nation with a power density variation of ± 0.5 dB maximum in the space occupied by the cages (Fig. 1). A platform covered with anechoic material was used for the support of the cages that housed the birds and the plywood walls of the irradiation chambers were lined with anechoic material. The radiating source was a Narda #645 standard-gain horn which provided linearly polarized radiation. Horns were positioned for overhead illumination. Seven replicates of the irradiation chamber were built. Three irradiation chambers were operated at 0.1, 1.0 and 10.0 mW/cm2, respectively, from one Cober S6F generator, using topwall couplers of 20 dB and 10 dB for the horn feeds to the first two chambers and a direct waveguide feed to the horn in the third chamber. Two irradiation chambers were energized by a dedicated Cober S6F generator and were used for the 25 mW/cm2 experiments. The remaining two chambers were control chambers. Control and irradiation chambers were identical with the exception of the presence of the micro wave radiating horn in the irradiation chambers.
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