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

Frequency Performance
• 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.