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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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phase shifter circuit needed
I'm looking to build to a phase shifter circuit that can supply about 60
degrees of phase shift at 70 MHz (bandwidth not important). The phase shift needs to be adjustable in real time, ie, with a variable R or C. The catch is that the input and output of the network needs to remain matched to 50 ohms. Can this even be done with purely passive components? (Specifically, what I have is a transmission line that needs to provide a 180-degree shift from the start of the line to the end. The problem is we have no way to precisely measure the length of the TL. So we need a way to adjust the "length" of the line in real time. Now, I'm aware of the trombone method, wherein a piece of TL is slid in and out to provide a variable lenght. However, this is a mechanical solution and not suited for the application; ergo I need a way simulate this behaviour) Thanks very kindly |
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