A miniature FM
Stereo tuner with Mighty performance and Quartz-PLL synthesizer tuning.
The M-F01 FM stereo
tuner not only guarantees absolutely free from tuning drift thereafter. Unlike
conventional FM tuners, whose performance depends very largely upon how well
they are tuned system ensures that it can
always without exception, give its very best performance.
The quartz PLL
tuning system is the secret of how this exceptional performance is obtained.
The quartz crystal gives an extremely accurate
64 MHz signal that is divided by 128 to give a basic 50 kHz frequency.
Comparing this reference frequency with one-half the local oscilator frequency
enables any phase difference between them to be eliminated, effectively locking
them together, this circuit is the phase locked loop (PLL). Under its action,
the local oscillator is limited to frequencies that are exactly 100 kHz apart -
e.g. 98,7; 98,8; 98,9 MHz etc.
The total harmonic
distortion is completely independent of detuning frequency over wide limits,
unlike conventional tuners.
Like other members
of the Microcomponent series, the M-F01 features unusually clear LED type
indicators. Here the locktune indicator is linked with the dial illumination;
normally the dial numbers are edge litin white , but as soon as a station is
tuned and locked, this is replaced by a gentle green glow. The five Leds on the
left indicate signal strength. The pointer lights on either side of the tuning
lock indicator go on to show which way the tuning knob should be turned for
perfect tuning. As soon as only the tuning lock LED is lit, tuning has been
completed, and the stereo LED will go on if the fM station is broadcasting in
stereo. Of course you can switch over to mono listening if the station is too
far away for good stereo reception - although the M-F01 is so sensitive that
this shouldn't happen too often.
Another useful
control lets you mute out interstation noise and stations too weak for good
reception, so that you only receive stations capable of top-quality reception.
Wide, Flat Frequency
response
Most FM tuners have
a filter to get rid of the unwanted pilot signal (at 19 kHz), but these also
affect the musical signal with frequencies below 19 kHz. In the M-F01 the pilot
signal is cancelled out completely without the use of a filter, so that frequency
response is flat to within ±1db at 16 kHz.
High performance
Front-end
The all-important
front end , that captures and processes the signal uses the same high precision
five ganged tuning condeser as the prestigious DA-F20. mitsubishi's top tuner,
making for great accuracy and stability. The M-F01 rejects spurious signals very
effectively thanks to dual gate MOS-FeT's in the RF amplifier and mixer stages,
and utilizes four pole linear phase LC filters for low distortion. Outstanding
temperature and humidity stability are ensured by the use of aluminium cored
coils and teflon trimmer-capacitors in the local oscillator, and glass epoxy
printed circuit boards, all representative of the state-of-the-art..
Recording level
Check Signal
A test signal at 440
Hz corresponding to 50% modulation of the FM signal is provided for easy level
setting when tape recording FM broadcasts.
Usable Sensitivity:
Mono : 11,2 dBf (2,0 µV)
Stereo : 22,7 dBf (7,5 µV)
50 dB Quieting
Sensitivity:
Mono : 19,2 dBf (5,0 µV)
Stereo : 39,2 dBf (50 µV)
Signal-to-Noise
Ratio:
Mono : 80 dB
Stereo : 77 dB
Frequency Response:
30 - 16,000 Hz ±1 dB
Total Harmonic
Distortion:
Mono : 0,08%
Stereo : 0,1%
Capture Ratio: 1,0 dB
Alternate Channel
Selectivity: 70 dB
Image Response
Ratio: 100 dB
IF Response
Ratio: 100 dB
Spurious Response
ratio: 100 dB
AM Suppression: 65 dB
Stereo Separation:
At 1 kHz : 50 dB
At 10 kHz : 40 dB
Subcarrier Product
Ratio: 80 dB
Output
Level/Impednce
Fixed : 150 mV/5 k
Ω
Variable ; 0 -500 mV/5 k Ω
Power
Consumption: 10 W
Dimensions (W x H x
D): 270 x 70 x 247 mm (10-5/8" x
2-3/4" x 9-3/4")
Weight: 3,5 kg (7 lb 11 oz)