# Keysight N9961A FieldFox 44 GHz Handheld Microwave Spectrum Analyzer # Keysight N9961A FieldFox 44 GHz Handheld Microwave Spectrum Analyzer ## Key Features At A Glance - Frequency coverage from 30 kHz to 50 GHz across the FieldFox family, with model-specific ranges spanning 4, 6.5, 9, 14, 18, 26.5, 32, 44, and 50 GHz options - Combination analyzers integrate Cable and Antenna Test (CAT), Vector Network Analyzer (VNA), and Spectrum Analyzer functions in a single handheld - Three calibration tiers (CalReady, QuickCal, and Standard) provide flexibility from quick verification through full S-parameter accuracy - MIL-PRF-28800F Class 2 ruggedization with IP53 ingress protection per IEC/EN 60529 for field deployment - Frequency reference accuracy of ±0.7 ppm standard, improving to ±0.010 ppm when locked to GPS (with built-in GPS receiver option) - Lithium-ion battery operation of approximately 3.5 hours typical, with operating temperature range of -10 to 55°C (AC powered) - Optional capabilities (license-required) include Real-Time Spectrum Analyzer, I/Q Analyzer, Noise Figure, Extended Range Transmission Analysis, and 89600 VSA software support - LAN, USB, and SCPI programming interfaces standard; iOS remote control available with Option 030 The Keysight FieldFox Handheld Analyzers are portable RF and microwave test instruments engineered for field measurement work where laboratory-grade performance is required outside the lab. The FieldFox family spans nine frequency ceilings from 4 GHz through 50 GHz, with three primary product lines: combination analyzers (N991xA, N995xA series) that integrate Cable and Antenna Test, Vector Network Analyzer, and Spectrum Analyzer functions; dedicated microwave VNAs (N992xA series); and dedicated microwave spectrum analyzers (N993xA, N996xA series). All FieldFox units share a common platform with a 6.5-inch transflective color LCD-LED backlit display sized for outdoor visibility. FieldFox analyzers are used for cable and antenna testing including distance-to-fault measurements, return loss, and VSWR characterization on transmission lines; vector network analysis with full S-parameter measurement (S11, S21, S22, S12) on RF components; spectrum analysis from 9 kHz (on N995xA/N996xA models) or 100 kHz (on N991xA/N993xA models) through the instrument's maximum frequency; and a range of specialized measurements available through licensed options including real-time spectrum analysis, I/Q analysis, noise figure characterization, vector voltmeter operation, pulse measurements with external USB power sensors, and Over-the-Air cellular measurements (LTE FDD, 5GTF). ## Brand Heritage The FieldFox product line is a Keysight Technologies platform. Keysight's test and measurement business traces its lineage to Hewlett-Packard's instrument division, which was spun off as Agilent Technologies in 1999, with the electronic measurement business subsequently separated as Keysight Technologies in 2014. FieldFox analyzers reflect this engineering heritage in their calibration architecture, which is based on the same calibration engine used in Keysight's PNA family of bench network analyzers. ## Compare Other Models in This Series The FieldFox family is organized into three product groupings sharing a common handheld platform. The N991xA combination analyzers (N9913A through N9918A) cover 30 kHz to frequency ceilings of 4, 6.5, 9, 14, 18, and 26.5 GHz, integrating Cable and Antenna Test, Vector Network Analyzer, and Spectrum Analyzer functions in a single unit. The N995xA combination analyzers (N9950A, N9951A, N9952A) extend the same combination architecture upward to 32, 44, and 50 GHz with a starting frequency of 300 kHz (CAT/VNA) or 9 kHz (Spectrum Analyzer). Two specialized product lines address users whose application is dedicated to a single measurement domain. The N992xA microwave VNAs (N9925A through N9928A) are dedicated vector network analyzers covering 30 kHz through 9, 14, 18, and 26.5 GHz. The N993xA microwave spectrum analyzers (N9935A through N9938A) and N996xA microwave spectrum analyzers (N9960A, N9961A, N9962A) are dedicated spectrum analyzers covering the same frequency tiers as their combination-analyzer counterparts. Each model below is its own dedicated product page with new-matched pricing. Because FieldFox capability is option-dependent, confirm the model number and the installed option string against the measurement requirement; ValueTronics documents both on every unit we offer. The primary family differences are frequency ceiling and measurement function set. Combination analyzer models (N991xA, N995xA) support CAT, VNA, and Spectrum Analyzer measurements on a single unit, making them suitable for users who need multiple measurement domains in one instrument. Dedicated VNA models (N992xA) and dedicated Spectrum Analyzer models (N993xA, N996xA) are configured for users whose application is focused on a single measurement type. Frequency ceiling steps the price tier across the family. Within the combination analyzer line, the N9913A (4 GHz) through N9918A (26.5 GHz) cover the cellular, WiFi, and lower microwave bands; the N9950A through N9952A extend coverage through 50 GHz for millimeter-wave-adjacent applications. The N995xA models also offer broader spectrum analyzer measurement range, with a 9 kHz starting frequency versus 100 kHz on the N991xA. Refer to the comparison table that follows for specific frequency ranges and key spec differences across the family. Model Frequency Range Analyzer Type Test Port Connector **N9961A** 9 kHz to 44 GHz Microwave Spectrum Analyzer NMD 2.4 mm (m) N9913A 30 kHz to 4 GHz (CAT/VNA), 100 kHz to 4 GHz (SA) RF Combination (CAT + VNA + SA optional) Type-N (f) N9914A 30 kHz to 6.5 GHz (CAT/VNA), 100 kHz to 6.5 GHz (SA) RF Combination (CAT + VNA + SA optional) Type-N (f) N9915A 30 kHz to 9 GHz (CAT/VNA), 100 kHz to 9 GHz (SA) Microwave Combination (CAT + VNA + SA optional) Type-N (f) Additional differences in specifications beyond the few shown above are not listed here — see each model's full specifications below. ## Product Core & Specifications Category Specification Value General Calibration cycle 1 year General Display 6.5" transflective color LCD-LED backlit Weight (N991xA, N992xA, N993xA) Including battery 3.0 kg (6.6 lb) Weight (N995xA, N996xA) Including battery 3.2 kg (7.1 lb) Dimensions H x W x D 292 x 188 x 72 mm (11.5 in x 7.4 in x 2.8 in) Environmental Operating temperature, AC power, spec \-10 to 55°C (14 to 131°F) (-10 to 45°C in RTSA mode) Environmental Operating temperature, battery, spec \-10 to 50°C (14 to 122°F) Environmental Storage temperature, spec \-51 to 71°C (-60 to 160°F) Environmental Maximum humidity (non-condensing) 95% relative humidity up to 40°C, decreasing linearly to 45% at 55°C Environmental Altitude operating (battery) 9,144 m (30,000 ft) Environmental Altitude non-operating 15,240 m (50,000 ft) Environmental Ingress protection IP53 per IEC/EN 60529 Environmental Compliance MIL-PRF-28800F Class 2; MIL-STD-810G Method 511.5 Procedure I (explosive environment) Power supply External DC input 15 to 19 VDC, 40 W max when battery charging Power supply External AC adapter 100-250 VAC, 50-60 Hz, 1.25 to 0.56 A; Output 15 VDC, 4 A Power supply Power consumption 14 W typical, mode dependent Battery Type Lithium ion, 10.8 V, 4.6 A-h Battery Operating time 3.5 hours (typical), mode dependent Battery Charge time 1.5 hours to 80%; 4 hours to 100% Test port connectors ≤ 18 GHz models Type-N (f) Test port connectors 26.5 GHz models (N9918A, N9928A) 3.5 mm (m) Test port connectors 26.5 GHz N9938A 3.5 mm (m) or Type-N (f) Test port connectors ≥ 32 GHz models NMD 2.4 mm (m), torque 0.9 Nm or 8 in-lb Connectivity USB-A 2 ports, Hi-speed USB 2.0 Connectivity Mini USB 1 port, Hi-speed USB 2.0; SCPI programming (USBTMC) Connectivity LAN (N991xA, N992xA, N993xA) RJ-45, 100/10 base-T auto-switching Connectivity LAN (N995xA, N996xA) RJ-45, 1000/100/10 base-T auto-switching Connectivity Headphone jack 3.5 mm (1/8 in) miniature audio jack Reference out / Trigger out Connector SMB (m), 50 Ω Reference out / Trigger out Output amplitude ≥ 0 dBm Reference out / Trigger out Frequency 10 MHz Reference in / Trigger in Connector SMA (f), 50 Ω Reference in / Trigger in Reference input 10 MHz, -5 to +10 dBm Reference in / Trigger in Trigger input 3.3 or 5 V TTL logic levels Data storage Internal 4 GB minimum; 1000 states/traces minimum Data storage External USB 2.0 memory devices and SD/SDHC memory cards Languages Supported English, Spanish, German, Italian, French, Russian, Japanese, Chinese, Turkish, Korean, Portuguese Programming SCPI via built-in LAN interface, BenchVue **Important:** Many FieldFox capabilities require specific software options. Combination analyzer functions (CAT + VNA + Spectrum Analyzer) are not all present on every model variant; confirm the installed option string against the application requirement before ordering.**Important:** FieldFox must be within its calibration cycle for all listed specifications, typical, and nominal values to apply.**Important:** Many capabilities listed in this data sheet require options. Refer to the FieldFox Configuration Guide for option/measurement capability information.**Important:** For combination analyzers (N991xA, N995xA), spectrum analyzer functionality requires Option 233. CAT and VNA capabilities also require specific options (e.g., Option 210 for T/R, Option 211 for full 2-port S-parameters).**Important:** Test port connector type varies by model and frequency: Type-N (f) for ≤18 GHz models; 3.5 mm (m) for 26.5 GHz N9918A/N9928A and optionally N9938A; NMD 2.4 mm (m) for ≥32 GHz models. The N9910X-886 torque wrench (0.9 Nm / 8 in-lb) is required for the NMD 2.4 mm ports.**Important:** Built-in GPS receiver (Option 307) requires an external GPS antenna; the N9910X-825 GPS active antenna can be used.**Important:** Noise figure measurements with Option 356 may require an external preamplifier (U7227A/C/F or U7228A/C/F) and a noise source (e.g., 346A/B/C, 346CK40, 346CK01); DC bias for the noise source requires accessory N9910X-713 BNC to SMB cable.**Important:** External USB power sensors used with Option 302, 330, or 208 are not included; for an up-to-date list of supported power sensors, visit http://www.keysight.com/find/fieldfoxsupport.**Important:** ERTA (Option 209) requires two FieldFox units (one as source/reference receiver, one as measurement receiver) plus a power splitter (e.g., Keysight 11667A/B/C) and is not a single-unit measurement.**Important:** Remote control via Option 030 requires a user-supplied iOS device (iPad, iPhone, or iPod Touch with iOS 6.1 or higher) and a network connection; not applicable to Android, BlackBerry, or Windows phone/tablet devices.**Important:** Battery life is reduced when the DC Bias Variable-Voltage Source (Option 309) is in use. A trip function turns off the power supply when the rated current (0.65 A) or power (7 W) is exceeded.**Important:** Some performance specifications (faster sweep times, faster trace updates, extended low-frequency DANL) apply only to FieldFox units with serial number prefix ≥ MY5607/SG5607/US5607, or units that have been upgraded with the fast CPU Option N9910HU-100/200/300/400.Recommended pairing: for extended-range transmission measurements over long cable runs, the Extended Range Transmission Analysis (ERTA, Option 209) feature requires two FieldFox units operating together as paired source and measurement receiver, synchronized via LAN and hardware triggering as described in the FieldFox documentation. **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:** 59489.0 USD - **Vendor:** Keysight - **Type:** Spec An - **Tags:** Analyzers, Keysight, Keysight Technologies, Manufacturers, product_manual_group_3, Product_new, Spectrum ## Variants | Variant | Price | Available | |---------|-------|-----------| | Default Title | 59489.00 USD | In stock | ## Images - N9961A Keysight Technologies Spectrum Analyzer --- > Source: [ValueTronics](https://valuetronics.com/products/n9961a-keysight-spectrum-analyzer-new) > Updated: 2026-05-30