Vectronics VEC-821K Manual

Super cw filter kit with 1 watt audio amplifier

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Super
wit h 1 Wat t aud io am p lifie r
Incred ibly narro w 8 0 Hz b and w id t h
let s yo u p ull Mo rs e c o de signals o ut
o f heavy int e rfere nc e o n any ham rad io
b and . Po we rful o ne wat t aud io amp lifie r
d rive s exte rnal s p eake r. Eight p ole s o f
active IC filt ering gives s up e r st e ep CW
sk irt s fo r p erfo rmance t hat fe w t unab le
filt ers c an mat c h– int e rfere nc e is up t o
6 0 d B d o wn o ne o ct ave aw ay.
-Razor sharp selectivity dramatically
snatches out your desired CW signal from a mass of interference.
-Select from 3 bandwidth: 80, 1 10, 1 80 H z. Center frequency
is a pleasant 75 0 H z.
-1 5 dB noise reduction relieves fatigue. Automatic noise limiter
knocks down static crashes and other impulse noises. Plugs into
your transceiver's phone jack. Drives external speaker to one watt.
-Requires 9 to 1 8VDC, 3 00 mA
Skill Level 1
Simple:
Calls for a few basic tools-
a soldering iron, cutters, plyers, wire strippers,
and a small screw driver. Does not require test
equipment for final adjustment or tuning.
VECTRONICS
H igh-pe rform anc e e le c tronic k it s ... fun t o build and use !
C W Filt e r
Kit
model VEC-821K
shown with optional cabinet
R

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Summary of Contents for Vectronics VEC-821K

  • Page 1 Super C W Filt e r wit h 1 Wat t aud io am p lifie r model VEC-821K shown with optional cabinet Incred ibly narro w 8 0 Hz b and w id t h let s yo u p ull Mo rs e c o de signals o ut o f heavy int e rfere nc e o n any ham rad io b and .
  • Page 2 Missing Parts: If you determine, during your pre-construction inventory, that any part is missing, please contact Vectronics and we'll send the missing item to you free of charge. However, before you contact Vectronics, please look carefully to confirm you haven't misread the marking on one of the other items provided with the kit.
  • Page 3: Table Of Contents

    TABLE OF CONTENTS Introduction Tools and Supplies................5 Before You Start Building ..............6 Soldering Tips: ................6 Desoldering Tips: ................. 7 Work Habits: ................7 Sorting and Reading Resistors:............ 8 Reading Capacitors:..............8 Diodes: ..................9 Transistors: .................. 9 Integrated Circuits: ...............
  • Page 4: Introduction

    “cleaning up” CW signals effortless and easy. Featuring razor sharp selectivity and extremely steep sided skirts, even the weakest signal stands out. Also, the VEC-821K has a 1 watt audio amplifier built in that will easily drive headphones or an external speaker.
  • Page 5: Before You Start Building

    BEFORE YOU START BUILDING Experience shows there are four common mistakes builders make. Avoid these, and your kit will probably work on the first try! Here's what they are: 1. Installing the Wrong Part: It always pays to double-check each step.
  • Page 6: Desoldering Tips

    VEC-821K Instruction Manual Super CW Filter Kit Not Good Good Desoldering Tips: If you make a mistake and need to remove a part, follow these instructions carefully! First, grasp the component with a pair of hemostats or needle-nose pliers. Heat the pad beneath the lead you intend to extract, and pull gently.
  • Page 7: Sorting And Reading Resistors

    Sorting and Reading Resistors: The electrical value of resistors is indicated by a color code (shown below). You don't have to memorize this code to work with resistors, but you do need to understand how it works: Resistor Color Code Black = 0 (tens) Blue...
  • Page 8: Diodes

    VEC-821K Instruction Manual Super CW Filter Kit Electrolytic Value Code Ceramic Discs 1 uF 10 pF = 100 (.001 uF) (.1 uF) Multilayer 100 pF = 101 (270 pF) 1000 pF = 102 .001 uF = 102* .01 uF = 103 .1 uF...
  • Page 9: Integrated Circuits

    Metal Can Device Plastic Device Tab-cooled Device Emitter Metal Tab Flat Side Integrated Circuits: Proper IC positioning is indicated by a dot or square marking located on one end of the device. A corresponding mark will be silk-screened on the PC board and printed on the kit's parts-placement diagram. identify specific IC pin numbers for testing purposes, see the diagram below.
  • Page 10: Parts List

    VEC-821K Instruction Manual Super CW Filter Kit PARTS LIST Your kit should contain all of the parts listed below. Please go through the parts bag to identify and inventory each item on the checklist before you start building. If any parts are missing or damaged, refer to the warranty section of this manual for replacement instructions.
  • Page 11: Parts Placement Diagram

    specifying a 1% tolerance. PARTS PLACEMENT DIAGRAM Figure 1 STEP-BY-STEP ASSEMBLY Before assembling your kit, please take time to read and understand the VEC kit warranty printed on the inside cover of this manual. Also, read through the assembly instructions to make sure the kit does not exceed your skill level.
  • Page 12: Phase 1

    VEC-821K Instruction Manual Super CW Filter Kit Phase 1: 1. Locate resistor R1. This is 1.8K resistor (brown-gray-red). Carefully bend the leads close to the resistor body to form right-angles (see following diagram). .4" 2. Insert R1 into its mounting holes so the resistor body rests against the board.
  • Page 13 18. Insert R5 into its mounting holes so the resistor body rests against the board. Solder in place and trim the leads. 19. Locate resistor R8. This is 24.3K resistor (red-yellow-orange- red). Carefully bend the leads close to the resistor body as in Step #1.
  • Page 14: Phase 2

    VEC-821K Instruction Manual Super CW Filter Kit against the board. Solder in place and trim the leads. 37. Locate resistor R17. This is 2.7 ohm resistor (red-violet-gold). Carefully bend the leads close to the resistor body as in Step 38. Insert R17 into its mounting holes so the resistor body rests against the board.
  • Page 15 capacitor remains seated. Remove excess leads on the bottom side of the board with diagonal cutters. 9. Locate capacitor C16 (1000pF). The is a polystyrene capacitor and will be marked with a "1000J" on the body. (actual value in pF). 10.
  • Page 16: Phase 3

    VEC-821K Instruction Manual Super CW Filter Kit 22. Locate capacitor C5 (.1uF). This is a disc ceramic type capacitor and will be marked "104" or "104Z" (actual value in uF). Carefully install C5, be sure not to chip the ceramic material.
  • Page 17 Placement" section Figure 1. 5. Carefully bend over the four corner pins of the socket against the solder pads on the solder side of the board. Solder in place. 6. Locate another 14 pin IC socket. 7. Install the IC socket at the U2 location on the circuit board. Be careful to orient the socket correctly according to the "Parts Placement"...
  • Page 18 VEC-821K Instruction Manual Super CW Filter Kit the main board. The lip and horizontal pins point toward the back of the board. Make sure the two headers horizontal pins are in line. Solder the pins on the main board. 16. Push the Switch PCB onto the horizontal pins till the PCB is in contact with the plastic lip.
  • Page 19: Pc Board Inspection

    It's also best to do this outdoors. Now that assembly and inspection is completed, you're ready to begin the testing and alignment phase of construction. TESTING AND ALIGNMENT The best way to test the VEC-821K is with a calibrated audio signal...
  • Page 20: Operating Instructions

    180 hertz cutoff is the second position from the left and is the widest filter cutoff. Probably the best method of seeing if the VEC-821K is working, or not, is to listen to some "on the air" CW signals. Then using SW1, select the filter cutoff position that best cleans up the signal being received.
  • Page 21: In Case Of Difficulty

    the insulated wire connected to the location on the circuit labeled INPUT. Apply the negative side of the audio signal to the insulated wire connected to the location on the circuit board labeled GND. Please refer to the "Parts Placement" section, Figure 1 for the location of both points on the circuit board.
  • Page 22: Filter Stops Filtering

    9-volts DC; 9-volt battery PCB Dimensions: 3" x 3" ENCLOSURE Vectronics has designed a matching enclosure just for your VEC-821K Super CW Filter Kit. The matching enclosure is an all metal box which includes knobs, hardware, decals, and rubber feet. The Vectronics...
  • Page 23: Schematic

    SCHEMATIC...
  • Page 24 VEC-821K Instruction Manual Super CW Filter Kit VEC-821K...

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