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[aprssig] Easy Predicting GO-32 for the mobile!

gerheim at cox.net gerheim at cox.net
Sat Oct 13 00:20:09 UTC 2007


Using a cheap 1/4 wave (half meter) GP, I finally decoded something from GO-32.  The "LIST" in the D7 filled up with 40 identical status messages from 4XTECH-12 - even the same time tag, right down to the second.  

I should be able to put up a satgate as soon as I get the registration for UIVIEW-32, and they fix the bird's s/w.  

QTH: FN41.  



---- Robert Bruninga <bruninga at usna.edu> wrote: 
> Looks like with the minimum elevation for Mobile reception of
> GO-32 being 30 degrees, this translates to usable ground tracks
> every 12 degrees of longitude which means we would need 5
> tables, one for each of these cities:
> SFO, SLC, Dallas, Chicago and Wash DC.  
> 
> These tables and timeswould not change except twice a year
> switching to/from Daylight Savings time.  For example, here is
> the WashingtonDC table (rounded to nearest 5 minutes).
> 
> Day1 Day2 Day3 Day4 Day5 Day6 Day7 Day8 Day9 Day1
> ---- ---- ---- ---- ---- ---- ---- ---- ---- ----
> 0930 0910 1025 1005 0940 0920 1040 1015 0950 0930
>      1050                1055
> 2050 2030 2005 2125 2100 2040 2015 2135 2110 2050
>      2210 2145                2155
> 
> Today is day 3.
> 
> If you lived south of DC, then your passes would be 5 minutes
> later in the morning and 5 minutes earlier in the evening.  For
> each table, the only info you need is what day you are on.  Then
> you can count forward or backward in time to predict any passes.
> 
> Remembering that for uplinks, there is an additional pass 100
> minutes before and after each of those shown as a single pass.
> 
> >> ELEVATION ANGLE:  ... is also easy to infer.  
> >> The days with double passes are near 30
> >> degrees each (barely detectible by the mobile).
> >> The days midway between these lowest peak passes 
> >> are the highest elevations (75 or more degrees).  
> >>
> >> Happy wilderness traveling!
> >>
> >> Bob, WB4APR
> 
> 
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--
-Al Gerheim

HP-49G+ Software Page:
http://members.cox.net/above





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