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The Anritsu Site Master S311D/S312D is a portable, multi-function field instrument designed for testing and troubleshooting RF systems in the field. The S311D provides cable and antenna analysis from 25 MHz to 1600 MHz (extendable to 2 MHz with Option 2), while the S312D adds a fully functional spectrum analyzer covering 100 kHz to 1600 MHz. Both models combine accuracy, portability, and ruggedness in a handheld form factor weighing less than 5 lbs with a rechargeable NiMH battery.
The Site Master is positioned for Land Mobile Radio (LMR) and Public Safety system technicians testing RF performance of P25 and TETRA radios in the VHF/UHF, 700 MHz, and 800 MHz bands. With its 2 MHz frequency coverage option, the Site Master also serves defense applications in the HF band, as well as broadcast and cellular installations. The cable and antenna analyzer sweeps cables and antennas using Return Loss and VSWR measurements, while the Distance-To-Fault (DTF) measurement pinpoints poor connections, contamination, damaged cables, water penetration, and bad antennas before they cause major failures.
At ValueTronics, every Site Master S311D and S312D is inspected, tested, and supported from our 20,000 sq ft secure warehouse at 1675 Cambridge Drive in Elgin, Illinois. Our in-house technicians verify cable and antenna analyzer performance, spectrum analyzer noise floor, and installed option functionality before shipment, so field crews and procurement teams know exactly what is in the box. This hands-on verification is what separates a working tower-test instrument from an unverified marketplace listing, and it is the foundation of our reputation across LMR, public safety, broadcast, and cellular infrastructure customers.
Anritsu's RF and microwave test capability includes the 1993 acquisition of Wiltron Company, which brought Wiltron's network analyzer and signal generator technology and North American commercial presence into the Anritsu portfolio. Site Master cable and antenna analyzers, including the S311D/S312D series, are part of Anritsu's field RF test product family.
The Site Master S311D/S312D family consists of two models that share the same chassis, display, battery, connectivity, and cable and antenna analyzer architecture. Both cover 25 MHz to 1600 MHz cable and antenna measurements as standard, with optional extension down to 2 MHz (Option 2) for HF-band applications.
The primary differentiator between the two models is the integrated spectrum analyzer. The S311D is a dedicated cable and antenna analyzer. The S312D adds a 100 kHz to 1600 MHz spectrum analyzer, plus a wider option catalog including the Interference Analyzer, Transmission Measurement, Channel Scanner, CW Signal Generator, Power Meter, and Bias Tee — capabilities that are only available on the S312D platform.
Each pre-owned model below is listed on its own product page with condition-matched pricing and configuration details. The S311D and S312D share most accessories, calibration components, and test port cables, so a customer standardizing on the Site Master platform can mix and match cal kits, adapters, and probes across both models in the same field kit.
The S312D's combination of cable and antenna analyzer plus spectrum analyzer in a single handheld is the configuration most often specified for tower commissioning crews who need both physical-layer fault location and spectral environment characterization in one trip up the tower. Buyers focused exclusively on cable and antenna sweeps without spectrum analysis requirements typically standardize on the S311D.
The model-level decision comes down to whether the spectrum analyzer and its associated options are required. If the application involves interference hunting, channel power measurement on P25 or TETRA signals, transmitter verification, or any of the S312D-only options (Interference Analyzer, Channel Scanner, Transmission Measurement, CW Signal Generator, Power Meter, or Bias Tee), the S312D is the required configuration.
If the application is strictly cable and antenna sweeps, DTF fault location, and optional High Accuracy Power Meter measurements with the PSN50 sensor, the S311D covers the requirement at a lower configuration cost. Both models support the Power Monitor (Option 5), the High Accuracy Power Meter (Option 19), the 2 MHz Frequency Extension (Option 2), and the GPS Receiver (Option 31). Refer to the comparison table that follows for the option availability matrix.
| Model | Cable & Antenna Analyzer Range | Spectrum Analyzer Range | Spectrum Analyzer Included |
|---|---|---|---|
| S312D | 25 MHz to 1.6 GHz (2 MHz with Option 2) | 100 kHz to 1.6 GHz (tunable to 9 kHz) | Yes |
| S311D | 25 MHz to 1.6 GHz (2 MHz with Option 2) | — | No |
Additional differences in specifications beyond the few shown above are not listed here — see each model's full specifications below.
| Cable and Antenna Analyzer (S311D/S312D) | |
|---|---|
| Frequency Range | 25 MHz to 1.6 GHz |
| Frequency Accuracy | ≤±75 ppm at +25°C |
| Frequency Resolution | 100 kHz |
| Output Power | <0 dBm (−10 dBm nominal) |
| Immunity to Interfering Signals | On-channel: +17 dBm; On-frequency: −5 dBm |
| Measurement Speed | ≤3.5 msec / data point (CW ON) |
| Number of Data Points | 130, 259, 517 |
| Return Loss Range | 0.00 to 60.00 dB, Resolution 0.01 dB |
| VSWR Range | 1.00 to 65.00, Resolution 0.01 |
| Cable Loss Range | 0.00 to 30.00 dB, Resolution 0.01 dB |
| Measurement Accuracy | >42 dB directivity after calibration |
| DTF Vertical Range | Return Loss: 0.00 to 60.00 dB; VSWR: 1.00 to 65.00 |
| DTF Horizontal Range | 0 to (# of data pts −1) x Resolution to a maximum of 1497 m (4909 ft) |
| DTF Horizontal Resolution (Rectangular Windowing) | Resolution (meter) = (1.5 x 108) x (Vp)/ΔF |
| 2 MHz Frequency Extension (Option 2) | |
| Frequency Range | 2 MHz to 1600 MHz (all other specs same as standard S31xD) |
| Spectrum Analyzer (S312D) | |
| Frequency Range | 100 kHz to 1.6 GHz (tunable to 9 kHz) |
| Frequency Reference (Internal Timebase) Aging | ±1 ppm/yr |
| Frequency Reference Accuracy | ±2 ppm |
| Frequency Span | 10 Hz to 1.599 GHz in 1, 2, and 5 step selections in auto mode, plus zero span |
| Sweep Time | ≤1.1 sec full span; ≤50 µsec to 20 sec selectable in zero span |
| Resolution Bandwidth (−3 dB) | 100 Hz to 1 MHz in 1-3 sequence, ±5% Accuracy |
| Video Bandwidth (−3 dB) | 3 Hz to 1 MHz in 1-3 sequence, ±5% Accuracy typical |
| SSB Phase Noise (1 GHz) at 30 kHz Offset | ≤−75 dBc/Hz |
| Spurious Responses Input Related | ≤−45 dBc |
| Spurious Residual Responses | ≤−90 dBm, ≥10 MHz; ≤−80 dBm, <10 MHz (10 kHz RBW, pre-amp on) |
| Total Level Accuracy | ±1 dB typical (±1.5 dBm max), ≥10 MHz to 1.6 GHz; ±2 dB typical, <10 MHz |
| Measurement Range | +20 dBm to −135 dBm |
| Input Attenuator Range | 0 to 51 dB, manually or automatically coupled, 1 dB steps |
| Displayed Average Noise Level | ≤−135 dBm, ≥10 MHz (preamp on); ≤−115 dBm, <10 MHz (preamp on) |
| Dynamic Range | >65 dB, typical |
| Display Range | 1 to 15 dB/division, in 1 dB steps, 10 divisions displayed |
| Scale Units | dBm, dBV, dBmV, dBµV, V, W |
| RF Input VSWR | (with ≥20 dB atten.), 1.5:1 typical, (10 MHz to 1.6 GHz) |
| Power Monitor (Option 5) | |
| Display Range | −80 to +80 dBm (10 pW to 100 kW) |
| Measurement Range | −50 to +16 dBm (10 nW to 40 mW) |
| Resolution | 0.1 dB, 0.1 µW |
| Accuracy | ±1 dB |
| Bias Tee (Option 10A, S312D) | |
| Voltage | +12 V to +24 V (variable in 1 V steps) |
| Power | 6 W steady state |
| Current | 6 W/Voltage (V) |
| High Accuracy Power Meter PSN50 (Option 19) | |
| Sensor Measurement Range | −30 to +20 dBm |
| Sensor Frequency Range | 50 MHz to 6 GHz |
| Sensor Input Connector | Type N, male, 50 Ω |
| Max Input without Damage | +33 dBm, ±25 VDC |
| Input Return Loss | 50 MHz to 2 GHz: ≥26 dB; 2 GHz to 6 GHz: ≥20 dB |
| Total RSS Measurement Uncertainty (0 to 50°C) | ±0.16 dB (excludes mismatch errors) |
| Noise | 20 nW max |
| Zero Set | 20 nW |
| Zero Drift | 10 nW max (after 30 minute warm-up) |
| Sensor Linearity | ±0.13 dB max |
| Instrumentation Accuracy | 0.00 dB |
| Sensor Cal Factor Uncertainty | ±0.06 dB |
| Temperature Compression | ±0.06 dB max |
| Continuous Digital Modulation Uncertainty | +0.06 dB (+17 to +20 dBm) |
| System Measurement Resolution | 0.01 dB |
| System Offset Range | ±60 dB |
| Supply Voltage | 8 to 18 Vdc |
| Supply Current | <100 mA |
| Transmission Measurement (Option 21, S312D) | |
| Frequency Range | 25 MHz to 1.6 GHz |
| Frequency Resolution | 10 Hz |
| Offset Range | 0 to +60 dB |
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
Anritsu
Condition
Used
Manufacturer
Anritsu
Frequency
1.6 GHz
30+ Years in Business
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30+ Years in Business
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Knowledgeable Staff
On-site Lab
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