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The WillTek HSA9102B 4 GHz 9102 Handheld Spectrum Analyzer Field Edition typical measurements include transmitter testing, alignment of modulators and measuring switch breakthrough. Additional options such as a tracking generator option, the 9160 VSWR/DTF Bridge and the 9130 VSWR/DTF Reflection Measurement Option expand the capabilities of the 9102 towards a scalar network analyzer. The analyzer is fully controllable via front panel or by remote control from a PC. For base station installation or maintenance engineers the 9102 offers the full scope of common performance measurements of the BTS antenna systems: Return Loss (Reflection), Tower-Mounted Amplifier (Transmission) and Distance to Fault measurement with a standard resolution of 500 points (min. 0.05 m) in one lightweight device. Measurement results and instrument settings can easily be transferred to a PC for presentation or post-processing. This rugged instrument is suitable for stationary and mobile usage and meets many application needs. Specifications. Frequency Range: 100 kHz to 4.0 GHz. Resolution: 1 kHz. Reference Frequency Temperature Stability: ??2 ppm. Reference Frequency Aging: ??1.5 ppm. Frequency Counter Resolution: 1 Hz, 10 Hz, 100 Hz. Frequency Span Setting Range: 0 Hz, 10 kHz to 4 GHz. Sweep Time: 1 ms to 250 s span >= 10 kHz; 1 ms to 250 s span = 0 Hz. Resolution Bandwidth (-3 dB) Range: 100 Hz to 1 MHz, Steps 1, 3, 10. Maximum Safe Input Level: +30 dBm. Display: 6.5", TFT."