Single magnetrons are commonly used to drive accelerator cavities, but many applications require multiple sources which can provide phase control operating into multiple cavities. Conventional injection locking techniques provide the means to phase lock magnetrons to within 1' rms phase error but these techniques use circulators. Where weight is a concern or when high power is used, circulators are not feasible or available. We are investigating a number of approaches to achieve phase locking

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... d power combining without the use of circulators. ,4 series of experiments have been undertaken where two magnetrons are injection locked and power combined, first operating into a matched load, second operating into a tunable short, and third operating into X-band cavities.