MU-25-4 FM Plugin unit , MSG-2520 FM-AM Signal Generator
 
 

 

MSG-2520 is designed for use on the production line for AM-FM radios and TV sound receivers. It is a small-scale version of a "Centralized signal generating system" in which up to eight discrete test frequencies can be generated with oscillator plug-in units.

FEATURES

AM and FM bands covered with five oscillator plug-in units (total of eight can be installed) in any combination. Data are given in the specifications.
Carrier frequency in each unit settable to six digits and memorized using a store switch. With an internal microcomputer, the frequency of each unit is controlled with a reference crystal oscillator. High accuracy and stability are assured.
The reference output level of each unit is 100dBµ and adjustable in the +1 to -6dB range.
Modulation applicable, internal or external, for 50% AM and 0 to 100kHz deviation for FM.
In addition to outputs from installed units, two external signals can be connected for additional mixed outputs.
Back-up battery included for storing memorized carrier frequencies at power off condition.
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SPECIFICATIONS
MAIN FRAME (MSG-2520)
Signal Generation Up to eight frequencies with AM and FM oscillator plug-in units
Frequency Display Max. 6 digits
Frequency Accuracy ±2×10-5
Frequency Resolution 1kHz : 100kHz to 30MHz
10kH z: 60MHz to 110MHz
10kH z: TV sound frequency
Frequency Setting

Each plug-in unit frequency can be set up or down at the selected digit order

Output Signals Four outputs, mixed with eight (max.) signals. 100dBµ
Source Impedance 50Ω, VSWR < 1.2
Spurious Signals < -40dB (at eight signal mixing)
External Signal Input
• Frequency Range Two signals in the 0.1 to 110MHz range and TV sound frequency bands
• Input Level 100mVrms, max.
• Impedance 50Ω, VSWR < 1.2
Modulation
• Internal 400Hz and 1000Hz ±5%
• External

Input Impedance : approx. 10kΩ unbalanced
Input Voltage : 2Vrms at maximum indication

Power Requirements AC 100V, 115V, 215V or 230V ±10%, 50VA
Dimensions Approx. 420 (W) × 165(H) × 450 (D)mm
Weight Approx. 12kg

 AM PLUG-IN UNITS (MU-25-1, MU-25-2)
Frequency Range
• MU-25-1 100Hz to 1700kHz
• MU-25-2 1.0Hz to 30MHz
Frequency Accuracy ±2×10-5
Frequency Resolution 1kHz
Output Level 100dBµ at 0dB indication; adjustable range, +1 to -6dB
Spurious Signals < -40dB (at eight signal mixing)
Residual FM > 66dB at 75kHz deviation (de-emphasis 50µs)
Residual AM > 50dB at 30% modulation
Modulation Range 0 to 100kHz deviation, ±10% of full scale
Modulation Distortion In demodulated band, 20Hz to 20kHz; <0.05% at 75kHz deviation
External Modulation 30kHz to 100kHz, response within ±1dB
Incidental FM < 200Hz at 30% modulation
Dimensions Approx. 47 (W) × 96 (H) × 265 (D) mm
Weight Approx. 700g

 FM PLUG-IN UNIT (MU-25-3, MU-25-4, MU-25-5, MU-25-7)
Frequency Range
• MU-25-3 60 to 76MHz
• MU-25-4 75 to 91MHz
• MU-25-5 87 to 110MHz
• MU-25-7 TV sound frequency bands
Frequency Accuracy ±2×10 -5
Frequency Resolution 10kHz
Output Level 100dBµ at 0dB indication; adjustable range, +1 to -6dB
Spurious Signal < -40dB (at eight signal mixing)
Residual FM > 76dB at 75kHz deviation (de-emphasis at 50µs)
Residual AM < 0.1%
Modulation Range 0 to 100kHz deviation, ±10% of full scale
Modulation Distortion In demodulated band, 20Hz to 20kHz; <0.05% at 75kHz deviation
External Modulation 30kHz to 100kHz, response within ±1dB
Incidental FM 0.5% at 22.5kHz deviation
Dimensions Approx. 47 (W) × 96 (H) × 265 (D) mm
Weight Approx. 700g
 

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