In a message dated 02/06/2008 16:25:21 GMT Standard Time, oz1my@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