Ramsey Electronics DDF1 User Manual

DOPPLER DIRECTION
FINDER
RADIO DIRECTION FINDER
KIT
Ramsey Electronics Model No. DDF1
Get in on the fun of radio direction finding (RDF) with this super
kit ! The latest in affordable Doppler direction finding equipment
available in a complete kit form ..this one even includes the
receiving antenna. A must for the “fox hunter” at an unheard of
price!
• Elegant and cost effective design thanks to WA2EBY ! Featured in
May / June 1999 QST Articles.
• Solid state antenna switching for “rock solid” performance.
• Convenient LED 22.5 degree bearing indicator.
• Audio Level indicator for trouble free operation.
• Adjustable damping rate, phase inversion, scan enable / disable.
• Complete with home brew “mag mount” antennas and cable,
designed for quick set up and operation.
• Utilizes latest high speed CMOS technology for signal conditioning
and audio processing!
• Complete and informative instructions guide you to a kit that works
the first time, every time - enhances resale value, too !

Ramsey Electronics DDF1 Specifications

General

Brand	Ramsey Electronics
Model	DDF1
Category	Camera Accessories
Language	English

Summary

Understanding the Doppler Direction Finder

Introduction and Doppler Effect Theory

Introduces the DDF1 kit and explains the fundamental Doppler effect principle.

DDF1 Circuit Operation and Functionality

Explains the circuit's core functions, clock oscillator, multiplexers, and signal processing.

Indicators, Filtering, and Power Supply

Details the digital filter, audio processing, status indicators, phase correction, and power supply.

DDF1 Kit Components and Assembly Guide

Parts List and Component Identification

Comprehensive list of all resistors, semiconductors, and miscellaneous parts required for the kit.

General Soldering and Assembly Best Practices

Essential advice on soldering techniques and the kit building philosophy.

Main Circuit Board Assembly Steps

Step-by-step instructions for installing components onto the primary circuit board.

Antenna System and Coaxial Cable Assembly

Guides assembly of antenna interface, mounting boards, and coaxial cable preparation.

Testing, Operation, and Finalization

Initial Electrical Testing Procedures

Guides checks for shorts, power application, and voltage verification before full operation.

Functional Testing of Indicators and Controls

Tests signal levels, direction indicators, and calibration controls using a signal generator.

Final Calibration and Unit Casing

Covers in-car calibration and securing the completed unit in its enclosure.

Troubleshooting and Conclusion

Provides guidance for resolving common issues and offers final remarks.

Ramsey Kit Warranty and Support

Defective Parts, Missing Parts, and Returns Policy

Outlines policies for handling component issues, missing parts, and kit returns.

Factory Repair Services and Policies

Details the process for submitting kits for factory repair and warranty service.