[aprssig] PSAT digipeater is ON

Lynn W. Deffenbaugh (Mr) ldeffenb at homeside.to
Tue Jun 2 15:11:55 CDT 2015


Send an APRS message to SAT99993 with any body content.  This is a pass 
predictor based on Bob's published TLE from a while ago.  It is probably 
off by up to an hour now, but it'd be better than nothing.  I'll keep it 
current with each TLE that comes from Bob.

Lynn (D) - KJ4ERJ - Author of APRSISCE for Windows Mobile and Win32

PS.  See also: http://aprsisce.wikidot.com/doc:satsrv

On 6/2/2015 3:39 PM, Paul Bramscher via aprssig wrote:
> I use GPredict, which leans on celestrak for TLE's.  I don't think I 
> can/should manually enter TLE's into that program.  They might get 
> wiped out with the next network TLE refresh -- or go stale otherwise.  
> If the PSAT TLE's aren't yet part of the celestrak feed, is there a 
> web site out there (e.g. ariss.net, aprs.fi, etc.) providing PSAT 
> tracking?  Would also be nice to see some web-based tracking 
> integration with openstreetmap.org -- it's becoming quite polished 
> lately.  If time permitted, I'd tinker with that myself.
>
> My igates don't yet run 24x7, but I'd like to see whether my setups 
> can hear it for passes when I'm able to tinker in the shack.
>
> 73, KD0KZE / Paul
>
> ------------------------------------------------------------------------
> *From: *"Nagi Punyamurthula via aprssig" <aprssig at tapr.org>
> *To: *"Stephen H. Smith" <wa8lmf2 at aol.com>, "TAPR APRS Mailing List" 
> <aprssig at tapr.org>, "Robert Bruninga" <bruninga at usna.edu>
> *Sent: *Tuesday, June 2, 2015 12:53:06 PM
> *Subject: *Re: [aprssig] PSAT digipeater is ON
>
> I'm trying to track the orbit for PSAT using celestrak TLE however, 
> can't seem to find him there.  Can someone share where one can find 
> the TLE for PSAT
> www.celestrak.com/NORAD/elements/amateur.txt
>
> this is a fantastic milestone in the APRS technology wave; Congrats to 
> Bob, et al involved in landing this project.
>
> Thanks
>
> 73, N0AGI, Nagi
> http://N0AGI.com/
> http://aprs.fi/info/N0AGI
>
>
> -----Original Message-----
> From: aprssig [mailto:aprssig-bounces at tapr.org] On Behalf Of Stephen 
> H. Smith via aprssig
> Sent: Tuesday, June 02, 2015 12:06 PM
> To: Robert Bruninga; TAPR APRS Mailing List
> Subject: Re: [aprssig] PSAT digipeater is ON
>
> On 6/2/2015 9:38 AM, Robert Bruninga via aprssig wrote:
> > APRS activists:
> >
>
> > I don’t expect anyone to wear out their rotators tracking PSAT, no,
> > just a simple vertical over a ground plane will do.  Either a 19”
> > vertical whip over a large 6 foot square ground plane or even better,
> > a 58” vertical monopole over the ground plane.  This ¾ wavelength
> > vertical has almost 7 dBi gain and will pick up signals during the 
> few minutes overhead.
>
>
> I currently have an Icom AH-7000 discone monitoring 145.825 for the 
> ISS digipeter running 24/7.
>
> Go to <http://WA8LMF.net/map> and follow the links there.
>
> It appears to be not very effective for high-elevation RX.   I assume the
> discone has more of a vertical dipole-like pattern that favors the 
> horizon rather than over head, perhaps with slightly fatter lobes than 
> a normal vertical dipole.  As I often say, it's equally poor at all 
> frequencies from
> 50-1000 MHz.....
>
> I assume the 3/4-wave vertical, over an adequate ground plane, would 
> have multiple lobes with one up-tilted substantially, and would favor 
> high-angle RX better than the discone.  Albeit with still a null at at 
> or near the zenith.
>
> Any sense how the 3/4-wave compares with the discone?
>
> I am considering building a Lindenblad antenna (four 1/2-wave dipoles 
> arranged in a horizontal square with each one tilted about 30 degrees 
> from horizontal) that supposedly creates a nearly hemispherical 
> pattern that is circularly polarized at the zenith. Apparently the FAA 
> uses these to communicate with aircraft anywhere from the horizon to 
> directly overhead.
>
> Anyone have experience with the Lindenblad for satellite downlinks on 
> 2M?   How
> does it compare with the other two above?
>
> ___________________________________
>
> Stephen H. Smith    wa8lmf (at) aol.com
> Skype:        WA8LMF
> EchoLink:  Node #  14400  [Think bottom of the 2-meter band]
> Home Page:          http://wa8lmf.net
>
> Live Off-The-Air APRS Activity Maps
>     <http://wa8lmf.net/map>
>
> Long-Range APRS on 30 Meters HF
>     <http://wa8lmf.net/aprs/HF_APRS_Notes.htm>
>
>
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