The LNFS-400 is a versatile low noise synthesizer with an output frequency range of 1 to 400 MHz. The instrument has 48 bit frequency resolution, 14 bit phase resolution and a low noise internal time base that can be phase-locked to an external 5 or 10 MHz signal for long term stability. Applications include frequency generation for instrumentation, microwave synthesis, phase noise characterization, radar synthesizers and telecommunication clock generators. The LNFS-400 has FSK and PSK modulation capabilities. The synthesizer is available in a stand alone enclosure or as a module. Model LNFS-400-RM is the stand alone version in a 2U rack-mount enclosure with LCD display and keypad. Remote control of the instrument is available through a RS-232 or USB interface. This unit may be ordered with up to three independent synthesizers locked to the internal time base. Model LNFS-400-NM is the NIM module version with a USB interface. The Noise Measurement System controller, model NMSC is used to control and program the synthesizer. The LNFS-400-NM may also be used with any PC with an available USB port. LabVIEW drivers and virtual instrument software are provided.

LNFS-400 Users Manual
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FeaturesApplications
  • Frequency range 1μHz - 400 MHz
  • Frequency resolution:  0.2Hz
  • Phase resolution:  0.38 mRadians
  • Low phase noise:   180 MHz output
                                         -130 dBc/Hz @ 1 kHz
                                         -140 dBc/Hz @ 100 kHz
  • Spurious components:  
                                         1 to 100 MHz: 60 dBc
                                         100 to 400 MHz: 52 dBc
  • Instrumentation
  • Microwave synthesis
  • Phase noise characterization
  • Radar synthesizers
  • Telecom clock generation
Specifications
Degrees
ParameterConditionsMinTypMaxUnits
Phase resolution - 0.022 - Degrees
Phase offset range - +/-360 -
Amplitude resolution - 1.0 - VRMS
Frequency resolution - .233 - Hz
Frequency tuning range - 1E6 - 400E6 - Hz
Mech tuning range - - +/-1 E-6 -
Int. oscillator aging After 30 days of operation - 1 E-6 - Per Year
Max Sine Output Level 50 ohm load
Accuracy +/-2
+14 +15 +16 dBm
Output isolation - 60 - dB
Phase noise L(f)
10 MHz Output, +13 dBm
10 Hz
100 Hz
1 kHz
>10 kHz
-
-
-
-
-130
-135
-135
-145
-125
-130
-130
-140
dBc/Hz
Allan deviation σy(t)
Locked to External Ref.
f=5E6
1 s
10 s
100 s

-
-
-

2.0 E-12
3.0 E-13
3.0 E-14

4.0 E-12
4.0 E-13
5.0 E-14
-
Allan deviation σy(t)
Locked to External Ref.
f=10E6
1 s
10 s
100 s

-
-
-

2.0 E-12
3.0 E-13
3.0 E-14

3.0 E-13
4.0 E-13
5.0 E-14
-
Spurious + 13 dBm Output Level -65 -50 -45 dBc
Harmonics + 13 dBm Output Level -60 -40 -30 dBc
External Reference 10.0 MHz ± 2.0 E-8     +10 dBm to +15 dBm
DC Tuning Voltage +/- 5VDC
External Trigger 400ns min. pulse width TTL Compatible Levels
AC Power 110–120/ 220–240VAC
Rack-mount Enclosure
Size: 3.5” X 16” X 19”
Weight: 20 lbs

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