[Elecraft] K2 - Low Pass Filter location

[Phil Kane]

  At present, I am using the K2/100 to feed a KAT100 antenna
  tuner.  A 160m-10m dipole is connected to the KAT100 as ANT 1
  through a low-pass filter and a dummy load is connected as ANT
  2, controlled from the K2.

  I am in the process of installing another antenna (40m-10m
  vertical) as my prime antenna and the dipole will be my
  secondary antenna.  For ease of operation I would install one
  as ANT 1 and the other as ANT 2. To take advantage of the
  low-pass filter for both antennas I am considering installing
  it between the K2/100 and the KAT2.

  My concern is with non-linear components in the KAT100 RF path
  that would generate harmonics and negate the advantage of the
  filter. Sampling diodes, as in a SWR bridge, are always suspect.
  If this is to be a problem, I would have to get a second filter,
  one for each antenna, which is something that I really don't want
  to do unless I have to.

  Anyone have words of wisdom based on practical experience?

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   73 de K2ASP - Phil Kane
   Elecraft K2/100   s/n 5402