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  Master Reference Oscillator (MRO)
 

Spectrum Microwave line of Master Reference Oscillators (MROs) are state-of-the-art designs utilizing vibration hardened, ultra low noise, crystal oscillators intended for sever environments such as heavy ground or vibration prone airborne applications. These Master Reference Oscillators (MROs) utilize a unique dampening structure, suspending the oscillator in mid-air isolating it from the detrimental effects of microphonics on phase noise performance. These Master Reference Oscillators (MROs) are ideally suited when high performance is a must.

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.

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

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)
View PDF 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