Vectronics VEC-841K Owner's Manual

Tunable ssb/cw audio filter kit

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IMPORTANT WARRANTY INFORMATION! PLEASE READ
Return Policy on Kits When Not Purchased Directly From Vectronics: Before continuing
any further with your VEC kit check with your Dealer about their return policy. If your Dealer
allows returns, your kit must be returned before you begin construction.
Return Policy on Kits When Purchased Directly From Vectronics: Your VEC kit may be
returned to the factory in its pre-assembled condition only. The reason for this stipulation is,
once you begin installing and soldering parts, you essentially take over the role of the device's
manufacturer. From this point on, neither Vectronics nor its dealers can reasonably be held
accountable for the quality or the outcome of your work. Because of this, Vectronics cannot
accept return of any kit-in-progress or completed work as a warranty item for any reason
whatsoever. If you are a new or inexperienced kit builder, we urge you to read the manual
carefully and determine whether or not you're ready to take on the job. If you wish to change
your mind and return your kit, you may--but you must do it before you begin construction, and
within ten (10) working days of the time it arrives.
Vectronics Warrants: Your kit contains each item specified in the parts list.
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. Also, make certain an alternative
part hasn't been substituted for the item you're missing. If a specific part is no longer
available, or if Engineering has determined that an alternative component is more suitable,
Vectronics reserves the right to make substitutions at any time. In most cases, these changes
will be clearly noted in an addendum to the manual.
Defective Parts:
Today's electronic parts are physically and electrically resilient, and
defective components are rare. However, if you discover an item during your pre-construction
inventory that's obviously broken or unserviceable, we'll replace it. Just return the part to
Vectronics at the address below accompanied with an explanation. Upon receipt, we'll test it.
If it's defective and appears unused, we'll ship you a new one right away at no charge.
Missing or Defective Parts After You Begin Assembly:
damaged after construction begins are not covered under the terms of this warranty. However,
most parts supplied with VEC kits are relatively inexpensive and Vectronics can replace them
for a reasonable charge. Simply contact the factory with a complete description. We'll
process your order quickly and get you back on track.
Factory Repair After You Begin Assembly: Kits-in progress and completed kits are
specifically excluded from coverage by the Vectronics warranty. However, as a service to
customers, technicians are available to evaluate and repair malfunctioning kits for a minimum
service fee of $18.00 (½ hour rate) plus $7.00 shipping and handling (prices subject to
change). To qualify for repair service, your kit must be fully completed, unmodified, and the
printed circuit board assembled using rosin-core solder. In the event your repair will require
more than an hour to fix (or $36.00, subject to change), our technicians will contact you in
advance by telephone before performing the work. Defective units should be shipped prepaid
to:
Vectronics
1007 HWY 25 South
Starkville, MS 39759
Parts and materials lost or

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Summary of Contents for Vectronics VEC-841K

  • Page 1 From this point on, neither Vectronics nor its dealers can reasonably be held accountable for the quality or the outcome of your work. Because of this, Vectronics cannot accept return of any kit-in-progress or completed work as a warranty item for any reason whatsoever.
  • Page 2 When shipping, pack your kit well and include the minimum payment plus shipping and handling charges ($25.00 total). No work can be performed without pre-payment. Also, provide a valid UPS return address and a day time phone number where you may be reached.
  • Page 3: Tools And Supplies

    1 watt audio amplifier that will easily drive headphones or an external speaker. With the VEC-841K you bring up any hard to hear signal out of a “band pile up” for easy listening, or get rid of unwanted, annoying signals.
  • Page 4 VEC-841K Owner's Manual Tunable SSB/CW Audio Filter Kit 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. A 1K...
  • Page 5: Resistor Color Code

    VEC-841K Owner's Manual Tunable SSB/CW Audio Filter Kit double-sided board with plate-through holes. Should this happen, try heating the pad again and inserting a common pin into the hole. Solder won't stick to the pin's chromium plating. When the pad cools, remove the pin and insert the correct component.
  • Page 6 VEC-841K Owner's Manual Tunable SSB/CW Audio Filter Kit Reading Capacitors: Unlike resistors, capacitors no longer use a color code for value identification. Instead, the value, or a 3-number code, is printed on the body. Electrolytic Value Code Ceramic Discs 1 uF...
  • Page 7: Parts List

    VEC-841K Owner's Manual Tunable SSB/CW Audio Filter Kit 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.
  • Page 8: Parts Placement Diagram

    VEC-841K Owner's Manual Tunable SSB/CW Audio Filter Kit 2.2K ohm resistor (red-red-red) 4.7K ohm resistor (yellow-violet-red) R5, R6, R7, R8 R18, R33 10 10K ohm resistor (brown-black-orange) R1, R9, R12, R13 R19, R20, R23 R30, R31, R34 24K ohm resistor (red-yellow-orange)
  • Page 10 VEC-841K Owner's Manual Tunable SSB/CW Audio Filter Kit 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. Once you begin construction, your kit will be non-returnable.
  • Page 11 VEC-841K Owner's Manual Tunable SSB/CW Audio Filter Kit ! ! 6. Locate resistor R11. This is a 2.2K resistor (red-red-red). Carefully bend the leads close to the resistor body as in Step #1. Insert at R11, solder in place and trim the leads.
  • Page 12 VEC-841K Owner's Manual Tunable SSB/CW Audio Filter Kit ! ! 18. Locate resistor R20. This is a 10K resistor (brown-black-orange). Carefully bend the leads close to the resistor body as in Step #1. Insert at R20, solder in place and trim the leads.
  • Page 13 VEC-841K Owner's Manual Tunable SSB/CW Audio Filter Kit ! ! 30. Locate resistor R4. This is a 130K resistor (brown-orange-yellow). Carefully bend the leads close to the resistor body as in Step #1. Insert at R4, solder in place and trim the leads.
  • Page 14 VEC-841K Owner's Manual Tunable SSB/CW Audio Filter Kit ! ! 9. Locate capacitor C17 (.1uF). Insert at C17, solder in place and trim the leads. ! ! 10. Locate capacitor C2 (.01uF). The is a disc ceramic capacitor and will be marked with either a "103"...
  • Page 15 VEC-841K Owner's Manual Tunable SSB/CW Audio Filter Kit ! ! 4. Locate capacitor C14 (470uF). Insert at C14, observing correct polarity, solder in place and trim the leads. ! ! 5. Locate capacitor C13 (10uF). This is an electrolytic capacitor and will be marked "10uF".
  • Page 16 VEC-841K Owner's Manual Tunable SSB/CW Audio Filter Kit ! ! 7. Install one of the 1" jumpers at JMP2. This wire is stranded, so be sure that all strands are in the hole. Once installed, solder in place and trim the leads.
  • Page 17 VEC-841K Owner's Manual Tunable SSB/CW Audio Filter Kit Important Note: Refer to the "Parts Placement" section for the proper orientation of Pin 1 of the IC sockets. Proper orientation is essential to ensure that the ICs are installed properly. ! ! 1. Locate a 14-pin IC socket. Install it at the location for U1, ensuring proper orientation of pin 1.
  • Page 18 VEC-841K Owner's Manual Tunable SSB/CW Audio Filter Kit ! ! 1. Locate resistor R26. This is a 500K linear dual potentiometer with six (6) legs. This part will be marked "105-2011" on the backside of the part. ! ! 2. Insert R26 into its mounting holes until it stops, making sure that all six (6) legs are inserted into the board.
  • Page 19: Testing And Alignment

    TESTING AND ALIGNMENT The correct way to test and align the VEC-841K is with a calibrated audio signal generator and oscilloscope. The alignment is very simple and easy, so it will not take much time. We have written a simple test and alignment procedure for you to follow.
  • Page 20 SW2 to the ON position, before you put the headphones on your ears. 1. Turn ON all test equipment and set SW2 on the VEC-841K to ON. You may hear a pop in the external speaker. You may also hear the audio signal from the signal generator too.
  • Page 21 9. Using the small plastic alignment tool, set R25 so the signal displayed on the scope is at maximum amplitude. 10. Set SW1 on the VEC-841K to the IN position (NOTCH). The signal on the scope should decrease to the same level as in step #7. If not, then something was done wrong, or there is something wrong with the filter.
  • Page 22: Operating Instructions

    SLEEVE of the 2.1mm coaxial DC plug. Before plugging in the power to the VEC-841K, set SW2 to the OUT (OFF) position. If you choose to use a pair of headphones, then DO NOT plug the headphones into the filter until SW2 is set to the IN position (ON).
  • Page 23: In Case Of Difficulty

    The PEAK/NOTCH switch (SW1) is a dual function switch. The IN position is NOTCH, while the OUT position is PEAK. How you are using the VEC-841K, dictates what position SW1 will be in. Placing SW1 in the PEAK position you will be able to PEAK desired signals to bring them up where they are more readable and out of the SSB noise.
  • Page 26 VEC-841K Owner's Manual Tunable SSB/CW Audio Filter Kit...

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