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A non-resonant microwave teclmique has been employed for the determination of saturation magnetisation (4rrMs) and g-factor of pure and Gd-doped single crystal YIG spheres yielding accurate values. It was found that 4"trM 8 = 1720-1751 g for undoped and 1595 g for 10~ Gd-doped YIG spheres while gett = 2.00-2.0039. The advantages of this method are simplicity and complete absence of propagation corrections necessary in cavity resonance experiments.