Digital Radio Mondiale: a Pseudo TEM-cell receiver testing
The inspiration of this work dates back to the 1990s, when the BBC embarked on the testing of a large number of portable FM radios. The objective was to determine the performance - and especially the RF sensitivity - under conditions as close as possible to the 'real world'. To accomplish this, a 'pseudo TEM-cell' was constructed within a Belling-Lee screened room. The same screened room still exists at Kingswood Warren, and there is now a need to measure the performance of DRM receivers on the HF band. It is hence a good time to reassess the pseudo TEM-cell, and to improve the accuracy of its callibration if possible. A further motive for carrying out this work is to demostrate to receiver manufacturers that providing 'in-house' test facilities is not necessarily difficult or expensive. This paper discusses calibration techniques, and also explains how to calculate the field generated within any such pseudo TEM-cell.
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