Pioneer F-757

Commentary

A synthesizer tuner equipped with newly developed technologies such as DDDtypeIV and MPX NR in pursuit of low distortion and high S/N.

It is equipped with DDDtypeIV, an advanced version of DDD that realizes low distortion and high S/N by converting radio waves into digital signals and directly demodulating them into audio signals.
In order to reduce the distortion generated by the IF filter, the demodulation signal is fed back to the input section by a newly developed linearizer developed by Pioneer to eliminate it, and higher S/N separation is achieved.

The front end is equipped with a high-precision 4-row front end.
The tuning element consists of a twin varicap, an RF amplifier of dual MOS-FET with excellent linearity, and a high-precision receiver as a balanced mixer circuit, improving intermodulation characteristics by more than 10 dB.
In addition, an RF attenuator circuit is mounted on the front-end input to further enhance the interference rejection capability and reduce the influence of adjacent stations.

It is equipped with MPX NR by newly developed original IC, and S/N ratio is improved even in weak electric field reception.

The honeycomb chassis, large insulators, and local OSC modules are filled with resin to prevent vibration.
In addition, technologies such as a low-pass filter using FDNR with improved S/N and distortion, and normal / super narrow switching which operates with an independent distortion adjustment circuit are adopted.
In addition, it uses audio-only parts and a power supply using oxygen-free copper wires.

It is equipped with functions such as spectrum simulated stereo, 36 stations random preset, and 2-system antenna input to provide natural stereo feeling even in AM and FM monaural.

Wireless remote control is included.

Model Rating

Type	FM/AM Digital Synthesizer Tuner
<FM tuner section (new IHF)>
Receiving frequency	76 MHz to 90 MHz
Practical sensitivity	Mono : 9.3 dBf (0.8 μ V/75 Ω)
Signal-to-noise ratio	mono:100dB stereo:92dB
Harmonic distortion factor	mono: 0.008%(100Hz) 0.005%(1kHz) 0.01%(10kHz) stereo: 0.01%(100Hz) 0.008%(1kHz) 0.05%(10kHz)
Capture ratio	0.8dB
Effective selectivity (400 kHz)	Normal:75dB Super narrow:90dB
Stereo separation	70dB(1kHz) 54 dB (20 Hz to 10 kHz)
Frequency characteristic	20 Hz to 15 kHz + 0.2 -0.8 dB
Image interference ratio	80dB
IF interference ratio	100db
AM suppression ratio	80dB
Spurious interference ratio	80dB
Subcarrier suppression ratio	65dB
Muting action level	23.2 dBf (4 μ V/75 Ω)
Antenna	75 Ω Unbalanced Type
<AM Tuner Section>
Receiving frequency	522 kHz to 1629 kHz
Practical sensitivity (attached loop antenna)	150 μ V/m
Selectivity	40 dB (± 9 kHz)
Signal-to-noise ratio	50dB
Image interference ratio	40dB
IF interference ratio	60dB
Antenna	Loop antenna (included)
<General>
Output Level / Impedance	FM (100% modulation) : 650mV/900 Ω AM (30% modulation) : 150mV/900 Ω
Power supply voltage	100 VAC, 50Hz/60Hz
Power consumption	16W (Electrical Appliance and Material Control Law) 5.4W (standby)
External dimensions	Width 420x Height 86x Depth 316 mm
Weight	4.1kg
Attachment	Remote control