Ramsey Electronics LEDS1 Manual de Instruções Página 1

DDF1  1 DOPPLER DIRECTION FINDER RADIO DIRECTION FINDER KIT Ramsey Electronics Model No. DDF1 Get in on the fun of radio direction finding (RDF)

DDF1  10 with amplitude above 0.11 V peak and C9 recharges via R23. The LED dis-play remains locked by disabling U11's strobe input whenever th

DDF1  11 DDF1 PARTS LIST Sort and “check off” the components in the boxes provided. It’s also helpful to sort the parts into separate containers (e

DDF1  12 SEMICONDUCTORS AND INTEGRATED CIRCUITS 11 1N4148 small signal diode (small glass case with banded end) [DDF1 board D1,2,5 ANTINT-1 board

DDF1  13 1 Main PC board (DDF-1) 1 Antenna switch board (ANTINT-1) 4 Antenna boards (ANTMTG-1) REQUIRED ITEMS (But Not Supplied) 1 Length

DDF1  14 DDF1 DOPPLER DIRECTION FINDER ASSEMBLY STEPS IMPORTANT!! Although we know that you are anxious to complete the assembly of your di-recti

DDF1  15 6. Install R37, 10K ohm. 7. Install R27, 10K ohm.  Locate nineteen(19) 33K resistors [orange-orange-orange] 8. Install R5, 33K ohm.

DDF1  16  Locate two(2) 47 ohm resistors [yellow-violet-black] 34. Install R51, 47 ohm. 35. Install R42, 47 ohm.  Locate two(2) 330 ohm resi

DDF1  17 DDF-1 MAIN BOARD PARTS LAYOUT DIAGRAM

DDF1  20  Locate the two(2) 555 time IC’s 52. Install U6, 555 timer IC. 53. Install U4, 555 timer IC.  Locate the 74HC4051 IC 54. Install

DDF1  21 68. Install C2, .01uF capacitor. 69. Install C3, .01uF capacitor. 70. Install C1, .01uF capacitor. 71. Install C18, .01uF capacitor

DDF1  2 PARTIAL LIST OF AVAILABLE KITS: RAMSEY TRANSMITTER KITS · FM10A, FM25B, FM30, FM Stereo Transmitters · FM100B, FM35 Professional FM

DDF1  22  Locate two(2) 100uF capacitors [100uF] 90. Install C30, 100uF electrolytic capacitor. 91. Install C29, 100uF. electrolytic capacitor

DDF1  23 CONTROL AND DIRECTION INDICATOR ASSEMBLY In these assembly steps for the DDF1 main board, the components will be mounted to the SOLDER SIDE

DDF1  24 105. Temporarily fit the circuit board into the case top, and carefully tip the board and case over and allow the LED’s to fall into thei

DDF1  25 DDF-1 ANTENNA SCHEMATIC DIAGRAM

DDF1  26 ANTMTG BOARD LAYOUT ANTINT BOARD LAYOUT

DDF1  27 ANTENNA SYSTEM ASSEMBLY Roll those sleeves back up; we’ll get to the antenna switcher and individual antenna assemblies to complete the Dop

DDF1  28 COAXIAL CABLE PREPARATION AND ASSEMBLY We’re getting very close to the end now! It is time to install the coaxial “jumpers” that connect th

DDF1  29 Locate the 4 antennas, 5 plastic caps, 4 lock washers, 4 M3 kepnuts, 4 M3 screws 4 antenna boards and 1 antenna switch board.. Refer to th

DDF1  30 labeled “ANT1” on the ANTINT board. 5. In the same way connect the wires connected to the DB9 connector pins 2, 3, and 4 to the “ANT2”,

DDF1  31 TESTING Basic Testing It is wise to review your workmanship, looking for circuit shorts or opens prior to applying power. Use an ohmmeter t

DDF1  3 Ramsey Publication No. MDDF1 Price $5.00 TABLE OF CONTENTS Introduction to the DDF1 ... 4 Theor

DDF1  32 Direction Indicator Adjust the frequency of the audio generator very slowly around 500 Hz while observing the LED display. You should see

DDF1  33 and should be positioned to the right of antenna 1 as viewed from the center of the antennas for a clockwise spin. Close and open S2 until

DDF1  34 Operation Checking performance of the RDF unit is best done in a large, empty area away from tall buildings: a parking lot will do. Use c

DDF1  35 Final Calibration A more accurate calibration can be achieved while the car is in motion. Posi-tion a volunteer with a transmitter in a sa

DDF1  36 FINAL CASE UP OK… Now that you’ve completed testing and setting up your DDF1 it’s time to make it look pretty. This is the final phase of

DDF1  37 CONCLUSION We sincerely hope that you enjoy the use of this Ramsey product. As always, we have tried to compose our manual in the easiest,

DDF1  38 NOTES ___________________________________________________________________________________________________________________________________

DDF1  39 THE RAMSEY KIT WARRANTY 1. GENERAL: Notice that this is not a "fine print" warranty. We want you to understand your rights and

DDF1  40 ABREVIATED TABLE OF CONTENTS Introduction to the DDF1 ... 4 Theory Of Operation ... 4 Parts Li

DDF1  4 INTRODUCTION Radio direction finding is a fascinating hobby that has been becoming more and more popular in today's portable world. Mo

DDF1  5 c = Speed of light We can calculate how fast the antenna must rotate in order to produce a given Doppler frequency shift with the following

DDF1  6 The frequency of rotation is: fr = 500 x 1879.8/146 x 13.39 A rotation frequency of 480 Hz translates to 480 x 60 = 28,800 or almost 30,000

DDF1  7 latches the direction indicating LED. The adjustable delay is used to calibrate the LED direction indicator with the actual direction of the

DDF1  8 Three Synchronized Functions The first function derived from binary counter U7 is antenna array spinning. This is accomplished by using the

DDF1  9 the digital filter. Even if the clock oscillator frequency drifts, the Doppler tone drifts accordingly, but the center frequency of the dig