MSG-2051 is a high performance signal generator designed for generating the simulation signal of GPS (Global Positioning System) satellite.
特点
■ Frequency stability of internal reference oscillator is less then 2×10-8
■ Rapid changing out level range is from -80dBm to -149.9dBm.
■ Doppler frequency (1.57542GHz±10kHz) can be digital-set and can be adjustable in 0.1Hz.
■ A reference clock (10MHz) input/output terminals and a 1pps signal input/ (Output on option) terminals are equipped for external synchronizing.
■ The output terminal is DC-cut to able to connect to the powered antenna cable.
■ All NAVI data preset by GP-IB line and also RS-232C.
■ An automatic Z-count increment function is equipped so as to synchronized with real time clock.
■ The front panel operation can be programmed by GP-IB and RS-232C.
* The application program is attached.
■ Digital standard signal generator adopting the DDS method
Owing to the adoption of the DDS method, this MSG-2280 signal generates precise RF frequencies over a wide range of 100kHz to 170MHz in addition to AF frequencies by its built-in AF oscillator.
■ 10ms settling time
Adopting the DDS method ensures a high settling speed of frequencies and the response time is shorter than 10ms.
■ 100kHz to 170MHz wide band
Its frequency range extends over a wide range from 100kHz to 170MHz covering the AM band, FM band, and weather band.
■ Electronic attenuator
Its highly reliable electronic attenuator ensures a long-time continuous use, and the output level (-20dBµV to 126dBµV) can be switched quickly and precisely.
■ An FM stereo modulator is built-in
This unit comprises MONO, MAIN, L, R, SUB, and OFF modulation modes and its L/R separation exceeds 60dB.
■ Multi-functions
This unit can execute AM/FM simultaneous modulation for testing the suppression degree of multi-pass signals.
Its output AGC and limiting sensitivity can be read directly by its ΔdB function.
It can also read the detuning frequency, etc. easily and directly by its ΔF function.Pre-emphasis can be set to OFF, 25µs, 50µs, and 75µs.
■ Memory function and interface
Data of 100 points can be stored and recall out by its memory function.This unit is also provided with GP-IB, RS-232C, and EXTI/O external control interfaces as its standard equipment so that it can be converted into an automatic measuring system.
规格
|
Frequency Section |
|
Range |
100kHz to 170MHz |
|
LED display/Resolution |
7digits/100Hz (Δf function) |
|
Settling time |
Less than 10ms |
|
Accuracy |
±5×10-6 |
|
Output Section |
|
Output Range |
-20dBµV to 126dBµV (EFM) |
|
LED display/Resolution |
4-digits/0.1dB |
|
Accuracy |
±1.5dB |
|
Leveling |
±1.5dB |
|
Output impedance |
50Ω, VSWR < 1.3 |
|
Unit |
dBµV [EFM] |
|
Spurious signals |
|
• 2/3 rd Harmonic sprious |
< -30dB |
|
• Non-Harmonic sprious |
< -40dB |
|
Attenuataor |
Electronic attenuator(Semiconductor) |
|
RF leakage |
Will not effect output level performance when 0dBµV is set 0dBµ |
|
Modulation Section |
|
< FM Data > |
|
Deviation range |
0 to 135kHz |
|
Max.FM deviation |
Fo≦35MHz,Up to 25% of carrier frequency |
|
LED display/Resolution |
3-digit / 0.1kHz |
|
Modulation accuracy |
10.7MHz±1MHz (76MHz to 108MHz)
±(setting×0.1 + 0.5)kHz
0.3MHz to 170MHz
±(setting×0.1 + 1) kHz |
|
Internal modulation |
|
• Frequency |
10Hz to 100kHz |
|
• Accuracy |
±0.1% |
|
Ext.modulation |
|
• Freq. range |
20Hz to 100kHz |
|
• Impedance |
10kΩ unbal |
|
• Input voltage |
1Vp-p ±2% |
|
• Distortion |
≦0.05% in 10.7MHz±1MHz
76MHz to 108MHz
≦0.1% in 0.3MHz to 170MHz
(With AF 1kHz at 75kHz dev. in BW 50 to 20kHz with 50µs de-emphasis applied) |
|
• Residual FM |
< -80dB
(In demod.Band,80 to 20kHz with de-emphasis 50µS applied) |
|
• Incidental AM |
≦0.5%
(10.7MHz±1MHz,76MHz to 108MHz with AF 1kHz and FM 75kHz deviation) |
|
<AM Data> |
|
Distortion range |
20 to 15kHz |
|
Modulation range |
0% to 100% (lower than 120dBµV)
0% to 30% (Higher than 120dBµV) |
|
LED Display/Resolution |
3-digits/0.1% |
|
Accuracy |
±(setting×0.1+1)% (0.4MHz to 1.7MHz≦80%)
±(setting×0.1+2)% (0.15MHz to 170MHz≦80%) |
|
Internal modulation |
|
• Frequency |
10 to 20kHz |
|
• Accuracy |
±0.1% |
|
Ext.modulation |
|
• Freq. range |
20Hz to 20kHz (1kHz reference) |
|
• Freq. response |
±1dB |
|
• Impedance |
10kΩ (unbal) |
|
• Input Voltage |
1Vp-p ±2% |
|
• Distortion |
|
RF Freq.
(MHz) |
Modulation |
|
0 to 30% |
30.1 to 60% |
60.1 to 80% |
|
0.4 to 1.7 |
≦0.5% |
≦1.5% |
≦3.0% |
|
0.15 to 170 |
≦1.5% |
≦3.0% |
≦5.0% | | |
|
Residual AM |
0.5% (in demod.Band,80Hz to 15kHz) |
|
Incidental FM |
≦75Hz (0.4MHz to 1.7MHz)
≦150Hz (0.15MHz to 170MHz) |
|
FM Stereo Modulation |
|
Separation |
≧55dB
(With AF 400Hz to 1kHz at 100% modulation in 76MHz to 108MHz)
≧40dB (With 50Hz to 15kHz) |
|
Frequency response |
≦±1dB (20Hz to 15kHz with AF 1kHz reference) |
|
Composite signal |
|
• Output |
5Vp-p±10% (FM-MONO, 100% MOD) |
|
• Setting range |
0 to 135% (75kHz/100%) |
|
• Setting accuracy |
±1% |
|
• Impedance |
600Ω |
|
Distortion |
≦0.05% (100% MOD.) |
|
S/N |
≧76dB |
|
38kHz |
|
• Leakage |
≦-50dB |
|
Pilot signal |
|
• Frequency |
19kHz±1Hz |
|
• Output |
1Vrms±10% (Fixed) |
|
• Impedance |
1kΩ |
|
• Setting range |
0 to 15% in 0.1step |
|
Modulation Mode |
L=R / L / R / L= -R / MONO / OFF |
|
Intenal modulation |
|
• Frequency range |
20 to 15kHz |
|
• Frequency response |
±1dB |
|
Pre-emphasis |
|
Setting range |
25µs / 50µs / 75µs / OFF |
|
Interface Function |
|
Parallel interface |
GP-IB complying with an IEEE std.488-1975 |
|
Serial intreface |
RS-232C |
|
Ext.control interface (I/O) |
TTL level |
|
General Data |
|
Operating Temperature range |
0ºC to +40ºC |
|
Performance guarantee |
+10ºC to +35ºC |
|
Power requirements |
AC100 to 240V±10%, 50/60Hz, 42VA |
|
Dimensions |
420 (W) × 115 (H) × 370 (D) mm |
|
Weight |
Approx. 7.5kg | |
