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1.2.8
OSM Specifications
1.2.8.1 Universal Output Signal Module
The Universal OSM provides the ultimate in flexibility.
The Universal OSM has 4 outputs, each of which is
user-programmable to a wide variety of time code or
pulse outputs. This flexibility ensures that an M212 can
be reconfigured as requirements change, and fewer
modules are needed in comparison to designs where
modules are single function. Each output is individually
adjustable for propagation delay, ensuring that for high
accuracy synchronization different cable lengths can be
accommodated.
Available output formats per connector
1 PPS and 1PPM
•
HaveQuick
•
IRIG A, B, E, G, H
•
XR3, 2137
•
Specifications:
Pulse-per-second/minute
Signal Format
Per ICD-GPS-060B
1PPS Rate
1 pulse per second
1PPM Rate
1 pulse per minute
Rising Edge
On Time
Rise Time
<20ns
Fall time
<100ns
Pulse Width
20 µs ±5% default.
Amplitude
10V ±10% into 50Ω
Output condition
when TFOM<7 only
Have Quick Time of Day Output
Signal Format
Per ICD-GPS-060A
Rising Edge
On Time
Rise Time
<100ns
1PPS coherence
< 100ns of rising edge
Amplitude
5V ±5%
Output condition
when TFOM<7 only
BCD Time Code Output
Signal Format
Per ICD-GPS-060B
Rate
50 bits/sec
1PPS coherence
< 100ns of rising edge
Mark (logical 1)
+2.5V ±1V
Space
(logical 0) -2.5V ±1V
Output condition
when TFOM<7 only
Connector Type
3 Pin (Consult factory)
IRIG Time Code Output
Signal Format
B002, B122, B004, B124
(Consult factory for other formats)
Control Functions B124 per IEEE1344
Rate
1kHz modulated
Modulation ratio
10:3 ±10%
Amplitude
5V
±20%
p-p
Output condition
when TFOM<7 only
2137 Time code Output
Signal Format
2137
Carrier
1kHz modulated
Modulation ratio
10:3 ±10%
Amplitude
5V
±20%
p-p
Output condition
when TFOM<7 only
XR3 Time code Output
Signal Format
XR3
Rising Edge
On Time
Rise Time
<100ns
1PPS coherence
< 100ns of rising edge
Amplitude
5V ±5%
Output condition
when TFOM<7 only
Propagation delay compensation
Applicability
Range
Low Phase Noise Analog OSM
The Analog Low Phase Noise Module provides 4 low
phase noise reference frequency outputs at 5, or
10MHz. The OSM incorporates a clean-up OCXO that
is phase-locked to the MCM oscillator which must be
OCXO, CSAC, or a Rubidium oscillator
Specifications:
Waveform
Amplitude
Harmonics
Non Harmonic
Connector Type
Accuracy
Phase Noise
1.2.8.2 5MHz Output OSM
The 5MHz output OSM provides 4 reference frequency
outputs at 5 MHz. The OSM buffers and distributes a
5MHz signal that is generated directly on the MCM.
The stability and accuracy will reflect those of the
selected MCM oscillator.
Specifications:
Waveform
Amplitude
Harmonic
Non Harmonic
Connector Type
Accuracy
Stability
1.2.8.3 10 MHz Output OSM
The 10MHz output OSM provides 4 reference
frequency outputs at 10MHz. The OSM buffers and
distributes a 10MHz signal that is generated directly on
the MCM. The stability and accuracy will reflect those
of the selected MCM oscillator.
Specifications:
Waveform
Amplitude
Harmonic
Non Harmonic
Connector Type
Accuracy
Stability
11
MANUAL P/N 900000178 REV B
All 4 outputs individually
± 0 – 1ms in 5ns steps
Sinusoid
13 ±2 dBm/1V
rms
-40dBc
<-80dBc 10k - 500MHz
Coaxial, BNC
Locked to MCM oscillator
10MHz
dBc/√Hz
1Hz
-90dBc
10Hz
-120dBc
100Hz
-145dBc
1KHz
-155dBc
10KHz
-158dBc
Sinusoid
13 ±2 dBm/1V
rms
-35dBc
<-65dBc 10k - 500MHz
Coaxial, BNC
Locked to MCM oscillator
Same as MCM oscillator
Sinusoid
13 ±2 dBm/1V
rms
-35dBc
<-65dBc 10k - 500MHz
Coaxial, BNC
Locked to MCM oscillator
Same as MCM oscillator
5MHz
-95dBc
-125dBc
-148dBc
-155dBc
-158dBc
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