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Message: <blockquote data-quote="s-band" data-source="post: 1031751" data-attributes="member: 407744"><p>I had a look at another LNB and the spurious is at 285.15625MHz which is 10x the reference crystal. The 9125MHz PLL uses 5 x xtal as its reference. I could shift the LO to 17920 by using a 28.0MHz xtal which would move the spur to 18.2GHz. This is the LNB arrangement <a href="https://www.satellites.co.uk/forums/threads/ka-with-prodelin-viasat-1-2m-band-b.171419/page-2#post-1019644" target="_blank">Ka with Prodelin/Viasat 1.2m Band B</a></p></blockquote><p></p>