PAGE
CHAPTER 1
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
TABLE OF CONTENTS
DX 98VHP
CHAPTER 2
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
BIG RIG SERIES
20
9
+
7
40
5
+
3
S
1
0
50
25
PO
0
1.5
SWR
1
dB
60
+
100
150
200
MAX
3
2
SET
D E
F
C
B
A
USB
G
H
AM
LSB PWR
MIC RF
TALKBACK
OFF
SWR
RB OFF OFF
NB/ANL
DIM PWRVOL SQ
ECHO
F.D.
OFF
VC OFF
FINE COARSEECHO TIME
+10KHz
PA
DX 98VHP
OFF
OFF
10 Meter
Installing The Radio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Ignition Noise Interference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Antenna . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
External Speaker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Public Address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
CHAPTER 3
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Rear Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Procedure to Receive and Transmit . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Amateur Mobile Transceiver
Receiving SSB Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Alternate Microphone and Installation . . . . . . . . . . . . . . . . . . . . . . . . . . 12
With Built-in Frequency Counter &
StarLite Face Plate
OWNER’S MANUAL
1
USB/LSB:
AM:
GENERAL
Model DX 98VHP
Frequency Range 28.315 ~ 28.755 MHz
Emission AM/USB/LSB
Frequency Control Phase-Lock-Loop (PLL) Synthesizer
Frequency Stability 0.001%
Temperature Range
Antenna Impedance 50 Ohms
Antenna Connectors Standard SO-239 type
Input Voltage 13.8V DC
Size
Weight
TRANSMITTER
Current Drain AM: 25 Amps SSB: 40 Amps
Spurious Emission -50 dB
Unwanted Sideband -50 dB
Audio Distortion 10%
Frequency Response 300 to 2500Hz
Microphone Dynamic
Clarifier Range
RECEIVER
Sensitivity for 10 dB (S+N)/N
Squelch Sensitivity < 0.5 uV
Selectivity -55 dB
Image Rejection -50 dB
AGC Figure of Merit 100 mV for 10dB Change in Audio Output
Audio Power Output 2.5W @ 10% Distortion
Audio Response 300 to 2500 Hz
(SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE)
CHAPTER 1 SPECIFICATIONS
-30°C to +50°C
7 7/8" (W) x 3 1/8" (H) x 10 3/4" (D)
10 lbs.
AM: 10W~50W RF Power Output
200W PEP
Coarse: ± 6.0KHz, Fine: ± 1.0KHz
< 0.5 ìV; USB/LSB: < 0.25 ìV
CHAPTER 2 INSTALLATION
INSTALLING THE RADIO
Choose a convenient location for operation that does not interfere with driver or
passenger. This radio is supplied with a universal mounting bracket. When mounting
the bracket and radio to your car, make sure it is mechanically strong. Also, provide a
good electrical grounding connection to the chassis of vehicle. Proceed as follows to
install the radio.
1. Locate a convenient area in your vehicle for the installation of the radio. Hold the
mounting bracket with 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 radio antennas come equipped with a PL-259 plug. Connect this plug to the
ANT. Jack in the rear of the radio.
3. Extending from the rear of the radio is a fused red and black wire for the DC
connections to the vehicle’s electrical system. For best performance, it is strongly
recommended that the Red lead be connected directly to the positive terminal on
the vehicle’s battery and the black lead be connected directly to the negative
terminal on the battery. (Note, not connecting both leads direct to the battery may
cause performance problems) This radio is designed for vehicles with negative
ground systems.)
Connections should be made using appropriate “crimp on” lugs of a size large
enough to make good contact with the bolt used to fasten to the. It is a good safety
idea to install a second 50 amp fuse that would provide protection in case the red
wire was to “fray” or get pinched and short to the body of the vehicle, somewhere
between the battery and the radio.
High power radios such as this one require large DC current flow when in the TX
mode. Poor power connections cause supply voltage drops that can substantially
decrease the performance of your radio. A good DC connection is probably one of
the most important things for getting the best transmitter performance and in some
cases, least receiver noise.
4. Mount the microphone bracket near the radio in an easily accessible spot using the
two screws provided.
2
3
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, quarterwave 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.
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.
14 15 16 17 18 19 20 2321 22
BIG RIG SERIES
20
9
+
7
40
5
+
3
S
1
0
50
25
PO
0
2
1.5
SWR
1
DX 98VHP
dB
60
+
100
150
200
MAX
3
SET
D E
C
B
A
AM
USB
OFF
F
G
H
LSB PWR
OFF
MIC RF
SWR
TALKBACK
RB OFF OFF
DIM PWRVOL SQ
OFF
NB/ANL
ECHO
F.D.
OFF
2 31 4 5 6 7 121098 11
VC OFF
FINE COARSEECHO TIME
+10KHz
PA
13
4
5
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