I see now, I was confused where the 158 was coming from... but the Force 200 spec sheet says the antenna is 25dBi and trasmit power is up to 30dBm... so, shouldn't that get us 173?
On Tue, Feb 23, 2016 at 5:04 PM, Chuck McCown <[email protected]> wrote: > 22 dBm transmit power with a 23 dBi integrated antenna == 45 dBm EIRP > RX sensitivity, adaptive = –93 dBm. > To me that would be a system gain of only 138 dB. > Oh, but you have to add the RX antenna, so another 23 dBi and you get 158 > dB. > > There ya have it. > > *From:* Chuck McCown <[email protected]> > *Sent:* Tuesday, February 23, 2016 4:01 PM > *To:* [email protected] > *Subject:* Re: [AFMUG] Force 200 Ptp distance > > If you max out the EIRP and go for minimum usable RX signal level, Cambium > says that difference is 158 dB. > (system gain) > > The rest is a free space path loss formula run backwards. > > *From:* Craig House <[email protected]> > *Sent:* Tuesday, February 23, 2016 3:58 PM > *To:* [email protected] > *Subject:* Re: [AFMUG] Force 200 Ptp distance > > I understood it perfectly. Up to the period after sheet . It got a bit > fuzzy after that. > Craig > > > ------------------------------ > *From: *"Mathew Howard" <[email protected]> > *To: *"af" <[email protected]> > *Sent: *Tuesday, February 23, 2016 4:57:33 PM > *Subject: *Re: [AFMUG] Force 200 Ptp distance > > Your math confuses me... > > On Tue, Feb 23, 2016 at 4:52 PM, Chuck McCown <[email protected]> wrote: > >> 158 dB using 23 dBi integrated antenna according to the spec sheet. >> >> 158=20 log D + 20 log 5800 >> 7.9=log D +3.76 >> 4.14=log D >> >> 10 to the 4.14 power = 13,804 miles >> >> *From:* Joseph Marsh <[email protected]> >> *Sent:* Tuesday, February 23, 2016 3:45 PM >> *To:* [email protected] >> *Subject:* [AFMUG] Force 200 Ptp distance >> >> >> What is the max distance for a force 200 Ptp link? >> > > >
