RE: [amsat-bb] FD, VX5R, FM38-39

[Bob Bruninga <bruninga@xxxxxxxxxxxxx>]

On Mon, 10 Jul 2000, Tony Langdon wrote:

> As for verticals, forget them, they're useless, particularly on 70cm.  If
> you want an omni, try an eggbeater, turnstile or Lindenblad.  All of these
> will do much better than a vertical on 70.  

This is too broad of a statement to let stand as is.  THis statement is
TRUE for a terrestrial vertical designed for gain at the horizon, but I
disagree completely beyond that.  a 3/4 wave 435 MHz vertical whip over a
good groundplane has almsot 8 dBi gain above 30 degrees.  I have found NO
other  "omni" antenna that can get even close to that.  And the downlinks
of all existing birds are predominatly vertical.  You cannot afford to
give up the 3 dB by going to any cross polarized "omni".

No, it does not work to the horizon, but the bird is 6 dB further down
there anyway, and NO OMNI can hear the weak UHF downlinks  there
either...

Just another opinion...

de WB4APR, bob


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