JRC NRD-630

* Digital Signal Processing 

 *High-end OCXO     *High-end DDS IC

*FIR Filter    *SSQ Squelch    *Noise Blanker    *AF Filter

LED Display in 8 digits (10MHz to 1 Hz digital)

A tuning knob, up/down switch and numeric keypad are provided for frequency input.

Along with IF filters, frequencies lower than the third IF are subjected to digital signal processing performed by a 32-bit floating point DSP.

Adoption of high-end OCXO reduces the warm up time and enables stability at 0.2 ppm.

High-end DDS IC provides high speed and smooth 1Hz step tuning.

Finite Impulse Response filter is used as the IF filter for frequencies above 2.7 kHz, thereby significantly reducing the group delay distortion.

Syllabic Squelch is provided as standard, in which the squelch circuit is activates when receiving extraneous pulse noise during a watch and the circuitry opens up only when it detects voice. This allows stable squelch operation in environments where the reception level varies due to fading and the like.

The electronic automatic tuning circuit deployed as input tuning circuit can select the target wave and its peripheral signals so as to significantly improve the effective sensitivity.

A noise blanker and AF filter are provided as standard for removing of noise due to pulses generated by rain/snowfall, and for improving the S/N ratio of static-ridden signals, respectively.

Built in memory can preset 300 channels storing frequency, mode, bandwidth, AGC and attenuator.

Technical Specifications

Frequency Range 90 kHz - 29999.999 MHz (1 Hz steps)
Reception Modes CW, MCW, DSB, USB/LSB, FSK, FAX, ISB
Power AC 85-264V; Single Phase 50/60 Hz; AC/DC Automatic Switchover; DC +24V
Stability ± 0.2 PPM
Triple Conversion Super-heterodyne
IF Frequencies 1st 70.455 MHz, 2nd 455 kHz, 3rd 17 kHz
IF Rejection Ratio 80 dB or more
Image Rejection Ratio 70 dB or more
Standard Steps 1 Hz, 10 Hz, 100 Hz, 1 kHz, 5 kHz, 9 kHz, 10 kHz or 100 kHz. 
RF Attenuator 20dB/10dB
BFO Range ± 9.999 kHz 1 Hz steps
Clarifier Range ± 200 Hz 1 Hz steps
Pass Band Shift Range ± 2.3 kHz
Audio Output 1 watt internal speaker; 1 watt external speaker 8 ohm; 10 mW or more headphone 600 ohm
Line Output -20 dBm to ± 10 dBm 600ohm balanced)
Dimensions H149 x W480 x D294 mm
Weight 6.0 kg or less

Optional Accessories