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K-factor

In telecommunication, the term k-factor has the following meanings:

1. In tropospheric radio propagation, the ratio of the effective Earth radius to the actual Earth radius.

Note: The k-factor is approximately 4/3.

2. In ionospheric radio propagation, a correction factor that (a) is applied in calculations related to curved layers, and (b) is a function of distance and the real height of ionospheric reflection.

Source: from Federal Standard 1037C and from MIL-STD-188

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