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4

IGNITION NOISE INTERFERENCE 

With weak signals, you may experience interference of the signal by background 

noise. This radio has NB and ANL circuits that will help reduce background noise from 
sources such as your ignition system. However, background electrical noise may come 
from several sources and all noise may not be eliminated. With extremely weak signals, 
you can operate this radio with the engine turned off, which should improve reception. 
If the ignition noise level is too high to allow proper operation under most conditions, 
you should have your installation of the radio checked by a qualified technician. 

 

ANTENNA 

This radio has a jack in the rear for a standard PL-259 antenna plug. If you are 

looking for the most range for your transmission, use a vertically polarized, quarter-
wave length antenna. If antenna height is a problem, you may use a shorter, loaded-type 
whip antenna although you can expect some loss of transmission range. 

To improve performance, your antenna should be matched to your radio. Your 

antenna can be adjusted so that it matches your radio. 

    

EXTERNAL SPEAKER 

The external speaker jack (EXT SP.) on the rear panel is used for remote receiver 

monitoring. The external speaker should have 8 ohms impedance and be able to handle 
at least 4 watts. When the external speaker is plugged in, the internal speaker is 
disconnected. 
 

PUBLIC ADDRESS 

To use the Public Address (PA) function, first connect an external speaker to the PA. 

SP. Jack on the rear of the radio. See the above specifications for a proper external 
speaker. Keep the speaker away from the microphone to avoid acoustic feedback. 
 

 

 

5

F

D

E

C

D IM       PW R

VO L       SQ

O FF

MIC       RF

O FF

T A L K BA C K

FIN E       C O A RSE

EC H O               T IME

B

A

G

H

U SB

A M

LSB PW R

SW R

RB O FF

O FF

EC H O

V C O FF

+10KHz

O FF

SWR

1

1.5

3

2

S

1

0

5

3

9

7

SET

   40

+   

   20

+   

   60

dB

+   

MAX

200

150

100

50

25

PO

0

PA

B IG   R IG   S E R IE S

DX 9 8 V HP

F.D .
O FF

N B/A N L

2

3

1

4 5 6 7

12

10

9

8

11

14

15 16 17 18 19 20

23

21

22

13

 

CHAPTER 3 OPERATION

 

 

CONTROL FUNCTIONS 
FRONT PANEL 
 
 
 
 

 
 
 
 
 
 
 
 
 
 
 
 
 

1.  MICROPHONE JACK:

 Used to connect microphone. 

 

2.  MOD LAMP: 

This

 

Modulation indicator will illuminate as you speak into the 

microphone. When you speak louder, it appears bright because it is on nearly 100 
percent of the time and when you speak softer, it appears dimmer because it is 
flickering on and off. It does not glow at all when there is no modulation. This lamp 
operates in all modes. 

 

3.  MODE SWITCH: 

This control allows you to select one of the following operating 

modes: AM/USB/LSB. 

 

4.  ON/OFF VOLUME:

 This knob controls the volume and power to the radio. To 

turn radio on, rotate the knob clockwise. Turning the knob further will increase the 
volume of the receiver. 

Summary of Contents for DX 98VHP

Page 1: ...z O FF SWR 1 1 5 3 2 S 1 0 5 3 9 7 SET 40 20 60 dB MAX 200 150 100 50 25 PO 0 PA B IG R IG S E R IE S DX 9 8 V HP F D O FF N B A N L 1 TABLE OF CONTENTS PAGE CHAPTER 1 Specifications 2 CHAPTER 2 Insta...

Page 2: ...th the radio in the location where the radio is to be installed Make sure nothing will interfere with either the radio or the mounting bolts Mark and then drill holes for the mounting bracket 2 Most r...

Page 3: ...e and be able to handle at least 4 watts When the external speaker is plugged in the internal speaker is disconnected PUBLIC ADDRESS To use the Public Address PA function first connect an external spe...

Page 4: ...ue Therefore it is ideal for switch and control recognition day or night 16 BAND SELECTOR This switch is used to select the band 7 17 PWR SWR RB SWITCH When in the RB position the radio transmits an a...

Page 5: ...th and speak clearly in a normal voice This transceiver comes complete with a low impedance dynamic microphone B PROCEDURE TO RECEIVE 1 Be sure that power source microphone and antenna are connected t...

Page 6: ...eased whereas in the LSB mode the transmitter s output frequency is decreased The result in listening to the receiver is that when the MODE switch is in the proper position either USB or LSB a true re...

Page 7: ...be used is provided with pre cut leads they must be revised as follows 1 Cut leads so that they extend 7 16 beyond the plastic insulating jacket of the microphone cable 2 All leads should be cut to th...

Page 8: ...he connections to pin 1 and 3 are made first and then the connections to pins 2 and 4 Use a minimum amount of soldering and be careful to prevent excessive solder accumulation on pins which could caus...

Page 9: ...16 MEMO 17 MEMO...

Page 10: ...n of the symptoms This is important because it will help the technician who works on your radio to locate your problem Intermittent problems are easily overlooked so be sure to give as much detail as...

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