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<blockquote data-quote="Vipersan" data-source="post: 976207" data-attributes="member: 325666"><p>According to Dishpointer</p><p>True Elevation For Inmarsat 3-F2 = 27.7 from my location.</p><p>This being the Elevation IF this bird was not inclined ..</p><p>So I'm going to watch the changes over a 12 hour period.</p><p></p><p></p><p>Starting at noon</p><p>I have the antenna on a 1.1m offset dish (homebrew lnb arm) ...so the size will of course employ a narrow-ish beam and since I cannot track 3-F2 I want to find the mid point and using a relatively narrow beam I am expecting dropout of signal and changes over the period of oscillation above and below the equatorial plane .</p><p>Particularly since the installation was set up at a time of day unknown in relation to this oscillation.</p><p>Frequency monitored 1.546064 ghz</p><p></p><p>My first measurement at :-</p><p>12:00 Noon local time , Elevation indicated by N2YO = +27 , Signal level = 9db approx - nominal decoding of data - occasional errors - quadrature constellation in and out of lock but mostly locked.</p><p></p><p>01:00 PM - N2YO (Inmar 3-F2 = +27.5 ) ,Signal level = 8db approx , nominal decoding of data - occasional errors - quadrature constellation in and out of lock but mostly locked</p><p></p><p>02:00 PM - N2YO (Inmar 3-F2 = +28.0 ) ,Signal level = 7db approx , nominal decoding of data - occasional errors - quadrature constellation in and out of lock but mostly locked</p><p></p><p>02:15 PM - N2YO (Inmar 3-F2 = +28.2 ) ,Signal level = 6db approx , nominal decoding of data - occasional errors - quadrature constellation in and out of lock but mostly locked</p><p>Signal levels appear to be climbing ?</p><p></p><p>02:30 PM - N2YO (Inmar 3-F2 = +28.3 ) ,Signal level = 8db approx , nominal decoding of data - no observable errors - quadrature constellation solid lock</p><p>Signal levels appear to be climbing rapidly ?</p><p></p><p>Maybe the laterall movement is playing a part now ...as 3-F2 is close to maximum Elevation cycle ? according to N2YO</p><p></p><p>Time 2:40 PM ..and the signal level just dropped a dramatic amount from 8db to just over 5db ??</p><p>back to occasional unlock of quadrature constellation and occasional data errors..?</p><p>looks like the power levels from the bird are changing ...atmospherics? or being controlled ?</p><p>Elevation +28.4</p><p></p><p>Local time 2:45 PM ...</p><p>Signal just reurned to approx 8db rapidly from about 5db ...and still climbing ?</p><p>N2YO +28.4</p><p></p><p></p><p></p><p>03:00 PM - N2YO (Inmar 3-F2 = +28.6 ) ,Signal level = 6db approx , nominal decoding of data - very occasional errors - quadrature constellation in and out of lock but mostly locked</p><p>Signal having dropped back from a max of 8db rapidly during this confusing period. ?</p><p></p><p>I'm beginning to wonder if N2YO have accurate calculated positional data ?</p><p>Time now 3:10 ...and am seeing the strongest signal level since noon at 10db</p><p>N2YO still showing Elevation of +28.6</p><p></p><p>03:30 PM - N2YO (Inmar 3-F2 = +28.8 ) ,Signal level = 9db approx , nominal decoding of data - no observable errors - quadrature constellation solid lock ...and as ususual ...just add confusian...it started raining albeit light drizzle atm..</p><p></p><p>04:00 PM - N2YO (Inmar 3-F2 = +29.0 ) ,Signal level = 8.5db approx , nominal decoding of data - very occasional errors - quadrature constellation mostly solid lock - rain a bit more intense</p><p></p><p>Rain coming down quite heavy now ...</p><p>Still maintaining good signal level and data lock for the most part ..</p><p>If nothing else this will test how well I have sealed the antenna from the weather ..</p><p>fingers crossed..</p><p></p><p>04:30 PM - N2YO (Inmar 3-F2 = +29.2 ) ,Signal level = 6.5db approx , nominal decoding of data - very occasional errors - quadrature constellation mostly solid lock - rain fairly heavy now</p><p></p><p>05:15 PM - N2YO (Inmar 3-F2 = +29.4 ) ,Signal level = 6.0db approx , nominal decoding of data - very occasional errors - quadrature constellation mostly solid lock - rain almost stopped but dish very wet</p><p></p><p>07:10 PM - N2YO (Inmar 3-F2 = +29.8 ) ,Signal level = 6.0db approx ,</p><p></p><p>Approx 7:30PM 3-F2 began its descent below the equatorial plane ...</p><p>since I have a lot of upward travel data ...I wont check it as often until it gets below the noon start point ..</p><p>ie approx midnight ..?</p><p></p><p>currently :-</p><p></p><p>08:10 PM - N2YO (Inmar 3-F2 = +29.7 ) ,Signal level = 7.5db approx</p></blockquote><p></p>
[QUOTE="Vipersan, post: 976207, member: 325666"] According to Dishpointer True Elevation For Inmarsat 3-F2 = 27.7 from my location. This being the Elevation IF this bird was not inclined .. So I'm going to watch the changes over a 12 hour period. Starting at noon I have the antenna on a 1.1m offset dish (homebrew lnb arm) ...so the size will of course employ a narrow-ish beam and since I cannot track 3-F2 I want to find the mid point and using a relatively narrow beam I am expecting dropout of signal and changes over the period of oscillation above and below the equatorial plane . Particularly since the installation was set up at a time of day unknown in relation to this oscillation. Frequency monitored 1.546064 ghz My first measurement at :- 12:00 Noon local time , Elevation indicated by N2YO = +27 , Signal level = 9db approx - nominal decoding of data - occasional errors - quadrature constellation in and out of lock but mostly locked. 01:00 PM - N2YO (Inmar 3-F2 = +27.5 ) ,Signal level = 8db approx , nominal decoding of data - occasional errors - quadrature constellation in and out of lock but mostly locked 02:00 PM - N2YO (Inmar 3-F2 = +28.0 ) ,Signal level = 7db approx , nominal decoding of data - occasional errors - quadrature constellation in and out of lock but mostly locked 02:15 PM - N2YO (Inmar 3-F2 = +28.2 ) ,Signal level = 6db approx , nominal decoding of data - occasional errors - quadrature constellation in and out of lock but mostly locked Signal levels appear to be climbing ? 02:30 PM - N2YO (Inmar 3-F2 = +28.3 ) ,Signal level = 8db approx , nominal decoding of data - no observable errors - quadrature constellation solid lock Signal levels appear to be climbing rapidly ? Maybe the laterall movement is playing a part now ...as 3-F2 is close to maximum Elevation cycle ? according to N2YO Time 2:40 PM ..and the signal level just dropped a dramatic amount from 8db to just over 5db ?? back to occasional unlock of quadrature constellation and occasional data errors..? looks like the power levels from the bird are changing ...atmospherics? or being controlled ? Elevation +28.4 Local time 2:45 PM ... Signal just reurned to approx 8db rapidly from about 5db ...and still climbing ? N2YO +28.4 03:00 PM - N2YO (Inmar 3-F2 = +28.6 ) ,Signal level = 6db approx , nominal decoding of data - very occasional errors - quadrature constellation in and out of lock but mostly locked Signal having dropped back from a max of 8db rapidly during this confusing period. ? I'm beginning to wonder if N2YO have accurate calculated positional data ? Time now 3:10 ...and am seeing the strongest signal level since noon at 10db N2YO still showing Elevation of +28.6 03:30 PM - N2YO (Inmar 3-F2 = +28.8 ) ,Signal level = 9db approx , nominal decoding of data - no observable errors - quadrature constellation solid lock ...and as ususual ...just add confusian...it started raining albeit light drizzle atm.. 04:00 PM - N2YO (Inmar 3-F2 = +29.0 ) ,Signal level = 8.5db approx , nominal decoding of data - very occasional errors - quadrature constellation mostly solid lock - rain a bit more intense Rain coming down quite heavy now ... Still maintaining good signal level and data lock for the most part .. If nothing else this will test how well I have sealed the antenna from the weather .. fingers crossed.. 04:30 PM - N2YO (Inmar 3-F2 = +29.2 ) ,Signal level = 6.5db approx , nominal decoding of data - very occasional errors - quadrature constellation mostly solid lock - rain fairly heavy now 05:15 PM - N2YO (Inmar 3-F2 = +29.4 ) ,Signal level = 6.0db approx , nominal decoding of data - very occasional errors - quadrature constellation mostly solid lock - rain almost stopped but dish very wet 07:10 PM - N2YO (Inmar 3-F2 = +29.8 ) ,Signal level = 6.0db approx , Approx 7:30PM 3-F2 began its descent below the equatorial plane ... since I have a lot of upward travel data ...I wont check it as often until it gets below the noon start point .. ie approx midnight ..? currently :- 08:10 PM - N2YO (Inmar 3-F2 = +29.7 ) ,Signal level = 7.5db approx [/QUOTE]
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