maximum usable frequency การใช้

• The maximum usable frequency for skywave propagation is strongly influenced by sunspot number.
• For broadcast sound purposes, 15 kHz is often chosen as the maximum usable frequency on landlines.
• Note that due to changes in ionospheric propagation caused by changing maximum usable frequency and frequency of optimum transmission it may not be possible to receive W1AW clearly on all frequencies.
• In 2011, signals traceable to China regularly sent powerful HF transmissions scanning wide ranges of HF frequencies, perhaps to determine the maximum usable frequency ( MUF ) or other variables.
• As any given blend has a trade off of maximum usable frequency, versus a higher mu value, within each of these sub-groups manufacturers produce a wide range materials for different applications blended to give either a high initial ( low frequency ) inductance, or lower inductance and higher maximum frequency, or for interference suppression ferrites, a very wide frequency range, but often with a very high loss factor ( low Q ).