PLO-4000 series Phase Locked Dielectric Resonator Oscillator (PLDRO) utilizes state-of-the-art MIC and SMT to provide crystal stability at microwave frequencies up to 50 GHz. The low profile and rugged construction provide excellent durability against harsh environmental conditions. This model works with external reference of 5 or 10 MHz.

PLO-4000 series oscillator is designed using FET or BJT amplifier with series feed back at source and Dielectric Resonator at the gate. High gain, low-noise FETs/BJTs are biased negatively at the gate to ensure minimum phase-noise. The device is carefully matched for maximum power, minimum phase-noise and Voltage Standing Wave Ration (VSWR). The oscillator is matched for maximum temperature stability and optimum negative resistance.

PLO-4000 series oscillator is buffered by cascaded low-noise driver and power amplifiers for minimum load pulling, maximum isolation and power. FET/BJT devices are directly attached to gold plated Kovar carriers to minimize shear effect and maximize heat sinking. Kovar carriers are mounted to the chassis to provide an efficient thermal junction and a stable structure for reduction of microphonics. To ensure oscillator stability over the full temperature range, the tuning elements are precisely designed and positioned to compensate for temperature drift by a factor of three.

PLO-4000 series proprietary Phase lock loop and Internal Multiplier circuitry uses Surface Mount Technology. The reference frequency is multiplied and sampled to output frequency. Produced error voltage due to frequency drift is sensed by a Wein-Bridge Oscillator to provide the necessary sweep voltage to an ultra Hi-Q tuning varactor diode for the purpose of compensation and phase locking. The unique construction of phase lock loop sub-assembly provides excellent temperature stability and minimum solder joints for maximum reliability.

PLO-4000 series is internally voltage regulated to avoid reverse bias, frequency pushing, bias modulation and voltage transients. A phase lock indicator alarm of TTL type is provided as a feature. The PLO-4000 series are externally reference locked and factory tuned to specified frequency. Mechanical frequency adjustment is provided for optimum phase voltage setting. Buffered Reference Monitor and adjustment are standard features of this Hi-Tech oscillator.


  • Dielectric resonator
  • 5 MHz or 10 MHz external reference
  • Phase lock indicator alarm
  • Low phase noise
  • MIC and SMT fabrication
  • Low microphonics
  • Low power consumption
  • Up to +25 dBm output power
  • Available from 1 – 50 GHz
  • Optional extended temperature range from -55ºC to +105ºC


  • Satellite communications
  • Cable TV links (CATV)
  • Local Area Networks (LAN)
  • Global Position Systems (GPS)
  • Test equipment
  • Point to Point communication
  • Up/Down converters
  • LMDS
  • Transmitters & Receivers
  • Digital radios
  • Missile guidance
  • Military, Space, and Commercial
General Parameters:
Single Frequency: 1.00 to 50.00 GHz
Power Output: +13 dBm, up to +25 dBm Optional
Load VSWR: 2.0 : 1.0
Harmonics: -25 dBc
Spurious: -80 dBc
Phase Noise: See Phase Noise Envelope
Frequency Stability: Same as reference
Operating Temperature: 0º to +50ºC STD, -55º to +105ºC OPTIONAL
Storage Temperature: -55 ºC to + 100ºC
Connectors: SMA Female or 2.9 mm
Size: 2.25? x 2.25? x 1.25?
Finish: Nickel
Mechanical Tuning Range: 100 MHz
Power Requirements: 12, +15 VDC, 220 mA
Reference Power Input: -6 To +6 dBm
Reference Input Frequency: 10 MHz or 5 MHz Optional
Alarm: TTL
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