Specifications

Masterclock, Inc.
phone (USA and Canada): 1-800-940-2248 | phone (international): [phone]
email: [e-mail] | online: www.masterclock.com
Key Features
• Available in three precision grade levels
• Typical holdover stability of 1 ppb/day,
or better with OCXO
• Optional 10MHz Sine Wave Frequency
Reference Output
• Locks to most accurate time source
(GPS Receiver, Time Code Reader, NTP
Client)
• May be added to MCR1000 or
MCR5000
Additional Option MCR-10Mhz
10MHz Sine Wave
Reference Output Option
Masterclock’s MCR-HSO (High Stability Oscillator) is an add-in
module option for Master Clock Reference devices which provides
precision time and frequency for a wide range of applications.
Affordable price and flexible order options make this a popular add-
in for meeting critical time keeping during holdover (loss of primary
reference such as GPS) as well as for specialized applications
requiring a precise frequency reference.
The HSO option maintains excellent holdover stability of 1ppb/day or
better using an OCXO. Various grade level options are available for
specific applications.
An optional precision frequency 10MHz sine wave reference output
is available as a source for laboratory use, or an RF reference such as
cellular applications. When locked to GPS, the 10 MHz sine wave
frequency will have the same long-term stability as an atomic clock.
Each MCR may be ordered with an MCR-HSO module option. The
MCR-HSO option is required for all 10 MHz sine wave references.
Multi-functional Master Clocks
MCR-HSO Module
Specifications
High Stability Oscillator (HSO) Grade Option
Freq = 10.000000 MHz
Ref Waveform = Sine wave
1 3 4
Oscillator Type VCTXO OCVCXO OCVCXO
Level (dBm) @ 50Ohms 7dBm ±2dBm 7dBm ±1dBm 8dBm ±1dBm
Freq Stability - Aging /day TBD
±1.0 ppb/day
(1x10E-9)
±0.1 ppb/day
(1x10E-10)
Freq Stability - Aging/year
±1 ppm/year
(1x10E
-6
)
±0.3 ppm/year
(3x10E
-7
)
±0.1 ppm/year
(1x10E
-7
),
Short Term Stability
(Allan Variance) 1 sec gate
TBD ≤ 1.0 e
-10
≤ 5.0 e
-11
Time Drift per Year (max)
±3 sec ±.0.3 sec ±0.15 sec
Temp Stability
±2.5ppm
(-30 to 75°C)
±0.010 ppm
(-5 to 50°C)
±0.050 ppm
(0 to 50°C)
Gain 1 1 1
Number of Outputs –
(10 MHz Sine wave Option)
1
(clipped sine wave)
1 1
Harmonic NA -30dBc Max -30dBc Max
1Hz NA NA -95
10Hz NA -120 -125
100Hz NA -130 -140
1kHz NA -140 -150
10kHz NA -145 -150
Phase Noise
(dBc/Hz) @ 10MHz
100kHz NA -145 -150
Optional Interconnects:
10MHz Ref -
SMA female (MCR1000)
BNC female (MCR500)
MCR-HSO Module
1.3. 5