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<blockquote data-quote="s-band" data-source="post: 967733" data-attributes="member: 407744">It looks like your system is off by about 200kHz.I suspect that the drift your are seeing is from the LNB.&nbsp; I have a TCXO in the LNBF. The combined drift over 24Hrs is about 2kHz which JAERO can cope with so it does not need tweaking. The widest bandwidth on the latest SDR# is 16kHz on USB which is plenty. I can relate the drift on mine to day/night temperature changes. I'm using an Airspy but was using an RTL with a 1ppm TCXO. I may lock Airspy to a GPS source but there are enough cables across the floor already.I had quite good results with a £5 RTL stick once I took its case off. That did need tweaking after it had warmed up but its self-heating kept it steady after that. It has a surface mount xtal which may be a bit better than the large can ones.Here's a capture showing 15W a few minutes ago. The signal in the centre is calibration at 3615.8MHz locked to GPS showing the I have an error of around 3kHz</blockquote>

[QUOTE="s-band, post: 967733, member: 407744"] It looks like your system is off by about 200kHz. I suspect that the drift your are seeing is from the LNB. I have a TCXO in the LNBF. The combined drift over 24Hrs is about 2kHz which JAERO can cope with so it does not need tweaking. The widest bandwidth on the latest SDR# is 16kHz on USB which is plenty. I can relate the drift on mine to day/night temperature changes. I'm using an Airspy but was using an RTL with a 1ppm TCXO. I may lock Airspy to a GPS source but there are enough cables across the floor already. I had quite good results with a £5 RTL stick once I took its case off. That did need tweaking after it had warmed up but its self-heating kept it steady after that. It has a surface mount xtal which may be a bit better than the large can ones. Here's a capture showing 15W a few minutes ago. The signal in the centre is calibration at 3615.8MHz locked to GPS showing the I have an error of around 3kHz [/QUOTE]

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