[amsat-bb] AO7 2013 Eclipse Cycle

K4FEG K4FEG at k4feg.com
Thu May 23 02:56:39 PDT 2013

Good Day everyone;

hopefully by now everyone is aware that AO7 is going into an eclipse as 
it passes over Antarctica and with the loss of sunlight on the solar 
panels the satellite is going into a Zero Voltage System Reset, and when 
the satellite comes back into the sun it is starting up in Mode B every 

Information from others have said that that is by design, but some of 
the reading I have been doing, suggests that the mode is random. The 
observations made so far indicate that it appears to be by design and 
NOT random.

I have noticed a slight variation in the Doppler adjustment from my 
previous program settings and there have been some reports of slight 
audio distortion. I am currently leaning towards the frequency 
variations and audio to being caused by temperature variations due to 
the lack of solar heating as the satellite passes over Antarctica, once 
again these are just my opinions.

Software predictions indicate that the eclipse periods will get up to 
about a maximum of a 3 minute period at the longest and it will be 
interesting to watch for any variations in satellite behavior at that time.

/*For now we have Mode B repeating, enjoy it Mode B users and Mode A 
will be back in a few weeks if everything stays like it is.*//*
I hope I am not boring everyone with these AO7 reports.

Thanks to Alan; ZL2BX and Ib, OZ1MY for their updates and observations.


More information about the AMSAT-BB mailing list