| Frequency range | 
| R&S®FPS4 | 10 Hz to 4 GHz | 
| Aging of frequency reference | 1×10-6 per year | 
| with R&S®FPS-B4 option | 1×10-7 per year | 
| Resolution bandwidths | 
| standard sweep | 1 Hz to 10 MHz | 
| standard sweep, zero span | 1 Hz to 10 MHz, 20 MHz, 28 MHz
40 MHz optional | 
| FFT sweep | 1 Hz to 300 kHz | 
| Channel filter | 100 Hz to 5 MHz | 
| Video filter | 1 Hz to 10 MHz, 20 MHz, 28 MHz, 40 MHz | 
| Signal analysis bandwidth | 28 MHz | 
| with R&S®FPS-B40 option | 40 MHz | 
| with R&S®FPS-B160 option | 160 MHz | 
| Displayed average noise level (DANL) | 
| DANL (1 Hz bandwidth) | 
| 1 GHz | -152 dBm, -155 dBm (typ.) | 
| 3 GHz | -150 dBm, -153 dBm (typ.) | 
| With preamplifier, R&S®FPS-B22 option | 
| 1 GHz | -162 dBm, -165 dBm (typ.) | 
| 3 GHz | -160 dBm, -163 dBm (typ.) | 
| Intermodulation | 
| Third-order intercept (TOI) | 
| f < 3.6 GHz | +13 dBm, +16 dBm (typ.) | 
| Dynamic range WCDMA ACLR | 
| without noise compensation | 70 dB | 
| with noise compensation | 73 dB | 
| Phase noise | 
| 1 GHz carrier frequency | 
| 10 kHz offset from carrier | -106 dBc (1 Hz), -110 dBc (1 Hz) (typ.) | 
| 100 kHz offset from carrier | -115 dBc (1 Hz) | 
| 1 MHz offset from carrier | -134 dBc (1 Hz) | 
| Total measurement uncertainty | 
| 3.6 GHz | 0.28 dB |