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When a signal specification is intended for a public broadcast service, it is vitally necessary to make sure in advance that: 1. It can be fitted into the spectrum (in this instance this means that it be compatible with the present monochrome system). 2. It will give satisfactory service. 3. It can be sent over the networks. Field tests, as opposed to laboratory measurements, with five transmitters and receivers from a number of manufacturers were made to test the NTSC signal specification. While difficulties were found in the field with a number of the earlier proposals, the final signal proposed triumphantly passed all tests and was recommended to the Federal Communications Commission for standardization and authorization of commercial broadcasting.