WX5812
Member
I am curious what some of you prefer as your tx audio setting. Pre emphasis on or off?
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APX series TX audio
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wgbecks
Active Member
For FM voice communications you want pre-emphasis turned on for without it you'll sound muddy at the receiver. However, if your mission is to send analog data via an FM transmitter then you will want to disable or turn off pre-emphasis.
The idea of pre-emphasis in FM communications is to improve the signa to noise ratio of the higher frequency speech components that add the most to intelligibility by have the least amount of speech energy as compared to the lower frequency components. Pre-emphasis boots
the higher frequencies at a rate of approximately 6 dB per octave on the sending end and de-emphasis at the receiver reverses the process before sending the audio on through to the speaker.
The net result is that the higher speech frequencies get a boost in deviation (modulation) for transmission such that if the receiver signal level is degraded that there will be more recovered high frequency speech energy than noise.
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