FM/AM Stereo
Tuner
There are
many high fidelity enthusiasts who seek the quality and control features of a
separate tuner, but are put off by the prohibitive prices of
"separates". For them, the ST-7300 is the perfect answer. It yields a
flat frequency response curve from 20 Hz to 15 kHz, with a low 0,4% total
harmonic distortion in stereo, excellent sensitivity and selectivity figures,
and a 75 dB signal-to-noise ratio. The ST-7300 demonstarates the high degree of
performance that can be enjoyed at a very reasonable cost.
Test Signal
Generator for Perfect FM Recording Level Settings
Accurate
level adjustments are critical in FM taping. The St-7300 eliminates the guess
work with a built-in test signal generator whose output corresponds to 50% of
FM signal modulation. Simply switch on the 440 Hz pure sine wave generator and
set the tape recording level.
Direct
Antenna Connections
The antenna
terminals are connected directly to the circuit board of the front end, without
intervening wires. The results are an extremely good sensitivity, and excellent
spurious and image rejection.
3-Ganged
Capacitor FM Front End
The high S/N
ratio and sensitivity of the ST-7300 are due in large measure to the FET and
3-ganged capacitor used in the first stage of the front end.
Flat
frequency Response Over A Wide Spectrum,
20 Hz - 15 kHz (+0,2 dB, -1,0 dB)
The
remarkably flat frequency response curve over a broad range of frequencies is
made possible by use of Chebyshev-characteristic low pass filters. These
filters also attenuate the 19 kHz pilot signal to a level at which it will not
interfere with the audio signal.
Flat Group
Delay Filters in IF Stage
Three
2-element flat group delay ceramic filters in IF stage contribute to the
tuner's excellent sound fidelity as evidenced by a total harmonic distortion of
0,4% (stereo), and S/N of 75 dB. Five differential amplifiers give high gain
and an impressive selectivity rating of 75 dB (IHF).
Two Tuning
Meters
The
zero-center meter indicates exact center of channel tuning on FM. The signal
strength meter works for both AM and FM. When used together, these two meters
make FM tuning a simple matter. Quadrature demodulation by an integrated
circuit assures meter linearity right up to the 60 dB (1000 µV) input level.
PLL FM
MPX Decoder
A phase
locked loop provides the 38 kHz time switching signal by which the two channels
of FM MPX broadcasts are decoded. The phase comparator and feedback techniques
employed interlock both frequency and phase of input and output signals to
provide clearly defined channel separation despite temperature and humidity
changes.
Sensitivity
1.0 µV at S/N 20 dB (75 ohms)
The
ST-7300 offers a truly amazing sensitivity; full 1.0 µV at ±40 kHz deviation.
Even more important, 46 dB quieting level can be reached with a signal strength
of 19 µV (75 Ω) in stereo.
When
using an outdoor antenna with the ST-7300 a coaxial cable (75 Ω impedance) is recommended.
Specifications
FM Tuner
Section
Frequency
Range: 88 - 108 MHz
Sensitivity
(±40 kHz deviation)
S/N 30
dB : 2,0 µV (300 Ω), 1,4 µV (75 Ω)
S/N 26
dB : 1,8 µV (300 Ω), 1,2 µV (75 Ω)
S/N 20
dB : 1,5 µV (300 Ω), 1,0 µV (75 Ω)
IHF Usable
Sensitivity : 2,0 µV
S/N 46
dB quieting Sensitivity: 19 µV (75 Ω, stereo)
Total
Harmonic Distortion:
Mono :
0,2% at 100
Hz,
0,2% at 1
kHz
0,5% at 100
Hz
Stereo :
0,4% at 100
Hz,
0,4% at 1
kHz,
0,5% at 6
kHz
Signal-to
Noise (±40 kHz Deviation)
Mono : 69 dB (75 dB,IHF)
Stereo
: 65 dB ,( 70 dB IHF)
Frequency
Response: 20 Hz - 15 kHz (+0,2 dB, -1,0
dB)
Alternate
Channel Selectivity: 75 dB
Capture
Ratio: 1 dB
Image
Rejection at 98 MHz: 55 dB
IF Rejection
at 98 MHz: 82 dB
Spurious
Response Rejection at 98 MHz: 80 dB
AM
Suppression: 55 dB
Stereo
Separation: 45 dB (1 kHz); 35 dB (10 kHz)
Leak
Carrier: -60 dB (19 kHz, 38 kHz)
Channel
Balance (250 Hz - 6300 Hz ) ±1,5 dB
Limiting
Point: 1,2 µV
Bandwith:
iF Amplifier
: 200 Hz
FM
Demodulator: 820 kHz
Antenna
Terminals: 300 Ω, 75 Ω
AM Tuner
Section
Frequency
Range: 525 - 1605 kHz
Sensitivity
30 µV, 260 µV / metr
Selectivity: 20 dB
Image
Rejection at 1000 Hz: 45 dB
IF Rejection
at 1000 kHz: 40 dB
Output
Voltage and Impedance: 0,5V / 4,7 k Ω
Power
consumption: 11 W
Power
Supply: 50/60 Hz; 110/120/220/240
Dimensions
(W x H x D): 410 x 139 x 317 mm
(16-5/32" x 5-15/32" x 12-15/32")
Weight: 5,1
kg (11,2 lbs)