dmaavrigdo
Member
- Joined
- May 26, 2009
- Messages
- 350
- Reaction score
- 309
- Points
- 63
- My Satellite Setup
-
1.2m Laminas OFC1200 dish
Inverto Quad Black Ultra IDLT-QDL412-ULTRA-OPN
Octagon SF8008 twin
Yamaha HTR-2067
- My Location
- Vansbro Sweden
It is the mention of variations in the satellite signal that is relevant not sporadic E.Yes, but sporadic E is working mainly in HF or VHF bands, not in microwave I assume.
I used Sporadic E many times in the past for my QSO in 2 metres (144 MHz), and sometimes this propagation layer creates very short path (around 300-400 kilometers) in high HF bands (10 or 12 metres), and in 6 metres band too. Fantastic.
But all this has no relationship with satellite reception in Ku band I assume.
Back to my previous question, I do not understand why the same signal is stronger in a season (some months, not just one hour or two when Sporadic E is opened), and lower in a different season.
Also, there is no QSB (fading) as in the Sporadic E periods, so I do not believe it is the same situation. What do you think? Thanks.
" This is done by analyzing signal amplitude variations of the GPS L1 signal."
"experiments in Papua New Guinea which used co-located radiometer and satellite beacon receivers, detected diurnal and seasonal variations in the received satellite beacon signal level during clear sky that suggested the atmosphere played a role in the signal variation. These effects were termed as atmospheric tides, and could significantly affect the fade margin calculations in low margin systems. Additional evidence supporting the existence of atmospheric tides were found in several time series satellite propagation data collected from sites in North America and in Brazil. This showed that the atmospheric tides phenomenon also affects communications satellite links to temperate regions as well."