Sony ST-JX500
Direct Comparator AM/FM Tuner
Sony's Top-OF-Line Quartz Frequency Synthesis tuner
Features:
Quartz frequency synthesis tuning
Direct comparator circuitry
Ten station memory presets
Multiprocess memory
Memory Scan tuning
Auto Sweep tuning
Key Selling Feature - Direct Comparator
The new digital sources are creating the possibility for superior broadcasts and the need for superior tuners. For this reason, the Sony ST-JX500 was designed to incredibly high standards. Key to the tuner's high performance is Sony's unique Direct Comparator. Conventional quartz frequency synthesis designs compare the local oscillator frequency with a reference frequency found in the audible range. This produces audible range background noise. Sony's Direct Comparator design accepts the local oscillator frequency directly. this permits the comparator frequency to be raised above the audible range - producing a starting reduction in noise.
Key Demonstration
Check that your FM reception is adequate. Demonstrate the tuner, talking the consumer through the benefits of Direct Comparator. Then make sure to demonstrate a few of the convenience features. Show how Auto Sweep takes a sample of all the available stations to indicate every station that can be received. Then, press Memory Scan (you've set all the station presets already), and let it scan through the presets, providing the customer with a four second sample of each one.
Convenience Features
Microprocessor tuning with manual "step" and automatic tuning up and down
Ten station memory presets with random assignment if AM and FM stations
Four station programming permits recording four different stations in a programmed sequence with an accessory timer
Multi-process memory stores the frequency, mono/stereo mode, and muting condition of each preset station
Memory Scan provides a four second sample of each preset station
Auto Sweep provides a four second sample of each station on the dial
Preset station indicator cards to show memorized stations
Fluorescent multi-function display indicates received frequency, muting mode, FM or AM reception, tuning mode
Five-bar, FL signal-strength indicator for optimum antenna positioning
Technology Features
Quartz frequency synthesis; the most accurate, most convenient tuning system known
Sony's exclusive Direct Comparator provides exceptionally quiet FM reception
Extraordinary FM s/n of 90 dB in mono , 84 dB in stereo
Front-end Sensitivity equal to a 4-gang variable capacitor, 6 element filter and high reception ability by Antibirdy Filter
Built-in lithium battery maintains preset station memory
75 Ohm coaxial input connector provided
Specifications
FM Tuner Section
Useable Sensitivity (Mono): 10,3 dBf (1,8 µV )
50 dB Quieting Sensitivity
Mono: 16,1 dBf (3,5 µV )
Stereo : 38,9 dBf (43 µV )
Signal-to-Noise-Ratio:
Mono : 90 dB
Stereo : 84 dB
Total harmonic Distortion: at 1 kHz
Mono : 0,08%
Stereo : 0,1%
Intermodulation Distortion
Mono : 0,08%
Stereo : 0,1%
Frequency Response: 30 Hz - 15,000 Hz +0,5 dB -2,0 dB
Stereo Separation: 50 dB at 1 kHz
Alternate Channel Selectivity (400 Hz): 80 dB
Capture Ratio: 1,0 dB
AM Suppression: 60 dB
Image Rejection: 80 dB
Spurious Response: 100 dB
IF Response: 90 dB
RF Intermodulation (IHF): 74 dB
Muting/Tuning Threshold: 25 dBf
AM Tuner Section
Quieting Sensitivity:
Built-in Antenna : 200 µV/m
External Antenna : 100 µV
Signal-to-Noise-Ratio: 55 dB at 50 mV.m
Total harmonic Distortion: 0,3% at 50 mV/m, 400 Hz
Selectivity (10 kHz): 38 dB
Image Rejection: 42 dB
General
Output Level: 750 mV
Output Impedance: 4,7 k Ω
Power Requirements: AC 120 Volts, 50 Hz
Power Consumption: 11 Watts
Dimensions (W x H x D): 430 x 55 x 300 mm (17" x 2-1/4" x 11-7/8")
Weight (net): 3,1 kg (6 lb 14 oz)
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