That's okay, we're using the QPSK 1/2 receive sensitivity anyway.... On Tue, Feb 23, 2016 at 6:31 PM, Eric Kuhnke <[email protected]> wrote:
> +30 only at like QPSK 1/2 code rate modulation > On Feb 23, 2016 3:09 PM, "Mathew Howard" <[email protected]> wrote: > >> 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? >>>> >>> >>> >>> >> >>
