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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:

    Parts  and  materials  lost  or 

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 
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. 

Summary of Contents for VEC-821K

Page 1: ...external speaker Eight poles of active IC filt ering gives super steep CW skirts for performance that few tunable filters can match interference is up to 60 dB down one octave away Razor sharp selecti...

Page 2: ...eserves 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 electrica...

Page 3: ...List 11 Parts Placement Diagram 12 Step By Step Assembly 12 Phase 1 13 Phase 2 15 Phase 3 17 PC Board Inspection 20 Testing and Alignment 20 Operating Instructions 21 Receiver or Scanner Operation 21...

Page 4: ...OOLS AND SUPPLIES Construction Area Kit construction requires a clean smooth and well lighted area where you can easily organize and handle small parts without losing them An inexpensive sheet of whit...

Page 5: ...ridges form when a trail of excess solder shorts pads or tracks together see Soldering Tips below 4 Omitting or Misreading a Part This is easier to do than you might think Always double check to make...

Page 6: ...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 For ICs or multi pin parts use desoldering braid to remove...

Page 7: ...inventory resistors first separate them into groups by multiplier band make a pile of 10s 100s Ks 10Ks etc Next sort each group by specific value 1K 2 2K 4 7K etc This procedure makes the inventory e...

Page 8: ...evices and must be oriented correctly during installation If you become confused by markings on the case remember the uncut negative lead is slightly shorter than the positive lead Diodes Diodes are a...

Page 9: ...d of the device A corresponding mark will be silk screened on the PC board and printed on the kit s parts placement diagram To identify specific IC pin numbers for testing purposes see the diagram bel...

Page 10: ...1 5 6 ohm 1 2 watt resistor green blue gold R19 1 1K ohm resistor brown black red R2 1 1 8K ohm resistor brown gray red R1 6 24 3K ohm resistor red yellow orange red R5 R8 R10 R13 R14 R15 1 91K ohm re...

Page 11: ...nything is missing or broken refer to the warranty instructions for replacing missing or damaged parts Note that part designators such as R1 C3 etc appear on a silk screened legend on the component mo...

Page 12: ...orange Carefully bend the leads close to the resistor body as in Step 1 8 Insert R4 into its mounting holes so the resistor body rests against the board Solder in place and trim the leads 9 Locate res...

Page 13: ...y rests against the board Solder in place and trim the leads 27 Locate resistor R15 This is 24 3K resistor red yellow orange red Carefully bend the leads close to the resistor body as in Step 1 28 Ins...

Page 14: ...19 are made of a polystyrene type material Avoid overheating these components when soldering to prevent melting the capacitor body 1 Locate capacitor C12 1000pF The is a polystyrene capacitor and will...

Page 15: ...r both leads in place making sure the capacitor remains seated Remove excess leads on the bottom side of the board with diagonal cutters 17 Locate capacitor C2 1uF This is a disc ceramic type capacito...

Page 16: ...r glass type material This part will have a band on one end indicating the cathode end of the diode 27 Insert D2 into its mounting holes so the diode body rests against the board Be sure to observe th...

Page 17: ...sure to orient the negative side of the capacitor properly Please refer to the section titled Parts Placement Figure 1 for correct orientation of C1 Once installed then solder in place and trim the ex...

Page 18: ...d SPKR on the circuit board Solder in place and trim the excess lead 22 Take another 3 piece of insulated wire and insert one end into the hole silk screened G on the circuit board Solder in place and...

Page 19: ...the right tools One very convenient item for freeing soldered in parts is a solder sucker This consists of a suction bulb or a spring loaded vacuum pump that draws molten solder away from the pad and...

Page 20: ...wever in these positions the filter will let slightly more noise through but in some cases this may be desirable The best way to see which position works the best is to try it This way you can really...

Page 21: ...en you switch to the 110 cutoff you will notice that the signal sounds cleaner than before You can now fine tune the radio tuning knob for the best received signal If using a communications receiver o...

Page 22: ...ed please refer to the warranty instructions on the inside front cover THEORY OF OPERATION AND SPECIFICATIONS Circuit Description The VEC 821K uses two LM747 operational amplifier integrated circuits...

Page 23: ...SCHEMATIC...

Page 24: ...VEC 821K Instruction Manual Super CW Filter Kit 25 VEC 821K...

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