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<blockquote data-quote="s-band" data-source="post: 968844" data-attributes="member: 407744">The Airspy has a 10MHz reference input which makes it easy if you have a reference like the HP Z3816A or similar <a href="http://www.realhamradio.com/GPS_Z3816A_Receiver.htm" target="_blank">Z3816A GPS Receiver</a>. The RTL uses a 28.8MHz crystal. I've no experience of them but&nbsp; _<a href="http://www.leobodnar.com/shop/index.php?main_page=product_info&amp;cPath=107&amp;products_id=234" target="_blank">Precision Frequency Reference (GPS Clock) [GPS-CLOCK] - 150.00GBP : Leo Bodnar, Simulator Electronics</a> seems to get good comments and has a frequency agile output.Locking the LNB is covered here <a href="http://projects.osmocom.org/projects/miscellaneous-projects/wiki/C_Band_LNB_Ext_Ref_Mod" target="_blank">C Band LNB Ext Ref Mod - Miscellaneous Projects - Open Source Mobile Communications</a> but the TCXO I used is good enough for me.I locked a signal generator to a GPS source and used that to do the calibration of the whole chain. Not very amateur though. The simplest way to calibrate a system, without test gear, would be to use one of the C band satellite beacons although I think some can be a few kHz off. You could calibrate you RTL using ham beacons if you are within range. Set the ppm offset in SDR# to give the correct frequency.</blockquote>

[QUOTE="s-band, post: 968844, member: 407744"] The Airspy has a 10MHz reference input which makes it easy if you have a reference like the HP Z3816A or similar [URL='http://www.realhamradio.com/GPS_Z3816A_Receiver.htm']Z3816A GPS Receiver[/URL]. The RTL uses a 28.8MHz crystal. I've no experience of them but _[URL='http://www.leobodnar.com/shop/index.php?main_page=product_info&cPath=107&products_id=234']Precision Frequency Reference (GPS Clock) [GPS-CLOCK] - 150.00GBP : Leo Bodnar, Simulator Electronics[/URL] seems to get good comments and has a frequency agile output. Locking the LNB is covered here [URL='http://projects.osmocom.org/projects/miscellaneous-projects/wiki/C_Band_LNB_Ext_Ref_Mod']C Band LNB Ext Ref Mod - Miscellaneous Projects - Open Source Mobile Communications[/URL] but the TCXO I used is good enough for me. I locked a signal generator to a GPS source and used that to do the calibration of the whole chain. Not very amateur though. The simplest way to calibrate a system, without test gear, would be to use one of the C band satellite beacons although I think some can be a few kHz off. You could calibrate you RTL using ham beacons if you are within range. Set the ppm offset in SDR# to give the correct frequency. [/QUOTE]

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