The Anritsu Site Master S251C is a handheld, battery-operated 2-port cable and antenna analyzer designed specifically for tower top and duplex applications. Operating in the 625 MHz to 2500 MHz frequency range, it is optimized for field technicians working on cellular, PCS/GSM, and ISM systems. Featuring a second test port for isolation, gain, and insertion loss measurements, along with built-in FDR (Frequency Domain Reflectometry) technology for precise Distance-to-Fault analysis, the S251C provides high dynamic range and exceptional immunity to RF interference in active RF environments.
Specifications
General
| Parameter | Value |
|---|---|
| Interfaces | RS232 |
| Display | 640 x 480 monochrome LCD with backlight (standard) / TFT color display (Option 3 dependent) |
Physical
| Parameter | Value |
|---|---|
| Power Supply | AC/DC power supply, 12.5 VDC automobile cigarette lighter adapter, or rechargeable battery |
| Operating Temperature | -10 °C to 55 °C |
| Dimensions (W×H×D) | 300 x 178 x 80 mm |
| Weight | 1.8 kg (4 lbs) including battery |
Frequency and Amplitude Performance
| Parameter | Value |
|---|---|
| Frequency Range | 625 MHz to 2500 MHz |
| RF Source Frequency Steps | 100 kHz steps |
Vector Network Analysis Features
| Parameter | Value |
|---|---|
| Dynamic Range | >90 dB (for antenna isolation measurements) |
| Selectable RF Output Power | 0 dBm or -30 dBm |
Measurement Capabilities and Signal Processing
| Parameter | Value |
|---|---|
| RF Interference Rejection | Patented RF interference rejection feature |
| Measurement Modes | Return loss, cable loss, distance-to-fault (DTF), VSWR power meter, isolation, gain, and insertion loss |
| Distance-to-Fault Technology | Frequency Domain Reflectometry (FDR) |
| Display Markers | 6 markers, limit lines, and segmented limit lines |
| Cable Database | Pop-up menus featuring over 70 cable types with velocity of propagation and attenuation values |
| Power Monitor Option | Optional external power monitor compatibility |
| Bias Tee Support | Optional built-in Bias Tee |
| Distance Units | Selectable feet and meters |
System Architecture and Storage
| Parameter | Value |
|---|---|
| Saved Test Setups | Up to 10 measurement configurations |
| Saved Measurement Traces | Up to 200 traces |
| Data Labeling | Alphanumeric labeling with automatic time and date stamp |
| Multi-Language Support | English, French, Chinese, Japanese, Spanish, German |
Power and Electrical Specifications
| Parameter | Value |
|---|---|
| Battery Customization | Rechargeable, field-replaceable battery pack |
| Electrical Protection | Reverse, over voltage, and under voltage protection |
Environmental
| Parameter | Value |
|---|---|
| Storage Temperature Range | -20 °C to 75 °C |
| Maximum Operating Altitude | 4,500 m |
| Relative Humidity | 85% or less (non-condensing) |
Performance
| Parameter | Value |
|---|---|
| Sweep Speed | < 2.5 ms/data point (typical) |
| Data Points | 130, 259, 517 |
| Directivity (Corrected) | ≥ 42 dB |
| Source Match (Corrected) | ≥ 30 dB |
| Load Match (Corrected) | ≥ 38 dB |
| System Impedance | 50 Ω |
| Return Loss Resolution | 0.01 dB |
| VSWR Resolution | 0.01 |
Frequency
| Parameter | Value |
|---|---|
| Frequency Accuracy | ±75 ppm |
| Frequency Resolution | 100 kHz |
Inputs & Outputs
| Parameter | Value |
|---|---|
| Test Port Connector | N-type, female, 50 Ω |
| RF In Connector | N-type, female, 50 Ω |
Electrical
| Parameter | Value |
|---|---|
| Maximum Input Damage Level | +22 dBm, ±50 VDC |
Technology
Frequency Domain Reflectometry (FDR)
Applications
Cellular, PCS/GSM, and ISM field testing, tower top and duplex system analysis, antenna-to-antenna isolation, and TMA gain verification