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Message: <blockquote data-quote="Llew" data-source="post: 948970" data-attributes="member: 175007">Maybe a microwave engineer could help on this one, but all I see in the DRO area is the usual Wilkinson divider from the DRO splitting the oscillator output to mix with the Ka H and V RF paths and the resultant O/P thence to the A7522 switch matrix IC.If as you say there's PLL at IF, I haven't checked where it might be happening <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite53" alt=":confused" title="Confused    :confused" loading="lazy" data-shortname=":confused" /></blockquote>