Cyrus Tuner mkI

The advent of digitally synthesised tuners has substantially improved the reception quality of FM broadcasts. A few problems however continue to persist in the design of most Fm tuners. The most serious of these problems we consider to be sibilance in high frequencies and poor low-frequency performance. It is common knowledge that the low-frequency performance of tuners lacks authority, control, definition, and articulation - especially when compared to the latest generation CD players.

The objectives of Cyrus Electronics have been to produce an outstanding tuner where the FM section does not suffer the nagging problem of "spitting" sibilance, and to give bass notes their rightful and necessary musical weight, tempo, and authority. The Cyrus Tuner is manufactured in a case of identical dimensions and appearance to the rest of the Cyrus range, and will suit the requirements of the perfectionist audiophile who owns either a Cyrus One or a Cyrus Two.

The design is based on microprocessor controlled digital frequency synthesised tuning,, and provides 19 FM and 9 MW preset with C-MOS memory back-up. The unit provides variable speed up/down scanning, automatic search, as well as manual tuning. Automatic FM mute is provided to eliminate irritating interstation noise. Quartz-locked tuning system is adopted for ultimate tuning accuracy and minimal frequency drift. An informative Fluorescent Tube Display electronically generates digital frequency readout, "Tuning " indication, "Stereo" reception and, when selected, preset channel number. For finest reception quality under adverse signal conditions the Cyrus Tuner has FET front-ends (dual-gate with automatic gain control on FM). The FM mixer oscillator is buffered to ensure high immunity to interference, and Ceramic filters are incorporated for high selectivity on both AM and FM wavebands. The Cyrus Tuner offers "Sliding Stereo" decoder maintaining full channel separation on strong signals, and changing gradually to mono for fullest noise suppression on weak signals. PLL decoder circuitry produces a stable audio signal with optimum channel separation, and an SISC filter cuts out interference on stereo broadcasts.

Specifications

FM Section

Frequency Range:  87,5 - 108 MHz

Frequency Response:  20 Hz - 15 kHz ±1 dB

Audio Output:  1 V RMS

Sensitivity (75 Ω input)

Mono :  0,8 µV (26 dB s'n)

Stereo ;  18 µV (46 dB s'n)

Selectivity:  72 dB

IF Suppression:  100 dB

Image Frequency Suppression:  57 dB

Pilot Tone Suppression:  43 dB

Stereo Separation (1 kHz):  36 dB

Signal-to-Noise Ratio

Mono :  73 dB

Stereo :  71 dB

Total Harmonic Distortion

Mono :  0,15%

Stereo ;  0,4%

Aerial Input:  75 Ω coaxial

AM Section

Frequency Range:  513 - 1611 kHz (186 - 584 m)

Audio Output:  0,3V RMS

Sensitivity:  130 µV (26 dB s'n)

Selectivity:  58 dB

MF Suppression 52 dB

Image Frequency Suppression:  58 db

Aerial Input:  External loop Aerial and External Connection Socket

Dimensions (W x H x D):  215 x 85 x 340 mm

Weight: 2 kg