JRC NDR-91 Instruction Manual

2 REV.

INSTRUCTION

MANUAL

RECEIVER

o+

O*

@

flrytnadioCo.,Ild.

MODEL

NRD-91

RECEIVER

OUTSIDE

VIEW

(DESK-MOUNT

TYPE)

#

û

o
o

ôffiË

MODEL NRD-91 RECEIVER

OUTSIDE VIEW

(CONSOLE

OR

RACK TYPE)

ô

CONTENTS

CAUTION

1. GENERAL

DESCRIPTION

1.1

FEATURES

1.2

SPEC|F|CAT|ONS

. . . . . .

2.

COMPOSTTTON

2.1

STANDARDCOMPOSITION

2.2

oPTtONS

2
2
2

5
5
5

3.

INSTALLATION

3.1

INSTALLATION

3.2

ANTI-INDUCTION

OF THE

TRANSMITTING

WAVE

3.3

CONNECTION

OF EXTERNAL

LINES

3.4

HOW

TO

MOUNT

AUX

CRYSTAL

OPE RATION

4.1

OPERATION PANEL

4.2

OPERATINGPROCEDURES

4.2.1

Basic

Operation

of

SSB Reception

4.2.2

Basic Operation

of

CW

Reception

4.2.3

Operation

of DSB

Reception

4.2.4

Operation

of FSK

Reception

4.2.5

Operation

of FAX

Reception

. .

.

4.2.6

Further

Operation

CIRCUIT DESCRIPTION

5.1

RECEIVING SECTION

5.2

LOCAL SIGANL

GENERATOR

SECTION

5.3

PANEL

SECTION

5.4

POWER

SUPPLY

SECTION

MAINTENANCE

6.1

GENERAL

6.2

GENERAL MAINTENANCE

AND CHECK

.

6.3 TROUBLESHOOTING

6.3.1 Decline of the

Sensitivity

6

6
6
6
9

l0
l0
t2
l3
l3
l3

t4
t4
l5

t6
t6
l6
t7
l8

t9
t9

t9
20
20

4.

5.

6.

-l-

6.3

.2 No

Sound . . .

2L

6.3.3

NoiseandBeat

....

.21

6.3.4 Interference by the

Transmitter

of

Your

Station

22

6.3.5

Intermodulation

23

Appendixed Drawings

Parts Arrangements
Block

Diagram

Outline

Drawing

Circuit

Diagrams

Speaker

Unit

-ll-

CAUTION

l. Read

this instruction

manual thoroughly before turning on

this receiver.

2.

When

connecting

the BK cable and

other cables, refer to Fig. 3.3 of

Paragraph

3.3.

3. When the

transmitting

waves are strongly

induced in the receiving antenna, take the

counter-

measure

described

in Paragraph 3.2.

4.

Do not turn

semifixed

resistors, high frequency transformers, trimmer capacitors, etc.

mounted

on

the

printed

circuit board

unless

absolutely

necessary,

because

they

are all

preadjusted

at the

factory.

5.

If

the

MHz

knob

is set at inadequate

position,

the

receiver is muted.

Therefore, the

MHz

knob must be

set

correctlv.

6. This

receiver

has low-voltage-operable

ICs and transistors. Be sure to turn

off both

power

switohes

when connecting

or removing the

printed

circuit board and cables to external

equipments.

1. If

the

AUX

mode

is

selected at a condition

where

additional

crystal

is

not

provided,

the

receiver operates

actually

in the DSB mode even though the AUX

mode

is indicated on the

front

panel.

8. The

illumination

of LEDS

(Receiving

frequency,

Mode

and Bandwidth

indicators) is

gradually

reduced as

turning

f-DlMMEil

knob

counterclockwise.

Finally they

fade

out

completely

at the minimum

position.

().

When

the ntode

is

except

SSB

and Frequency

Display

shows

the tiequency

between

000.0kH2

and 001.4kH2,

MHz

LED

displays the

frequerlcy

obtained by adding

lMHz to

the

display

of MHz Selector

Switch.

In

such

a case, Receiver

receives the frequency dis-

played

by LED.

10. When

the rnode

is except SSB,

the upper

limit of

the received

fiequency

to

be

displayed

is

3000

| .4kHz

and

the

lower limit

is

001

.5

kHz.

-l-

1.

GENERAL

DESCRIPTION

The

model

NRD-91

Receiver

is a highly

reliable

receiver

with the

simple

circuit

com-

position,

developed

by JRC

based

on

our many

year's

experiment

and

technical

results.

PLL

syuthesizer

is equipped

in

the first

local

oscillator

to

prvode

the high

accuracy

of

frequency

setting,

so that

this receiver

has

enough

performances

for

use

in the

SSB mode

as a

back-up

receiver.

1.1 FEATURES
I

)

Provided

with

digital

synthesizer

of PLL

type

The reference

oscillator

with

the high

stability

(t5

x

l0-6ppm)

ensures

high

stability

of

fiequencies

over

a

wide frequency

range

for

reception.

2)

Wide

receiving frequency

range

This receiver

covers

the wide

receiving

frequency

range

from

90 kHz

to 29.9999

MHz.

3)

Digital

indication

of

receiving

frequencies

This receiver

is

provided

with

light

emitting

diodes

for

a numerical

display

of the

receiving

frequency

from

100

Hz

digit

to l0

MHz

digit.

Therefore,

the frequency

can be set

correctly.

4)

BC band

rejector

BC band rejector

reduces

the interferences

such

as

cross-modulation

and intermodulation

due to

the

strong radio

wave

of

the

broadcasting

wave

generating

during

receiving

the

MHF

radio

wave.

5) Directly

connected

to

Teleprinter

and FAX

The line output

terminal,

600St

0 dBm,

is

provided.

By

adding the

optional

crystal, FSk

or

FAX

can be received

in

the

AUX mode.

At this time,

the

center

frequency

of

the line

output

is 1.7

kHz

and l.9 kHz

respectively.

6) Entirely

modular

construction

The

circuits are accomodated

in

the

plug-in

type

printed

circuit

boards

(excluding

the

panel

section

and

power

supply

unit).

Thus, maintenance

and

check are

facilitated.

1)

Operable

on

either

AC or

DC

power

The receiver

can be

operated

on

AC

or DC

power

by changing

the

power

switch

on

the

panel.

1.2

SPECIFICATIONS

I ) Receiving frequency

range

9O kHz

to 29.9999

MHz

2)

Circuit system
Double

superheterodyne

with

up-conversion

system

using

a

phase-locked

digital

frequency

synthesizer.

I st

lF- : 7 0.45

5 MHz

2nd IF

:

455 kHz

3)

Reception

mode

CW(AlA),

MCW(A2A,

HzA),

DSB(A3E),

SSB(R3E, H3E,

J3E)

and FSK(FlB)

or FAX

(F3C)

,2-

1)

But

FSK and

FAX are

option.

4)

Receiving

frequency

indication

{

Light

emitting

diode

for six-digit

numerical

display

(

I 0

MHz- to

100

Hz- digit)

5)

Tuning

method

Continuous

tuning

with MHz

knob,

UP/DOWN

switch

and TUNE

knob

of l}kHzl

rotation

(minimum

steP:

100 Hz)

6) Sensitivity

------_-_

Mode

Receivùg

-----

frequency

AIA

A3E

J3E

90-

199.9

kHz

2O

pY

or

less 60

pV

or

less

200-

1599.9

kHz

l0

pV

or

less

30

pV

or

less

1.6-29.9999

MHz

2

pY

or

less

6

pV

or

less

3

pV

or less

15çt

standard

signal

generator

is

directly

connected

to

the

antenna

terminal

S/N

20

dB,

Output 100

rnW,

Bandwidth

3 kHz,

400 Hz

30%

modulation.

Selectivity

-\!tenuation
BandwidÈ=--=-

6 dB

bandwidth

60

dB

bandwidth

6

kHz

4.4

kHz

or

more

l0

kHz

or

less

3

kHz 2-2.6

kHz

6 kHz

or

less

0.5

kHz

0.5-

1.0

kHz

3 kHz

or less

8)

Frequency

stability

I hour

after

l5-1rilute

preheating

t

10 x l0-6

or

less,

but

under

the

condition

where

the

receiving

frequency

is 1.6

MHz or

more

in

the SSB

mode.

9)

Image

rejection

ratio

60 dB

or

more

)

l0)

IF

rejection

ratio

60

dB

or

n-lore

I l)

Spurious

response

60

dB or

more

12) Blocking
The

input

level

of

the

unwanted

signal

is more

than

l0 mV

which

suppress

the

output

level

of

the

wanted

signal

by 3

dB,

under

a condition

where

the

unwanted

signal

is

separated

by

2OkHz

or

more

from

the

wanted

signal

of l0pV.

(SSB

mode,3kHz,

AGC

ON)

!

't

'.

1

-'"

r

û''1

i._;-

\

.'J

'!."1

.

!

I.

d'l

o,t t,g

1,'i:

-3-

l3)

Cross-modulation
The cross-modulation

output,

which

is

generated

when

the 20 kHz

detuned

unwanted

signal

of 90

dB

is added

at the

wanted

signal

of

60 dB,

is

30 dB

or

less fbr

the

wanted

signal

or"rtput.

I4)

Interrnodulation
The

second or

third intermodulation

output,

which

is

generated

when

the

two 80

dB

interference

waves of 20

kHz

detuned

are

added,

is

below

the wanted

signal

output.

l5)

AGC

characteristic

The variation

of the

AF or-rtput

is l0

dB

or less

for

the

antenna

input

level

of

3

pV

to

100

rnV.

l6)

AF characteristics

Speaker output
Line output

Headphone

output

Frequency

response

Distortion

factor

l1)

Radiation

I x

lO-eW

or less

l8)

Norninal input

impedance

50-75

ohrns

l9)

Variable range

of BFO

!2

kRz

or more

20)

Variable range

of

Clarifier

t50

Hz or

more

2l)

Power

supply

AC

power

supply

100/110/200

l220Ytl0%

50160

Hz

approx. 30vA

DC

power

supply

24V!10'/o

(negative

grounded)

approx. 25W

22)

Temparature range

and

relative

humidity

-10"C

to

+50oC,

9s%

at

+35oC

23)

Dimensions

and

weight

Without the

cabinet case

149(H) x 480(W) x

294(D)

excluding

protuberence

Approx. j ke

With the

cabinet case

190(H) x 489(w) x

305(D) excluding

protuberence

Approx. I1.5

kg

lW or more

(6000)

l

mW

or more

(6004)

lOmW

or more

(6004)

3 dB or

less at

the frequency

range

of 300 to

3000

Hz

Speaker output

3% or

less

at

500mW

Line output

3%

or less

at I mW

-

4-

2. COMPOS|TION

2.1

STANDARD COMPOSITION

The composition

of

this

receiver

depends

on its

type,

that is, desk-mount

type or rack

type.

*

Spare

parts

include:

One

each

of BK

relay,

and

fuses.

2.2 OPTIONS

Remarks

Provided

for

only the

desk-mount

type

600a lw

Provided

for

only the

desk-mount

type

t

NRD-9

I

MPBX I

083 2

NVA-92

'ZCJDOOOO5

MPKCO3

I 08

M-P_7

6ZXJD5IO43

Receiver
Cabinet case

Speaker
Power cable
BK cable
Instruction manuâl
ANT Connector

Spare

parts

Test data

Item

Model or

code Remarks

Headphones

I

ST-3

|

600 ohms

DC

power

cable

MPKCOI74I I For

DC24V

Extension card

fbr maintenance I CMH-330

|

Used for

checking

each

PC

boad

| |

in

operation

Additional

cr1'stal

| |

Crystal to

be mounted

in

the

AUX

position
In case of FSK 456.7 kHz
In

case

of

FAX

456.9 kHz

-5--

3.

INSTALLATION

3.1

INSTALLATION
(

I

)

When installing the receiver

on the

l9-inch

standard

rack,

place

the

guide

bolt

provided

on the

side

of

the

chassis

on

the rails,

and

push

the receiver

to the

inside

of the rack.

Then, flx

the receiver

in

position

by

screwing

the

5-rnm

screws

through

the mounting

holes

at two

positions

of

both

left

and right

sides

of the front

panel.

(2)

When installing

the

receiver

on the

desk,

Llse

the special

cabinet

(optionally

available

on

separate order).
Attaclt the slide rails

(supplied

with

the

cabinet

case) onto

left

and right

sides

of

chassis

of the receiver

and mount

the receiver

in the

cabinet

case.

Fix

the receiver

to the

cabinet

case

by

screwing

the 5-mm

screws

through

four mounting

holes

on

the front

panel.

3.2 ANTI-INDUCTION

OF THE

TRANSMITTING

WAVE

When the receiver

is operated

with

a

paired

transmitter,

it sometimes

happens

that

the

transmitting

wave of own

station is

induced

in

the receiving

antenna.

When

the induction

current

of the

transmitting

waves is

I ampere

or less,

the receiver

is

protected

by the built-in

input

protective

circuit.

But if the

induction

current

exceeds

I

anlpere, the input

circuit

of

the receiver

may

be

burnt out.

When

the

receiving

antenna suf-fers

fiom

such

an excessive

induction

current, move

the

receiving

antenna

as

far

as

possible

trom

the

transmitting

antenna, or

insert

the anti-inducer

in

series

betweetr

the receiving

autenna

and

antenna input

connector

as shown in Fig.3.l.

Receiving

antenna

l00v

60w 100v

I

60w

I

PL1

01 PL1

02

|

l/\l

i- ç?(e}

-{çf-'-_----_--..
a-f

­#to'

Q

-

to

tne[Àtrtrlconnecter

rl
ll

L_

__J

AW-01

'18

Anti-inducer

Fig. 3.1

Protection

of the

Receiver

by the

Anti-inducer

3.3 CONNECTION

OF

EXTERNAL

LINES

(l)

This

receiver is

operable

in either

ACl00tlO%

(50/60

Hz)

or

DC24V!lO%.

For AC

operation, conrlect the

AC

power

cable to

[nC

tO()Vl

located

on

the

rear

panel

of the

nrair-t

tratne.

For DCI

operation,

connect

the

DC

power

cable

MPKCQ|74I

(option)

to

LO_.9_?4

located

on the rear

panel

of

the main frame.

-

6,

o

When

changing

the

power

voltage

at the

installation

place,

change

the terminal

connection

of

the

power

transformer

located

inside

the

chassis as shown

in Fig.

3.2. For

the

location

of the

transformer,

see the

annexed

part

arrangement

drawing.

Fis.3.2

(2)

Connect

the

antenna

cable to

the | ,ANT-I

connector

provided

at the

rear

panel.

(3)

Connect

the

grounded

wire

to the

terminal

H

on the rear

panel.

(4)

If the

break-in

relay

circuit

is to

be used,

connect the

special

cable

(MPKCO3

108)

to

the

tBK

&

Lin[Êl

connector.

The AF

output

signal

(600S,

unbalanced

speaker

output,

and

600O

balanced

line

output)

can be

also taken

out

from

this connector.

See Fig.

3.3 for

details.

AC

power

Headphones

ST*3

(Option)

DC

power

I
I

I
I

I

I

rT1

I
I
I
I

I

I
I
I

1Oo/o

I

I

I

I

I

20vAC2

o

E xterna

I

Speaker

NVA-92

Line

output

(600f,l

balanced, 0 dBm)

To FAX.

Tape

recorder,

FS demodulator,

etc.

Fis.3.3

-7

-,

AC200Vr

l Oolo

NRD-91

Rear

panel

?lt- rr

9ilL5t I

\

Item

Indication

Cable

and connector

Pin

Color

Explanation

I

AC

I OOV,

r

t0v

200v,
220V

Connector

HS l6P-2

Cable 6ZCJDO0005

I

White For

AC

power

input

The cable

is attached

with the

receiver,

only

when

the receiver

is mounted

in

the cabinet

and

shipped.

2

Black

2

DCz4V

Connector

HS l2P-2

Cable

MPKCO

17

4l

I

White

+24V

For DC

power

input
Cable is
option.

2

Black

OV
(grounded)

3

ANT

M-P-3ls

17

Antenna

input

4

BK&
LINE

Connector

S- 13

I2-CEA

Cable

MPKCO3l08

I

White

-BK

(key

signal)

2

Red

+BK

(BK

power +24Y)

3 Black

E

600s}

unbalanced

lW

output

4

Green

Speaker

5 Silver

Shielded

(common

ground)

6

Not used

7

White

Line

600s,

balanced, 0

dBm

AF output

8 Red

Line

9

Black

Center tap

l0

Green Not

used

ll Silver

Shield.ed

(common

ground)

t2

Not

used

-8-

3.4

HOW

TO MOUNT

AUX CRYSTAL

By

adding the crystal to

the AUX mode

position,

the center frequency

of the

line

output can be 1.7 kHz

in case of FSK reception

and I .9

kHz

in FAX

reception

when setting

the frequency

indication

on the

panel

to the wanted receiving frequency,

and

this line

output

can be connected to FS demodulator

or FAX.

The

frequency

of the crystal is

456.7

kHz in FSK reception

and

456.9kH2

in FAX reception.

Since

this receiver

has one

AUX crystal

space,

one of FSK, FAX

or other

desirable

mode is

available.

Please

inform us

of

your

desirable

mode or the

frequency

of the

crystal

when ordering.

Mount

the crystal according to

the

following

procedures.

I

. Insert the crystal into

AUX

(X3)

on CMH

-379

IF

2nd

unit and solder it.

2.

Connect two holes

(AUX)

positioned

near

the

connector

(PlO)

on the

same unit by

means of the

leading wire.

3.

Connect

the speaker and

turn

on the

power.

If

the beat

sound comes out through

the speaker when

setting the

mode

to AUX, the

crystal is mounted

correctly.

Note) The beat

sound can

be easily

known

by

comparing

the noise

in AUX mode

with the noise

in DSB

mode, because the noise increases when

changing the

mode

from

DSB

to AUX.

-9 -

4.

OPERATION

4.1

OPERATION

PANEL

[Jmll

runo-sr

lnecrtven

|

| | rr^hr

i:i

!:,

,='11

k-3,--

- |

r

MH,

'-

'-rH,

BANDW'FT"

J

BFO & CLARIFIER

ON

REJECT

0t

OFF

OFF

RF

GAIN

AF

GAIN

AGC

I

pOWER

PEAKER

sr-ow$

/orl

g

OFF/ T

DC

No.

Control

Function

I

Meter

Indicating

the

strength

of the receiving

waves

or

level

of the

AF output

(line

output)

2

DIMMER

knob

Used

for

adjusting

the

brightness

of all LE,Ds.

Adjust

the

brightness

by this knob

according

to

the

circumstance.

LEDs

fade

out

if this knob

is turned

fully

counterclockwise.

Keep

this

in

your

mind

when

using

this receiver.

3

Receiving

frequency

indicator

Displaying

the

receiving

numbers.

In

case of

SSB

displayed

and

in

case of

frequency

is

displayed.

frequency

by

6-digit

numerical

mode,

the

carrier frequency

is

modes

other

than

SSB, the assigned

4

BANDWIDTH

indicator

Displaying

the

bandwidth

of the IF filter

specified

by

the

BANDWIDTH

A

selector

switch

(one

of

0.5 kIHz,3

klHz

and 6 kHz)

5 MODE

indicator

Displaying

the

mode

specified

by the

MODE

switch@

(one

of

SSB, CW,

DSB

and

AUX)

-

l0

-

No.

Control

Function

6

MODE selector Used for selecting the

reception *oà.

(one

of

SSB, CW, DSB

and AUX).

When

changing the mode from

one of

AUX,

DSB

and CW to

SSB,

the

frequency obtained

by

subtracting

1.5 kHz from

the

original

frequency

is displayed

on the

frequency indicatorO

. This

is

because that the

carrier

frequency

is displayed in case of SSB

reception.

Since AUX

is option,

make

a special order if

necessary.

If this AUX

mode

is specified when the optional crystal is not mounted,

actual reception mode is DSB even though

the AUX mode

is

indicated by the

MODE

indicator.

1 BANDWIDTH

selector

Selecting the bandwidth of

the

IF

filter

(intermediate

frequency)

(one

of

0.5 kHz,3

kHz

and

6

kHz).

8

METER selector
switch

Selecting

the

content

to be indicated

for

the meter(D.

When

setting this switch to

S,

turning

RF

GAIN

@

fully

clock-

wise, and

setting

the AGC

switch @ to FAST or

SLOW,

the meter

pointer

indicates the

relative signal

strength of

the

HF input of the

receiver.

When

setting

this switch to

LINE, the meter indicates

the line output level

(6000

balanced).

9 SPEAKER

jack

Used

for

connecting

the

special speaker,

NVA-92

or the

speaker

of 600C1 impedance.

l0 PHONES

jack

Used for

connecting

headphone

of 600C2

the optional headphones,

ST-3 or the

impedance.

ll

MHz selector

Used for setting the MHz

digit of the receiving

frequency.

The full rotation

of this knob

covers 30 bands

(

I MHz

step).

t2

BFO & CLARIFIER

knob

Serving

as BFO

adjustment

knob in

case of

CW mode.

This

knob

can vary the frequency of

45 5

kHz

beat oscillator

(BFO)

by more

than

t2

kIIz.

Therefore,

the tone

of the

telegraph signal

can be adjusted.

This

knob

also serves

as a

fine

adjustment knob

(CLARI-

FIER) of

the

receiving tiequency

in SSB

and AUX modes.

This can vary the

center

frequency

of

the oscillating

fiequency by more

than

t50

Hz.

l3 RF GAIN

knob

is

Gain controller

for

the RF

amplifier and IF amplifier.

It

recommended

to adjust according to

the

strength

of

the

receiving

signal for

obtaining the optimum volume.

t4 TUNE

knob Used for

setting the receiving frequency in 100 Hz

steps.

The

full rotation

changes the

receiving frequency

by l0 kHz.

l5

UP/DOWN

switch

Fast forward

switch of the receiving frequency.

While

pressing

UP

(or

DOWN),

the

fiequency

increases

(or

decreases) at a speed

of approx. 125 kHz/second.

-

ll

-

No.

Control

Function

t6 LOCK

switch

Used for

locking

the set frequency

electrically

so

as not

to

be

changed

by

careless misoperation.

By setting

this

switch

to the locked

condition

(pressed),

the

receiving

frequency

will

not

be changed

even

though operating

the TUNE

knob

@

and UP/DOWN

switch

@

.

f'or

releasing

the locked

condition,

press

this

switch

again.

l1

AF GAIN

knob

This is a volume

adjustment

knob for

the speaker

or

headphones.

And this

knob

does

not

af'fect the level

of

the

line

output

(600O

balanced) on

the

rear

panel

of

the

receiver.

t8

Attenuator

switch Used for

selecting

the

ON

or

OFF

condition

of the 20

dB

HF

attenuator for

the receiver

input.

Set this

switch

to ON

for

the

better reception

when

the signal is received

at the

near distance

and the desired

signal is interfered

due

to

the

strong neighboring

signals

etc.

But usually,

set this

switch

to the OFF

position.

t9

AGC

switch

Used for

selecting

the

ON or

OFF condition

of the

AGC

circuit

and selecting

the discharging

time

constant.

The FAST

position

is

for

the reception

of DSB

signals,

and the

SLOIV

position

is normally

f

or

the reception

of

CW or

SSB

signal

affected

by

fading.

By setting

this switch

to OFF,

the

AGC circuit

remains

inoperative

and signals

are saturated.

Thus,

control

the

gain

by

the RF GAIN

knob

@

for

the best

receiving

condition.

20

BC BAND
REJECTOR

Set this switch

to

ON

for

the

better reception

when

the

cross-modulation

or

intermodulation

due

to the strong

radio

wave

of the

broadcasting

wave

(525

to 1605

kHz)

interferes

the MHF

reception.

2l POWER

switch

Used for

turning

ON or

OFF the

power.

Also used for

selecting

AC or DC

power

supply.

4.2 OPERATING

PROCEDURES

Before turning

on the

power

switch,

check the following items.

(

I ) Power

voltage check

The

label, which shows the nominal

power

voltage,

is

placed

above the

power

connector

located on the

rear

panel

of

the receiver.

Check

that the

power

voltage

to be

used

is

within the

range of the nominal

value

!lO%.

(2)

Antenna

system check

Check that each connecting

part

of the

antenna cable to

be connected

to

this

receiver

is

firmly

connected. When the antenna

coupler

and antenna

changer are used,

check that

they are correctly

set

*-t2-