[aprssig] PSAT digipeater is ON

Nagi Punyamurthula n0agi at n0agi.com
Tue Jun 2 18:37:42 CDT 2015

I use Predict and have a crontab to pull the latest TLE from celestrak everyday at 2am. It works great to keep up w/ the latest TLEs.  I have a separate linux app (testing now) that launches the APRX software upon pass thru AOS of ISS to do its sGate + RF Bacon procedures and then shuts it down after the pass through LOS

I would be looking at replicating similar behavior for PSAT pass throughs, although, the celestrak does not (yet) contain a TLE for PSAT.

Hence the ask for a readily available TLE data for PSAT in celestrak or other source

From: aprssig [mailto:aprssig-bounces at tapr.org] On Behalf Of Paul Bramscher via aprssig
Sent: Tuesday, June 02, 2015 2:40 PM
To: TAPR APRS Mailing List
Subject: Re: [aprssig] PSAT digipeater is ON

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<mailto:aprssig at tapr.org>>
To: "Stephen H. Smith" <wa8lmf2 at aol.com<mailto:wa8lmf2 at aol.com>>, "TAPR APRS Mailing List" <aprssig at tapr.org<mailto:aprssig at tapr.org>>, "Robert Bruninga" <bruninga at usna.edu<mailto: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

this is a fantastic milestone in the APRS technology wave; Congrats to Bob, et al involved in landing this project.


73, N0AGI, Nagi

-----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

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