Ramsey Electronics DDF1 Скачать руководство пользователя страница 35

DDF1 

 35  

The Ramsey Kit Warranty 

 

Please read carefully BEFORE calling or writing in about your kit. Most 
problems can be solved without contacting the factory.

 

 

Notice that this is not a "fine print" warranty. We want you to understand your rights and ours too! All 
Ramsey kits will work if assembled properly. The very fact that your kit includes this new manual is 
your assurance that a team of knowledgeable people have field-tested several "copies" of this kit 
straight from the Ramsey Inventory. If you need help, please read through your manual carefully, all 
information required to properly build and test your kit is contained within the pages!   
 

1. DEFECTIVE PARTS:

 It's always easy to blame a part for a problem in your kit, Before you conclude 

that a part may be bad, thoroughly check your work. Today's semiconductors and passive components 
have reached incred bly high reliability levels, and its sad to say that our human construction skills 
have not! But on rare occasion a sour component can slip through. All our kit parts carry the Ramsey 
Electronics Warranty that they are free from  defects for a full ninety (90) days from the date of 
purchase. Defective parts will be replaced promptly at our expense. If you suspect any part to be 
defective, please mail it to our factory for testing and replacement. Please  send only the defective 
parts), not the entire kit. The parts) MUST be returned to us in suitable condition for testing. Please be 
aware that testing can usually determine if the part was truly defective or damaged by assembly or 
usage. Don't be afraid of telling us that you 'blew-it', we're all human and in most cases, replacement 
parts are very reasonably priced.   
 

2. MISSING PARTS:

 Before assuming a part value is incorrect, check the parts listing carefully to see 

if it is a critical value such as a specific coil or IC, or whether a RANGE of values is suitable (such as 
"100 to 500 uF"). Often times, common sense will solve a mysterious missing part problem. If you're 
missing five 10K ohm resistors and received five extra 1K resistors, you can pretty much be assured 
that the '1K ohm' resistors are actually the 'missing' 10 K parts ("Hum-m-m, I guess the 'red' band 
really does look orange!")  Ramsey Electronics project kits are packed with pride in the USA. If you 
believe we packed an incorrect part or omitted a part clearly indicated in your assembly manual as 
supplied with the basic kit by Ramsey, please write or call us with information on the part you need 
and proof of kit purchase. 
 

3. FACTORY REPAIR OF ASSEMBLED KITS:

  

To qualify for Ramsey Electronics factory repair, kits MUST:     
1. NOT be assembled with acid core solder or flux. 
2. NOT be modified in any manner. 
3. BE returned in fully-assembled form, not partially assembled. 
4. BE accompanied by the proper repair fee. No repair will be undertaken until we have received the 
MINIMUM repair fee (1/2 hour labor) of $25.00, or authorization to charge it to your credit card 
account. 
5. INCLUDE a description of the problem and legible return address. DO NOT send a separate letter; 
include all correspondence with the unit. Please do not include your own hardware such as            non-
Ramsey cabinets, knobs, cables, external battery packs and the l ke. Ramsey Electronics, Inc., 
reserves the right to refuse repair on ANY item in which we find   excessive problems or damage due 
to construction  methods. To assist customers in such situations, Ramsey     Electronics, Inc., reserves 
the right to solve their needs on a case-by-case basis. 
The repair is $50.00 per hour, regardless of the cost of the kit. Please understand that our technicians 
are not volunteers and that set-up, testing, diagnosis, repair and repacking and paperwork can take 
nearly an hour of paid employee time on even a simple kit. Of course, if we find that a part was 
defective in manufacture, there will be no charge to repair your kit (But please realize that our 
technicians know the difference between a defective part and parts burned out or damaged through 
improper use or assembly). 
4. REFUNDS: You are given ten (10) days to examine our products. If you are not satisfied, you may 
return your unassembled kit with all the parts and instructions and proof of purchase to the factory for 
a full refund. The return package should be packed securely. Insurance is recommended. Please do 
not cause needless delays, read all information carefully. 

Содержание DDF1

Страница 1: ...ign 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...

Страница 2: ...ITS DDF1 Doppler Direction Finder HR Series HF All Mode Receivers QRP Series HF CW Transmitters CW7 CW Keyer CPO3 Code Practice Oscillator QRP Power Amplifiers RAMSEY MINI KITS Many other kits are ava...

Страница 3: ...Publication No MDDF1 Price 5 00 TABLE OF CONTENTS Introduction to the DDF1 4 DDF1 Circuit Description 4 Parts List 11 DDF1 Assembly Steps 14 Component Layout 17 Schematic Diagram 18 Initial Testing 2...

Страница 4: ...ion The signal received from an antenna moving away from the source of transmission appears to be lower in frequency than that of the actual trans mission Imagine a receiving antenna moving in a circu...

Страница 5: ...the received signal in megahertz dF The Doppler shift in Hertz R Radius of antenna rotation in inches fc Carrier frequency of the received signal in megahertz As an example let s calculate how fast t...

Страница 6: ...Doppler RDF circuit see the block dia gram of Figure 2 An 8 kHz clock oscillator drives a binary counter The out put of the counter performs three synchronized functions spin the antenna drive the LE...

Страница 7: ...nfigured as an astable multivibrator C26 R27 and R28 R29 determine the multivibrator s oscillation frequency R27 and R28 are series connected to allow fine tuning the oscillation frequency to 8 kHz It...

Страница 8: ...ED display sequences through four direction indicating LED s then switches to the next antenna Each direction indicating LED represents a heading change of 22 5 degrees The third synchronized function...

Страница 9: ...verage rapid Doppler tone changes caused by multipath reflected signals noise or high audio peaks associated with speech A digitized representation of the Doppler tone is provided at the digi tal filt...

Страница 10: ...11 similar to the low level lock out function Phase Correction If the audio output of the Doppler RDF FM receiver is incorrectly phased S3 phase invert can fix that If phasing is incorrect LED directi...

Страница 11: ...31 34 35 38 43 45 1 56K ohm green blue orange R12 2 68K ohm blue gray orange R29 33 1 100K ohm brown black yellow R18 3 220K ohm red red yellow R15 21 23 1 PC mount 10K trimmer potentiometer 103 R50...

Страница 12: ...8 1 74HC161 IC 16 pin DIP IC U7 1 74HC4051 IC 16 pin DIP IC U5 1 74HC4515 IC 24 pin DIP IC U11 3 324 Op Amp IC 14 pin DIP marked 324 U1 2 3 2 555 Timer IC 8 pin DIP IC marked 555 U4 6 MISCELLANEOUS CO...

Страница 13: ...holes Second whenever possi ble we install in an order that fits our Learn As You Build Kit building phi losophy This entails describing the circuit that you are building instead of just blindly inst...

Страница 14: ...or con nection Be sure to push the part as close to the circuit board as it will go as the alignment of this part is important in getting the case holes to line up with the part Solder all three leads...

Страница 15: ...ensure proper polarity See the parts diagram for proper placement The capacitor should fit snugly down to the PC board Now it s time to build the power supply regulation portion of the circuit We nee...

Страница 16: ...g for fox transmitters in baby strollers at the mall Let s get back to it Next we ll work on the digital filter section of the circuit Be sure to mount the components as close to the printed circuit b...

Страница 17: ...DDF1 17 DDF 1 MAIN BOARD PARTS LAYOUT DIAGRAM...

Страница 18: ...DDF1 18...

Страница 19: ...DDF1 19...

Страница 20: ...ed 104 That concludes most of the digital circuitry included in your kit take a mo ment to recheck your work We ll get started now on the audio processing section of the direction finder kit 39 Locate...

Страница 21: ...e parts layout diagram 53 Install R16 10K ohm brown black orange There is another plated through hole inside the silkscreen for R16 that is not the installation hole Be sure to install the resistor le...

Страница 22: ...ed red yellow 72 Install R22 10K ohm brown black orange 73 Install electrolytic capacitor C8 1 uF Be sure to orient the part cor rectly 74 Install R18 100K ohm brown black yellow 75 Install the last 3...

Страница 23: ...ed flush to the circuit board and solder into place The switches are DPDT type so up down orientation is not critical Check the placement of each switch by test fitting the circuit board into the uppe...

Страница 24: ...lder into place The main board assembly is complete You are that much closer to a func tioning Doppler DF system Take a break you have accomplished the big gest chunk of the kit When we start up again...

Страница 25: ...ntenna whip to each ANTMTG board 1 Install the 1N4148 diode on the ANTMTG circuit board in the same manner in which you installed them on the switcher keeping those leads as short as possible 2 Instal...

Страница 26: ...the an tennas themselves To create the necessary holes for both the mounting screw as well as the cable inputs take your soldering iron and melt a half moon shape in the side of the lid to allow clear...

Страница 27: ...ap can be permanently installed using a hot melt glue gun or other sealer of your choice INITIAL TESTING Basic Testing It is wise to review your workmanship looking for circuit shorts or opens prior t...

Страница 28: ...respectively Verify the presence of a square wave signal on pins 2 4 6 and 8 of buffer U12 Signal Level Indicators The following test uses an audio signal generator to simulate the presence of the Dop...

Страница 29: ...on takes place Calibration Control Verify the function of the calibrate control by adjusting the audio generator equal to the antenna rotation frequency At this point only a single LED will illuminate...

Страница 30: ...nna switcher to an FM receiver or transceiver tuned to a strong NOAA weather broadcast signal Caution Make sure you disable transmit mode if you are using a transceiver Apply power to the RDF unit and...

Страница 31: ...ith respect to your location and the position of the car Have the driver slowly circle while you observe the display You should see the di rection indicating LED move in the opposite direction as the...

Страница 32: ...UHF frequency FINAL CASE UP When all your tests are complete you will want to case up your main PC board First attach the overlay to the plastic case front The best only way to do this is to spray th...

Страница 33: ...ts and or bad solder connections Working backwards through the assembly steps will often lead you to the problem Please understand that it is nearly impossible to troubleshoot by phone any specific qu...

Страница 34: ...DDF1 34 DDF 1 ANTENNA SCHEMATIC DIAGRAM...

Страница 35: ...e assured that the 1K ohm resistors are actually the missing 10 K parts Hum m m I guess the red band really does look orange Ramsey Electronics project kits are packed with pride in the USA If you bel...

Страница 36: ...itial Testing 22 Ramsey Warranty 23 Price 5 00 Ramsey Publication No MDDF1 Instruction manual for RAMSEY MODEL NO DDF1 DOPPLER RADIO DIRECTION FINDER REQUIRED TOOLS Soldering Iron WLC100 Thin Rosin Co...

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