FM
Stereo/FM-AM Tuner
Features:
FET
front-end
New,
computer-designed uni-phase IF filters
Phase-Locked-Loop
IC stereo MPX stage
Dolby noise
reduction system for decoding Dolbyized FM broadcasts, and Dolby indicator
light
Center
station and signal strength tuning meters
Smooth
flywheel tuning action
Wide,
frequency linear dial calibration
FM
interstation muting
FM
discriminator output for future 4-channel FM
High blend
switch
Automatic
mono/stereo switching and stereo indicator light
Wooden side
panels included
Sony's new
ST-2950SD yuner is prieced in the budget range, but is built with advdnce
electronics that mean high performance. For a very modest expenditure, FM
listeners can enjoy the quality sound of the ST-2950SD, as well as the
convenience of a built-in Dolby decoding system for FM
FM Section
The unit's
FM front-end electronics, with FET design, yield high sensitivity and a high
interference rejection capability. The intermediate frequency stage utilizes
Sony's new uni-phase IF filters, providing high selectivity and, at the same
time, low audio distortion. And for excellent FM stereo, the multiplex stage is
built with a Phase-Locked-Loop IC, providing low distortion decoding and high
stereo separation. At least 35 dB of separation is maintained at high and low
ends of the frequency spectrum, while 40 dB is achieved at midrange
frequencies. Overall FM performance ratings include a capture ratio of 1,0 dB ,
an Signal-to-Noise Ratio of almost 70 dB in stereo and more than acceptably
good distortion figures.
For
listeners who want an uncomplicated means of taking advantage of Dolbyized FM
programs, the ST-2950SD provides simple, one-step decoding. When stations send
out Dolbyized broadcasts, all that's required for decoding is to press the
unit's Dolby button - no need to use an add-on noise reduction unit, and no
need to be concerned about changing FM de-emphasis.
AM Section
A triple AM
AGC circuit is just one aspect of AM design that makes the ST-2950SD produce
far better than average AM sound. Hi-fi oriented ears will be able to hear
AM-only programs without the usual levels of irritating interference.
Tuning
Tuning the
ST-2950SD is simple and accurate, with ultra-smooth flywheel tuning action,
frequency linear dial calibration and highly readable tuning meters to help
zero in on the station. FM interstation muting cuts out noise, and a clean,
human-engineered front panel provides ease of use-in both tuning and control.
Specifiactions
FM Tuner
Section
Antenna Terminals: 300 Ω balanceed; 75 Ω unbalanced
Usable
sSensitivity (IHF '58}: 2,0 µV
50 dB
Quieting Sensitivity: 4,0 µV
[mono] 50 µV [stereo]
Signal-to-Noise
Ratio: 73 dB [mono] 68 dB [stereo]
Capture
ratio: 1,0 dB
Selectivity: 50 dB
Image
Rejection: 45 dB
IF
Rejection: 90 dB
Spurious
Rejection: 75 dB
AM
Suppression: 54 dB
Harmonic
Distortion
At 100 Hz
: 0,2% [mono] 0,3% [stereo]
At 1 kHz
: 0,2% [mono] 0,3% [stereo]
At 10 kHz
: 0,2% [mono] 0,6% [stereo]
IM
Distortion: 0,2% [mono] 0,3% [stereo]
Frequency
Response: 30 Hz - 15 kHz +0,5 -1,0 dB
Stereo
Separation:
At 100 Hz
: -35 dB
At 1 kHz
: -40 dB
At 10 kHz
: -35 dB
RF
Intermodulation: 60 dB
Subcarrier
Product Ratio: 60 dB
SCA
Suppression: 60 dB
AM Tuner
Section
Antenna: built-in ferrite bar antenna w/terminal for
ext.wire
Sensitivity:
w/Built-in
Antenna : 250 µV/m
w/ext.
Antenna : 100 µV
Selectivity: 35 dB at 10 kHz
Signal-to-Noise
Ratio 50 dB at 50 mV/m
Image
Rejection: 40 dB at 1 kHz
Harmonic
Distortion: 0,5% at 50 mV/m, 400 Hz
General
Output
Level/Impedance ((at 100% modulation)
Audio (Fixed) : 750 mV/5 k Ω
Discriminator: 150 mV/2,5 k Ω
Semiconductors: 4 IC's; 1 FET; 17 Transistors; 14 Diodes
Power
Requirements" AC 120 V - 240 V
50/60 Hz
Dimensions
(W x H x D): 390 x 145 x 310 mm
(15-3/8" x 4-3/4" x 12-1/4")
Weight: 6 kg (13 lbs 4 oz)
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