Hi Tom,
   The FF system would be entirely external to your FT-1KD -- It just connects between the rig's output the outboard linear, plus an input from the low level tap.  Therefore, transportable to a new rig with a low level out -- an easy addition, if necessary.  It could even be left in line with only a slight (1-2%) loss of power when not in use.

   Regarding the link, which looks to be more of a mechanical diagram than a schematic, it might not be GG.  The final neutralization ckt. resembles a grid driven stage.  The 1st-2nd stage coupling also appears to be more suitable for grid driven operation.  Perhaps, it's 3 grid driven stages?  Where have we seen that before...

73 & Good evening,
  Marv WC6W








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