Aiwa ST-R50 tuner

 Quartz Synthesizer Tuner

You won't find a tuning knob on the ST-R50, because there's no more tuning capacitor to be rotated. All tuning is performed automatically and electronically by means of an voltage-sensitive varactor diode that employs a PLL quartz synthesizer for extra accuracy. Up to 10 MW, FM and LW stations may be programmed at random into the memory circuit and recalled instantly at the touch of a button. Manual tuning is also possible by holding in the up or down control until the desired station frequency is displayed. For optimum sound quality, a quadrature detector circuit with 6-element ceramic filters having flat group delay characteristics achieves a high sensitivity.

A newly developed IC in the limiter and detector reliability. A PLL IC in the MPX demodulation stage provides stable FM stereo switching unaffected by temperature, humidity or aging. The ST-R50 can also be combined with a couple of Aiwa optionals that make it perhaps the most convenient all-around versatile tuner available. When connected to the optional MT-50 timer unit, two On/Off cycles can be programmed at any time desired, and if the power remains on, preset stations may be changed automatically up to 6 times in a 24 hour period. The RC-R300 wireless remote transmitter/receiver unit (also optional) is capable of performing manual Up/Down tuning or selection of preset stations from up to six meters (20 feet ) away.

Features:

Adjustable synthesizer sensitivity control

3 or 4 digit tuned frequency display

FM muting and Hi-blend switches

5-point LED signal strength indicator

 

Specifications

FM Section

Frequency Range:  87,5 - 108 MHz

Usable Sensitivity:  1,9 µV (10,8 dBf)

50 dB Quieting Sensitivity:

Mono :  4,5 µV (18,2 dBf)

Stereo :  45 µV (38,2 dBf)

Capture Ratio:  1,5 dB

Selectivity:  35 dB (±300 kHz);  65 dB (±400 kHz)

Signal-to-Noise Ratio

Mono :  75 dB

Stereo :  72 dB

Image Rejection Ratio:  80 dB

IF Rejection Ratio:  80 dB

Spurious Rejection Ratio:  90 dB

AM Suppression Ratio:  55 dB

Total Harmonic Distortion

Mono :  0,1% (1 kHz)

Stereo :  0,2% (1 kHz)

Frequency Response: 30 Hz - 15,000 Hz (+0,5 -1,5 dB)

Stereo Separation :  45 dB (1 kHz)

AM Section

Frequency Range:

MW :  525 kHz - 1605 kHz

LW :  150 kHz - 285 kHz

Usable Sensitivity

Bar Antenna:

MW :  250 µV/m

LW :  700 µV/m

External Antenna:

MW :  30 µV

LW :  70 µV/m

Selectivity:  30 dB

Signal-to-Noise Ratio:  50 dB

Image Rejection Ratio:

MW :  45 dB (1,000 kHz)

LW :  40 dB (250 kHz)

IF Rejection Ratio:  35 dB

MW :  1,000 kHz

LW :  250 kHz

Power Source:  240 V 50/60 Hz

Dimensions (W x H x D):  250 x 71 x 280 mm (9-7/8" x 2-13/16" x 11-1/16")

Weight:  2,4 kg (5,3 lbs)