Audio Database

TU-450
Commentary

An FM/AM tuner equipped with 16 station preset functions designed with the theme of quality and usability as well as focusing on basic performance.

It employs a digital synthesizer system that allows easy channel selection and accurate tuning accuracy.

16 stations are covered by the use of 8 tuning keys and shift keys.
The "4-way tuning mechanism" has been adopted for the memory mechanism. It enables one touch random preset tuning that directly calls the desired station from among the 16 stored stations, automatic tuning that automatically finds radio waves and tunes, manual tuning that receives broadcasting stations with weak radio waves, and last channel memory tuning that automatically selects the last station received.

For accurate tuning, the PLL comparison frequency is set to 25 kHz, which is out of the audible band. In addition, a static control display is adopted to eliminate beat and noise in the audio band.

The front end section is designed with analog varactor diodes equivalent to 3 series and J-FET.
A ceramic filter with constant amplitude and constant delay characteristics is used for the IF stage.

It is equipped with MPX-NR which automatically reduces noise when receiving FM stereo with weak signal.
This function can be turned ON/OFF.

The AM section employs a two stage 3-terminal high-selectivity ceramic filter, an LC filter, and a low-impedance loop antenna that is resistant to fluorescent light noise.

It has a memory backup function of about 30 days.

Model Rating
Type FM/AM Tuner
FM Tuner Section
Receiving frequency 76 to 90 MHz
Intermediate frequency 10.7MHz
Antenna terminal Terminal type
75 Ω unbalanced, 300 Ω balanced
Practical sensitivity 11.2dBf
SN ratio 50 dB sensitivity stereo:38.5dBf
mono:21.6dBf
Execution selectivity 50 dB (± 400 kHz)
Capture ratio 1.5dB
IF interference ratio 85dB
Image interference ratio 45dB
AM suppression ratio 50dB
Muting operating limit level
Stereo automatic switching operation level
-94.8dB(mW)
Frequency characteristic 20 Hz to 15 kHz, + 0.2 -1.5 dB
Corrected SN ratio stereo:76dB
mono:82dB
Total harmonic distortion rate (1 kHz) Stereo : 0.15% at 90% modulation
Mono : 0.08% at 100% modulation
Separability 40dB(1kHz)
Output level 0.6 v (at 100% modulation)
<AM Tuner Section>
Receiving frequency 522 to 1,629 kHz
Intermediate frequency 450kHz
Antenna terminal Terminal type (loop antenna included)
Practical sensitivity 18 μ V (300 μ V/m)
One signal selectivity 35 dB (± 9 kHz)
IF interference ratio 60dB
Image interference ratio 45dB
Signal-to-noise ratio 52dB
Total harmonic distortion factor 0.6%
Output level 0.18 v (at 30% modulation)
<General>
Power consumption 7W
Pwer 100 VAC, 50Hz/60Hz
External Dimensions (including legs, knobs, terminals) Width 434x Height 70x Depth 283 mm
Weight 3.0kg