A post in 2016 noted that the EIRP limit for the B5c in the US was still +36 dBm. But that’s not the actual rule. EIRP limits for PtP are in practice largely based on two things. One is the out-of-band emissions (OOBE), which are pretty strict, especially on U-NII-1. The other is the way it is type approved. Which leads to my question…
A certain other well-known radio vendor came out with a new point to point model last year that looks at first glance like it’s aimed squarely at the B5 line. It is 802.11ac wave 2, two frequencies, priced not unlike Mimosa. BUT that vendor also sells FPGA PtP radios for about ten times that price. So when they did the US type approval, they specified a +23 dBm antenna gain. An obscure feature of US rules is that you can use a Part 15 radio with the specified antenna or one of similar type (panel, dish, etc.) and the same or lower gain. Test with a 30 dB dish and the user can pick any other 30 dB or 25 dB or whatever dish, but not a 34 dB dish. Said vendor type approved the new PtP radio with only a 23 dB antenna, and is quite smug about its not being allowed with a higher gain antenna. Nice for short hops, I suppose.
Since I’m currently looking to push a lot of bits for a lot of distance (up to 18 km) in a rural mountain area, I need lots of EIRP. So [deleted ;-)] that other new radio, and back to Mimosa. The B5c with a 2’ dish looks like a nice option. The rules do not specify any EIRP limit in the 5725-5850 range; it’s just limited by OOBE or the type approval.
So what would be the highest EIRP, and biggest dish, I’d be allowed to use on U-NII-3 with a B5c? It wasn’t totally obvious in the FCC test reports. Also, what would it be on U-NII-1 (where the nominal limit of +53 is hard to achieve due to OOBE)? Thanks.