On a side note, for general info, not necessarilly applicable to the task in
question....
Just because an antenna is Dual polarity, does not mean that both polarities
can be used at the same time by seperate signals. The wiring/circuitry (what
ever its called for an antenna) may be shared by the two pols, and bonded
togeather in some way. The DUAL Polarity antenna has to be designed with
two completely unique circuits to the antenna from the N connector, for both
pols to be used at the same time.
Secondly, Any two antenna elements near each other can work togeather two
create the antenna beam. Just like an Omni or Panel antenna that is really
just several antenna elements place appropriately to work togeather to
increase gain and reduce beamwidth.
Its very common to use both polarities at the same time for the same signal,
but a much different matter two have two seperate signals and not have them
interfere.
Polarity isolation is often not enough when smack dab right next to each
other. In theory 90 degrees off polarity equals 100% isolation, but in the
real world its closer to 15-20 DB, but is that considering between the
antennas elements right there, or signal comming from the enviroment getting
shielded out? Who knows.
Its very possible that 5.2 and 5.8 may not be far enough apart from each
other to colocate on the same antenna, however I don't know that for a fact
(harmonics and stuff like that). However, I am aware of many successfuly
using 2.4 and 5.8 from the same antenna.
The point I'm making is not what can and cant be done, just that not all
antennas Dual Pol antennas are designed the same, and what you can pull off
on one, may not be able to be pulled off on another type.
Tom DeReggi
RapidDSL & Wireless, Inc
IntAirNet- Fixed Wireless Broadband
----- Original Message -----
From: "Paul Hendry" <[EMAIL PROTECTED]>
To: "'WISPA General List'" <wireless@wispa.org>
Sent: Monday, January 16, 2006 2:23 PM
Subject: RE: [WISPA] Multiple Radios on Single antenna
Bob, are you saying that you are running 2 simultaneous links through 2
separate StarOS powered WRAP/CM9 on a single dual-polarized antenna with
no
other hardware? I have tried this on 2 separate links running horizontal
at
5.8 and vertical at 5.2 but still cannot download through one link without
impacting the other. What am I doing wrong? The radios are connected to
the
antennas via very short pigtails and about 2 feet of LMR-400.
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
Behalf Of Bob Moldashel
Sent: 16 January 2006 15:18
To: WISPA General List
Subject: Re: [WISPA] Multiple Radios on Single antenna
Why would you use an isolator???? If we are talking possible adjacent
channel interference then an isolator is not the cure, aditional
filtering would be. But most equipment should be able to work in this
environment without it. I have sites that have 4 WRAP boards with CM9's
sitting right next to each other on the next adjacent channel with no
issues.
In addition, the loss of power is not acceptable (though it wouldn't be
half power at 5GHz.).
-B-
Richard Goodin wrote:
Go to some of the hard core LMR delers and ask for isolators, (They
will cut your power in half). Your LMR dealer will need to know
power, frequency, type of connectors. This may work, I do not know.
----- Original Message -----
*From:* Paul Hendry <mailto:[EMAIL PROTECTED]>
*To:* 'WISPA General List' <mailto:wireless@wispa.org>
*Sent:* Monday, January 16, 2006 5:14 AM
*Subject:* RE: [WISPA] Multiple Radios on Single antenna
Radios are WRAP/CM9's with StarOS on RadioWaves SPD2-5.2NS. Is there
anything special you do/use to get this to work? Only things I can
see that
would help are band pass filters.
-----Original Message-----
From: [EMAIL PROTECTED]
<mailto:[EMAIL PROTECTED]>
[mailto:[EMAIL PROTECTED] On
Behalf Of Bob Moldashel
Sent: 15 January 2006 23:53
To: WISPA General List
Subject: Re: [WISPA] Multiple Radios on Single antenna
I should revise that to say we do it on dual polarity antennas.
Not 2
radios on one antenna....
-B-
--
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
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