I just am trying FreeDV and only get 10 watts out on 6500 is that normal ?

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FreeDV  power out

Photo of Ray Gustafson WB0HHM

Ray Gustafson WB0HHM

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Posted 3 years ago

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Photo of Cal Spreitzer

Cal Spreitzer

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Anywhere from 10-25 watts sounds about normal for FreeDV, at least that's what I see when I'm running the mode using a LP100A Wattmeter.   The FreeDV Waveform  "How To Guide"  says the following about Power Output:

Power Output: The FreeDV modem signal is a 17-tone subcarrier system, where the sub-carriers
are PSK and QPSK modulated. As a result, FreeDV has an effective Peak to Average Ratio (PAR)
of 6 dB. This means that a signal with a peak power of 100 Watts (the peak power rating of the
FLEX-6000) will have an average power of 25 Watts. The transmit levels inside the FreeDV
module have been adjusted, so that a maximum setting of the Transmit Power Control Slider
will result in a Peak power output of 100 Watts which corresponds to an average power output of 25 Watts. The power meter on the transmit display of the FLEX-6000 during transmit will
typically bounce rapidly and continuously between the peak and the average values. This is normal.