Bob,
You might be interesting in this computerized version:
http://www.tomdoyle.org/OscarLocator/OscarLocator.html
Neat, and kind of reminds me of the mythical microprocessor driven slide rule we joked about in graduate school. ca 1975.
73s,
Alan WA4SCA
<-----Original Message----- <From: AMSAT-BB [mailto:[email protected]] On Behalf Of Robert Bruninga <Sent: Friday, May 27, 2016 9:10 AM <To: amsat bb [email protected] <Subject: Re: [amsat-bb] Fw: HF-HF satellite (OSCAR LOCATOR?) < <> 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 <_______________________________________________ <Sent via [email protected]. AMSAT-NA makes this open forum available <to all interested persons worldwide without requiring membership. Opinions expressed <are solely those of the author, and do not reflect the official views of AMSAT-NA. <Not an AMSAT-NA member? Join now to support the amateur satellite program! <Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb