H vs V Polarity?

[accidentaladmin]

We want to locate some equipment for a PTP relay midpoint (WAR board with CM9's @ 5.8) on a rooftop where there is already some other 5.8 equipment. The owner would like some assurances that we won't interfere with the present equipment, and I need to address his concerns.

If I'm using 5.8 GHz, 29 or 32.5 db parabolic dishes and/or 29 db parabolic grids, how much attenuation should I get using horizontal versus vertical polarization, or vice-versa?

Also, how much will the cloaking available with the WAR boards help here? (I am assuming they will let me know which channels they're presently using, so I can select ours accordingly.)

Thanks for your help.

[lonnie]

The V/H attenuation would be obtained from the antenna specs. Figure at least 15 dB although it could be over 20 dB.

The only way we can see the other gear is if it is standards compliant on a normal channel. You will see it in the site survey. If they are non standard then you would require a Spectrum Analyzer or just ask them.

Cloaking will work wonders if you can accept 20 mbps or less.

[accidentaladmin]

Thanks, Lonnie. I had already checked the antenna manufacturer's documentation, and didn't find the info there, so I sent them an email requesting the specifics. Maybe they'll get back to me tomorrow.

Is the 20 mbps a 2x or 4x cloaking figure? We intend to feed the head end with a DS-3 connection, and are wondering just how much we can get out at the other end. (total route = 4 hops: 1-mile, 20-miles, 10-miles, 20-miles, all radios CM9 on 533 MHz WAR boards) Any guesses?

Thanks

[lonnie]

We have a 7 hop system that delivers 20+ mbps end to end. All units are non cloaked, but we do have p2p feeds for the schools on x4 to ensure they have trouble free service and get at least 5 mbps. Signal and noise are improved by cloaking but throughput is reduced.