[amsat-bb] Re: Delfi C3 first orbit
glasbrenner at mindspring.com
Sun Apr 27 17:49:32 PDT 2008
Let me suggest that for the first couple of orbits you forego the automatic
Doppler tuning and just tune the +/- 3 kHz by hand. You'll have a much
greater possibility of success. Frequencies may not be stable or exactly as
published, and keplerian elements are an educated guess at this stage.
Predictive Doppler tuning is a recipe for failure until those parameters
stabilize. On the other hand, if you have a TNC or program with Costas loop
tuning for the 1200 baud BPSK, you are a step ahead.
Just a bit of advice, take it or leave it.
73, Drew KO4MA
----- Original Message -----
From: "Mark Vandewettering" <mvandewettering at gmail.com>
To: "Rick Mann" <rmann at latencyzero.com>
Cc: <amsat-bb at amsat.org>
Sent: Sunday, April 27, 2008 6:03 PM
Subject: [amsat-bb] Re: Delfi C3 first orbit
> On Apr 27, 2008, at 12:21 PM, Rick Mann wrote:
>> On Apr 27, 2008, at 2:24 AM, Wouter Jan Ubbels wrote:
>>> Indeed, Delfi-C3 will first exit eclipse over the US at 0501 UTC and
>>> this is
>> I am in the San Francisco, CA Bay Area. I have a Mac, and am not yet
>> able to use RASCAL, but I can make a recording of the pass starting at
>> 0455 UTC tonight. I would very much like to contribute.
> Me too!
> 1. Bay Area: check!
> 2. Mac: check!
> 3. Recording: check!
> I got RASCAL working on one of my Linux boxes, but not the Mac. My
> idea is that I am going to record the pass using my Macbook, and then
> play it back later and see if I can get it to decode with RASCAL.
> Using my FT-817 and a simple Doppler correcting control script that
> I wrote using my Python satellite library, I hope that the TLE's
> they have will be good enough to find the signal. I'll post here if
> I succeed. Best wishes to all the cubesat developers for a good
> Mark (KF6KYI)
>> I want to be sure I set things up correctly. Please confirm that I
>> should do the following:
>> Set radio to USB mode.
>> Tune to 145.870 MHz - 0.0016 MHz = 145.8684 MHz, +/- Doppler
>> if no signal found on that, tune to 145.930 - 0.0016 = 145.9284, +/-
>> I also have a Kantronics PacketCommunicator 3 Plus. Can someone tell
>> me how to configure it to decode the telemetry and produce a .kss
>> Thank you!
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