Ahhhhh......Lets do some math.......
Lets say the radio has a +20 dB output. For this example there is no
line loss. The antenna is rated at 30dB x-pole isolation. Here we go...
+20 dB
-30dB xpole
=
-10 dB receive level.
In my book that is high enough to kill any link of the same freq on the
opposite polarity....No???
Add to that a radio that needs to Rx and Tx on and off and you should
have receiver blocking.......
-B-
Matt Liotta wrote:
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.
-Matt
Jason Wallace wrote:
List,
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.
--
Bob Moldashel
Lakeland Communications, Inc.
Broadband Deployment Group
1350 Lincoln Avenue
Holbrook, New York 11741 USA
800-479-9195 Toll Free US & Canada
631-585-5558 Fax
516-551-1131 Cell
--
WISPA Wireless List: [email protected]
Subscribe/Unsubscribe:
http://lists.wispa.org/mailman/listinfo/wireless
Archives: http://lists.wispa.org/pipermail/wireless/
