MHz, -5 dBm to 10 dBm |
| Display | 6.5″ transflective, color VGA LED backlit 640 x 480 with anti-glare coating |
| Speaker | Built-in speaker |
| Headphone jack | Built-in headphone jack |
| Connectivity | 2 x USB 2.0; 1 x mini USB; 1 x LAN |
| Internal storage | Minimum 16 MB, up to 1000 traces |
| External storage | 1 x mini SD slot and 2 x USB 2.0 |
| EMC | Complies with European EMC Directive 2004/108/EC; IEC/EN 61326-2-1; CISPR Pub 11 Group 1, Class A; AS/NZS CISPR 11; ICES/NMB-001 |
| ESD | IEC/EN 61000-4-2, functional up to 20 kV test |
Please review the Manufacturer's Data Sheet to verify published specifications. Feedback on this webpage is always welcome — please reach out to your Test Architect at any time for questions or concerns. Thank you, we truly appreciate you being our customer.
Model No
Agilent
Condition
Used
Manufacturer
Agilent
Frequency
Frequency
Frequency
6 GHz
["10
VNA time domain
30
Remote control capability
104
4 GHz RF vector network analyzer
transmission/reflection
110
Transmission measurement
111
QuickCal
210
VNA transmission/reflection
211
VNA full 2-port S-parameters
215
TDR CABLE MEASUREMENTS
230
Spectrum analyzer
231
6 GHz spectrum analyzer (requires Option 106)
233
Spectrum analyzer
235
Preampliier for spectrum analyzer (requires Option 230 or 231)
236
Interference analyzer and spectrogram
238
Spectrum analyzer time gating
302
External USB power sensor support
303
Network analysis capability
305
Cable and antenna analyzer
307
GPS receiver
308
Vector voltmeter
309
DC bias variable-voltage source
310
Built-in power meter
350
REAL-TIME SPECTRUM ANALYZER (RTSA)"]
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