[Elecraft] K3: RE: OT Expert 1k Amplifier

[Doug Faunt N6TQS +1-510-655-8604]

   From: "Enno J. Korma, PF5X" <cw at dx.nl>
   Date: Thu, 22 Nov 2007 20:40:30 -0000

   ALC interfacing is recommended with this kind of linear. I have already
   asked on this reflector how this should be done with the K3. The K3 delivers
   a positive
   ALC voltage whereas the linear - like other types - needs a negative
   voltage. Wayne had replied that this needs a little external circuitry
   which will be described in due time. (Looking to the schematics I believe
   the K3 does not carry any negative voltage line at all).

Take a look at the io board- there's a negative voltage generator
there that drives the RS232 level converter.  Page 9 of the
downloadable schematics, KIO3 Main, sheet 2.  

It's not really our Elecraft until we've modified it ourselves.

73, doug