Not recommended for geosynchronous orbit. Need 6 dB more antenna gain... From: Chuck McCown Sent: Tuesday, February 23, 2016 4:05 PM To: [email protected] Subject: Fw: [AFMUG] Force 200 Ptp distance
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 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 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 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?
