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Saheli

Advantages of F.M. telemetry 1. The transmitted power in F.M. is constant and is independent of the modulation depth, whereas in A.M. the power depends upon the modulation depth. 2. All the transmitted power in F.M. is useful, where as most of the A.M. power is not useful. 3. The F.M. reception is noise free, where as .A.M. reception is not so. The F.M. reception can be improved by using “amplitude limiter” or by increasing the “deviation”, this facility is not available in A.M. 4. There is lesser adjacent channel interference in F.M. 5. The F.M. broadcast happens in V.H.F. (very high frequency) and U.H.F. (ultra high frequency) bands, where less noise is present. The A.M. broadcast happens in M.F. (medium frequency) and HF (high frequency) bands, where happens to be more noise. Disadvantages of F.M. telemetry 1. About 10 times wider channel is required in F.M. as compared to A.M. 2. The F.M. equipment is complex and costly than the A.M. equipment. 3. The area of reception is much smaller in F.M. than in A.M.