[amsat-bb] Re: What a shame!

Tony Langdon vk3jed at gmail.com
Sat Feb 21 13:16:30 PST 2009

At 04:30 AM 2/22/2009, Art McBride wrote:
>I think we need to use lowest frequency for the down link as 6dB of path
>loss occurs for every octave increase in frequency. 2M to 70cm = (-9dB).
>This keeps the power budget down on the space craft. It also helps hearing
>the satellite and causes O/E problems to gravitate to the up link.

Down here, your suggestion would work well.  Certainly did for SO-35, 
when it was operational.  The most common "newbie issue" I see is not 
being able to hear the downlink on U/V birds, which, combined with 
inexperience can lead to a station unknowingly jamming the 
bird.  Hearing the downlink is the single most important thing to 
achieve, and that needs to be relatively easy, compared to getting 
into the bird, to minimise QRM. :)

73 de VK3JED / VK3IRL

More information about the AMSAT-BB mailing list