[Elecraft] K3 APF

[Jeff Cochrane - VK4BOF]

Thanks for the information Lyle, I appreciate it.
Like I said, I have no clue with CW and without a rhythmic bone in my body I will probably never get this CW thing..........nor any of it's finer points.
(Thank god they finally implemented codeless licences over here!) :-)
I didn't realise that there was a 180 degree shift, but I do now. (learning all zee time.)


Jeff Cochrane - VK4BOF
Innisfail, QLD, Australia
Elecraft K3# 4257

  ----- Original Message ----- 
  From: Lyle Johnson 
  To: elecraft at mailman.qth.net 
  Sent: Monday, November 01, 2010 11:19 AM
  Subject: Re: [Elecraft] K3 APF


  The APF has a rapid 180 degree phase shift as you pass through its 
  center frequency.  This is fine fore CW, but would wreak havoc on a 
  PSK31 signal.  The K3s narrow filters (nomianl 50 Hz) are very good for 
  local PSK31 decoding.  In addition, most PC-based software includes 
  well-matched filters for PSK31 decoding.

  The APF is really intended for CW operation only.

  73,

  Lyle KK7P

  > What are the pro's and cons of implementing it for the digital modes too?

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