@Kevin Brown wrote:Sriram,
Yes, I do understand that when using two radios on a single channel one must be set to front and the other back. I don't think that ABABAB was a mistake in the document. I think the author very clearly intended to illustrate a 6-sector 2-channel deployment as the diagram shows two channels each being used three times, and there is a footnote mentioning that antennas with greater than -30 dB of loss at 90-degrees are needed. From what I have been able to find, none of Cambium's sector antennas meet that side lobe specification, so its mention can't be an accident. Such a side lobe requirement would not be necessary in an ABCABC scenario where the two sectors sharing the same channel would be oriented 180 degrees away from each other.
Kevin
Hey Kevin, I assume you're talking about this image on the last page?
As you surmised, there's no way to specify a front or back sector in this ABABAB configuration. I'm almost 100% certain the author made a mistake and intended to use an 'ABCABC' configuration, which would make much more sense and allow for the front or back setting to be applied properly. Additionally, in this ABCABC configuration, one would need 3rd party antennas (Cambium doesn't have an ePMP OEM sector antenna less than 90deg, but one could possibly use a PMP450 60deg antenna with RF adapters) with excellent F/B ratios and a reduction in horizontal beam width to 60deg or even 45deg to help decrease side-lobe gain. Here's what I believe the author inteded to publish:
