Audio Database

Image of the Integra T-445XG
Commentary

An FM/AM tuner which pursued the ability improvement in actual operation corresponding to various condition changes.
Equipped with automatic / manual reception mode selection such as RF2-stage switching, IF selectivity switching, PLL reception mode switching, auto high blend, etc., it can respond to operating conditions and radio wave conditions.

By switching the response speed of the PLL to two stages, the generation of distortion due to non-linear tracking performance is suppressed.
The influence of external vibration such as sound pressure from speakers is greatest. For the VCO (local oscillator), as a mechanical vibration control measure, the local oscillator and the chassis are effectively fixed to suppress the occurrence of distortion.
In addition, two varicaps (receiving elements for broadcasting stations) are arranged in parallel to double the capacity value, so that even if the chassis vibrates due to strong music signals and the electrical circuit capacity fluctuates, the circuit effect is reduced to 1/2.

The detector uses a linear tracing detector.
The L. T. D uses a direct detection method for 10.7 MHz, and is a closed-loop type in which the signal 90 ° behind the IF signal is linearly traced to the IF signal for detection, thus improving S/N.

Intermodulation interference characteristics have been improved by adopting a two stage series buffer and RF two stage switching.

It is equipped with AM and FM random 20-station memory, preset scan, 5-station timer program, etc.

You can check the reception status such as Boost ON/OFF, IF Wide/Narrow, and Hi-Blend ON/OFF with indicators.

Model Rating
Type FM/AM Tuner
FM Tuner Section
Receiving frequency
76.1 mhz to 89.9 mhz
Practical Sensitivity (75 Ω / IHF) Boost on : 0.9 μ V/10.3 dBf
Boost off : 4.0 μ V/23.3 dBf
SN50dB Sensitivity (75 Ω / IHF) 2.0 μ V/17.3 dBf
Intermodulation interference ratio (wide / narrow) ± 1 mhz 88dB/103dB
± 2.5 MHz 90dB/110dB
Image Interference Ratio (83 mhz) 90dB(Boost on/off)
IF Interference Ratio (83 MHz) 100dB(Boost on/off)
Spurious interference ratio 100dB(Boost on/off)
Two signal selectivity Wide:60dB
Narrow:85dB
Distortion factor
mono 400Hz: 0.0055%(Wide)
0.15%(Narrow)
stereo 400Hz: 0.008%(Wide)
0.4%(Narrow)
Stereo separation
1kHz: 68dB(Wide)
45dB(Narrow)
100 Hz to 10 kHz : 45dB(Wide)
40dB(Narrow)
AM suppression ratio Wide:62dB
Narrow:50dB
Capture ratio Wide:1.0dB
Narrow:2.0dB
Signal-to-noise ratio mono:100dB
stereo:90dB
Frequency characteristic 20 Hz to 15 kHz, + 0.2 -0.8 dB
Carrier leak -65dB
Antenna impedance 75 Ω unbalance
Output Voltage (400 Hz) 500mV(100%)
Output impedance 1.9k Ω
<AM Tuner Section>
Practical sensitivity 200 μ V/m (attached loop antenna)
Image interference ratio (999 kHz) 40dB
IF interference ratio (999 kHz) 57dB
2 signal selectivity (selectivity + / - 10k) 35dB
Signal-to-noise ratio 50dB(100mV/m)
Strain Rate (400 Hz) 0.3%
Output Voltage (400 Hz) 150mV(30%)
Output impedance 1.9k Ω
<General>
Pwer 100 VAC, 50Hz/60Hz
Power consumption (Electrical Appliance and Material Control Law) 17W
External dimensions Width 435x Height 73x Depth 368 mm
Weight 4kg