[Elecraft] Help with VCO Alignment on K2

Wed Mar 17 10:16:00 2004

Hi

This problem comes up from time to time. Try squeezing the turns on T5 =
closer together. This should decrease the voltage some. If that does not =
work then remove T5 and rewind it with 17 turns on the primary. I have =
seen this enough times that I always wind T5 with 17 turns. I can always =
remove one turn if I need to a lot easier than add one turn.

Don Brown
KD5NDB
  ----- Original Message -----=20
  From: Kenny Richards<mailto:[email protected]>=20
  To: [email protected]<mailto:[email protected]>=20
  Sent: Wednesday, March 17, 2004 12:14 AM
  Subject: [Elecraft] Help with VCO Alignment on K2

  I've run into another problem I can't figure out with VCO alignment=20
  during construction of my K2.  (very new kit, bought in the last 4=20
  months)

  I'm at the stage were I'm suppose to set L30 to get a 6v reading =
across=20
  the left side of R30. (VFO set to 4000khz)   I had originally messed =
up=20
  and installed the wrong slug tuned inductor for L30, but once I fixed=20
  that, I still can't get the right voltage.  Right now I'm reading a=20
  swing of about 8v down to 6.3v, the voltage is stable, I just can't=20
  dial it down far enough.

  According to the instructions there are a number of things I could =
have=20
  messed up.  I already fixed the L30 problem and I'm 99% sure I have =
the=20
  right cap in for C72.  The only other thing suggested is winding of T5 =

  could be wrong, but I'm pretty sure it is correct also for two =
reasons;=20
  first because I bought them pre-wound and second because I've counted=20
  them several times.

  Any other suggestions on what I could have done wrong?  Would putting=20
  T5 in wrong screw things up like this?  I haven't got to the point yet =

  of pulling it off the board, but it was my next step.

  Thanks,
  Kenny, KU7M

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