[amsat-bb] Re: Yubileiny downlink spectrum overlaps AO-51 downlink

[G0MRF@aol.com]

In a message dated 02/06/2008 16:25:21 GMT Standard Time, oz1my at privat.dk  
writes:

Hi  all,
Please this is just a technical matter :-)

Here this afternoon  with Yubileiny AOS at 1430 UTC and 
AO-51 with AOS at 1441 UTC in  Copenhagen, the downlink 
spectrum of Yubileiny was strong when listening  to 
the AO-51 frequency.



Hello Ib.
 
Oh dear, no frequency co-ordination! 
 
A week or so ago I looked at the transmission from Yubileiny and it was  
almost constant amplitude over a 4800Hz bandwidth slowly reducing beyond  that.
 
If you allow for the practical width of our IF filters and the fact doppler  
can shift the frequencies by +/- 10kHz, at 435MHz, then Yubileiny and AO-51 
will  encounter each other from time to time. 
 
Thankfully the orbits are very different so it's a minor (but avoidable)  
inconvenience.
 
Thanks
 
David