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Amateur Radio application of Frequency Modulation (3127 words) |
 | Frequency Modulation (FM) is a system where the amplitude of a carrier wave is held constant while the frequency is varied in sympathy with the voltage of the modulating signal. |
| In a strict sense, an FM signal is one where the frequency deviation resulting from a constant amplitude modulating signal is the same for all modulating frequencies, whereas a PM signal is one where the frequency deviation resulting from a constant amplitude modulating signal is proportional to the modulating frequency. |
| Apart from the noise triangle benefit, both FM and PM benefit from noise reduction compared to AM because of the angular modulation, and the improvement is 20*log(m) dB where m is the modulation index. |
| Fibromyalgia and the Disability Dilemma (4507 words) |
| Most FM patients report that chronic pain and fatigue adversely affect the quality of their life and negatively impact their ability to be competitively employed (8-10). |
| FM patients may be told that they are "just out of sorts" and should get on with their lives (70). |
| Though FM patients do need to "get on with their lives", such flip-advice is not a constructive substitute for management advice based on a careful analysis of each patients dysfunctional profile. |
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