JRC NRD-545 User manual

* * " :
MODEL NRD-545
'
daftanRadio Co., JUd.

INTRODUCTION
Thismanualdescribes the basic operatingprinciples ofthe NRD-545DSPreceiver and itemsrequired forits
maintenance.Pleaserefer tothe UserManualsuppliedwith the equipment forhowto operate and handle the
NRD-545.
The NRD-545consists of eightunits.Eachcircuit has beendesigned to minimize the number of locationsthat
mightrequireadjustmentwith the passage of time, andso increaseoperatingstability. Itis thereforeonlynecessary
to service the equipmentaccording tothe instructionscontained in thismanualwhen a fault becomesapparent.
Pleaserefer tothe table of units andbe sure to enter the name and type onthe formwhenorderingreplacement
unit.
Please refer tothe partslists and enter the unit type,part No., type, and codewhenorderingparts.
CONTENTS
1. SPECIFICATIONS 1
2. FRO NT PANEL AND REARPANEL 3
2-1 FRONTPANEL 3
2-2 REARPANEL 4
3. LAYOUT OF UNITS 5
4. ASSEMBLYDRAWING 6
5. BLOCK DIAGRAM 7
6. DESCRIPTION OF CIRCUITS 8
6-1 OUTLINE OF BLOCKS 8
6-2 DESCRIPTION OF UNITS 9
7. ADJUSTMENT 15
7-1 PREPARATION 15
7-2 CBD-1363 POWERCIRCUIT 16
7-3 CDE-860 DISPLAY UNIT 17
7-4 CGK-160 REF/DDS UNIT 19
7-5 CGA-184 LOOP1UNIT 20
7-6 CDA-752 DSP JJNIT 21
7-7 CFH-71 1ST IF UNIT 22
7-8 CFL-356 RF TUNEUNIT 25
7-9 INTEGRATEDADJUSTMENTS 26
7-10 CHE-199 WIDEBANDCONVERTERUNIT 34
8. TROUBLESHOOTING 41
8-1 SIMPLEPROBLEMS 41
8-2 MORESERIOUSPROBLEMS 42
8-3 MAINTENANCE 43
9. CIRCUITDIAGRAM ANDPCB LAYOUT 44
9-1 CIRCUITDIAGRAM 44
9-2PCB LAYOUT 56

9-3DC VOLTAGE FOR EACHTRANSISTOR 72
9-4DC VOLTAGE FOR EACH 1C 76
10. OPTIONAL UNITS 86
10-1INTRODUCTION 86
10-2 REMOVINGCOVERS 89
10-3REMOVINGINTERNALUNITS 90
10-4FASTENINGCOVERS 90
11. LEVELDIAGRAM 91
92

1. SPECIFICATIONS
(1) Operating frequencyrange
( 2) Modes of Reception
(3 ) Frequency stability
(4 ) Minimum tuning step
(5) MemoryCapacity
( 6) Receivingsystem
(7) Sensitivity
With optionalboard CHE-199 installed:
NRD-545J: 0.1~252.9MHz, 255.l~261.9MHz
266.1 ~270.9MHz, 275.l~379.9MHz
382.l~411.9MHz, 415.l~809.9MHz
834.l~859.9MHz, 889.l~914.9MHz
960.1~1999.999MHz
NRD-545G: 0.1~1999.999MHz
NRD-545U: 0.1~823.9MHz, 849.l~868.9MHz
894.l~1849.9MHz, 1910.l~1929.9MHz
1990.1~1999.999MHz
USB,LSB, CW, RTTY, AM, FM,WFM (withoptionalboard
installed)
(Note: USB, LSB, CW,and RTTYmodes are available at
below30MHz. WFM mode is available at 30MHz or
more.)
± lOppm or less after 5 to60 minuteswarm-upperiod;
± 2ppm per hour or less from then on
± 0.5ppm(withoptionalTCXO mounted)
IHz
(lOHz, lOOHz, 1kHz,5kHz,6.25kHz,9kHz,10kHz,12.5kHz,
20kHz, 25kHz,30kHz,50kHz,100kHzstepsavailable)
1000channels /
(frequency, mode,bandwidth,ATT,AGC, and tuningstep)
Triplesuperheterodyne
1stIF: 70.455MHz
2nd IF: 455kHz
3rd IF: 20.22kHz
^^— --___
0 'i-t S9Q9Q9MH7
30-1000MH7
USB,LSB, CW, RTTY
AM FM
WFM
Bandwidth: USB/LSB/CW/RTTY/AM: 2.4kHz
S/N: lOdB, Modulation: 400Hz, 30% (whenmeasuringAM), 12dB SINAD(whenmeasuring FMand WFM).
Note: The sensitivity of 30MHz or moremeasuredwith CHE-199 UNIT installed.

Selectivity
WIDE
INTER
NARROW
FM
Bandwidth
4.5kHz
2.4kHz
1kHz
10kHz
6dB
4.5kHz or more
2.4kHz or more
1kHz or more
10kHz or more
60dB
8kHz or less
5kHz or less
4kHz or less
The WIDE,INTER, and NARROW are only
examples. The bandwidth canbesetas desired
between 0.01 and 9.99kHz(except for AMS, FM,
and WFM).
(9 ) Dynamic range
(10) Image rejection
(11) Spurious response
(12) IF rejection
(13) PBS variable range
(14) NOTCH attenuation
(15) NOTCH variable range
(16) NOTCH tracking range
(17) Antenna impedance
(18) Attenuator
(19) AGC characteristics
(20) Audio frequency output
(21)RS-232C interface
(22)Power requirements
(23) Dimensions
(24)Weight
106dB (IF bandwidth:300Hz)
70dB or more
60dB or more
70dB or more
± 2.3kHz(50Hzsteps)
40dB or more
± 2.5kHz (lOHz steps)
± 10kHz
50 Q (Lo-Z terminal)
600Q (Hi-Zterminal)
Approx.20dB
lOdB or less variation in audio-frequencyoutput in relation toa
changebetween 3//V and lOOmV antennainput
Releasetime:40mS to 5.IS (20mS steps)
Speakeroutput: 1W or more (4Q load, 10% distortion)
Lineoutput and recordingoutput: ImW or more(600 Q load,
10% distortion)
Baud rate: 4800 baud
(characterstructure: 1 startbit, 8 data bits, no-paritybit, 1 stop
bit)
AC 100/120/220/240V ± 10%,40VA or less
DC12to16V (standard 13.8V) 30W or less
330(w)x 130 (143) (h)x 285 (327) (d)mm
Valus in parenthesesincludeprojections.
Approx.7.5kg
Notes: 1. Specifications and appearance,etc., are subject to changewithoutpriornotice.
2.Inthe event ofa mismatchbetween the manual and operation ofthe actual equipment, operation of
the actual equipment takesprecedence.

2. FRONT PANEL AND REAR PANEL
2-1 FRONTPANEL
CD TONEcontrol
(D AF GAINcontrol
® AGCT button
®BWC (bandwidthcontrol)button
(D CHSEL (channelselect)button
© STEPbutton
® LOCKbutton
® SCANbutton
(D Tuning control/torque control
® SWEEPbutton
©RUN button
© ECSSbutton
®AGC button
® NOTCHcontrol
© RF GAINcontrol
® NOTCHbutton
SQ LEVEL(squelchlevel)control
NB LEVEL(noiseblankerlevel)
control
RECORD jack
PHONES jack
POWER switch
NB (noise blanker) button
ATT (attenuator)button
DIMMER button
CLOCK button
FM/WFM button
NR/BC (noisereduction/beatcan-
celler)button
AM/AMS button
USB/LSB button
CW/RTTY button
NARROW button
INTERbutton
WIDE button
FREQ (frequency)button
LCD display
> (UP) and< (DOWN)button
CH (channel)button
Numericalkeypad
FUNC(function)button
MHz button
ENT/kHz button
CLR (clear)button
PBS (passband shift)control
FINE control

2-2
REAR PANEL
ANT Lo-Z(low-impedance)connector
ANT SW (antennaswitch)
ANT Hi-Z(high-impedance) terminal
LINE OUT R jack
LINE OUT L jack
EXT SP (speaker) jack
MUTEjack
DC OUT(DC output) jack
TIMER OUT terminal
RS-232Cconnector
DC powerconnector
Fuse holder
AC powerconnector
Voltageselector
WBANT (wideband antenna) connector

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