Sony ST 4950 Brochure

Page 1

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ST4950 FM STEREO/FM-AM TUNER

Features
I MOS FETtront-end

I Computer designed phase-linear solid-state ceramic
filters in IF stage

I Phase-Locked-Loop MPX stage
I FM interstation muting

I Defeatable AFC

I High blend switch

_ FM STEREO/FMAM TUNER

SIGNAL
\
I 3 3 n »
Vuvinm

FM

AM

I Center station meter. plus signal strength meter for accurate
tuning with multipath indication

I LED tuning pointer and station indicator

I Variable output level control to match tuner with other
program sources

I Automatic mono/stereo switching and stereo indicator light

iSTs

m TM

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SPECIFICATIONS

FM TUNER SECTION

Sensitivity. lHF:1.9/4V

S/N ratlo: 70dB

Capture ratio: 1,0dB

Selectivity, IHF: BOdB $3,123.35. jiggle" .n
Image reiecllon: 70dE antenna idotv externall ailitenna
IF rejection: iOOdB SIN rati OdB

Spurious rejection: tOOdB Harmonic distortion: 05%

AM suppression: 53dB

Harmonic distortion: Mono-0.15% GENERAL SPECIFICATIONS

at 400Hz. 100% modulation Semiconductors: 3 I05, 4 FETs,
Stereo-0.3% at 400Hz. 100% 23 tran5lstors. 20 diodes, 1 LED
modulation Power requirements:
FM stereo separation: Better than AC 120V: SOHZ- 22W
40dB at 400Hz Dimensions:
FM irequency response: 5% x16V."W X 13D
20Hz-15kHz, 1- 1dB Weight: 17 lbs.
The ST-4950s capacity for crystal clear reception is numeri- mi: 32:2? it??? $343: (Trgflrgol.
cally defined by ils exceptional spec ratings. To give a fuller
idea of how Sony's advanced engineering concepts have 5, NY ,_ ,.,.,..,,,,.,,

achieved an overall level of excellence, major circuitry and
control features are described below.

FM Section The MOS FET front-end (RF and mixer stages) of
the FM tuner is another ingredient, leading to good sensitivity,
very high overload capability, and high imagehigh cross mod-
ulation rejection. The IF amplifier section, combined with the

inherently quiet front-end, insures high selectivity and long T [a T 9 Nil
term stability, with permanently aligned solid-state filters, and |

. l - - . MULTIPATH SWITCN F
a Wide band-pass characteristic With extremely linear phase Mm Wm 523:32';

response The result is a capture ratio of only i .OdB, overall AFCSWCH
selectivity of 80dB, and an S/N ratio of 70dB,

FM stereo is also outstanding. The PLL circuit along with the
linear phase wide band characteristic and response of IF 0 EFM'NL FM AN:5E;::"XL WY 22323511532 m
stage assures high stability, excellent stereo separation and ream'ms VARIABLElnurPuYs

low distortion in the MPX stage.

AM Section The AM tuners IF amplifier with high selectivity
solid-state filters and automatic gain control operate to give
the ST-4950 good sensitivity and S/N ratings, with low har-
monic and IM distortion. ST~4950 listeners will be surprised by
the remarkably clear AM performance

Tuning Accurate tuning is essential for pure FM sound, but
on today's crowded FM dial it's not always a simple opera- .,
tion. The 814950 provides listeners with an accurate and mm IERWEC'N" LEVEL ADJUST mzpowurs Ac POWER
convenient method oftuning, offering easy to read meters for WM scan
center station and signal strength indication plus multipath

indication facility. This combination, along with LED tuning

pointer/station indication. the long frequency linear dial

scale, smooth flywheel tuning action and highly effective FM

interstation muting, makes tuning simple and precise. AFC

can be switched off when desired.

SONY;

CORPORATION OF AMERICA
9 West 57th Street, New York, NY. 10019

I/76 PRINTED IN U.S.A.