Agilent / Keysight 8657D Pi/4 DQPSK Signal Generator for NADC & PDC
Agilent / Keysight Signal Generators. Frequency Range: 100 kHz to 1.03 GHz, Power Range (dBm): –144 dBm to +13 dBm.
- Model
- Agilent / Keysight 8657D
- Calibration
- Available on request
- Price
- $709
- Status
- In stock
- RFQ ref
- 8657D
This unit
The Agilent/Keysight 8657D is a specialized Pi/4 DQPSK signal generator engineered for NADC and PDC wireless system validation. It extends the 8657 series with digital modulation capability essential for testing North American Digital Cellular and Japanese Personal Digital Cellular mobile devices across R&D, manufacturing, and field support environments.
Technical Specifications
Frequency Performance- Frequency range: 100 kHz to 1.03 GHz (analog)
- Frequency resolution: 1 Hz
- Underrange capability: 10 kHz with uncalibrated output and modulation
- Switching speed: +16 dBm at most frequencies
- Absolute level accuracy: ±1.5 dB (>+7 dBm); ±1.0 dB (+7 dBm to –127 dBm); ±1.5 dB (<–127 dBm)
- Level flatness: ±0.5 dB (100 kHz to 2.06 GHz at 0 dBm setting)
- Reverse power protection: 50 W
- Output impedance: 50 Ω nominal Modulation Specifications
- Standard modulation: AM, FM, Pulse Modulation
- Pi/4 DQPSK for NADC/PDC digital applications
- Error Vector Magnitude (EVM): <3.2%
- DC-coupled FM: Eliminates droop on low-rate tones or digital data
- Pulse modulation (8657B): Rise/fall times 70 dB on/off ratios Spectral Purity
- Low residual FM: <4 Hz at frequencies <1040 MHz (8657B)
- Low single-sideband phase noise for adjacent channel selectivity testing
- Low RF leakage minimizes measurement interference
Key Features
- Calibrated output from 100 kHz to 1.03 GHz with 1 Hz resolution
- Standing Wave Ratio <1.5 (levels ≤–6.5 dBm); <2.0 (levels ≤+13 dBm) on 8657B
- Pi/4 DQPSK capability optimized for NADC and PDC standards
- Exceptional frequency stability with minimal retuning drift
Typical Applications
- NADC and PDC mobile device receiver/transmitter validation
- Manufacturing test for digital cellular handsets
- Field support and troubleshooting of wireless systems
- Adjacent channel selectivity and modulation accuracy testing
Compatibility & Integration The 8657D builds on the proven 8657 platform, providing backward compatibility while adding specialized digital modulation for cellular standards.
Specifications
| Parameter | Value |
|---|---|
| Frequency Range | 100 kHz to 1.03 GHz | Power Range (dBm): –144 dBm to +13 dBm |
Agilent / Keysight 8657D — Repair & Calibration Service
Aumictech offers NIST-traceable calibration and repair for the Agilent / Keysight 8657D. Calibration covers output frequency accuracy, output power level accuracy across the full frequency range, AM/FM/PM/pulse modulation accuracy, harmonic and spurious output levels, and phase noise floor verification. All calibrations ship with a NIST-traceable certificate. Turnaround is typically 1–3 business days after receipt.
Common Agilent / Keysight 8657D faults: YIG oscillator failure (no output or loss of lock), step attenuator wear (output drops or steps at set attenuation), ALC loop failure (uncontrolled output power), I/Q modulator assembly failure. HP/Agilent 836xx series most common faults are YIG oscillator failure and step attenuator contact wear causing output steps or drops at specific attenuation settings. Keysight E4428C/E4438C units most commonly develop ALC loop failure and I/Q modulator assembly faults. YIG oscillator replacement and attenuator service are stocked repairs.
Agilent / Keysight 8657D price
This Agilent / Keysight 8657D is listed at $709. Calibration is available separately from $450. Contact us for volume pricing or if you need multiple units.
Agilent / Keysight 8657D calibration cost
NIST-traceable calibration for the Agilent / Keysight 8657D is $450 (standard — pass/fail certificate and calibration sticker) or $650 (full measured data at every test point, reference standards documented, traceability chain included). Calibration for this instrument covers output frequency accuracy, output power level accuracy across the full frequency range, AM/FM/PM/pulse modulation accuracy, harmonic and spurious output levels, and phase noise floor verification. Turnaround is 1 to 3 business days after receipt. See full calibration details →
