MSG-2280 FM-AM Standard Signal Generator
 
 

 

MSG-2280 high-performance digital standard signal generator adopts the DDS (Direct Digital Synthesizer) method. The wide frequency of this unit ranges from 100kHz to 170MHz covering the weather band, and it is provided with a built-in FM stereo modulator, so that this unit is the most suitable for adjusting and inspecting multi-band receivers.

FEATURES
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
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SPECIFICATIONS
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 (EMF)
LED display/Resolution 4-digits/0.1dB
Accuracy ±1.5dB
Leveling ±1.5dB
Output impedance 50Ω, VSWR < 1.3
Unit dBµV [EMF]
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 0% to 100% (lower than 120dBµV)
0% to 30% (Higher than 120dBµV)
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
* Specifications are subject to change without notice.
 
 

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