|
| ROTEL RT-2000 |
|
| 60,000yen( at the 1970 in-the-late time(?)) |
@
The FM/AM tuner which adopted the Quartz nowait-lock
scheme.
The Quartz nowait-lock scheme by a crystal oscillator is
adopted.
The Quartz nowait-lock scheme is always comparing exact 10.7MHz generated from a crystal oscillator, and 10.7MHz of a middle cycle amplification (IF). When a difference occurs here, the difference signal of plus or minus is made by a phase comparator, and the local oscillator is controlled through a low pass filter. In order that Quartz may not receive influence in a transition of humidity or a temperature, either, a frequency of oscillation remains locked and the drift after a syntony is eliminated.
Moreover, the touch nowait-lock-off scheme is adopted, while touching the
tuning knob, a nowait lock is canceled, and the Quartz nowait lock works at the
moment of lifting a hand.
The frequency linear-line type precision
5-unit variable condenser is adopted as a front end part. Moreover, the one dual
gate MOS FET is used in RT-2000.
The IF section can switch two steps of
bandwidth, and the requirement setups according to receiving requirements is
possible for it.
A high selectivity property is acquired by choosing NARROW,
when a radio-wave status is bad.
The carrier cancellar circuitry which
omits a pilot signal (19kHz) is carried in the MPX section. Moreover, by
adoption of LC block filter and PLL IC which paid attention to the damping of
the subcarrier signal (38kHz), the high region fall was suppressed and a wide
range is secured.
The multipath detection functionality is carried.
The pointer of a tuning meter displays in RT-2000.
The high blend
switchpoint which demonstrates power is carried in the reception of a
weak-electric-current community.
The 16 pin dual in-line IC puck
circuitry is adopted as AM tuner part.
|
| Form |
FM/AM tuner |
| <FM tuner part> |
| Sensitivity (IHF) |
mono: 9.8 dBf/1.7 microvolts (S/N 26dB)
stereo: 36 dBf/35 microvolts (S/N 50dB) |
| S/N ratio (IHF) |
mono:80dB
stereo:75dB |
| THD |
| mono |
wide:0.05%
narrow:0.15%
|
| stereo |
wide:0.07%
narrow:0.2%
|
|
| Capture ratio |
1dB |
| effective selectivity (IHF) |
narrow:80dB |
| Frequency characteristic |
30Hz-15kHz}0.2dB |
| Stereo separation |
45dB(1kHz) |
| Image stonewalling ratio |
100dB |
| IF stonewalling ratio |
100dB |
| AM supression ratio |
60dB |
| Muting |
5 microvolts |
| <AM tuner part>
|
| Sensitivity (IHF) |
200microvolts/m |
| S/N ratio |
55dB |
| Image stonewalling ratio |
50dB |
| Selectivity |
40dB |
| <Synthesis>
|
| Dimensions |
Width 482x height 143x depth of 328mm
|
| Weight |
7.5kg |
|
|
|