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GNSS and GPS Locked Timing Sources and Distribution Amplifiers for Software Defined Radio Systems

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Many SDR systems involve multiple radios that must be stabilized and triggered precisely. The embedded oscillators in the radios must be disciplined and the trigger points be exact. A GPSDO is an excellent choice for this application. As can be seen in the figure, a GPSDO and distribution amplifiers are used to provide 10 MHz to discipline the oscillators and pulse distribution amplifiers are used to synchronize the trigger for the radios. By using a GPSDO, software defined radios can be synchronized that are separated by large distances. Channel matching or “skew” is an important parameter for the distribution amplifiers. Novus offers three and ten channel distribution amplifiers with less than 5 ns of channel skew. With matched cables, very exact trigger points are possible.

Novus GPSDO Summary- All have PPS and RS232 NMEA

   Number of OutputsRack MountCompactPCB AssemblyPortablePower
NR6720-CAL 2       5 vdc*
NR3620-CAL 1       ± 60 vdc"
NR1111-O/G 4       85 to 260 vac
NR4400 1       5 Vdc
NR4300-O 1       5 vdc*
NR4320-O 2       5 vdc*
NR9400-O-G 1       •  AC/DC
NR4420-CAL 2         85 to 260 vac
NT9400 2       AC/DC
NR2310-O/G 10       85 to 260 vac

*AC Power Adapter Available
Kits Available for All Models (Antenna, Cable, Power Supplies)

 

NR3620_CAL  Self-Calibrating GPSDO with NMEA and PPS

NR3620
General purpose GPSDO. Low noise OCXO based reference offers 10 MHz, NMEA and PPS. Status relays can be wired into an alarm panel to alert of a failed self-test condition or if the unit cannot achieve GPS lock. Wide power operating range includes -60 to +60 Vdc (in three ranges). Auto-Calibration feature stores the most current OCXO compensation coefficients. (see Youtube video- https://www.youtube.com/watch?v=uAXjvuEEgUg)
 
 
 
NR3623 angle
 
 
General purpose triple channel GPSDO. Low noise OCXO based reference offers 10 MHz, NMEA and PPS. Status relays can be wired into an alarm panel to alert of a failed self-test condition or if the unit cannot achieve GPS lock. Wide power operating range includes -60 to +60 Vdc (in three ranges). Auto-Calibration feature stores the most current OCXO compensation coefficients.
 
 
 
 

NR2310

10 Channel 1 ru GPS locked reference frequently eliminates the need for a distribution amplifier- saving rack space and cost. GPSDO features low noise OCXO and Auto-Calibration

 

 

 NR1110 4 Channel OCXO Based GPS Locked Reference

 

NR110 angle

 A precision low noise four channel GPS locked frequency reference. The unit is available as a low noise OCXO based reference or as an ultra-stable atomic based reference. Unit provides NMEA and PPS with 20 ns rms accuracy. Front panel indicators provide self-test status, indication of output impedance mismatch and antenna open/fault facilitate system operational management.

 

 NR2310-PPS 10 Channel PPS Source2310-PPS 10 Channel PPS Source

NR2310
 

Built-in 26 Channel GNSS receiver provides 20 ns rms accuracy PPS pulse delivered on ten transient and fault protected channels. Channel skewing typically less than 5 ns.

 

 

 

NR1111-O Four Channel GPSDO with PPS, NMEA, Status Display and NTP Time Server Option

mask nr111

Four channel GPSDO meets the synchronization needs for more complex systems. PPS and NMEA signals come standard. Large LCD display presents time and unit status. External event input (3.3 vdc logic) causes the current time and position to be recorded and stored. The event data can also be e-mailed to a user defined IP address. Optional NTP time server provides precise timing for a local equipment network. GPSDO features low noise OCXO and Auto-Calibration.

 

 

ND0100-R 10 Channel Reference Distribution Amplifier

ND0100 R or P 10

Ten channel low noise frequency reference distribution amplifier. 10 identical amplifiers feature skew of ~ 5 ns. Each channel independently monitored for load impedance mis-match with independent warning indicators on the front panel. Outputs are transient and short circuit protected. Harmonic distortion well below -30 dBc. Minimal additive phase noise—(see figure of phase noise before and after). Wide bandwidth amplifier operates from 50 KHz to 10 MHz (±2 dB). DC to 10 MHz bandwidth option available.


 

  ND0100-P 10 Channel Pulse Distribution Amplifier

ND0100 R or P 10

Ten channel pulse distribution amplifier. 10 identical amplifiers feature skew of ~ 5 ns. Each channel independently monitored for load impedance mis-match with independent warning indicators on the front panel. Outputs are transient and short circuit protected.




ND0103-R 3 Channel Reference Distribution Amplifer

ND0103 R or P

Three channel low noise frequency reference distribution amplifier. Three identical amplifiers feature skew of ~ 5 ns. Each channel independently monitored for load impedance mis-match with independent warning indicators on the front panel. Outputs are transient and short circuit protected. Harmonic distortion well below -30 dBc. Minimal additive phase noise—(see figure of phase noise before and after). Wide bandwidth amplifier operates from 50 KHz to 10 MHz (±2 dB). DC to 10 MHz bandwidth option available.

 
  ND0103 –P 3 Channel Pulse Distribution Amplifier

ND0103 R or P

Three channel pulse distribution amplifier. Three identical amplifiers feature skew of ~ 5 ns. Each channel independently monitored for load impedance mis-match with independent warning indicators on the front panel.

 

  NR3623-PPS 4 Channel PPS Source

 

NR3623 with phone copy copy

 

 

 

Four PPS ouputs at 3.3 VDC LVCMOS.  Accuracy 20ns(1σ) (@-130 dBm).

26 Channel GNSS receiver acquires quickly and can be programmed to compensate for cable delays. Can operate from an AC power adapter

or from -60 to +60 VDC in three ranges.

 

 

 

 sdr1 copy

The NR3620 provides a low noise 10 MHz reference to stabilize radio oscillators and the PPS pulse as a software defined radio trigger source. The pulse distribution amplifiers provide reliable signal amplitude with channel skewing of less than 5 ns.


Multiple SDR