Depending on various factors, you should see at least 15db of
attenuation between polarizations on a dual-pol antenna. Theoretically,
you should see 20db. In any case, 15db is enough attenuation even on the
same channel to operate two links reliably.
Jason Wallace wrote:
When antennas are separated by normal distances, they can only "see"
each other electromagnetically (ie, radio waves). However, when they
are close they will experience capacitive and inductive coupling.
Dual pol antennas work fine when only receiving (as in those large
satellite dishes from the 80's that used 90° pol changes between
adjacent channels). I think you will always have trouble overloading
the receiver when transmitting with this setup.
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