JRC NRD 91 User Manual

2 REV.

o+

INSTRUCTION

RECEIVER

MANUAL

O*

@

flrytnadioCo.,Ild.

MODEL

OUTSIDE

NRD-91

VIEW

RECEIVER

(DESK-MOUNT

TYPE)

ôffiË

o o

#

û

MODEL NRD-91 RECEIVER

OUTSIDE VIEW

(CONSOLE

OR

ô

RACK TYPE)

CAUTION

CONTENTS

1. GENERAL

1.1

FEATURES

1.2

SPEC|F|CAT|ONS

2.

COMPOSTTTON

2.1

STANDARDCOMPOSITION

2.2

oPTtONS

3.

INSTALLATION

3.1

INSTALLATION

3.2

ANTI-INDUCTION

3.3

CONNECTION HOW

3.4

4.

OPE RATION

4.1

4.2

4.2.1

4.2.2

4.2.3

4.2.4

4.2.5

4.2.6

TO

OPERATION PANEL OPERATINGPROCEDURES

Basic

Basic Operation Operation Operation Operation Further

DESCRIPTION

. . . . . .

OF EXTERNAL

MOUNT

AUX

Operation

of DSB of FSK of FAX

Operation

OF THE

TRANSMITTING

CRYSTAL

of of

Reception Reception

Reception

LINES

SSB Reception CW

Reception

. .

.

WAVE

2 2 2

5 5 5

6

6 6 6 9

l0 l0 t2 l3 l3 l3

t4 t4 l5

CIRCUIT DESCRIPTION

5.

RECEIVING SECTION

5.1

5.2

LOCAL SIGANL

PANEL

5.3 POWER

5.4

MAINTENANCE

6.

GENERAL

6.1 GENERAL MAINTENANCE

6.2

6.3 TROUBLESHOOTING

6.3.1 Decline of the

SECTION

SUPPLY

GENERATOR

SECTION

Sensitivity

SECTION

AND CHECK

-l-

t6 t6 l6 t7 l8

t9 t9

.

t9 20 20

6.3

.2 No

6.3.3

Sound . . .

NoiseandBeat

6.3.4 Interference by the

6.3.5

Intermodulation

Appendixed Drawings

Transmitter

of

Parts Arrangements

Diagram

Block Outline

Circuit

Speaker

Drawing

Diagrams

Unit

Your

Station

....

2L

.21

22 23

-ll-

CAUTION

l. Read

2.

3. When the

4.

5.

6. This

1. If

this instruction

When

connecting

measure

Do not turn mounted preadjusted

If knob must be

switohes equipments.

receiver operates

front

MHz

the

receiver

the

AUX

panel.

manual thoroughly before turning on

the BK cable and

transmitting

described

semifixed

the

on

at the

knob

set

has low-voltage-operable

when connecting

mode

waves are strongly

in Paragraph 3.2.

resistors, high frequency transformers, trimmer capacitors, etc.

printed factory.

is set at inadequate

correctlv.

is

actually

circuit board

or removing the

selected at a condition

in the DSB mode even though the AUX

this receiver.

other cables, refer to Fig. 3.3 of

induced in the receiving antenna, take the

unless

position,

ICs and transistors. Be sure to turn

absolutely

receiver is muted.

the

printed

where

additional

necessary,

circuit board and cables to external

Paragraph

crystal

mode

3.3.

counter-

off both

provided,

not

they

are all

because

Therefore, the

is

is indicated on the

MHz

power

the

8. The gradually

completely

().

When

000.0kH2 the played

10. When 3000

illumination

reduced as

at the minimum

the ntode

and 001.4kH2,

display

| .4kHz

of MHz Selector

by LED.

the rnode

and

of LEDS

turning

is

except

is except SSB,

lower limit

the

(Receiving

f-DlMMEil

position.

SSB

MHz

Switch.

frequency,

knob

and Frequency

displays the

LED

In

such

.5

kHz.

limit of

the upper

is

001

Mode

counterclockwise.

Display frequerlcy

a case, Receiver

the received

and Bandwidth

shows

obtained by adding

fiequency

indicators) is

Finally they

the tiequency

receives the frequency dis-

to

fade

between

lMHz to

be

displayed

out

is

-l-

1.

GENERAL

The

model

position,

syuthesizer setting, receiver.

1.1 FEATURES

developed

is equipped

so that

I

Provided

)

The reference fiequencies

2)

Wide This receiver

3)

Digital This receiver receiving

Therefore,

4)

BC band BC band rejector due to MHF

5) Directly The line output or output

6) Entirely The panel

1)

Operable The receiver panel.

this receiver

receiving frequency

indication

the

radio

FAX

is 1.7

circuits are accomodated

section

DESCRIPTION

NRD-91

by JRC

with

over

covers

frequency

the frequency

rejector

strong radio

wave.

connected

can be received

modular

either

on

can be

Receiver

based

in

the first

has

digital

oscillator

is

kHz

and

synthesizer

a

wide frequency

the wide

of

receiving

provided

from

reduces

to

Teleprinter

terminal,

and l.9 kHz

construction

power

AC or

operated

is a highly

on

our many

local

oscillator

enough

with

range

with

100

can be set

the interferences

wave

600St

in

the

supply

DC

performances

of PLL

the high

receiving

frequencies

Hz

of

AUX mode. respectively.

in

unit).

power

on

stability

range

frequency

light

emitting

digit

to l0

correctly.

the

broadcasting

and FAX

0 dBm,

plug-in

the

Thus, maintenance

AC

or DC

reliable

year's

type

for

such

provided.

is

experiment

prvode

to

for

(t5

reception.

range

diodes

MHz

as

At this time,

type

power

receiver

use

x

digit.

cross-modulation

wave

printed

by changing

with the

the high

in the

l0-6ppm)

from

for

generating

By

adding the

the

circuit

and

technical

accuracy

SSB mode

ensures

90 kHz

a numerical

optional

center

frequency

boards

check are

the

simple

to 29.9999

and intermodulation

during

power

circuit

results.

of

frequency

as a

back-up

high

stability

MHz.

display

receiving

crystal, FSk

of

the line

(excluding

facilitated.

switch

com-

PLL

of

of the

the

on

the

1.2

SPECIFICATIONS

I ) Receiving frequency

9O kHz

2)

Circuit system Double frequency

I st

2nd IF Reception

3) CW(AlA),

(F3C)

to 29.9999

superheterodyne

lF- : 7 0.45

:

range

MHz

synthesizer.

5 MHz

455 kHz

mode

MCW(A2A,

with

HzA),

up-conversion

DSB(A3E),

,2-

system

SSB(R3E, H3E,

using

phase-locked

a

J3E)

and FSK(FlB)

digital

or FAX

FSK and

But Receiving

4) emitting

Light Tuning

5) Continuous

rotation

6) Sensitivity

method

(minimum

FAX are

frequency

diode

tuning

option.

indication

for six-digit

with MHz

steP:

100 Hz)

numerical

knob,

UP/DOWN

display

(

MHz- to

I 0

switch

{

Hz- digit)

100

and TUNE

knob

of l}kHzl

------_-_ Receivùg

frequency

90-

200-

1.6-29.9999

15çt

Output 100

1)

Selectivity

-\!tenuation BandwidÈ=--=-

Mode

-----

199.9

1599.9

standard

kHz

6

kHz 2-2.6

3

kHz

0.5

kHz

MHz

signal

Bandwidth

rnW,

generator

2O

l0

2

3 kHz,

6 dB

4.4

AIA

pY

or

pV

or

pY

or

directly

is

400 Hz

bandwidth

or

kHz

1.0

0.5-

less 60 less less

more kHz

30

6

connected

30%

kHz

A3E

pV

pV pV

modulation.

60

less

or

less

or

less

or

to

bandwidth

dB

kHz

l0

6 kHz 3 kHz

the

or or

or less

pV

3

antenna

less less

J3E

or less

terminal

't

!

r

-'"

.'J

\

o,t t,g

S/N

'.

1

û''1

'!."1

.

!

20

dB,

i._;-

d'l

I.

1,'i:

Frequency

8) I hour

receiving

the

9)

Image

60 dB IF

l0)

60 Spurious

I l)

60

12) Blocking The level separated AGC

rejection or

rejection

or

dB

dB or

input

of

ON)

stability

l5-1rilute

after

frequency

more

ratio

n-lore

response more

level

wanted

the

by

ratio

the

of

2OkHz

preheating

MHz or

is 1.6

)

unwanted

or

by 3

more

signal

signal dB,

from

t

10 x l0-6

in

more

is more

under

wanted

the

-3-

less,

or

than

signal

mode.

l0 mV

the SSB

a condition

under

but

which

where

of l0pV.

the

suppress

unwanted

the

(SSB

condition

the

signal

mode,3kHz,

where

output

is

l3)

Cross-modulation The cross-modulation signal

signal

I4)

Interrnodulation The interference

l5)

AGC The variation

l6)

AF characteristics

Speaker output Line output

Headphone

Frequency Distortion

l1)

Radiation

l8)

Norninal input 50-75

l9)

Variable range !2

20)

Variable range t50

2l)

Power AC DC

22)

Temparature range

-10"C

23)

Dimensions Without the

149(H) x 480(W) x

With the

190(H) x 489(w) x

of 90

or"rtput.

second or

characteristic

100

rnV.

I x

lO-eW

ohrns

kRz

or more

Hz or

supply power power

to

output

response

factor

or less

more

supply supply

+50oC,

and

cabinet case

output,

dB

is added

third intermodulation

waves of 20

of the

impedance

of BFO

of

Clarifier

9s%

weight

at the

kHz

detuned

AF or-rtput

lW or more l

mW

or more

lOmW 3 dB or Speaker output Line output

100/110/200

24V!10'/o

relative

and

+35oC

at

294(D)

305(D) excluding

excluding

which

or more

(negative

humidity

is

wanted

output,

are

is l0

dB

(6000)

(6004)

less at

the frequency

3%

l220Ytl0%

protuberence

generated

signal

of

which

added,

or less

3% or

or less

grounded)

is

for

less

at I mW

50160

when

the 20 kHz

60 dB,

at

is

generated

is

below

the wanted

the

antenna

range

500mW

Hz

approx. 30vA

approx. 25W

Approx. j ke

Approx. I1.5

30 dB

of 300 to

or

when

input

detuned less fbr

the

signal

level

3000

kg

unwanted

the

two 80

output.

of

Hz

wanted

dB

pV

3

to

-

4-

2. COMPOS|TION

2.1

STANDARD COMPOSITION

The composition

type.

Receiver Cabinet case

Speaker Power cable BK cable Instruction manuâl ANT Connector

parts

Spare Test data

*

2.2 OPTIONS

Spare

parts

include:

of

One

receiver

this

NRD-9 MPBX I

NVA-92

'ZCJDOOOO5

MPKCO3

M-P_7

6ZXJD5IO43

each

of BK

depends

I

083 2

I 08

relay,

and

on its

fuses.

type,

that is, desk-mount

Provided type

for

600a lw

Provided type

t

for

Remarks

only the

type or rack

desk-mount

Headphones

power

DC Extension card

Additional

cable

cr1'stal

Item

fbr maintenance

Model or

ST-3

I

code Remarks

MPKCOI74I I For

CMH-330

I | | | |

600 ohms

|

DC24V

Used for

|

in

operation

Crystal to

AUX In case of FSK 456.7 kHz In

position

case

checking

be mounted

FAX

of

each

456.9 kHz

PC

in

boad

the

-5--

INSTALLATION

3.

INSTALLATION

3.1 (

I

When installing the receiver

)

on the Then, flx holes

at two

(2)

When installing

of

side

the receiver

positions

separate order). Attaclt the slide rails of the receiver

by

case

screwing

and mount

the

chassis

in

of

receiver

the

(supplied

the 5-mm

on the

on

the rails,

position

both

left

and right

by

on the

with

the receiver

screws

through

l9-inch

and

screwing

desk,

Llse

the

cabinet

in the

standard push

sides

rack,

the receiver

the

5-rnm

of the front

the special

case) onto

cabinet

case.

four mounting

place

to the

screws

panel.

cabinet

left

Fix

the receiver

holes

on

guide

the

inside

through

(optionally

and right

the front

provided

bolt

of the rack.

the mounting

available

sides

of

chassis

to the

cabinet

panel.

on

3.2 ANTI-INDUCTION When the receiver

transmitting

When

protected anlpere, the input

When

receiving in

series

Receiving

wave of own

the induction

by the built-in

circuit

receiving

the

antenna

betweetr

antenna

as

the receiving

OF THE

is operated

current

antenna suf-fers

far

as

i- ç?(e}

-{çf-'-_----_--..

TRANSMITTING

paired

a

in

transmitting

may

station is

of the

input

of

protective

the receiver

with

induced

fiom

possible

l/\l

trom

autenna

l00v

60w 100v

01 PL1

PL1

the

and

antenna input

a-f

WAVE

transmitter,

the receiving

waves is

circuit.

be

such

But if the

burnt out.

an excessive

transmitting

I

60w

I

02

|

#to'

antenna, or connector

it sometimes

antenna.

I ampere

or less,

induction

insert

as shown in Fig.3.l.

Q

happens

current

current, move

the anti-inducer

-

rl ll

L_

AW-01

'18

Anti-inducer

__J

that

the

the receiver

exceeds

the

to

tne[Àtrtrlconnecter

is

I

3.3 CONNECTION (l)

receiver is

This For AC

of the

(option)

operation, conrlect the

nrair-t

to

LO_.9_?4

Fig. 3.1

EXTERNAL

OF

operable

tratne.

Protection

in either

For DCI

located

of the

Receiver

LINES

ACl00tlO%

power

AC

operation,

on the rear

-

6,

by the

(50/60

cable to

connect

panel

of

Anti-inducer

Hz)

[nC

the

DC24V!lO%.

or

tO()Vl

DC

located

power

the main frame.

on

cable

rear

panel

the

MPKCQ|74I

When

changing connection the

location

of

the

of the

power

the

power

transformer

transformer,

voltage

see the

at the

located

annexed

installation

inside

the

part

arrangement

place,

change

chassis as shown

drawing.

the terminal

in Fig.

3.2. For

o

(2)

Connect

(3)

Connect

(4)

If the

tBK

600O details.

the

grounded

the

break-in

Lin[Êl

&

balanced

I

20vAC2

antenna

cable to

relay

circuit

connector.

line

output)

1Oo/o

wire

AC200Vr

the | ,ANT-I

to the

is to

terminal

be used,

The AF

can be

l Oolo

Fis.3.2

connector

H

connect the

output

signal

also taken

provided

on the rear

special

(600S,

out

unbalanced

from

this connector.

I I

I

rT1

I I I I

I

I I I

at the

panel.

cable

panel.

rear

(MPKCO3

speaker

output,

See Fig.

108)

to

the

and

3.3 for

o

DC

AC

power

E xterna

power

I

NRD-91

panel

Rear

Fis.3.3

-7

-,

Line

output

To FAX.

Headphones

?lt- rr

9ilL5t I

Speaker

(600f,l

recorder,

Tape

(Option)

ST*3

\

NVA-92

balanced, 0 dBm)

FS demodulator,

etc.

Item

Indication

Cable

and connector

Color

Explanation

I

2

3 4

I OOV,

AC

r

t0v

200v, 220V

DCz4V

ANT BK&

LINE

Connector

HS l6P-2

Cable 6ZCJDO0005

Connector

Cable

M-P-3ls

HS l2P-2

MPKCO

17

4l

Connector

S- 13

I2-CEA

Cable

MPKCO3l08

I

White For

2

Black

I

White

2

Black

I

White

2

Red

3 Black

4

Green

5 Silver 6

power

AC

The cable receiver,

is mounted

shipped.

is attached

only

+24V

OV (grounded)

Antenna

-BK

+BK

input

(key

signal)

(BK

power +24Y)

E

Speaker Shielded Not used

(common

input

when

the receiver

in

the cabinet

For DC

input Cable is option.

600s}

unbalanced

lW

output ground)

with the

and

power

7

White

8 Red 9

Black

l0

Green Not

ll Silver

t2

Line Line Center tap

used Shield.ed Not

(common

used

600s,

balanced, 0 AF output

ground)

dBm

-8-

3.4

HOW

TO MOUNT

AUX CRYSTAL

adding the crystal to

By output can be 1.7 kHz the frequency output

456.7 AUX crystal of

I

. Insert the crystal into

2.

3.

can be connected to FS demodulator

kHz in FSK reception

your

desirable

Mount

Connect two holes means of the Connect

the beat

If crystal is mounted

Note) The beat

indication

space,

the crystal according to

the speaker and

with the noise mode

one of FSK, FAX

mode or the

leading wire.

sound comes out through

from

the AUX mode

in case of FSK reception

on the

AUX

(AUX)

turn

correctly.

sound can

in DSB

DSB

panel

456.9kH2

and

frequency

the

(X3)

on CMH

positioned

on the

be easily

mode, because the noise increases when

to AUX.

to the wanted receiving frequency,

in FAX reception.

or other

of the

following

-379

near

power.

the speaker when

known

position, and I .9

or FAX.

desirable

crystal

procedures.

the

kHz

when ordering.

2nd

IF

connector

by

comparing

the center frequency

in FAX

The

mode is

unit and solder it.

setting the

reception

frequency

this receiver

Since

available.

(PlO)

on the

mode

the noise

of the crystal is

Please

in AUX mode

of the

when setting

and

same unit by

to AUX, the

changing the

line

this line

has one

inform us

-9 -

4.

OPERATION

4.1

OPERATION

runo-sr

[Jmll

PANEL

lnecrtven

i:i

r

|

MH,

!:,

'-

,='11

'-rH,

| | rr^hr

k-3,--

BANDW'FT"

- |

J

No.

I

2

3

PEAKER

Meter

DIMMER

Receiving

indicator

Control

knob

frequency

BFO & CLARIFIER

RF

GAIN

Indicating AF output

Used

for brightness LEDs

fade

Keep

this

Displaying numbers. displayed frequency

the

strength

(line

output)

adjusting

by this knob

out

in

the

In

and

is

the

if this knob

your

mind

receiving

case of

in

case of

displayed.

AF

GAIN

Function

of the receiving

brightness

according

is turned

when

using

frequency

SSB

mode,

modes

the

other

ON

REJECT

0t

OFF

sr-ow$

waves

of all LE,Ds.

to

the

fully

this receiver.

by

6-digit

carrier frequency

than

OFF

AGC

I

/orl

OFF/ T

or

Adjust

circumstance.

counterclockwise.

numerical

SSB, the assigned

pOWER

g

DC

level

the

is

of the

4

BANDWIDTH

indicator

5 MODE

indicator

Displaying BANDWIDTH

and 6 kHz)

Displaying

(one

the

of

SSB, CW,

-

l0

bandwidth

selector

A

mode

specified

DSB

and

-

of the IF filter

switch

AUX)

(one

by the

of

MODE

specified

0.5 kIHz,3

switch@

by

the klHz

No.

Control

Function

6

MODE selector Used for selecting the

1 BANDWIDTH

selector

METER selector

8

switch

reception *oà.

changing the mode from

and AUX). DSB

and CW to

1.5 kHz from frequency indicatorO frequency is option, mode actual reception mode is DSB even though is

indicated by the

Selecting the bandwidth of frequency)

Selecting setting this switch to wise, and the meter

HF input of the

the

LINE, the meter indicates

balanced).

When

frequency obtained

the

SSB,

the

original

is displayed in case of SSB

make

a special order if

is specified when the optional crystal is not mounted,

MODE

(one

the

setting

pointer

0.5 kHz,3

of

content

the AGC

indicates the

frequency

is

. This

to be indicated

turning

S,

receiver.

because that the

indicator.

IF

the

kHz

RF

switch @ to FAST or

relative signal

When

the line output level

(one

one of

is displayed

reception.

necessary.

the AUX mode

(intermediate

filter

kHz).

6

and

for

the meter(D.

GAIN

setting

@

this switch to

of

by

If this AUX

strength of

SSB, CW, DSB

AUX,

subtracting

on the

carrier

Since AUX

When

fully

clock-

SLOW,

(6000

9 SPEAKER

l0 PHONES

ll

t2

MHz selector

BFO & CLARIFIER

jack

knob

l3 RF GAIN

t4 TUNE

knob Used for

jack

knob

for

Used

speaker

Used for

headphone

Used for setting the MHz The full rotation

Serving knob

(BFO) telegraph signal This

FIER) of This can vary the

fiequency by more Gain controller

recommended receiving

The

connecting

of 600C1 impedance.

connecting

of 600C2

as BFO

can vary the frequency of

by more

knob

also serves

receiving tiequency

the

signal for

setting the receiving frequency in 100 Hz

full rotation

the

the optional headphones, impedance.

of this knob

adjustment

t2

than can be adjusted.

as a

center

than

for

the RF

to adjust according to

obtaining the optimum volume.

changes the

special speaker,

digit of the receiving

covers 30 bands

knob in

45 5

kIIz.

Therefore,

fine

adjustment knob

frequency

t50

Hz.

amplifier and IF amplifier.

receiving frequency

NVA-92

case of

kHz

in SSB

of

CW mode.

beat oscillator

the tone

and AUX modes.

the oscillating

strength

the

ST-3 or the

frequency. (

or the

I MHz

(CLARI-

step).

This

of the

It

of

the

steps.

by l0 kHz.

is

l5

UP/DOWN

switch

Fast forward

pressing

decreases) at a speed

switch of the receiving frequency.

(or

UP

-

DOWN),

-

ll

While

fiequency

the

of approx. 125 kHz/second.

increases

(or

No.

Control

Function

t6 LOCK

l1

t8

t9

20

AF GAIN

Attenuator

AGC

BC BAND REJECTOR

switch

knob

switch Used for

switch

Used for be to the locked will

@ condition,

This is a volume headphones. line

receiver.

HF for near distance strong neighboring to the OFF

Used for circuit

The FAST and the

CW or

to OFF, are saturated.

knob Set this switch

cross-modulation radio interferes

locking

changed

not

and UP/DOWN

output

attenuator for

the

by

careless misoperation.

condition

be changed

press

And this

(600O

selecting

better reception

and the desired

position.

selecting

and selecting

position

SLOIV

SSB

the

@

wave

position

signal

AGC circuit

Thus,

for

the best

to

of the

the MHF

the set frequency

this

adjustment

affected

ON

or

broadcasting

(pressed),

even

though operating

switch

knob

balanced) on

the

ON

the receiver

when

signals

the

ON or

the discharging

for

is

is normally

control

receiving

for

intermodulation

reception.

.

@

again.

knob for

does

or

OFF

input.

the signal is received

signal is interfered

etc.

But usually,

OFF condition

the reception

fading.

by

remains

the

better reception

wave

electrically

By setting

receiving

the

f'or

releasing

the speaker

not

af'fect the level

rear

the

condition

Set this

time

of DSB

f

or

the reception

By setting

inoperative

gain

by

condition.

due

(525

so

as not

this

frequency

the TUNE

the locked

or

panel

of

the

of the 20

switch

at the

due

set this

constant.

the RF GAIN

to the strong

to 1605

switch

of the

AGC

signals,

this switch

and signals

when

kHz)

to

switch

knob

of

the

dB

to ON

to

the

of

the

2l POWER

4.2 OPERATING Before turning

(

I ) Power

The located on the within the

(2)

Antenna Check that each connecting firmly they are correctly

switch

voltage check

label, which shows the nominal

system check

connected. When the antenna

Used for selecting

PROCEDURES

rear

set

power

panel

switch,

of

the receiver.

part

on the

range of the nominal

turning AC or DC

check the following items.

power

value

of the

ON or

power

voltage,

Check

!lO%.

antenna cable to

coupler

and antenna

OFF the

is

that the

*-t2-

power.

supply.

placed

above the

power

be connected

changer are used,

Also used for

power

voltage

to

connector

to be

receiver

this

check that

used

is

(3)

Check Check surely

(4)

Connect

of the connectors

each connector

that

connected.

heaclphone

the speaker

or

on the

and

panel

rear

grounded

to

wire on the

lspeaKf

nl or

rear

iranel

IFHONES-I

jack.

of the receiver are

4.2.1

4.2.2

Basic Operation

(l)

Set the graduations

(2)

Set thr of

(3)

Press ttre

(4)

Set the

the

tAF

FQ@

DC

desired

FÙnel

(5)

(6)

(7) (8)

(

I ) Set tn.

(2) (3)

(4)

(5)

the

Set

slow

t

After sound

I

hearing

volume.

Adjust the BFO & CLARIFIERknob so When the

knob slightly counterclockwise and

the

best S/N

Operation of CW

Basic

[11tQA|Nl

Press the Set the utro Press

Set the

desired receiving

lîulrtr

ttre

of SSB

GÀlN

fiom the mininlum

power

lSSe-l

receiving

knob.

the desired signal, turn

received radio

of the

button

ltw I

knob.

I

kHl button

lo.s

FFGAINI

Reception

knob

I

switch

supply.

button

amons

fiequency

knob to the maximum

wave is not strongly

reception

Reception

knob to 4 or 5

amons ilre

frequency

knob

to the

position.

to

[Ac]

the

voice.

(Morse

among

almost

position

in

where the

case of the AC

ltvtôOf l

by using the

the

tAFGÀiNl

as to

GAIN-l knob slightly

IAF

Telegraph)

graduations.

switches.

lrvrooe

I

by using

th.

M

to

the center

knob is

switches.

IMHil

position

set

the tone

affected by

the

lMHll

position

turned clockwise

power

supply, or to

knob,

and

turn the AGC

knob

and

the

fading,

knob,

switches.

and the

E

I-UPIDôW-NI

set it for

most natural

turn the

clockwise so

ttre

IÙP/DOWN-I

an

FF

as to obtain

trGôl

by 4 or 5

in case

switch and

switch to

optimum

to hear.

GAINI

switch

to

(6)

When

hearing the

Erc4l$

(7)

(8)

(9)

4.2.3 Operation of

(l)

(2)

(3)

adjusting

BV

Adjurt

When the received

f

RF

Inf

reciprocally, set the

GAINl

Press the

BANDWIDTH I switches.

Set the

Set the desired

l-RF

knob.

desired signal, set the volume to the optimum level by

knob

BFO & CLARIFIERknob, set the tone

the

Gatwl

receiving wave is

nn6

knob slightly clockwise.

DSB Reception

IDSBI

button amons

GÂlNl

receiving frequency by using the

knob

CÀitrtl so that

[RF

affected by

tÀGC-l

to the

I

maximum

-

S/N

fading

switch

MODTI

-

t3

most

the

of

or the strong wave

to

switches, and

position

receiving signal

the

I-SLôWI

and set

MHI knob,

f

or

i6

IUF/DOWN

pleasant

will be

and

|FÀST I

kHtl

the

tAGC-l

adjusting the

to hear.

the best.

weak

wave

are

turn

and

the

button amons

switch

lswitch

to

and

(a)

Bv

(5)

In case of

adjusting the I AF GAINI knob,

strong interference,

press

set

the volume

the

kHA button among

F

to the optimum

BANDWIDTH

level.

switches.

4.2.4 Operation of FSK A teleprinter and

Receive

(l)

Press

(2)

Select the and direct

(3)

Set the (fully

(4)

Set the desired

truNEl

(5)

After

volume,

(6)

Set the

(7)

Adjust

demodulator sarne Note)

FSK

the

signal in the

tn. I nuXl button amons f MoDEl

proper

modulation speed of

printing

telegraph, select

fÀcC-l

clockwise).

receiving frequency

knob.

receiving

required.

as

MEaER-l

t

the BFO

deflects

brightness.

When to

perfbrming

the narrow

BANDWIDÏHafter the circuit is connected once. Otherwise, it may happen

that the

Reception

FS demodulator

following

BANDWIDTH

an FSK

switch to

the siganl,

W

adjust tne

switch located

&

CLARIFIER

maximumly

the

band direct

phase

is out due to the difference of the

are adaptative

procedures.

to this receiver

But this mode

switches.

button in accordance signal under

and the f RF

by using

[-Âf

the

front

on

knob

and LEDs

teletype

printing

communication

reception.

CÂiN-l knob

th.

[@

GÂt[l knob so

panel

so that

of

both MARK

terminal, be sure not

with

In

knob,

of the FS

the

FUruEt

by connecting

delay

to receive

is option.

frequency

the

case of

to

the maximum

a

the narrow

trFDôWNl

as to

obtain

demodulator

meter

and

SPACE

this receiver

to change

time of the

filter.

FSK

signal.

shift width

position

switch

the

desired

to

fTUNtrl.

of

the

blink

in

band

and

FS

the

4.2.5

Operation

radio facsimile

A

Receive (l)

(2)

(3)

(4)

the

Press

ttre I nUX I button

Select the frequency facsimile such as weather facsimile,

Set the I AGCI switch

(fully

Set the

tTut\i-trI

(5)

After volume,

(6)AdjusttheknobsothatLEDsfortuning,locatedonthefront

panel

of the facsimile recorder,

in the same brightness.

FAX

of

FAX

proper

shift width of the

clockwise).

Reception

equipment

signal in the following

BANDWIDTH

desired receiving

knob.

receiving

as

the signal,

required.

is

also adaptative

amons

FAX

to

tFÂST-l

frequency

adjust

to

this receiver

procedures.

IMODEI

button in accordance

signal under

press

etc.,

and

the

by using

11s

l-Af

NFTI

[îU

But this mode

switches.

reception.

kHtl

F

GAIN

FF

the

IMHz

Celw

ut O

fîulUF2l

Tknob

to receive

is

also option.

with the modulation

In

case

knob

knob,

so

wiil

to the

UffiôWN

I

as to

light

I

the FAX

of the

maximum

obtain

the most brilliantly

signal.

speed and

broad band

position

switch

I

the desired

and

-14 -

4.2.6

FurtherOperation

(

I

Operation

)

The one. interferences such as that sometimes station is circuit cannot

N,

radio wave can receiving the

@

(2)

Operation While besides the intermodulation

(525

@,

of ATT.

receiving antenna

If many strong waves arrive at the high frequency stage

located very

receiving

the

except

of BC BAND

receiving

radio wave

1605

to

eliminator

an interferences, desired wave

BC BAND

(3)

Operation

discharging

The

suppress communication.

ISLOW

However,

to hear since

able

ship at a

the

to

fF-Àsr-].

REJECT

of AGC

the noise

position

I

the weak

catches

intermodulation,

the desired radio waves cannot be received

close

control

be received

radio wave below

at the

the MHF

interferences due

kHz). In

such a strong

condition

stand-by condition.

REJECT

of the desired station. These

such

filter

that the receiving condition

so

comparatively

is

switch

time constant

between

signal

the

receiving to

gain

When

seems

far distance

many kinds

blocking,

your

to

is

even

(below

band

a condition, by setting

located at

station,

radio

greatly

though

1.6 MHz,

3 MHz), many other radio waves may be received

to

the

strong,

the

better

after

position

radio wave affected

result.

at the

communications

give

promptly

is not recovered

and the one at a near distance

radio wave from

of

cross-modulation and

sound

the

wave.

improved. If

l-AT1-l

it is recommended to always set

strong radio wave of

ANT

In

input

is set to

circuit

will be remarkably improved. When the

the above-described

use

of AGC

in SSB

that the strong

yet.

Therefbre, when

the strong

well. Also, when

is distorted because

such a

case, by setting J ,Â1T I to

p

meter deflects,

trt.

called

are

BC

BAND

cross-modulation

the broadcasting wave

REJECT switch to

operates so

IATT-I

tSLôVln

mode enough

signal

by turns, set

is set to 3 sec.

by moderate

is received may not

communicating

the

one

to weak

of

so

Especially,

as

receiver,

the

on

arise, so

partner

the

the desired

IATTI

to reject such

together with

so

for the

pleasant

fading,

l-ÂGCl

AGC

when

to

and

as to

the

be

with

switch

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CIRCUIT

5.

DESCRIPTION

Refer to

receiver

5.1 RECEIVING

is

The

intermediate

signal

A passing passes

on

the operating frequency.The

signal

converted into filter with amplified amplified converted into a 2nd of three filters with amplified

The amplifed receiving respectively. (70.455

circuit takes out the

a synchronous detector.

the

BFO circuit and the demodulator The demodulated output

is

a AF electronic volume supplied fiom

The

used for output is approx. 0

panel.

The BK circuit is

station's transmitting (keying

the

antenna terminal.

receiver

the

composed

receiving

frequency

through

mixed

is

a by signal

by the 455

The AGC voltage for

kHz)

power

LINE AMP output

connecting to the tape recorder,

signal). When

is reduced

annexed

receiving,

of

SECTION

system is

of 90 kHz

the BK relay

the 35 MHz

with

the first

center

the

is mixed with

and 2nd

amplifier for

AF GAIN

IF

frequency

lst

IF

IF of 455 kHz.

bandwidth

kHz

carrier component

placed

dBm which

provitled

radio

-BK At

the speaker

and

blockdiagram

local signal

an

up-conversion

of 70.455

LPF

of

AMP.

IF AMP.

signal is

IF AMP

In

case

on the fbrmer

controller

MHz

to 29.9999

and

the input

and is

signal

local signal

70.455 MHz. of

70.455

Then the

the 2nd

of 6 kHz,

automatic

(455

of

other than

is supplied

speaker

on the front

is supplied

is not

protecting

for

wave.

This BK

line becomes 0V

the same time,

output does not

for

the

circuit

generator,

and a second

supplied

is

then fed

The

MHz

siganl is supplied

local

The

converted

2

supplied

kHz.).

from

circuit operates

to

AF

and headphones.

stage

to

[BRE-

FAX,

affected by

circuit

since

panel

type double-superheterodyne

MHz

is supplied

protection

to one

into

of 70.545

converted output

and a bandwidth

frequency

kHz

3

r'J

to

the

gain

In case of

the receiving frequency

DSB detection,

AMP and LINE

of

AF

panel.

LINEI

FSK

from

is controlled

(keyed),

the AGC circuit is

appear

composition

power

and

intermediate

to

the RF

circuit.

of the seven filter

the lst

to

signal of

output

and 0.5

AGC circuit

control is

DSB detection,

product

as

a

The

AMP according

The

Mix. in

100.4549 passes

to

the

passes

kHz

and

applied

the BFO

detector.

AMP respectively.

gain

connector

demodulator,

the AF

burning due

the BK circuit

GAIN

to the inducation

by the

controlled,

(muting

of the receiver.

supply

frequency

of l2kHz,

70 MHz

through

and demodulator

is

controller

condition).

sections.

with of

455 kHz.

input filter

signal

MHz

2nd

the filtered

signal

signal supplied

adjusted

on the rear

etc.

external operates for

thus

circuits,

whichthereceiving

through

IF

to the lst

the demodulator

to the DC

depending

and is thereby

the

and

in which

and is thereby

one selected

and operates

AF AMP

by

panel

The LINE

on

the

+BK

and

grounding

gain

the

This

a first

after

supplied

crystal

then is

the

out

signal

IF

circuit

AMP

as

from

for

IC

voltage

is

and

AMP

front

of

own

-BK

of the

5.2 LOCAL SIGANL GENERATOR The

oscillator

local signal

and BFO circuit.

generator

section

SECTION

is composed

-16-

of the lst local

oscillator,2nd

local

5.2.1

lst Local

This

MHz

provides

and

The

variable divider

lOMHz

fraction.

The reference

by

400. variable divider phase

Oscillator

circuit

(

100

circuit consists

to l00kHz

difference.

is single-loop

Hz

step)

that

phase

The

is

output

corresponding

frequency

composed

are

frequency

comparator

to

of

variable

preset

is

and

VCO

synthesizer

to the

lst

mixer.

divider,

of

integer

in the

12.5

integer

kHz

compares

is

controlled

which

receiving

part

obtained

generates

phase

and fraction.

part

the

by the

the

frequency

comparator

and

digits

by dividing

phase

between

DC

,

signal

from

For

voltage

of

90

kHz

and VCO.

frequency

of l0kHz

the standard

this reference

corresponding

70.545

to I 0O.4S4g

to 29

Furthermore

data,

to 100H2

signal

.9999 MHz

the

digits

of

signal

in

the

5 MHz

and

to

that

of

5.2.2

5.2.3 BFO

2nd

Local

Oscillator

This

circuit analogue are in the

between oscillator in PLL, atrd wavetbrm of MHz signal

productdetector.ThefiequencyoftheBFosignalcanbeadjustedbythe@

type

the

is

the

standard

the

signal

and 70 MHz

Circuit

This

circuit operates in

CLARIFIEE

In

case of CW mode,

mode,

SSB

mode

rneans

(option),

456.7 in

This

circuit operates

feeds

the

phase

phase-lock

standard

controlled by

phases

the 5 MHz

every l4

comparator,

loop

are compared

signal

cycles of

siganl

knob.

frequency

the

the frequency

FSK

mode and 45

signal

of standard

are directly

the frequency

as the clarifier

of

70 MHz

70

MHz

(PLL).

the DC

5 MHz.

the waveform

CIV,

456.5

of

The

of

5 MHz

voltage

between

signal

compared.

SSB

kHz

of xxxx

6.9 in

to the 2nd

variable

phase

and

corresponding

5 MHz

But in

or

in

this

(the

pulse

of 70 MHz

AUX

of

455 can be varied kHz

can

FAX

mode.

SSB

and AUX

mixer.

crystal

comparator

70 MHz,

obtained

circuit,

width

signal,

mode,

kHz

can

be

and

be varied

by

varied

modes.

This

circuit is

oscillator

compares

and

to

that

by dividingT0

by

is I

the

provides

more

by more

(VXO)

the 70

phase

comparing

cycle of

12

phases

the

by more

than

and

directly

MHz

variable

difference.

MHz the

70 MHz)

of

5 MHz

BFO

than

+50

Hz,

than

composed

LPF.

phases

the

crystal

Usually

signal

pulse

signal

150

of

and

standard

to

+2kHz,in

and in

Hz.

of

These

by 14

the

70

the

AUX xxxx

PANEL

5.3 The

indicator frequency

set by ttre

Since bandwidth

information is light

up. At

section and BFO

S meter indicates

SECTION panel

section is

circuit, S meter

indicator

rvtHZ

I

the

circuit consists

knob u"o

latched,

same

time, this

selector circuit

the

composed of liequency

and controls.

lTUlVe I

and mode selector and according

output

in the local

voltage

AGC

They

of 6-digit

knob.

to this

controls the

signal

when

-t7-

indicator

are mounted

numerical

switches

latched output,

generator

the

IF

LEDs for

are

filter

circuit,

on one

switch

printed

non-locked LEDs

selector

section.

on the front

mode

the

receiving

for

bandwidth

circuit in

and bandwidth

circuit

type, the

board.

frequency

and mode

the receiving

panel

is

The

switch

set to

and the

S

The MHz frequency. output is provided

circuit so rotation.

generated

are

up/down

full rotation

rumOWNl

this

switch output increased. the receiving

|ÙFDOWNI

The

changed

pulse

switch

line output

set to l0

for

called rotary

Pulse

counter. Therefore, for

to

is connected

By

lLôôKl

by

output

prohibited

are

rumôWNl

The

FjMMEEI

power

the band

width

voltage

indicators).

set to

when

knob

The MHz digit

setting

for

can

fq,

setting this

frequency

switch is

careless misoperation.

from

switch

is

used

information

and I

MHz

receiving

the

encoder

doubler

vary

switch is

circuit makes

one full

up

l0

to

provided

the up/down

to the 100

switch

is

decreased.

set to appro x.

provided

the

fTUtUelknob

to be applied

will not operate.

knob is

applied to

for

MHz digits

turn.

kHz.

provided

LED on

tÏNtrI.

setting

frequency

or

These

the f-ull

for counter Hz digit to I DOWN

When

the l0 MHz

is

pulse

this 50

pulses

turn

fast forward

operates

The frequency

125

kHzlsecond.

for

locking

and

multi-vibrator

to

the

for

the front

and I

sent

out in

of

the up/down

in 100

generator

pulses

are connected

of this knob,

of

the counter, the

l,

the set receiving frequency

this

switch is

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as the up counter.

counter operates

increasing

output

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MHz

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100

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section

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MAINTENANCE

6.

GENERAL

6.1 mounted

Circuits

panel sections.

when of the to damage

The

mountable

This

cover,

It

performing correct

are

section

the special

upper side

handles

is

operating

and VCO

The

special

PC

the

panel

receiver

essential

unit is coupled

ease.

with

attached

proper

the

tools

of the

board

can be

for keeping

condition

on the (CGA-

tools

are not

PC board with

and

taken

to the

maintenance

I

(option)

available,

aluminum

with

to the

right

the

of the

plug-in

2), thus are

part

the chassis through

and

equipment always

and check

equipment,

PC

type

facilitating

available

remove the

the long nose

of the

following

left

sides

ordinarily.

board,

to know

excluding the

repair and replacement

for removing

PC

board

plyers,

frame.

main

pieces;

on

PC

front, front

the

in

the

plug-in

with

etc.

three connectors

board

best

the basic

power

picking At this time, be sure

unit, top cover, bottom

panel

operating condition

operating

supply

PC

type

up the both

and

section,

of defective

board.

main chassis.

principle

But

ends

not

hence de-

and and

GENERAL

6.2

No.

I

2

3

4

5

MAINTENANCE

Table 6.1

Item

Cleaning

Looseness parts

Fuses

Printed circuit

voltage

DC

shows

of

board

the

general

AND CHECK

maintenance and

Table 6.1

For

cleaning

bottom cloth.

or Check

and ICs are and

When ly and l-ampere glass-tube

Remove chassis discolor parts. an

Check means

+5V.

cover,

For the inside

cleaner.

whether

volumes

inserted

attach

fuses for the

replace them.

glass-tube

the

and

or are

When replacing

for

order

the of

Maintenance

the

wipe

Since

screws

are

them surely.

fuse for DC

plug-in

check whether

burnt or

parts

DC voltage of

the tester.

and

Maintenance

panel

surface,

off

of the set,

gear

no

and

loosened,

into sockets

power

fuse

power (included

type

the

the sales

to

The

check

the stain

using

Check

and check

knobs,

with

remove

is equipped,

are

nuts

connectors

surely,

supply

used

is

printed

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not.

part

the

standard

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for AC

circuit

parts

When

excluded

agent

POWER

and some

tester

switches,

cloth

a soft

the dust with

lubrication

loosened,

loosened

are

Fasten

not.

or

check

power

in the spare

board

mounted

replacing

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in

or service

(CBD-351)

unit

values are

tools.

cover

top

or

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knobs,

relays and

them

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and

parts

from the

the

on

parts,

use

spare

station

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+15V

and

silicon

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required.

switches

firmly

careful-

set)

main

PC

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spare

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of

by

give

JRC.

and

parts,

-19-

6.3 TROUBLESHOOTING Troubles

are due receiver. trouble trouble shooting befbre methods fbr

6.3.1

Decline

The sensitivity means output

Explanation

For

performance

output

AF

For RF GAIN the sound loudly has very

volume Even the distance from varies largely sensitivity under compared, sound volume

may happen

to the receiver

'Ihus,

is

word

signal of the receiver

in case of the

the

even

due to the receiver

due

to the receiver

contacting

typical

of

some constant high

stage

example,

set to 8

bad

and AF

of the receivers,

and receive

troubles

the

sensitivity

"Sensitivity"

not only

of the receiver.

of

graduation

with

sensitivity."

GAIN

depending on

following

to the almost

sometimes

itself,

if

the receiver

receiver.

the

"the

former

the

volume

same model receivers,

partner

the

condition:

the

while

but

some of

is under

without

itself or

JRC

with

are

described

is used

that the

reduces.

frequency

This

and AF GAIN

same

This

doesn't

ttre

S/N of

same frequency

same level.

checking

due

or JRC's

ambiguously

sound

depends

receiver

gain

settings,

for

the

station

year,

season,

the receiver

Connect

using

them

a trouble

the

to

below.

volume

input

only

could

make

setting

there

and

the same

a receiver

may

be caused

conclition,

the cause

external

sales

agent or

among

is not

signal,

to

2. But

sense

frequency

time, etc.

at the

the

on the

produce

unlike

at

all. The effectiveness

graduation

are

some differences.

must

same time,

for

long

a

by reasons

yourself.

by

problems

service

users.

In

this

large

but

sound

gain

the

present

the

are the

Thus, in

be compared

antennas

does

from

sound

former

is different

same, the

to the receivers

p.rioO.

do not

according

receiver

receiver.

order

by

conclude

Check

station.

section,

also

not

depend

the input

loudly

among makers.

Also, even

wave

to compare

between

setting the

Some

other

to the The

that

stage to

enough

can't

This of RF GAIN

than

that the

whether

trouble-

inspecting

the

decline

S/N

on

produce

receiver

though

strength

receivers

to

speaker

troubles

with

the

of

of the

the the

the

be

Checking

(

1) Check whether the receiver

(2)

procedure

or not. Receive in the

special band,

remarkable

is same antenna, it diff'erence

depends on variation When the the antentra system. When between the antenna sensitivity is still bad, connect improved multi-coupler

when connecting

the radio

receive

between

can conclude that

is not remarkable, that

sensitivity

and

antenna changer

wave in other

receivers

receivers.

in

reduces

and

is

misoperated

that radio

even an antenna

receiver,

another antenna

the antenna

wave by

when receiving

the

is not

if the frequency

connect the

successively.

-

20-

or

not.

frequency

other receiver,

the

trouble

the

trouble

multi-coupler

antenna

to the receiver.

directly to

Check

band. When

same

is

due to the receiver

of the receiver

band is

the receiver,

whether ATT

the

sensitivity

possible.

if

signal in

itself. This

changed,

or

antenna changer

directly to

If

the

check

is

to ON,

set is very

If

the

difference

the

same time

itself. If

difference

start the check from

is inserted

the receiver.

sensitivity is

the

cable, antenna

bad

by the

that

If

the

greatly

(3)

When

RF input filter

it is

conflnned that

circuit CFL-184

the receiver

andlor

itself

is bad, replace

RF

AMP

CAF-I9I.

the BK

relay

of

the receiver,

6.3.2 No

6.3.3

the speaker. But that

in the cases, the receiver surrounding you not.

sound

The sound

receiver

the receiver.

Checking (

I

)

(2)

Noise and beat

In

procedure

Rernove If

the sound colnes out

Check

parallel.

in Lock-out check Take

out the receiver turning on of the receiver. out. But the following frequency,

Even though changing the receiving

Especially,

small

must check

does not

correctly,

such a case,

the

E!!&TE

wirings of otherreceivers,

the

LED light until the

in case of

room,

for

the source

whether the new equipment

come through

and no defects

check the receiver

connector from

through

of the

power.

If LED

so

suffers intert-erence.

synthesizer

liom

the

LEDs

noise is evidently

small ship,

that

the

can be visually

are off,

case is

synthesizer

mutual

of

noise. Especially,

the

speaker

have

been

found

in the following

the receiver.

the

speaker,

transmitters

cabinet

it

is correct. But

not

abnormal condition:

frequency

not external

many

interference

When

-tsK

and

case or rack,

checked

is locked.

kinds

of

the mutual

when

gives

even

though

in the

grounded

is

consoles

and check

through

if

LED light,

band,

noise or

noise.

electronic equipments

may happen

mounting

the noise

the

speaker

procedures.

somewhere

to

which

LEDs from

the hole

the

After

beat

among

interference

a new electronic

interference

and indications

changing

is connected

in the

-BK

line

is

connected

the

on

the top

synthesizer

the receiver

sound comes

are concentrated

equipments.

arises,

to the receiver

search

equipment,

to

of the

BK

line.

top after

cover

is locked

through

In many

the

or

Checking (

I ) Investigation of the

(2)

procedure

first,

At

speaker. the noise equipment is the source the high

power

Investigation of the After routes

set the

Turn ofT the

when turning off the

stops

frequetrcy noise,

supply line.

checking the noise source, the

largely

are

source of noise

receiver

classified as

to

power

of

route of

the noise.

not the

noise

such a condition

of the equipments

power

Sometimes,

electronic

route

shown in the figure.

where the

of some equipment,

erluipment.

of the noise must

*2t-

noise

other than

power

the

In

comes out

the receiver

it

is considered

supply

such a case, use

be investigated.

successively. If

itself may

through

that the

generate

the

other

The

noise

the

Y

i t-"^--'^----.-

goes

noise

The

By removing

power

(3)

Countermeasure

supply line

Basically, equipments

to the antenna

goes

noise

The via

the

the antenna,

and moving

power

to the

cable.

connecting

the installation

the countermeasure must

must be

grounded.

If

Noise

the receiver to

be

the equipment is wide copper board, the noise interference may suppresses noise the maker

the HF noise is very effective

source and noise

route,

please

or sales agent of that

examine

equipment

l^*'*l

to the receiver

In

side.

wire. After

any means of

by line filter which

source

taken

at

F...;l

noise

The

other

place,

at the noise

the

route can be found.

the

surely

resolved. Also, a

be

power

goes

directly

antenna, using the

source

grounded

supply

the trouble and ask the countermeasure to

which is of the noise

source.

other

cases,

finding

all

the

O

6.3.4

Interference

the transmitter of

by

At the station where

transmits the radio different. But when

It

is a

performing

communication,

possible.

far

as

wave,

rule

is important to

it

Even antenna, the receiving antenna interference.

Generally, and transmitting the degree of the

protective

the interference

frequency. The

interference

diode,

etc.

your

station

many radio equipments are installed,

receiver

the

that

the

simultaneous

though

the receiver is muted

the antennas

depends on the

may catch the noise in

transmission and reception

separate

located

transmitting located

are

not in

parallel

difference between the

by

at same

bigger the difference

depends on the

-

performance

.,.\

-

z-z-

when some

that the frequency

of

spite

-BK

using

antenna

to the

signal

distance

transmitting

while transmitting.

because

receiving

and

from

of the duplex

the

antenna

receiving

the less the interference is.

is,

of

the

antenna

multi-coupler,

transmitter

is

antenna as

transmitting

has less

frequency

Also,

Checking

procedure

6.3.5

(

I

Connect

)

Change from

(2)

When

(3)

When

so When no countermeasure is effective. combination of nience, and avoid

receiver itself

not

sion and reception

small

Intermodulation

While

cannot

the receiving antenna to other antenna

the transmitting antenna

the antenna

the

as to increase

the interference

be avoided

ship,

receiving

radiated by

be

antenna

other

multi-coupler

arrester-diode

the

number of

transmitting frequency

the

such a combination of

is designed so

that

the some extent of interference occllrs in

when antenna installation

etc.

some

that frequency.

does not disappear even

frequency, it sometimes

which

used, connect the antenna directly to the receiver.

is

is mounted

the

diodes.

Thus,

as

amplify

to

This

placed

interferes

the antenna

in

leave the record

phenomenon

the

(See paragraph

after

and receiving

frequencies with the

enough even a signal

places

happen to

at the

receiver.

system,

checking

cannot be separated enough

caused by intermodulation.

is

position

add the

6.3.5.) with

for the

frequency for future conve-

hear

same

the above

degree of interference,

strong

of I

the

simultaneous

such several

far

as

diodes

procedures,

interference. The

pV,

so

that

possible

as

in series

it can

transmis-

in

signal

the

as

Checking (1)

(2)

procedure

When the antenna

antenna directly

If arises at the When the

antenna

or not.

do not operate the

If the

or

above

the

phenomenon

directly,

If

inserted,

phenomenon

replace

them

multi-coupler is the receiver.

to

phenomenon

antenna

multi-coupler.

check whether arrester-diode

remove that arrester-diode and

transmitter).

disappears by

with other type

disappears, it

does not

connected to the

disappear

removing the arrester-diode,

protecting

can

be

though the

even

is inserted on

element.

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receive the

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the

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add arrester-diodes

this time,

the

line,

more

(3)

When antenna directly and the arrester-diodes are removed, of the receiver.

input

phenomenon

the

filter

circuit

does

first, remove

At

(CFL-I84).

not

disappear

the arrester-diodes CD22 to

When the

-23

even

phenomenon

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though the

is

this

does

receiver

caused by

CD27

disappear

not

is connected

the

characteristics

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still

to the

now,

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Explanation Intermodulation

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fu,

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JRC NRD 91 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual