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Message: <blockquote data-quote="Old Fred" data-source="post: 25780">Well I've learned something new! I thought that polarisers let ALL signals through but merely rotated them all by a number of degrees (up to 90') when a current is passed through the coil. But clearly they block signals of one polarisation. BTW the current required is normally anything up to 100mA (but more usually up to 50mA maximum). It's possible to make a simple one-transistor current controller for the purpose of manual control.As for Invacom LNBs, I've heard that the twin- and quad-output versions work better than the single. Something to do with polar separation?Fred</blockquote>