JRC_NRD-545_brochure.pdf

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1、ITuning/Torque Dial The torque of the tuning dial can be freely adjusted. IRTTY Fine Tuning The demodulating filter to receive RTTY signals can be finely adjusted. IDimmer Control IRF Attenuator IDirect Entry of Frequencies from Ten-Key Pad IBuilt-In Speaker ITuning Dial Lock IUp/Down Switch IRecord

2、 Output IUser-Defined Function Modification IOthers For further information, contact: Since 1915 Main Office: Akasaka Twin Tower(Main), 17-22, Akasaka 2-chome, Minato-ku, Tokyo 107-8432, JAPAN Telephone: Tokyo(03)3584-8788 Facsimile: Tokyo(03)3584-8795 Telex: 2425420 JRCTOK J Cable: JAPANRADIO TOKYO

3、 Overseas Branches : Seattle, London Liaison Offices : Kaohsiung, Manila, Bangkok, Singapore, Jakarta, New Delhi, New York, Rotterdam, Piraeus, Las Palmas 19EMISO9001, ISO14001 Certified URL By Digital Signal Processing Versatile Accessory Functions IScan Designated memory channels can be scanned. T

4、he scanning time is user-defined. ISweep Designated frequencies can be swept. The sweep time is user-defined. IAutomatic Scan/Sweep Stop When squelch is activated during scan/sweep operation, the operation automatically stops and the frequency is received for a certain time duration. IMute Control T

5、he AF output of the receiver can be muted according to external grounding information. IClock/Timer The receivers power supply is automatically set to on/off by setting the timer. Relay contact output can also be turned on/off. ISleep Timer The sleep timer is provided to automatically turn the power

6、 off during bed time (180 minutes max). Options Specifications Frequency range:0.1 to 29.999999MHz with option board (CHE-199) installed NRD-545G:100kHz to 1999.999MHz NRD-545U:100kHz to 823.900MHz 849.100MHz to 868.900MHz 894.100MHz to 1849.900MHz 1910.100MHz to 1929.900MHz 1990.100MHz to 1999.999M

7、Hz Type of reception:USB,LSB,CW,RTTY,AM,FM WFM(with option board installed) Frequency stability:10ppm or less for 5min. to 60min. after tuning the power on, thereafter 2 ppm or less per hour, and 0.5 ppm or less (with option TCXO installed) Adjustable Minimum1Hz tuning step: (10Hz, 100Hz, 1kHz, 5kHz

8、, 6.25kHz, 9kHz, 10kHz, 12.5kHz, 20kHz, 25kHz, 30kHz, 50kHz or 100kHz steps available) 1A FUSE WB ANT 7.5 Kz DC OUTTIMER OUTRS - 232C (MAX 24V SA) EXT SP LINE OUT L LINE OUT RMUTE 100 AC VOLTAGE GNDH1-ZL0-Z ANTSW MADE IN JAPAN HFANT AC DC13.8V 240 220 120 MODEL SERIAL NO. RG MASS FCC ID:CKENRD-545 M

9、ADE IN JAPAN NRD - 545 00000 DIMMERCLOCKNR/BC WIDE BANDATT ATT POWER PHONESRECORD SQ LEVELRF GAIN LEVEL FM/WFMAM/AMSUSB/LSBCW/RTTY CLRMHzENT/kHz 123 456 789 0FUNC ON OFF TIMMER NB - 1 NB - 2 NOTCH TRACKING NRD-545 DSP RECEIVER WIDE INTER AGC RUN ECSSLOCK CH SCAN AGC T ARC T/BWC AF GAINTONE PBS CH SE

10、L BWC STEP SWEEP FREQ NARROW H CH M kHz kHzkHz PBS BWC 1 01 2 3 4 5 6 7 8 910 3 57 9 +20 +40 +80ds CLOCKTIMERON OFFSTART END MUTE AS DC REMOTE REVERSE FUNCTIONSCANSWEEPRUN MODEFILTERAGCCW RTTY WFM AMS USB LSBNARROWINTERWIDEOFF 1 2 3 4 5 330285 143 130 Dimensions Frequency memory:1000 channels (Frequ

11、ency, mode, bandwidth, ATT, AGC, and tuning step) Receiving system:Triple superheterodyne 1st IF70.455MHz 2nd IF455kHz 3rd IF20.22kHz Dynamic range:106dB (300Hz IF bandwidth) Image rejection:70dB or more Spurious response:60dB or more IF rejection:70dB or more PBS variable range:2.3kHz (in 50Hz step

12、s) Notch filter attenuation: 40dB or more Notch variable range2.5kHz (in 10Hz steps) Notch tracking range10kHz Antenna impedance:50 ohms (Lo-Z terminal) 600 ohms (Hi-Z terminal) Antenna input attenuator: Approx. 20dB AGC characteristics:The AF output varies 10dB or less for the antenna input of 3 V

13、to 100mV Release time:40msec. to 5.1sec. (20msec. steps) AF output: Speaker:1W or more (4 ohm load and 10% distortion) Line/recorder:1mW or more (600 ohm load, 10% distortion) RS-232C interface:4800 baud (Character format:1start bit, 8 data bits, non-parity,1 stop bit) Power supply:100/120/220/240 V

14、AC 10%, 40VA or less 12 to 16 VDC (13.8VDC standard), 30W or less Dimensions:330W130(143)H285(327)Dmm ( ):max. dimensions with projections Weight:Approx. 7.5kg Specifications and appearance may be subject to change without notice. ICHE-199 Wide-Band Converter Unit I6ZCJD00350 RS-232C Cable ICGD-197

15、Temperature Compensated Xtal Oscillator (TCXO) IST-3 Headphones Weight: Approx. 300g INVA-319 External Speaker Impedance: 8 ohms Max.input:3W Dimensions:180W130H280D mm Weight:Approx. 3kg ISensitivity 0.0.1-0.499999MHz 0.0.5-1.599999MHz 0.1.6-29.999999 MHz 0030-1000MHz 1260-1300MHz 14dB(5V) 6dB(2V)

16、10dB(0.32V) 24dB(15.8V) 16dB(6.3V) 6dB(2V) 10dB(3.2V) 10dB(3.2V) 6dB(0.5V) 2dB(0.8V) 2dB(0.8V) 6dB(2V) USB,LSB,CW,RTTYAMFMWFM Bandwidth:(USB/LSB/CW/RTTY/AM) 2.4kHz S/N:10dB Modulation (AM):400Hz,30% (at AM measurement) 12dB SINAD (FM/WFM) *Fitted with option board for 30MHz or more. ISelectivity 4.5

17、kHz 2.4kHz 1kHz 10kHz 4.5kHz or more 2.4kHz or more 1.0kHz or more 10kHz or more 8kHz or less 5kHz or less 4kHz or less WIDE INTER NARROW FM Bandwidth6dB60dB Left bandwidths in WIDE, INTER, and NARROW are examples, but variable between 0.01 to 9.99kHz (except for AMS, FM and WFM). Antenna connector

18、(low impedance) Antenna switch Antenna terminal (high impedance) Line output (R) jack Line output (L) jack External speaker jack MUTE terminal DC output jack Timer output terminal RS-232C connector DC power connector Fuse holder AC power connector AC voltage selector Wide band antenna connector 47 4

19、8 49 50 51 52 53 54 55 56 57 58 59 60 61 484950515253545556 57 58 59 60 61 47 D S P R E C E I V E R NRD-545 Enjoy Clear Digital Sound ! 1998.2CAT.No.Y15-23(No.75-1-15)Printed in japan DIGITAL Noise Reduction (NR) Received signals become audible, emerging from mixed noise, because the spectrum of the

20、 periodic signals is enhanced while random signals such as noise are attenuated. Signal processing is adjustable in 256 steps, allowing the most audible conditions to be set. The NR feature is also very effective for such noise which the previous noise blanker has not been able to handle. Beat Cance

21、ller (BC) Completely periodic signals such as beat sounds are exalted and cancelled. However, voice signals are not processed as periodic signals inthisBC,butprocessedtobefreefromdistortion. Signal processing can be set in 256 steps to achieve the most effective condition. The BC is also effective f

22、or multiple beats. Noise Blanker (NB) Like the previous noise blanker, this NB detects noise amplitudes and removes noise depending on the amplitude level on the time axis. NB1 (narrow blanking width) and NB2 (wide blanking width)canbeswitchedover,andtheNBdetection level is adjustable. Notch Filter

23、(NOTCH) Beat sounds are attenuated (at 40dB or more) using the steep attenuation characteristic of the IIR notch filter. Despite its steep characteristic, beat sounds are digitally processed and stably attenuated when once the NOTCH is preset. It is adjustable within 2.5kHz in 10Hz steps. With the n

24、otch tracking set to ON, the notch filter follows in the range of 10kHz even when the tuning dial is rotated. AGC Digital AGC is applied to all modes except in the WFM mode. An AGC loop is not only configured inside the DSP, but AGC is also applied to the primary IF amplifier via a D/A converter. Al

25、though the discharge time constant is fixed in the FM, WFM, AM and AMS modes, AGC is continuously adjustable between 0.04sec. and 5.1sec. in 20 msec. steps in the other modes. BFO The beat frequency oscillator (BFO) generates the BFO signals to demodulate the received signals in the LSB, USB,CW and

26、RTTY modes. RF Gain The information transferred to the RF GAIN control via the A/D converter is entered into the DSP to adjust the gain inside the DSP and the gain of the primary IF amplifier. Squelch (SQ) The squelch function is operated in all the modes. If an input signal is small, noise squelch

27、is activated, while signal level squelch is operated as the input signal becomes larger. Tone Control (TONE) The sound quality of the audio output can be continuously adjusted in a range of the low bandwidth of 1kHz or less to the high bandwidth of 10kHz (except in the RTTY and WFM modes). S-Meter T

28、he signal level is determined in reference to the input signal to the DSP, and the level is converted into an antenna input level, which activates the S-meter. Clear, Distortion-Free Sound ReproducedBy Digital Signal Processing The quality of radio reception, especially in the shortwave bands, is gr

29、eatly affected by the performance of the receiver, because of the high density of the shortwave radio spectrum and its wide dynamic range (of small to large signals). The receivers sensitivity (capacity of receiving small signals) is constricted by the noise from the space or the atmosphere, and by

30、the internal noise generated by the receiver itself, while the capacity of handling large signals is affected by intermodulation between strong radio signals. If it is required to reject intermodulation distortion over a wide dynamic range, then digital signal processing (DSP) achieves a remarkable

31、advantage. Signal quantization (conversion of analog signals to digital quantities) is performed in a completely linear domain over the entire range, thus never generating any intermodulation distortion. The NRD-545 DSP Receiver is loaded with a 40-bit extended floating point DSP IC (digital signal

32、processor IC), a -type 18-bit over-sampling A/D converter, and a 16-bit D/A converter. The DSP IC performs signal processing in all the circuits after the intermediate frequency (IF) stage. The functions of 13 types of circuits after the IF stage, which have previously been configured as analog circ

33、uits, are now handled by the DSP IC. The digital IF filter, one of the DSP features, provides a sharper attenuation gradient and frequency characteristic than a crystal filter, thus allowing continuous bandwidth adjustment. All traditional crystal filters and mechanical filters that have previously

34、determined the selectivity characteristics of receivers are eliminated from the new DSP receiver. In addition to JRCs recognized receiver front end, complete digital signal processing in all the circuits after the IF stage has been realized. Thus, the new-generation NRD-545 receiver has come into th

35、e world. Digital signal processing uses an algebraic operation method for signal detection, generation, inference, processing, or transmission. Compared to analog signal processing circuits, digital signal processors are more advantageous: They only require less precise components; they are robust a

36、gainst drift and interference; they are easier to integrate with high precision; and they offer greater flexibility with software processing. The DSP IC consists of a multiplier, an adder-subtractor, and a memory (shift register). The digital signal processing algorithm is based on repetition of ope

37、rations such as data readout from the memory, multiplication, addition and subtraction. All-Mode Detection The DSP IC performs signal detection in all the modes including LSB, USB, CW, RTTY, FM, AM and ECSS (Exalted Carrier Selectable Sideband). Digital IF Filter Superior selectivity performance is

38、achieved by a simultaneous Chebyshev type digital IF filter withanIIR(infiniteimpulseresponse)configuration. Pass bandwidth is continuously adjustable in a range of 10Hz to 9.99kHz in 10Hz steps (BWC). Default values can also be set for each mode in NARROW, INTERmediate, and WIDE positions (except f

39、or AMS, FM and WFM modes). Pass-Band Shift (PBS) Radio interference is pushed out of the band by shifting the center frequency of the digital IF filter upward or downward in the variable range of within 2.3kHz (in 50Hz steps). Desired signal Interference signal fo Band shifted by PBS Digital Signal

40、Processing by One-Chip DSP A wide dynamic range and improved sensitivity is achieved by four junction type FFTs with low noiseandsuperiorcrossmodulationcharacteristic whichareusedeachinthefirst-stageRFamplifier and the first mixer. The RF amplifier employs a high power gain circuit in which 4 FETs a

41、re interconnected in parallel in order to improve the receiving sensitivity. For the first mixer, a double-balancedmixerwith4FETsinaquadruple connection is used in order to reduce odd- order intermodulation distortion (IMD). A variable tuning system (electronic variable tuning by a capacitor diode)

42、is employed in the front-end double tuning circuit. Continuous adjustment of the center frequency of the double tuning circuit is made by a CPU depending on the received frequency. This enables unwanted radio waves to be drastically attenuated, compared with the wide-band BPF having a fixed bandwidt

43、h. As a result, multi-signal characteristics are significantly improved, ensuring enhanced receiving performance. A one-chip DDS (direct digital synthesizer) and a PLL (phase-locked loop) circuit are combined tosubstantiallyimprovesynthesizerperformance. High-speed frequency switching in 1Hz steps w

44、hich has been difficult only with the PLL, and a high C/N (carrier to noise) ratio and simplified entire circuit configuration are achieved. For frequency control in 1Hz steps, tuning operation can be made similarly to an analog-type VFO. 140 120 100 80 60 40 20 0 -20 -40 Measuring conditions Rx fre

45、q14.25MHz IF bandwidth300Hz Input level1mV=0(dBm) Interference freq F1=14.20MHz F2=14.15MHz Desired signal output Receiver output level (dB) +20(dBm) Intercept point Third-order IMD output Receiver input level Dynamic range 106(dB)Noise level Noise floor level -139(dBm) -140 -40-200+20+40+60+80 +100

46、 +120 +140 -120 -100-80-60-40-200+20+40 (dBm) (dBm) As an RTTY demodulation circuit is incorporated, demodulation is available in accordance with ITU-T No.2 codes for 170, 425 and 850Hz shifting widths at 37 to 75 baud rates. Demodulated output can be indicated on the display of a computer via RS-23

47、2C interface. ENT/kHz switch MHz switch CLEAR switch Pass Band Shift control TONE control FINE control AF GAIN control AGC Time switch Bandwidth Control switch Channel Select switch Up switch Channel switch SCAN switch STEP switch LOCK switch Main tuning control Variable torque control Down switch F

48、requency switch SWEEP switch RUN switch ECSS switch WIDE switch INTER switch NARROW switch AGC switch NOTCH control RF GAIN control NOTCH switch Noise Blanker LEVEL control Squelch LEVEL control Noise Blanker switch RECORD jack POWER switch PHONES jack ATT switch FM/WFM switch AM/AMS switch USB/LSB

49、switch CW/RTTY switch DIMMER switch CLOCK switch Noise Reduction/Beat Canceller switch LCD Display Ten-key pad Function switch The multifunctional LCD presents a digital bar- graph meter which can be seen in an analog fashion. Various indications such as all-digit frequency (down to the 10-Hz digit), memory channel,modeandbandwidtharealsopresented on the large color LCD. Remote Control from a personal computer is available. All operations including receiving frequency setting can be remotely controlled by command from a personal computer. The data such as the receivers setting con