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5Nzservice manual download site
5Nzservice manual download site
3. am through major adjustments.5Nzservice manual download site
5Nzservice manual download site
If the modulation amplitude is too large, the "audio + DC" composite audio modulation of audio signals are too large, will lead to amplifier too much electricity, or even breakdown FET occur. Adjustment method: when you open the transmitter between l and 18th stages, modulation and coding cycle of digital modulation and coding switch s dial to the OFF state, digital am M=l lOkW, incident power, on the basis of current of 50A joined the audio signal. Observation on the smart display amp current up and down as the modulation amplitude changes 45A~55A changes. If amp current is too large (to exclude other causes). Can be judged to be caused by excess modulation-transmitter "failure".5Nzservice manual download site
5Nzservice manual download site
Treatment methods: resize the audio signal modulation amplitude. OdB, 1kHz audio transmitter audio input input signal. The transmitter's RF output connector connect an oscilloscope, power on the observation of its modulation amplitude envelope signal on the oscilloscope, such as excessive, use small screwdriver to adjust the audio processing Board (ILA/HG2.231.000DL) audio processor U2-6 the output side of the W3, the modulation amplitude is reduced to 100%, and observe the amplitude modulation transmitter Panel instructions and audio input indicates whether the red light is lit. If it exceeds or is lower than 100%. With a small screwdriver to adjust amplitude modulation dashboard W3 and W4. make instructions and audio inputs indicate that 100% the red light just lit. Amp current up to 55A~60A.5Nzservice manual download site
5Nzservice manual download site
Withdraw the instruments mentioned above, joined the normal audio signals, open observation Panel increases the transmitter instructions. When broadcast in the language. One minute tune indicates that 100% there should be no less than 3 times the red light is lit. If less than 3 or more than 100%, indicating the audio input signal is too small or too large. Adjustable signal source of audio on the audio processor gain to make it fit. Observation of intelligent display screen when the incident power is 10kW, amp current as the modulation amplitude varies between 45A~55A (transient up to 60A).
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