SONY ST-JX520 FM Stereo / FM AM Radio Tuner

A hi-fi AM/FM stereo Quartz Lock Digital Synthesizer tuner with a LCD digital Band/Frequency display, housed in a black metal case. 

With press buttons for Tuning down and Tuning up, Band (FM, AM), Memory, Stereo Muting, Stereo indicator and 12 keys for 6 FM and 6 AM preset radio stations. 

The US model also has a press button for Antenna selection. On the back, terminals for AM and FM antennae, RCA phono line output sockets, AC mains outlet 

(500W max) and connectors for Function Control (for connection to the SYNC connector on other components) and Control S In/Out (for system remote control). 

Specification  

• FM tuner section
• Tuning range 87.5MHz - 108MHz
• Antenna terminals 75Ω unbalanced, 300Ω balanced (not US model)
• Sensitivity at 50dB quieting 16.1dBf, 1.8µV (mono), 37.9dBf, 21µV (stereo)
• Usable sensitivity 10.3dBf, 0.9µV (IHF)
• Signal/Noise ratio(at 75kHz deviation) 82dB (mono), 76dB (stereo)
• Harmonic distortion at 1kHz 0.1% (mono), 0.25% (stereo)
• IM distortion 0.1% (mono), 0.25% (stereo)
• Separation at 1kHz 50dB
• Frequency response 30Hz - 15kHz +0.2dB,-1.8dB
• Selectivity at 400kHz 75dB
• Capture ratio 1.0dB
• AM suppression ratio 55dB
• Image response ratio 45dB
• IF response ratio 90dB
• Spurious response ratio 75dB
• Output level/impedance at 75kHz deviation 750mV, 4.7kΩ
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• AM tuner section
• Tuning range 531 - 1,602kHz (9kHz step)
• 530 - 1,610kHz (10kHz step)
• Antenna Layout-free AM antenna
• External antenna terminal
• Usable sensitivity  
• Layout-tree AM antenna 300µV/m (at 999 or 1,000kHz)
• Signal/Noise ratio 50dB (50mV/m)
• Harmonic distortion 0.3% (at 50mV/m, 400Hz)
• Selectivity 35dB (9kHz), 38dB (10kHz)
• US Model  /  120V AC 60Hz