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Abstract
A technique for measuring high values of ‘Q’ of microwave cavities is described. The problem of measuring very narrow bandwidths, say of the order of 0·5 mc/s. or less centred at a microwave frequency, is considerably simplified by obtaining the same response curve centred at an I.F. frequency, as the effective Q then is very considerably reduced. Consistent and reliable results have been obtained on the measurements of Q of the order of 20,000 of a cavity resonant in the ‘X’ band.