[amsat-bb] Re: Delfi C-3 tracking an keplerian elements
ve9qrp at gmail.com
Mon Apr 28 16:17:54 PDT 2008
On Mon, Apr 28, 2008 at 7:08 PM, Jens Kirsten <jens_kirsten at yahoo.de> wrote:
> Hi Dave,
> for satellite tracking I use "orbitron". It's easy to use and freeware.
> You can find it here: http://www.stoff.pl/
> The Keplerian elements needed for tracking can be found on the Delfi C-3
> web page:
> Simply copy and paste the 2-line format in a txt-file and save this file
> as *.txt. This txt-file can then be loaded into the satellite tracking
> program, for example "orbitron".
> Don't worry about Az/El rotor. I could receive almost every cubesat on
> VHF with my general groundplane antenna. Even with my HT TH-F7E
> reception in the field is possible.
> You can also download the RASCAL telemetry decoding software from the
> Delfi C-3 page. See here:
> Best 73! from JO40ja
> Jens - DL2FJK
I would add to Jen's helpful comments that your antenna choice
decisions are somewhat different when dealing with satellites. A
high-gain omni antenna for terrestrial use gets its gain by keeping
the radiation angle low. For a satellite, though, that means that you
will receive poorly above, say, 15 degrees, and that might be the part
of the pass where your omni antenna would otherwise have a fighting
All to say that a crummy 1/4 wave groundplane might work better than
the jpole, especially if you can tilt the vertical element over a bit
to reduce the null overhead.
This is truly an experimental branch of the hobby: each bird has its
different characteristics, and antenna design is great fun. Have as
many different options at hand as you can and see what works best for
> D. Mynatt wrote:
> > Group,
> > I'm new to this and a local ham has agreed to help me build a 'J'-type
> > antenna matched to 145.930Mhz to track Delfi. I won't have a Az/El
> > rotor setup, but my apt is the highest in the city (ain't saying much
> > about CO, huh?) and I'm hoping that's enough as the antenna is good on
> > the sides but not on the overhead, as I understand him to say.
> > Any way, so I don't appear toooooo stupid can you tell me what
> > application I'd use to know where this bird is at, when. How does the
> > Keps for Delfi get into the app. Is everyone using SatPC ?
> > Thanks for taking time outta this exciting moment,
> > Dave (KA0SWT)
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