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<blockquote data-quote="s-band" data-source="post: 1025089" data-attributes="member: 407744">Hi [USER=297935]@satesco[/USER] , I have looked again and I now don't think it is FM. It is hard to tell as it is too wide for the analyser but it seems more like amplitude modulation of&nbsp; the data, maybe from the other polarisation? The amplitude variations are quite close to a sine wave at 20Hz.&nbsp; The total bandwidths of the 20Hz signals are similar to those of the data sigs on the opposite polarisation. It' almost like something is weird with the satellite unless it is a test mode. Looking at your Crazyscan plots, the 20Hz signals show up as spikes and I see that here.I get about 20-22dB cross polar rejection and your system looks similar from the levels at 11075 on you CS scan. The signal centred on 11670H is about 11dB higher than the 20Hz signal in 11670V so that suggests it is not related to x polar problems on receive.I wonder if&nbsp; [USER=402772]@Feedsat_DXer[/USER] has any ideas?</blockquote>

[QUOTE="s-band, post: 1025089, member: 407744"] Hi [USER=297935]@satesco[/USER] , I have looked again and I now don't think it is FM. It is hard to tell as it is too wide for the analyser but it seems more like amplitude modulation of the data, maybe from the other polarisation? The amplitude variations are quite close to a sine wave at 20Hz. The total bandwidths of the 20Hz signals are similar to those of the data sigs on the opposite polarisation. It' almost like something is weird with the satellite unless it is a test mode. Looking at your Crazyscan plots, the 20Hz signals show up as spikes and I see that here. I get about 20-22dB cross polar rejection and your system looks similar from the levels at 11075 on you CS scan. The signal centred on 11670H is about 11dB higher than the 20Hz signal in 11670V so that suggests it is not related to x polar problems on receive. I wonder if [USER=402772]@Feedsat_DXer[/USER] has any ideas? [/QUOTE]

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