[Ground-station] Gateway update + Gateway orbit modeling

[KENT BRITAIN]

 A simple look-up table in the elevation calculation should do it.
For 0-10 deg  Assume the moon is 1 deg lower than it really is.
For 10-40 deg  Assume the moon is .5 deg lower than it really is.
40+ deg   Use the calculated position.
Errors should be within the normal beamwidth unless you live at a 
very high elevation.



    On Monday, March 23, 2020, 4:13:34 PM CDT, Michelle Thompson <mountain.michelle at gmail.com> wrote:  
 
 Stratospheric... atmospheric... ionospheric... anodes... cathodes... electrodes... overloads.... generators.... oscillators....

it all starts to run together.  :+)

This technique is good to know in case we need to bring it to heel.

I'm not afraid of the work. We just need to know what must be done. 

-Michelle W5NYV



On Mon, Mar 23, 2020 at 2:02 PM KENT BRITAIN <wa5vjb at flash.net> wrote:

 Woops, the speal cheeker program got me.    Atmospheric Bending


    On Monday, March 23, 2020, 4:00:46 PM CDT, KENT BRITAIN via Ground-Station <ground-station at lists.openresearch.institute> wrote:  
 
  Good info, I have seen 1.5 deg difference between the Calculated/Optical position ofthe moon and the Radio moon.   The problem is stratospheric bending.I once asked Tom W3IWI how they dealt with this on the big dishes."We track 4 Quasars Horizon to Horizon then do lease squares best fit.  Our tracking programs also allow for Barometric Pressure, Air Temp, and Humidity"
For a 6 footer, this bending should be a non issue above 40 deg or so.
Kent



    On Monday, March 23, 2020, 3:51:30 PM CDT, Michelle Thompson <mountain.michelle at gmail.com> wrote:  
 
 We baseline a 2m dish for the JAMSAT/ORI effort. 

I assume this will be about 45dB of gain with the usual dish efficiency losses, and will give a 1 degree 3dB beamwidth.

-Michelle W5NYV




On Mon, Mar 23, 2020 at 1:17 PM KENT BRITAIN via Ground-Station <ground-station at lists.openresearch.institute> wrote:

Back to my original question, what gain are you designing around for theground station antenna?  



  
  
    
  
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