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