MASTER REFERENCE OSCILLATORS (MRO)

API's line of Master Reference Oscillators (MROs) is state-of-the-art designs utilizing vibration hardened, ultra low noise, crystal oscillators intended for severe environments such as heavy ground or vibration prone airborne applications. Our MROs are full of features that make them:

Rugged
Stable
Accurate

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.

Consistent Phase Noise Performance

External Reference Sampling Without Distortion

Integration of x2 and x4 Multipliers

Many Cost-Effective Solutions Available

Comb Generators Spacing as Close as 1 MHz

Low Cost with a Smaller Footprint

Superior Phase Noise PLO

FEATURES
	Rugged
	These Master Reference Oscillators (MROs) are ideally suited when high performance is a must. Our line of MROs, intended for an airborne military application, exceed performance expectations and are ruggedized through the use of vibration hardened, low noise crystal oscillators.
	Stable
	We utilize SC cut crystal for stability and low noise. We minimize pushing through internal voltage regulation. Our MROs boast a low resonance (<10 Hz) vibration isolation system to minimize the effects of vibration on phase noise performance.
	Accurate
	The ovenized oscillator has a less than 10-minute warm-up to achieve 0.5 PPM accuracy. These IMAs feature integrated doublers (x2 and x4), amplifier, built in power test, and band pass filter circuits. These MROs also feature a TTL oven ready indicator.

MRO Specifications

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

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

SUPPORT

MRO EXTRAS