Agilent / Keysight 8782B Vector Signal Generator, 1 MHz to 250 MHz

The Agilent/Keysight 8782B Vector Signal Generator delivers complex modulated signal generation across 1 MHz to 250 MHz with 1 Hz frequency resolution. This instrument provides precise vector modulation control for testing communication systems, components, and RF devices across multiple digital and analog modulation formats.

Technical Specifications

• Range: 1 MHz to 250 MHz


• Resolution: 1 Hz


• Switching time: < 170 ms typical


• Frequency accuracy and stability matched to internal reference oscillator RF Output


• Level range: +7 dBm to -100 dBm (+10 dBm typical)


• Output accuracy: ±1.5 dB (≥ +30 dBm), ±2.0 dB (< -30 dBm to ≥ -80 dBm), ±2.4 dB (< -80 dBm)


• Flatness: < ±1 dB


• Resolution: 0.1 dB


• Output impedance: 50 ohms nominal


• Output SWR: 60 dB below selected level (for levels > -40 dBm) Spectral Purity


• Residual SSB phase noise (1 Hz BW): -115 dBc @ 1 kHz offset, -125 dBc @ 10 kHz offset (140 MHz carrier); -125 dBc @ 1 kHz offset, -130 dBc @ 10 kHz offset (1–250 MHz carrier)


• Residual FM: < 4 Hz RMS (300 Hz to 3 kHz bandwidth)


• Harmonics: < -30 dBc


• Non-harmonic spurious signals: -40 dBm) Internal Reference Oscillator


• Aging rate: < 1.5 × 10⁻⁹ per day (after 10-day warm-up)


• Temperature stability: < 1 × 10⁻⁷/°C typical


• Line voltage effects: < 1 × 10⁻⁸/V typical

Key Features Modulation Capability

• Supported formats: BPSK, QPSK, 8PSK, 16QAM, 64QAM, 256QAM, 9PRS, 25PRS, 49PRS, 81PRS, pulse, vector, and scalar (AM) modulation


• Arbitrary vector modulation bandwidth: Up to 100 MHz (200 MHz typical)


• Impairments simulation: Quadrature error, phase lock error


• Built-in PRBS generator for digital modulation without external data sources


• Unmodulated coherent carrier available for IF signal demodulation Vector Modulation (Analog I/Q Inputs)


• Frequency response: DC to 50 MHz (1 dB) @ 140 MHz carrier; DC to 100 MHz (1 dB) typical


• DC accuracy: 1.5% of full scale (typically 2% after calibration at 25°C with < 5°C drift)


• DC residual: 1% of full scale (typically 1.3% after calibration at 25°C with < 5°C change)


• Sensitivity: ±0.5 V into 50 ohms (±100% full scale magnitude)


• Input impedance: 50 ohms nominal


• Input SWR: < 1.5:1 (DC to 50 MHz)


• Quadrature adjustment: 80° to 100° ±0.2° accuracy

Typical Applications Communication system design and validation, RF component testing, digital modulation evaluation, and receiver performance characterization across VHF and UHF bands.

Compatibility & Integration 50 ohm system impedance. Supports analog I/Q vector inputs and coherent carrier output for modulation and demodulation applications.