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What is stereo?




There are now two system of high fidelity, monophonic (monaural) and stereophonic. Monophonic is a system that starts from one microphone and is fed through a single high fidelity set. Stereophonic is a double system. Two separate microphones are placed at different sides of the orchestra and two different systems are used to keep the two signals or channels separated. Two separate speakers are used, placed on different sides of you room. Stereo is much like 3-D photography, two slightly different sound reach your ears giving you a new dimension in sound.



H.H. Scott '59





Optonica ST-5200 tuner


Optonica ST-5200
FM/LW/MW Stereo Synthesizer  Tuner with Microprocessor Tuning System
The synthesizer tuning system employed in this 3-band stereo tuner minimizes error and drift by breaking down a reference frequency and using it to synthesize the tuning frequency. As aresult, extremely stable, highly accurate reception is ensured. An easy-to-read digital frequency tuning display indicates the tuned frequency to enable pinpoint tuning accuracy. The auto search tuning system allows the synthesizer to be set to stop automatically at the nearest station in the chosen direction for effortless tuning. 10 presettable station memories can be set for one-touch tuning of favourite station. LED tuning meters facilitate pinpoint tuning accuracy and, when used with the FM air check calibrator, allow simplified setting of deck input levels for FM recordings. Soft-touch controls assure smooth operation.

Specifications
FM Section
Frequency Range:  87,5 - 108 MHz
Antenna Input:  75 Ω unbalanced; 300 Ω balanced
Synthesizer Tuner:  yes
Span Frequency:  0,05 MHz
Automatic Tuning:  yes
Pre-Setting Station;  FM/AM total 10
Sensitivity :
Mono (DIN 40 kHz dev. Signal-to-Noise 26 dB):  1,3 µV (75 Ω); 1,6 µV (300 Ω)
Stereo (DIN 40 kHz dev. Signal-to-Noise 46 dB):  39 µV (75 Ω); 45 µV (300 Ω)
Total Harmonic Distortion (1 kHz, 40 kHz dev.):
Mono :  0,2%
Stereo :  0,3%
Signal-to-Noise Ratio (1mV, 40 kHz dev. 1 kHz):
Mono :  66 dB
Stereo : 61 dB
Frequency Response:  30 Hz - 15 kHz (±3 dB)
Image Rejection (at 98 MHz):  75 dB
IF Rejection(at 98 MHz):  75 dB
AM Suppression (modulated 30%, AM by 1 kHz and 100% FM by 400 Hz):  50 dB
Selectivity (±300 kHz, 40 kHz dev.):  40 dB (normal)
Capture Ratio:  2,5 dB (normal)
Subcarrier Suppression:  45 dB
Stereo Separation:
At 1 kHz :  40 dB
At 10 kHz :  30 dB
AM Section
Frequency Range: 
MW :  522 - 1610 kHz
LW :  150 - 372 kHz
Antenna:  Built-in ferrite bar antenna; External Antenna terminal
Synthesizer Tuner:  yes
Span Frequency:  9 kHz
Automatic Tuning:  yes
Pre-Setting Station:  FM/AM total 10
Sensitivity
MW :  350 µV/m (Signal-to-Noise 20 dB, 1000 kHz)
LW :  350 µV/m (Signal-to-Noise 10 dB, 220 kHz)
Audio Section
FM Output (40 kHz dev.):  350 mV (fixed)
AM Output (30% mod.):  200 mV (fixed)
General
Power Sourece:  110/220/240 V 50/60 Hz AC
Power Consumption:  18 W (220 V)
Dimensions (W x H x D):  430 x 75 x 393 mm
Weight:  5,0 kg


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