Novus PICOPOD NR7000 User manual

Users manual
NR7000
Revision #:
B
Date:
102121
Page #:
1 of 24
www.novuspower.com
NR7000
picoPOD
10, 50,100 MHz GNSS-Locked OCXO Reference
with NMEA, PPS and Auto-Cal
All information provided herein is the property of Novus Power Products
L.L.C. The information included may be reproduced without the permission
or prior approval of Novus Power Products L.L.C. for the purpose of
operating the equipment.

Users manual
NR7000
Revision #:
B
Date:
102121
Page #:
2 of 24
www.novuspower.com
Contents
1.0 Summary ..........................................................................................3
2.0 Inputs / Outputs ..............................................................................7
2.1 GNSS Antenna ............................................................................................... 7
2.2 SAMTEC Connector (10-pin MiniMate)............................................................. 8
2.3 PPS (Pin)....................................................................................................... 8
2.4 10 MHz sine (SMA)......................................................................................... 9
3.0 Typical Phase Noise .......................................................................10
4.0 Built-in Test....................................................................................11
5.0 Power .............................................................................................12
6.0 GNSS Function ...............................................................................13
7.0 Programming Guide (STATUS Port) ..............................................15
7.1 Status Commands.........................................................................................16
7.2 Status Strings ($GPNVS)................................................................................17
8.0 Mechanical .....................................................................................18
9.0 Performance...................................................................................19
Technical Specifications ......................................................................................19
Environmental and Mechanical ............................................................................21
10.0 LIMITED HARDWARE WARRANTY ..............................................22
11.0 Appendix: GPS/GNSS Command Reference ..............................24

Users manual
NR7000
Revision #:
B
Date:
102121
Page #:
3 of 24
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1.0 Summary
The NR7000 is a GNSS-locked OCXO 10 MHz frequency
reference with auto-calibration. It features a 10 MHz Sine
output that is fault and transient protected.
The unit is also available at 50 and 100 MHz
The unit also provides a PPS and NMEA 0183 at full RS232
levels. The RS232 ports can also be configured to operate at
logic levels.
The master timing is from a 26 channel GNSS receiver that
supports GPS, GLONASS, SBAS, QZSS. By being able to
receive data from multiple satellite constellations, lower TIFF is
achieved. With twice the number of satellites in view, as a GPS
only configuration, achieving and maintaining lock in poor signal
environments is enhanced.
The signal source is a GNSS disciplined low noise OCXO,
actively controlled by a mixed-signal control loop. Typical
phase noise performance follows.

Users manual
NR7000
Revision #:
B
Date:
102121
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picoPod 10 MHz Phase Noise
picoPod 100 MHz Phase Noise

Users manual
NR7000
Revision #:
B
Date:
102121
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OCXO Warm-up Characteristics
Power required is 5.0Vdc to 5.5Vdc. This must be a low noise
source. Local filtering is recommended. There is internal
filtering but noise on the input power, while attenuated, can
compromise phase noise. The input filtering should be near the
device using design methods that are consistent with RF
methodologies. The circuit below is recommended and uses
three capacitor technologies- aluminum electrolytic, tantalum
and ceramic.

Users manual
NR7000
Revision #:
B
Date:
102121
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The NR7000 continually monitors temperature and aging so
that, when the unit goes into holdover or loses GNSS lock, the
output frequency reverts to the last known locked frequency
value. The calibration feature continually monitors the
correction coefficients developed through GNSS timing
information. These are sampled multiple times per day and
stored in non-volatile memory and, in the event of a GNSS loss,
the saved coefficients are applied to the OCXO. This
effectively eliminates long-term crystal drift. Auto-Cal normally
keeps the reference ±10 ppb.
There are two RS232 ports - one for NMEA 0183 and the other
for unit status reporting. The NMEA port information and baud
rate can be selected via commands detailed in the Appendix.
The RS232 port provides the status of each channel and self-
test results. The RS232 signals are made available through one
DB-9 or a stacked DB-9 pair.
All inputs and outputs are electrostatic discharge protected. Any
output can be shorted indefinitely with no permanent damage to
the unit.

Users manual
NR7000
Revision #:
B
Date:
102121
Page #:
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2.0 Inputs / Outputs
Each output is fault and electrostatic discharge protected. Each
output is independent and any output can be faulted for an
indefinite period of time with no permanent damage. Each
output is connected to a monitor circuit that detects a local fault
on the output. The fault status is indicated for each of the 10
MHz outputs on a LED on the PCB or via the RS232 link.
2.1 GNSS Antenna
SMA female antenna connection. Provides internal 3.3VDC
power at 45mA max. The Novus NA103 pole mount antenna or
the Novus NA106 magnetic mount antenna are recommended
for optimal performance.
The receiver and companion elements generate the PPS and
NMEA serial link. The serial link conforms to NMEA 0183
protocol. The 26 channel high-sensitivity, high-accuracy Multi-
GNSS receiver supports TRAIM, GPS, GLONASS, QZSS,
SBAS, Active Anti-Jamming and Advanced Multipath Mitigation
Functions.
Typical Antenna Specifications:
Frequency Band 1574 –1607 MHz
Antenna Gain 2 dBic @ 90°
Amplifier Gain @ 3.0Vdc: 26dB (typ)
Polarization RHCP
Out-of-band Rejection >60dBc @ f0 ± 50MHz
Impedance 50Ω

Users manual
NR7000
Revision #:
B
Date:
102121
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VSWR 2.0 Max
DC Input 2.8V - 6V
Noise Figure <2.0dB
Power Consumption 25mA (typ)
2.2 SAMTEC Connector (10-pin MiniMate)
The NR7000 has a single locking 10 pin SAMTEC MiniMate
0.1” connector (part number IPL1-105-01-L-D-RA-K).
10 pin MiniMate pinout
The reserved pins should not be connected.
There is an optional auxiliary output configuration. This option
provides a programmable LVCMOS output that is an n-divisor
of the internal bus frequency.
Optional Auxiliary LVCMOS output
2.3 PPS (Pin)
The PPS is a one pulse per second, LVCMOS, 3.3V signal into
1KOhm. The pulse width is nominally 100 ms but can be
programmed at the factory or in the field with the serial port
(see Appendix A). The PPS may be advanced/delayed via
serial port commands in 1 ns to compensate for antenna
cabling delays.
+5Vdc RES PPS IN TX RES
GND GND PPS OUT RX RES
+5Vdc RES PPS IN TX AUX OUT
GND GND PPS OUT RX GND

Users manual
NR7000
Revision #:
B
Date:
102121
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2.4 10 MHz sine (SMA)
8 +-2 dBm into 50 Ohms.

Users manual
NR7000
Revision #:
B
Date:
102121
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3.0 Typical Phase Noise
10MHz Sine- Primary Output
Offset Frequency (Hz) Typical (dBc / Hz)
10 -102
100 -110
1K -140
10K -145
There are optional phase noise performance levels available -
contact factory.