Link Planner offers users limits for 5.4 Ghz. In the US where the scenario is ISP to Federal Customer at a County Airport, I am assuming the rules would be the same as any other location right now. But I need to looks like I would need to put in user limit information to have prediction modeling done for both ends for Max Power and Maximum EIRP. What would those need to be to be consistent with any in practice algorithms used with 450b High Gain units on each end, and what other factors would affect that? Also, if I use a 450 AP on one end and a 450b High Gain on the other, does the current BETA release notes read that that might hinder my performance more than currently released not BETA versions on a PTP scenario or was that just concerning the scenario where a standard 450 AP was used instead of referring to use of a 450i or newer AP with standard 450 SM units?
I just tried modeling a PtP 450b 5.4 DFS link and it appears that it sets the TX power and EIRP correctly. No need for any manual user input. Any Cambium radios with an integrated dish set to the United States region are going to have their antenna gain fixed and the EIRP will adhere to the band being used, so there’s no way for you to increase the power beyond the allowed EIRP. The only way to do that would be to use connectorized radios and fudge the antenna gain field.
Cambium has a good KB article regarding PMP450 and 5.4 here you can reference:
Hi,
As Eric mentioned, we do account for DFS in the power/EIRP limits and reduce the values and limits that are shown in LINKPlanner accordingly. This is one of the reasons why LINKPlanner can sometimes show lower max power/EIRP values than the product specification.
We don’t directly account for weather radar stations, which are located near to certain airports, but you will see a large warning in LINKPlanner if you need to allow for this when selecting a frequency:
Thanks,
Andy
The default values I was seeing not matching the ones Eric showed were probably just because I hadn’t hit apply enough times and now they match. This is preliminary planning but I’ll read again these documents and look for the warnings mentioned too and obviously consider other frequencies and products too. It would be nice to be able to use what has often been called something like normal power output levels referring to what is done normally at least in the U.S. in 5.7 in other frequencies but we will see how things turn out. Unless I am wrong, a lot of the limitations of DFS come from allegations against a WISP in CA unless I was misinformed. I hope someone has made proper Freedom of Information requests about that situation as it seems long overdue.
Which option in the drop down list if any is a Commscope VHLP2-18-CR4C as I am evaluating 18 Ghz also?
