Audio Database

Image of the F-515
Commentary

Digital synthesizer tuner that adopts silent servo circuit and CCTS circuit.

It is equipped with a silent servo circuit to cut off noise from PLL circuit and microcomputer.
By stopping the PLL circuit and microcomputer circuit after tuning is completed and receiving as an analog tuner, adverse effects such as harmonics of the clock frequency are suppressed.

By using a CCTS circuit that can receive with high sensitivity by equalizing the receiving frequency and the resonance frequency of the antenna stage, generation of distortion is greatly suppressed.

An AM servo circuit is mounted to reduce distortion of AM reception.
The AM tuning is an automatic gain control (AGC) operation, which reduces distortion by setting it to an appropriate state at the time of reception and at the completion of reception.
This greatly improves the low-frequency distortion and high-frequency characteristics of the AM.

FM/AM Random 24 station preset is installed.

A honeycomb chassis with excellent vibration characteristics and a large insulator are used to make it difficult for external vibrations to be transmitted to the circuit.
Components such as capacitors and resistors for audio equipment are also used.

ON/OFF of stereo / mono, AM servo and silent servo can be memorized.
Mode memory is installed.

DX/LOCAL mode memory is installed.

Model Rating
Type FM/AM Digital Synthesizer Tuner
FM Tuner Section
Receiving frequency 76 MHz to 90 MHz
Practical sensitivity Mono : 13.2 dBf (1.26 μ V/75 Ω)
S/N50dB sensitivity Mono : 17.2 dBf (2.0 μ V/75 Ω)
Stereo : 37.2 dBf (20.0 μ V/75 Ω)
Signal-to-noise ratio mono:82dB
stereo:79dB
Harmonic distortion factor (1 kHz) mono:0.05%
stereo:0.05%
Effective selectivity 60dB(400kHz)
Stereo separation 1kHz:44dB
Frequency characteristic 30 Hz to 15 kHz ± 0.8 dB
Image interference ratio 65dB
IF interference ratio 110dB
AM suppression ratio 57dB
Antenna input impedance 75 Ω Unbalanced Type
<AM Tuner Section>
Receiving frequency 522 kHz to 1629 kHz
Practical sensitivity (attached loop antenna) 350 μ V/m
Selectivity 40dB
Signal-to-noise ratio 54dB
Image interference ratio 40dB
IF interference ratio 55dB
Rated Distortion Factor (AM Servo ON) 0.19%(1kHz)
0.4%(100Hz)
Antenna Loop antenna (included)
<General>
Output Level / Impedance FM (100% modulation) : 650mV/5.1k Ω
AM (30% modulation) : 150mV/5.1k Ω
Power supply voltage 100 VAC, 50Hz/60Hz
Power consumption (Electrical Appliance and Material Control Law) 10W
External dimensions Width 420x Height 85.5x Depth 318 mm
Weight 3.5kg