Forum Discussion
Hughesnet HT2000W
What is the best off the shelf wireless router to buy then using Hughesnet HT2000W router? I would like to replace it with the ORBI wireless cable modem.
There’s an app now that calculates the symbols on stargates.
Here's the process if you want to figure it out:
1. Get your location and the location of your gateway (North lats are positive, West longs are negative).
Location of E19 is at lat 0, lon -97.1071, elev 35786000 m.
2. Convert all the locations from degrees to radians (e.g., φ * pi / 180).
3. Convert all three locations to a point in 3-space:
Earth's radius: Er = √( [ (6378137²*Cos(lat))² + (6356752.3²*Sin(lat))² ] / [ (6378137*Cos(lat))² + (6356752.3*Sin(lat))² ] )
Geocentric Lat: Glat = ArcTan( (1-0.00669437999014)*Tan(lat) )
Point:
x = Er*Cos(lon)*Cos(Glat) + elev*Cos(lat)*Cos(lon)
y = Er*Sin(lon)*Cos(Glat) + elev*Cos(lat)*Sin(lon)
z = Er*Sin(Glat) + elev*Sin(lat)
3. Calculate the path distances in km for each leg by taking the square root of the sum the squares of the differences in each direction and then dividing by 1000:
Dkm = √(Δx² + Δy² + Δz²) / 1000 m/km
4. Calculate the minimum lag time by dividing twice the total path by the speed of light:
Tlag(ms) = 2*(Dkm(dish to sat)+Dkm(sat to gateway)) / 299.7924 km/ms
Turns out the lag for me in C.Virginia to E-19, and San Diego and back is 500.54ms.
Eek! It looks like Greek, to me. I'll just stick with my guesses. :)
GabeU wrote:Eek! It looks like Greek, to me. I'll just stick with my guesses. :)
Or you could just use this site: http://www.cosinekitty.com/compass.html
MarkJFine wrote:
GabeU wrote:Eek! It looks like Greek, to me. I'll just stick with my guesses. :)
Or you could just use this site: http://www.cosinekitty.com/compass.html
Good site. Thanks!
Sat to home = 23,585 miles = 0.127 seconds x 2 = .254 seconds.
Sat to gateway = 23,794 miles = 0.128 seconds x 2 = .256 seconds.
So, the latency for me that is due solely to distance is .510 seconds.
What's neat about that site is that it gives full sighting: azimuth and take off angle.
