At 9/14/2010 01:56 AM, Robert West wrote: >You be right! I have one hub with multiple backhauls on it. My problem was >always the sectors being 15 to 19dbi gain but the grids being a good 29. My >furthest out is 20 miles, not good for a 15dbi sector, but most other AP's >can see the hub's sectors at at least a -74. In fact, I've USED them in a >pinch to work around outages, though not within FCC guide lines.......... >(So what) but I never thought about just using it as part of the big >vision. > >Hmmmmmmmmmmmmmmmmm................
Yeah, that's the tough part. The longest path from that sector is 22 kilometers. RadioMobile estimates a path loss of around 137 dB, but it's over water so it could vary widely. So if the sector is legally PtMP, then I have a 17 dB sector and can feed it only +19, for +36 EIRP. The remote end, though, is PtP so I can use a 24 dB antenna and a +24 radio, for a +48 EIRP. My outbound fade margin would be nicer if I could call the sector PtP too! That's why the SkyPilot rule is interesting. They use a 45 degree sector and a +27 TDMA transmitter and call it PtP, with +44 or more EIRP, even though it looks PtMP to the end user. Clever rule hacking, but they've gotten approved. So why shouldn't Airmax or NV2 do the same? -- Fred Goldstein k1io fgoldstein "at" ionary.com ionary Consulting http://www.ionary.com/ +1 617 795 2701 -------------------------------------------------------------------------------- WISPA Wants You! Join today! http://signup.wispa.org/ -------------------------------------------------------------------------------- WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/
