Nissei DG-503 User Manual

INTRODUCTION
This SWR & Watt meter is highly accurate for measuring Forward Power,
Reflected Power, and the VSWR of Analog and Digital transceivers
Main Features:
1. Large LCD (3.5") display for easy of reading
2. Forward / Reflected power / VSWR ratio in one push button
3. Selectable to measure DMR (TDMA), AM, SSB (DG-503MAX)
4. LCD backlight display
5. Convenient control layout for easy operation
6. Packing gift box and DC 12V wire
SPECIFICATIONS
MODEL DG-503 DG-503MAX
Frequency Range
Measurement (Analog
mode)
Measurement (MAX mode) Not available DMR (TDMA), AM, SSB
Calibration point
Power Range
Accuracy
Minimum Power for SWR
Input/Output Connector
Weight (Net)
Insertion Loss
Testing Function
Input/Output Impedance
Dimension (W/H/D) mm
Accessories
<FRONT PANEL>
1 4 2
<FRONT & REAR PANEL>
1. LCD Display : Indicates FWD/REF and VSWR
2. HF & V/UHF band switch
3. Power switch
3
4. MAX : Measuring DMR (TDMA) / AM / SSB
(DG-503MAX only : when rear switch in MAX mode)
<REAR PANEL>
<REAR PANEL>
5&8.TX : Coax connector to transmitter RF output
6&9. ANT : Coax connector to antenna system
7. Power source :12V DC wire
[ Black is negative (-), black/white is positive (+) ]
10. MAX switch : Selectable DMR (TDMA), AM, SSB
(Push to right 'black dot' - DG-503MAX only)
Made in Taiwan
50 Ohm
140 x 84 x 122
Operation Manual, 12V DC Wire
(+/- 5%)
1W
SO239 (N-female option)
750 g
Less than 0.1 dB
Fwd/Ref Power & VSWR ratio
0 - 200W
Digital SWR / Watt Meter
Model: DG-503 & DG-503MAX Instruction manual
1.6-60 MHz/125-525 MHz
CW, FM, FDMA
28 / 145 / 435 MHz

Nissei DG-503 Specifications

General

Frequency Range	1.8-525MHz
Accuracy	±5%
Impedance	50Ω
Connectors	SO-239
Weight	540g

Summary

Introduction to the SWR Watt Meter

Front and Rear Panel Controls

LCD Display Functionality

Indicates FWD/REF and VSWR readings for user reference.

Band Switching

Allows selection between HF and V/UHF frequency bands.

Power Switch Operation

Controls the power on/off state of the device.

Max Mode Measurement

Enables DMR (TDMA)/AM/SSB measurement when rear switch is engaged.

TX Connector

Coaxial connector for connecting to the transmitter's RF output.

Antenna Connector

Coaxial connector for linking to the antenna system.

Power Source Input

Connects to a 12V DC wire for device power.

Mode Selection Switch

Allows selection of DMR (TDMA), AM, SSB modes.