Booth No. EH0650

Radio Direction Finder

DF2020T (Kit)

DF2020T Radio Direction Finder kit requires minimum assembly for 10~15 Minutes

The Stealth DDF2020T/GPS is an economical but very sophisticated Doppler Direction Finder with GPS and can connect a PC or Laptop, to position and draw plots on GoogleEarth^TM display window accompanied with “Navi 2020” plotting program.

** Required only minimum assembling for 10~15 minutes with the tested components in the case

The receiver and antennas are not included

FUNCTIONS

Multi Display – Numeric & 36 LED pelorus display
Compatible with APRS software
Can use with “Navi2020” map plotting display program (with the optional GPS Receiver)
Uses GoogleEarth^TM viewer for displaying map of ploiting.
Automatic or manual operation
Accepts standard $GPRMC NMEA GPS message
Archive Navi files are auto-saved

SPECIFICATIONS

Microcomputer / DSP Doppler DF
DF Antenna Module with built-in magnetics on the bottoms for easy install
GPS input for "moving map" Windows display
RS232 output for PCs (can use with Serial to USB conveter)
Uses Any Type of FM Receiver and Scanner, Wideband Antenna design
12 - 28 VDC operation
Pre-assembled External Antenna Unit for Plug and Play
4 antenna elements and new circuit design for improving the sensitivity and accuracy
Suitable from 100 to 1000 Mhz and beyond
Useful from 88 to 100 MHz with reduced sensitivity

MAJOR FEATURES

VHF/UHF Doppler type DF, (4 antennas) primarily for mobile DF operation, 100 to 1000 MHz
The user must provide additional equipment (PC or laptop) to use the DDF2020T DF System:
A VHF/UHF FM receiver is required. (For receiving a signal for DF)
Pre-assembled antena unit for Plug and Play

Comes With DDF2020T, Antenna Unit, GPS Receiver(option), Navi2020 Program(Option), 3.5mm Audio Cable Set, Antenna Control Cable(4.3 m), RG174 Cable(14.5 m), Bracket, Cigar Cord. - Not Include Receiver and antennas
The appearance of product may be different from the picture

Cotents in the Package

Case with assembled parts - requires a minimum assembly
The Antenna Module with magnetics on the bottoms
Cigar Jack Power Cord
Screw pack
3.5 mm Audio Cable Set
RG-174 cable
Antenna Control Cable
Bracket

· Receiver Frequency: Determined by user-provided FM

receiver, range 100 to 1000 MHz

· Antenna : Four elements, wave vertical with ground plane (recommended)

· Ant Scan : Scan rate 430 Hz, rotation clockwise (viewed from above antenna)

· Ant Switch : Modified Joe Moell Wideband Doppler DF antenna design

· Employs Agilent HSMP3893 SMT PIN diodes

· SMT / stripline circuit design, BNC output connector

· Audio Input : FM receiver speaker audio, 1.0 K ohm

load. 25 db dynamic range.

· GPS Input : 4800 baud RS232 input, NMEA $GPRMC,

$GPGGA and / or $GPVTG messages.

· Output : RS232 Agrello DF message, 4800 baud, 8N2.

(15 messages / second)

· Ant Outputs : Four discrete active HIGH outputs for

DDF2020T Antenna (one per antenna) and 1 auxiliary antenna for improving it sesitivity and accuracy.

· Voice Filter: Switched-capacitor filter, (SCF) 4

sections. Bandwidth 0.2 Hz

DDF2020T Connection Diagram

When you use RS232(Serial) To USB Convertor, please install the right driver comes with it.
Antenna N should be placed in frontward of vehicle to indicate 0 degree of DF.Display.
When DDF2020 tunes with the right RF signal, it outputs clear 430 Hz audio signal which will indicates stable LED.

Navi 2020

Positioning and Map plotting program on Google earth^TM with GPS data

The Navi2020 "map plotting" program accepts DDF2020 DF + GPS messages and plots them on a Google Earth display window. Manual latitude / longitude and DF bearing inputs allow operation without a DDF2020 DF. Up to 100 plot points allowed, and hunt results are saved in archive files.

Google Earth normally works with an open internet link, but areas previously viewed are archived and available for offline viewing. This makes Navi2020 suitable for use in real time mobile hunts, when an internet link is not available.