4.4GHz RF Signal Generator


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The DS Instruments SG4400L compact RF Signal Generator enables users to generate a high quality RF signal easily and at low cost. The output covers 35 to 4400 MHz. The produced wave is fully synthesized using modern fractional N synthesis. The step size of the RF output  varies from a maximum of ~1.5KHz to less than 25Hz , depending on band of operation. The synthesized source has its own internal precision 10 MHz reference frequency. Maximum output power is calibrated to +15dBm, and can be adjusted in 0.25dB steps down to -25dBm. The crisp OLED display provides useful feedback for the user, and front control buttons provide a quick alternative to USB control. Like most of our products, the SG4400L easily fits in the palm of your hand, making it a truly portable and bench-space-saving device.

Need lower harmonic content? SG6000F Model

Low phase-noise, ultra small frequency step, PureSine model: SG6000PRO

Need higher frequency? Try the SG12000L

NOTE: We can configure this device with no OLED or buttons for a discounted price and a lead time of around 1-2 weeks. Please request a quote if this configuration is a good fit for your usage!

SG4400L (Rev 18-2024) Features:

  • New internal harmonic-filtering hardware (2024)
  • High-resolution adjustable RF signal output power
  • New more-robust output amplifier
  • Flexible frequency-sweeping support
  • Lower phase-noise than SG6000L
  • Internal 10MHz reference source
  • External reference input auto-detection
  • Professional industry-standard SCPI command support
  • Front user control buttons
  • Front-mounted bright OLED display
  • Sturdy all-aluminum powder-coated black enclosure
  • Friendly and simple PC control software
  • Optional Ethernet control

RF Signal Generator Specifications:

  • Frequency Range: 35-4400 MHz
  • Power Output Range (calibrated steps): -25 to +15dBm
  • Power Output Range (uncalibrated vernier): -30 to +17dBm Typ.
  • Typical harmonic levels (0.3-4.4GHz):  -30dBc
  • Phase Noise @ 4.4GHz: -82dBc @ 10KHz offset
  • Power control resolution: 0.25dB steps & 0.1dB variable
  • Internal 10MHz reference stability: ±2.5PPM TCXO
  • Dimensions: 2.75″ x 1.25″ x 2.15″
  • Input Voltage: 5V standard USB-C
  • Output Impedance: 50 Ohm
  • RF Output Port: Premium 18GHz SMA
  • 10MHz Reference Port: MCX

 Common Applications:

  • Automated testing environments
  • General RF Lab use
  • Flexible LO sourcing
  • Antenna design
  • EMC Testing
  • Production verification and testing
  • Educational / university lab use
  • Aerospace / Defense Research

Performance Plots:

Mechanical Information:

mini attenuator


UPC: 737212885872

Additional information

Weight N/A
Device Configuration

Ethernet & USB & Display, No Display or Buttons, USB & Display

DS Instruments will be closed for a summer vacation the week of July 15th through July 19th.

Sorry for the inconvenience, and thank you for your patience!