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 calibrastion
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
tuner is priced in the udget range, but is built with advanced 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 desoign, yield high sensitivity and a high
interference rejection capabaility.
The intermediate
frequency stage
utilizes Sony's new
uni-phase (F filters, providing high selectivity and, at the same time low
audio distortion.
And for excellent FM
stereo, the multiplex stageis 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.
Overal FM
performance rating include a capture ratio of 1,0 dB, an S/N 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-2950 SD 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 etter than everage 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 clea,
human-engineered front panel provides ease of use - in both tuning and control.
Specifications:
FM Tuner Section
Antenna
Terminals: 300 Ω (balanced), 75 Ω
(unbalanced)
Usable Sensitivity
(IHF '58): 2,0 µV
50 dB Quieting
Sensitivity:
Mono : 4,0 µV
Stereo : 50 µV
Signal-to-Noise
Ratio:
Mono : 73 dB
Stereo : 68 dB
Capture Ratio: 1,0 dB
Selectivity: 50 dB
Image
Rejection: 45 dB
IF Rejection: 90 dB
Spurious
Rejection: 75 dB
AM Suppression: 54 dB
Total Harmonic
Distortion:
Mono :
At 100 Hz : 0,2%
At 1 kHz : 0,2%
At 10 kHz : 0,2%
Stereo:
At 100 Hz : 0,3%
At 1 kHz : 0,3%
At 10 kHz : 0,6%
IM Distortion:
Mono : 0,2%
Stereo : 0,3%
Frequency
Response: 30 Hz - 15 kHz (+0.5 -1,5 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: 250 µV/m (w/built-in antenna); 100 µV
(w/ext.antenna)
Selectivity: 35 dB at 10 kHz
Signal-to-Noise
Ratio: 50 dB at 50 mV/m
Image
Rejection: 40 dB at 1,000 kHz
Total Harmonic
Distortion: 0,5% at 50 mV/m, 400 Hz
General Section
Output
Level/Impedance (at 100% modulation)
Audio (Fixed): 750 mV/5 k Ω
Discriminator: 150 mV/2,5 k Ω
Semiconductors: 4 ICs, 1 FET, 17 Transistors, 14 Diodes
Power
Requirement: AC 120V, 220, 240 V 50/60
Hz
Power
Consumption: 26 W
Dimensions (W x H x
D): 390 x 145 x 310 mm (15-3/8" x
5-3/4" x 12-1/4")
Weight: 6 kg (13 lbs 4 oz)