http://www.wku.edu/ksgc/sats.pdf Here is a link to a very clear and detailed tutorial on using LEO satellites with minimal equipment. This is the clearest explanation I've seen. The author is Richard Hackney, N1ASA Professor of Physics and Astronomy, Western Kentucky University Director, NASA Kentucky Space Grant Consortium
This is great stuff and would be a good link (or download) to add to the AMSAT webpage for newbies (like me!)
Robert WB5PKN
Hi Robert
http://www.wku.edu/ksgc/sats.pdf
This is great stuff and would be a good link (or download) to add to the AMSAT webpage for newbies (like me!)
I agree it is especially clear and well written. My only caveat is that I personally feel that the rejection of full duplex capability in the paper promotes blind transmission for longer periods than necessary creating QRM for others. Thinking back to when I cut my teeth, I would have found it particularly frustrating not knowing if I was making it.
Just my opinion, and the author is to be applauded for his efforts.
73, Howard G6LVB
At 06:54 PM 3/18/2007, Howard Long wrote:
Hi Robert
http://www.wku.edu/ksgc/sats.pdf
This is great stuff and would be a good link (or download) to add to the AMSAT webpage for newbies (like me!)
I agree it is especially clear and well written. My only caveat is that I personally feel that the rejection of full duplex capability in the paper promotes blind transmission for longer periods than necessary creating QRM for others. Thinking back to when I cut my teeth, I would have found it particularly frustrating not knowing if I was making it.
I agree totally. While it is possible to work without full duplex, it is much easier and more efficient if you have this capability. I use full duplex in a number of ways:
To ensure I'm not creating QRM (someone of similar strength may key up at the same time). Because of the quiet conditions here, this can also be used to prioritise traffic. If in a late night ragchew style (remember, it's not uncommon to be talking to yourself down here!) QSO you hear a heterodyne, you can let the other station use the satellite and use it much sooner.
To enable continuous antenna adjustment - conditions can change rapidly, and an antenna tweak is sometimes needed. It takes a bit of practice to be able to talk and adjust the antenna at the same time. My signal often has a characteristic where it rapidly becomes stronger in the first second or two, as that adjustment is made. This alone is worth a small amplifier (and much lighter!).
And as you say, simply to know if you made it.
Just my opinion, and the author is to be applauded for his efforts.
Yes, the rest of the article is well written, and lots of good photos and diagrams to aid his explanations.
73 de VK3JED http://vkradio.com
I personally won't recommend this article to new satellite users. The authors dismissal of 'full duplex' operation will only increase interference on the FM LEO satellites.
Steve .. AI7W lm #2290
-----Original Message----- From: [email protected] [mailto:[email protected]]On Behalf Of Robert C. Rice Sent: Sunday, March 18, 2007 02:04 UTC To: AMSAT-BB Subject: [amsat-bb] LEO tutorial
http://www.wku.edu/ksgc/sats.pdf Here is a link to a very clear and detailed tutorial on using LEO satellites with minimal equipment. This is the clearest explanation I've seen. The author is Richard Hackney, N1ASA Professor of Physics and Astronomy, Western Kentucky University Director, NASA Kentucky Space Grant Consortium
This is great stuff and would be a good link (or download) to add to the AMSAT webpage for newbies (like me!)
Robert WB5PKN
_______________________________________________ Sent via [email protected]. 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
I wouldn't go so far as to not recommend it.... there is a wealth of good information there. I would go ahead and recommend it with Howard's caveat: full-duplex operation is the preferred, less frustrating, and MUCH more effective method.
George, KA3HSW
----- Original Message ----- From: "Steve" [email protected] To: "'AMSAT-BB'" [email protected] Sent: Sunday, March 18, 2007 11:10 AM Subject: [amsat-bb] Re: LEO tutorial
I personally won't recommend this article to new satellite users. The authors dismissal of 'full duplex' operation will only increase interference on the FM LEO satellites.
Steve .. AI7W lm #2290
Yes, the basic article is well written. Could we perhaps contact:
Richard Hackney, N1ASA Professor of Physics and Astronomy, Western Kentucky University Director, NASA Kentucky Space Grant Consortium
and suggest modifying his article to include information on using full duplex? If he were to understand that his article would reach wide readership as a tutorial for beginning satellite users ...well, he might be quite responsive to making these changes.
If he is not so disposed to writing it, then inform him that an appendix would like to be attached addressing duplex operation.
just my thoughts on this 73 Ed - KL7UW
At 10:48 AM 3/18/2007, George Henry wrote:
I wouldn't go so far as to not recommend it.... there is a wealth of good information there. I would go ahead and recommend it with Howard's caveat: full-duplex operation is the preferred, less frustrating, and MUCH more effective method.
George, KA3HSW
----- Original Message ----- From: "Steve" [email protected] To: "'AMSAT-BB'" [email protected] Sent: Sunday, March 18, 2007 11:10 AM Subject: [amsat-bb] Re: LEO tutorial
I personally won't recommend this article to new satellite users. The authors dismissal of 'full duplex' operation will only increase interference on the FM LEO satellites.
Steve .. AI7W lm #2290
Sent via [email protected]. 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
73, Ed - KL7UW ====================================== BP40IQ 50-MHz - 10-GHz www.kl7uw.com 144-EME: FT-847, mgf-1801, 4x-xpol-20, 185w DUBUS Magazine USA Rep [email protected] ======================================
participants (6)
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Edward Cole -
George Henry -
Howard Long -
Robert C. Rice -
Steve -
Tony Langdon