[amsat-bb] Fw: HF-HF satellite (OSCAR LOCATOR?)

[Ángel Peláez Martínez]

Hi Bob, 
Rather than vertical, I see a very steep orbit, near to 90deg. It resembles a straight line, but it is a curved one indeed, with time increment calibration after EQX.
I hope my explanation be useful.
Best 73.
EA4DUT, Angel

Enviado desde mi iPhone

El 27/5/2016, a las 16:09, Robert Bruninga <bruninga at usna.edu> escribió:

>> Sat tracking in the early days was with an AMSAT
>> OSCAR-LOCATOR (Rotating mylar discs over a global map!!).
> 
> I just googled and there is only one image of an OSCARLOCATOR I can find.
> I remember it well, but am confused by this image:
> http://www.amsat.org/amsat-new/tools/images/oscarlocator.jpg
> 
> I understand the curved trace.  It crosses near the pole at the latitude of
> the inclination of the orbit.  And I understand the circular plot which is
> angle and elevation from your QTH when placed over your house.  But I do
> not understand the straight line scale going nearly vertical and labeled
> RS?  WHy is there no curve to it?
> 
> And the only other one I found was this:
> http://www.studiorite.com/oldindex/images/OscarLocator1sm.jpg
> 
> Which looks like it has the orbits of three different satellites, one of
> them added on in green marker.  But this one is lacking the AZ/EL circle
> for the station.
> 
> Is there a better image anywhere that I can use to justify this "minimum
> satcom" experiment?
> 
> And is this how it worked?  You got the daily zero crossing of the
> equator.  Then for the next 24 hours you could just rotate the plastic
> overlay by the longitude increment?  ANd increment the time by the orbital
> period?
> 
> On a trip and without a smart phone, I'd rather do an OSCAR locator then
> fuss with a PC...
> 
> Bob, WB4APR
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