# Agilent N9912A FieldFox 4/6 GHz Handheld RF Analyzer (Pre-Owned) # Agilent N9912A FieldFox 4/6 GHz Handheld RF Analyzer (Pre-Owned) ## Key Features At A Glance - Frequency coverage from 2 MHz to 4 GHz (Option 104) or 2 MHz to 6 GHz (Option 106) in a handheld form factor - QuickCal built-in calibration system enables field calibration without carrying a separate calibration kit - CalReady at the RF Out port — instrument is calibrated and ready to make accurate measurements immediately after power-on or preset - Integrated cable and antenna analyzer with return loss, VSWR, distance-to-fault, and one-port cable loss measurements - Optional built-in spectrum analyzer (100 kHz to 4 GHz or 6 GHz) with displayed average noise level to -148 dBm typical (with optional preamplifier) - Optional transmission measurement (Option 110) provides up to 72 dB typical dynamic range from 2 MHz to 2 GHz - Optional USB power sensor support (Option 302) for true average RF/microwave power measurements up to 24 GHz - Rugged, water-resistant chassis meets MIL-PRF-28800F Class 2 with -10 °C to +55 °C operating range and 4-hour battery operation 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. ## Brand Heritage 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. ## Accessories Supplied - AC/DC adapter - Battery - Soft carrying case with backpack and shoulder straps - Quick Reference Guide - CD ROM with FieldFox Data Link software and full manual ## Product Core & Specifications 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 **Important:** Maximum input level at the RF Out port: +23 dBm. Maximum input power at the RF In port: +27 dBm (0.5 W). Maximum DC voltage at either RF port: ±50 VDC.**Important:** The N9912A base unit ships with no frequency-range capability enabled; either Option 104 (4 GHz) or Option 106 (6 GHz) Cable and Antenna Analyzer must be ordered to make measurements. Spectrum analyzer functionality requires Option 230 or 231, and these require Option 104 or 106 respectively.**Important:** S21 transmission measurement (Option 303 Network Analysis) requires Option 110 Transmission Measurement to be installed.**Important:** Preamplifier (Option 235) requires Option 230 or 231 spectrum analyzer to be installed.**Important:** Power Meter (Option 302) requires an Agilent U2000 Series USB power sensor (sold separately) to make RF/microwave power measurements.Recommended pairing: for true average RF power measurements up to 24 GHz, the N9912A (with Option 302) is designed to connect with Agilent U2000 Series USB power sensors as identified on the datasheet. ## About this used unit - Warranty included - Functional verification included - Standard Calibration Upgrade Options: No Calibration Required, NIST Traceable, Z540.1 or ISO 17025 with Data, Z540.3 Guardbanding with Data. - Note that unnecessary accessories may not be included (contact Test Architect to confirm). **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.** ## Details - **Price:** 0.0 USD - 600.0 USD - **Vendor:** Agilent - **Type:** Spec An - **Tags:** Agilent, Agilent Keysight, Analyzers, Cable and Antenna, Manufacturers, product_manual_group_1, Product_used ## Variants | Variant | Price | Available | |---------|-------|-----------| | None | 0.00 USD | In stock | | NIST Traceable | 525.00 USD | In stock | | NIST Traceable with Full Data | 562.50 USD | In stock | | ISO IEC 17025 Accredited | 600.00 USD | In stock | ## Images - Agilent N9912A FieldFox 4/6 GHz Handheld RF Analyzer (Pre-Owned) --- > Source: [ValueTronics](https://valuetronics.com/products/n9912a-agilent-cable-and-antenna-analyzer-used) > Updated: 2026-05-30