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  Master Reference Oscillator (MRO)
 

Spectrum Microwave’s line of Master reference oscillators (MROs) is vibration hardened ultra low noise Crystal oscillators intended for an airborne military application.

Features

  • SC cut crystal for stability and low noise.
  • Ovenized oscillator has a less than 10-minute warm-up to achieve 0.5 PPM accuracy.
  • Integrated doublers (x2 and x4), amplifier, built in power test, and band pass filter circuits.
  • TTL oven ready indicator.
  • Internal voltage regulation to minimize pushing.
  • Low resonance (<10 Hz) vibration isolation system to minimize the effects of vibration on phase noise performance.

Typical Performance Characteristics

Frequency 60 – 480 MHz
Output power level +20 dBm
Aging +/-1PPM per year after 30 days operation
Harmonics -40 dBc
Spurious -90 dBc max in a +/-2 MHz B.W. about 160 MHz -75 dBc from +/-2 MHz to +/-20 MHz about 160 MHz
Temperature stability +/- 0.5 PPM , -20 to +60° C, REF +25° C
Dimensions 6.75" x 5" x 2.688"
Connector RF SMA female
Connector E-tune SMA Female
DC and Bits Male 9 pin D connector
Packaging Machined aluminum housing Nickel plated per MIL-C-26074
DC power 15 V
DC current 1.5 A during warm up 0.5 A after warm up
VSWR 1.5:1 max @160 MHz into a 50 ohm system
Master Reference Oscillator (MRO)
Master Reference Oscillator
(240 KB PDF)

Phase Noise (60 MHz – 120 MHz output frequency)

Offset Freq Hz Static Noise dBc/Hz Dynamic Noise dBc/Hz
10 -100 -84
100 -131 -116
1000 -158 -152
10K -173 -172
20K -176 -176
1Meg -176 -176

Phase Noise (120 MHz – 240 MHz output frequency)

Offset Freq Hz Static Noise dBc/Hz Dynamic Noise dBc/Hz
10 -95 -78
100 -125 -110
1000 -152 -146
10K -167 -166
20K -170 -170
1Meg -170 -170

Phase Noise (240 MHz – 480 MHz output frequency)

Offset Freq Hz Static Noise dBc/Hz Dynamic Noise dBc/Hz
10 -89 -72
100 -119 -104
1000 -146 -140
10K -161 -160
20K -164 -164
1Meg -164 -164