[amsat-bb] What influences LEO propagation?

[GEO Badger]

Hans,
What I believe you are really asking is what effects VHF/UHF propagation. Lighting up a bird is a line of sight connection, not propagation in the classic sense of bouncing off the ionosphere and ground like in HF comms. But, there are atmospheric phenoms that can effect VHF/UHF comms. Tropo ducting, but that is normally for terrestrial comms. Same for sporadic E, which is bouncing signals off of ionized clouds similar to the ionosphere propagation..Think horizontal. 
Then there is weather. Whether or not you have nice weather. Rain, snow, clouds and dust are a few of the things that can effect sat comms.
---  
 Ciao baby, catch you on the flip side.    
 GEO     

 http://www.w3ab.org

Time flies like an arrow, fruit flies like a banana. 

    On Wednesday, May 8, 2019, 7:12:57 AM PDT, Hans BX2ABT via AMSAT-BB <amsat-bb at amsat.org> wrote:  
 
 The last couple of days the Fox birds haven't been coming in as well as 
before. Signal strengths are down, fading has increased and it is almost 
impossible for me to open them. Now the sporadic E season also has 
kicked off in the last few days, with increased activity here in east 
Asia. Is this a coincidence or do the two have a connection? And are 
there other factors that influence LEO propagation? I know satellite 
tumbling is one factor that causes fades, but are there also ionospheric 
or atmospheric influences? Thanks for the insight. 73 de Hans (BX2ABT)
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