[Date Prev][Date Next][Thread Prev][Thread Next] - [Date Index][Thread Index][Author Index]

Re: Delfi C3 first orbit



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@gmail.com>
To: "Rick Mann" <rmann@latencyzero.com>
Cc: <amsat-bb@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
> launch!
>
> 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, +/-
>> Doppler
>>
>> I also have a Kantronics PacketCommunicator 3 Plus. Can someone tell
>> me how to configure it to decode the telemetry and produce a .kss
>> file?
>>
>> Thank you!
>>
>> -- 
>> Rick
>>
>> _______________________________________________
>> Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the
>> author.
>> Not an AMSAT-NA member? Join now to support the amateur satellite
>> program!
>> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
>
> _______________________________________________
> Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb 

_______________________________________________
Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author.
Not an AMSAT-NA member? Join now to support the amateur satellite program!
Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb



AMSAT Top AMSAT Home