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Electronics => RF, Microwave, Ham Radio => Topic started by: Chrisku on November 18, 2022, 02:49:46 am

Title: AM Modulation Drops
Post by: Chrisku on November 18, 2022, 02:49:46 am

Put my radio in AM mode and get about 100 watts with carrier only, Upon modulating (talking) the power output drops?? Shouldn't the power increase?

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Title: Re: AM Modulation Drops
Post by: radiolistener on November 19, 2022, 01:03:40 am

It depends on how modulation is implemented. When there is a carrier with fixed power which is mixed with DSB modulated signal, then the power sum will be increased. But if it uses fixed power which is shared between carrier and DSB signal, then the power sum will be fixed and carrier power will be decreased for the amount of power which is transmitted with DSB signal, but this is not classic AM.

Since you have the power sum drop, maybe your power meter is not able to measure power properly when waveform is not pure sine (which happens when you put modulation signal).

Title: Re: AM Modulation Drops
Post by: Wallace Gasiewicz on November 27, 2022, 01:42:42 pm

I do not know what radio you are using.
Usually the carrier should be 10-20 watts in a 100 watt transmitter.
Can you turn it down?