Audio Database

TU-300Z
Commentary

This FM/AM tuner is based on TU-300 and is designed with the aim of improving the stability and the completeness further.

The front-end section uses high-frequency two stage amplification with two low-noise FETs and four variable capacitor to improve sensitivity and interference rejection capability.

The IF amplifier uses two silicon monolithic ICs and four ceramic filter elements, and achieves two signal selectivity of 70 dB or more and passband characteristics of 3 dB bandwidth of 200 kHz or more.

It employs a newly developed non-backlash tuning system, enabling accurate channel selection without backlash.

The MPX section is equipped with a newly designed LC resonance low-pass filter, which eliminates 19 kHz pilot signal and 38 kHz subcarrier leakage signals that are harmful to the output audio signal.

It is a 2-meter system with signal meter and 0 center tuning meter.

Equipped with FM muting circuit, noise between stations can be reduced.

The AM tuner section uses a ferrite bar antenna to improve sensitivity.

Equipped with a level adjuster, output matching with other equipment is possible.

Model Rating
Type FM/AM Tuner
FM Tuner Section
Receiving frequency range 76 MHz to 90 MHz
Practical sensitivity (IHF) 2 μ V
Distortion Factor (1 kHz, 100% Modulation) mono:0.2%
stereo:0.4%
Signal-to-noise ratio (IHF) 70 dB or more
Two signal selectivity (IHF) 70 dB or more
Image interference ratio (84 MHz) 80 dB or more
AM suppression ratio (IHF) 60 dB or more
IF interference ratio 90 dB or more
Capture Ratio (IHF) 1.0 dB or less
Spurious response 80 dB or more
FM stereo separation 40 db or More (1 kHz)
30 dB or More (100 Hz to 7 kHz)
Frequency characteristic 50 Hz ~ 15 kHz + 0 -3dB (with 19 kHz Filter)
Output Level / Impedance
(1k μ V input, 100% modulation)
Fixed : 1V/2k Ω or less
Variable : 0 ~ 1V/2k Ω or less
<AM Tuner Section>
Receiving frequency range 525 kHz to 1605 kHz
Practical sensitivity 200 μ V/m (loop antenna)
30 μ V/m (external antenna used)
Image interference ratio (1000 kHz) 55 dB or more
IF Disturbance Ratio (1000 kHz) 40 dB or more
Selectivity (± 20 kHz) 60 dB or more
SN ratio (input 50k μ V, 30% modulation) 50 dB or less
Distortion factor (input 50k μ V, 30% modulation) Not more than 0.7%
Output Level / Impedance (30% Modulation) Fixed : 0.3V/2k Ω or less
Variable : 0 ~ 0.3V/2k Ω or less
<General>
Attachment Automatic switching between FM mono and stereo
Stereo indicator
Muting switch
High blend switch
Signal meter
FM center tuning meter
Feeder Antenna for FM (300 Ω)
75 Ω connector for FM
AM ferrite bar antenna
Power supply voltage 100 VAC, 50Hz/60Hz
Power consumption 15W
External dimensions Width 376x Height 140x Depth 310 mm
Weight 6kg
Attachment Connection code x1
75 Ω, 1 F-type plug for 3C-2V
T-type simple antenna for FM x1