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Vectronics VEC-1002K Owner's Manual

2 meter fm receiver 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-1002K

  • 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

    When it comes to pulling in weak signals, the VEC-1002K rivals many commercially-built transceivers. In addition, its electronic tuning control covers only those frequencies where FM repeaters operate. And, just like a professional transceiver, the VEC-1002K gives you a highly-effective adjustable squelch to eliminate background noise between transmissions.
  • Page 4: Before You Start Building

    VEC-1002K Owner's Manual 2 Meter FM Receiver Kit Universal Kit-building Tools: Although your particular kit may require additional items to complete, virtually all construction projects require a work area outfitted with the following tools and supplies: ! 30 to 60 Watt Soldering Iron...
  • Page 5 VEC-1002K Owner's Manual 2 Meter FM Receiver Kit 3. Faulty Solder Connections: Inspect for cold solder joints and solder bridges. Cold solder joints happen when you don't fully heat the connection-- or when metallic corrosion and oxide contaminate a component lead or pad.
  • Page 6 VEC-1002K Owner's Manual 2 Meter FM Receiver Kit Resistor Color Code Black = 0 (tens) Blue 1st Digit Brown = 1 (hundreds) Violet = 7 2nd Digit = 2 (K) Gray Multiplier Orange = 3 (10K) White = 9 Yellow = 4 (100K)
  • Page 7: Parts List

    VEC-1002K Owner's Manual 2 Meter FM Receiver Kit confused by markings on the case, remember the uncut negative lead is slightly shorter than the positive lead. Diodes: Diodes are also polarized devices that must be installed correctly. Always look for the banded or cathode end when installing, and follow instructions carefully.
  • Page 8 VEC-1002K Owner's Manual 2 Meter FM Receiver Kit instructions. If you can't positively identify an unfamiliar item on the basis of the information given, set it aside until all other items are checked off. You may then be able to identify it by process of elimination. Finally, your kit will go together more smoothly if parts are organized by type and arranged by value ahead of time.
  • Page 9 " Part Description Designation DPDT push-button power switch RCA phono jack, pc-mounted 3.5mm stereo jack (mini-jack) 8-pin IC socket (for U2) 24-pin IC socket (for U1) 9-volt battery snap clip plastic cable tie PC board for VEC-1002K VEC-1002K Owner's Manual...
  • Page 11 VEC-1002K Owner's Manual 2 Meter FM Receiver Kit Generally, it's easier to install small close-to-the-board parts first, and then mount larger stand-up parts second. Delicate parts, such as air-wound coils, go on the PC board last. Notice the directions use two sets of check boxes. Check one when a step is complete and use the other for double-checking your work before operation.
  • Page 12 VEC-1002K Owner's Manual 2 Meter FM Receiver Kit ! ! 3. Find a 470 ohm resistor (yellow-violet-brown). Install at R2 and solder. ! ! 4. Find two (2) 2.2K ohm resistors (red-red-red). Install one at R11 and solder. ! ! 5. Install a 2.2K resistor (red-red-red) at R14 and solder.
  • Page 13 VEC-1002K Owner's Manual 2 Meter FM Receiver Kit ! ! 7. Install and solder a .001 uF at C14 ! ! 8. Install and solder a .001 uF at C25 ! ! 9. Install and solder a .001 uF at C32 ! ! 10.
  • Page 14 VEC-1002K Owner's Manual 2 Meter FM Receiver Kit ! ! 4. Find two (2) 27 pF multilayer capacitors (27 or 270). Install one at C2 and solder. ! ! 5. Install a 27 pF multilayer capacitor at C4 and solder.
  • Page 15 VEC-1002K Owner's Manual 2 Meter FM Receiver Kit ! ! 1. Find the 1N751 zener diode--the only diode supplied with the kit. Like electrolytic capacitors, zener diodes are polarized and work only when installed one way. Diode polarity is indicated by the black band located at one end of the glass body.
  • Page 16 VEC-1002K Owner's Manual 2 Meter FM Receiver Kit ! ! 2. Make a jumper with a .275" span. Install at JMP2 and solder. ! ! 3. Make another jumper with a .275" span. Install at JMP3 and solder. ! ! 4. Make a jumper with a .3" span. Install at JMP4 and solder.
  • Page 17 VEC-1002K Owner's Manual 2 Meter FM Receiver Kit ! ! 7. Locate two (2) 10K potentiometers. Install one at R6 (tuning), making sure the pot is firmly seated before soldering in place. ! ! 8. Install the second 10K pot at R16 (volume), checking seating before soldering.
  • Page 18 VEC-1002K Owner's Manual 2 Meter FM Receiver Kit amount of solder. Eventually, the enamel insulation should begin breaking down, allowing solder to coat and adhere to the wire (it may be easier to perform this operation with the coil threaded onto the screw).
  • Page 19: Testing And Alignment

    VEC-1002K Owner's Manual 2 Meter FM Receiver Kit extreme care during insertion, and move slowly. It's very easy to miss a socket opening and fold a pin underneath the body of the IC. ! ! 3. Find U2, a MC34119 8-pin gated audio amplifier IC. Position the keyed (or notched) end of U2 toward the left side of the board, so it coincides with the key in the socket.
  • Page 20 VEC-1002K Owner's Manual 2 Meter FM Receiver Kit Initial Checkout: To check out your kit you'll need a 9-volt flat-pack type alkaline battery and a 8- ohm extension speaker (or monaural headphones) outfitted with a 3.5-mm mini plug. Make sure the radio's power switch is OFF (button out) before loading the battery.
  • Page 21 • Output Level:......10 uV (-90 dBm) • Modulation: ......1-kHz tone at 5-kHz FM deviation Connect the generator output to your VEC-1002K's antenna jack using a 50-ohm patch cable. Plug in headphones or external speaker to monitor generator signal. 1. Set TUNE to 146.0 MHz and SQUELCH counter-clockwise (open).
  • Page 22 Warning: Do not connect the analyzer directly to your VEC-1002K, or damage may result. Install a 47-ohm resistor on the VEC-1002K antenna jack and follow the test procedure outlined above for alignment using a HT. If your analyzer has a built-...
  • Page 23 VEC-1002K Owner's Manual 2 Meter FM Receiver Kit U1, MC13135 Test Point Connect Counter Here 1. Connect the frequency-counter ground lead to a ground point (case or PC board). 2. Set the TUNE to 146.0 and apply power. 3. Touch counter probe to pin 3 and adjust L4 for a counter reading of 135.3 MHz.
  • Page 24 Use only a weak signal with clearly-audible background hiss. Note that L3 is non-critical, and requires no adjustment. When peaked, the VEC-1002K should render "solid copy" on FM signals of 1- uV or less. OPERATING INSTRUCTIONS...
  • Page 25: In Case Of Difficulty

    Your radio needs a minimum of 7-8 volts in order to work properly. IN CASE OF DIFFICULTY The VEC-1002K design has been thoroughly field tested, and is known to be both reliable and "forgiving" of construction errors. If you have difficulty with your unit, the cause may be something as simple as a broken cable or a dead battery.
  • Page 26 VEC-1002K Owner's Manual 2 Meter FM Receiver Kit Does not turn on: Check battery condition, snap clip, and power leads. Also, make sure lead polarity is correct (red to +, black to GND). Make sure power switch is "on". Also, squelch may be locked "on" (see following). Check operating voltages.
  • Page 27 VEC-1002K Owner's Manual 2 Meter FM Receiver Kit 1.2-3.0 (no sig) *Squelch open voltage (becomes 3.8 when squelch is "logic-high" or closed) If you find one or more pins that read radically different from the chart value, it may indicate the device is bad--or it may mean a circuit problem exists in that portion of the radio.
  • Page 28 THEORY OF OPERATION AND SPECIFICATIONS Technical Circuit Description: The VEC-1002K FM is a sensitive voltage-tunable dual-conversion NBFM receiver that includes an effective squelch circuit and gated AF-amplifier IC for speaker operation. Incoming signals are filtered through a bandpass filter at L1/L2 to reduce out-of-band interference, then boosted by low-noise preamplifier Q1.
  • Page 30 VEC-1002K Owner's Manual 2 Meter FM Receiver Kit ENCLOSURE Vectronics has designed a matching enclosure just for your VEC-1002K 2 Meter FM Receiver Kit. The matching enclosure is an all metal box which includes knobs, hardware, decals, and rubber feet. Model: VEC-1000KC.