[amsat-bb] Re: antenna separation

Henk, PA3GUO hamoen at iae.nl
Tue Jan 20 23:35:03 PST 2009

Hi Gus,

I do not have the answer on which distance to apply really.
Just to share my experience:

- here at home I never have had any issue with de-sensing
  and I do not use any filter or trick. with any of the
  radios (ts2000, ft817, thd7) it all works fine.

- field operations:
  I use no desensing filters either.
  145mhz antenna straight to the ft817
  435mhz antenna straight to the thd7
  antennas clambed together on eachother

  ... well, in this set-up it makes a BIG difference
  how I align the antennas. Moving one forward 1 cm does
  make a big difference. (sliding the booms across eachother)
  so not the boom2boom but element to element distance.
  but that is applicable for arrow like setup, not for
  permanent mounted constructions.

Mmm, I am afraid this information doesnt help you at all :-)


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