Page 14 of this pdf says the SSB duty factor used in RF exposure calcs is between 20 and 50% depending on compression. I think that’s what you’re looking for.
https://transition.fcc.gov/Bureaus/Engineering_Technology/Documents/bulletins/oet65/oet65b.pdf > On Jun 16, 2020, at 17:33, David Rowe <[email protected]> wrote: > > Hello List, > > I've been working with Peter, VK3RV on the surprisingly tricky problem > of measuring FreeDV Tx power. > > Over the weekend I built an inline "sampler" and tried a few averaging > options to measure the power of a 700D waveform on my spec-an. I am > using my IC7200 with the drive adjusted so that the ALC just moves. I > am sampling the power between the IC7200 and my ATU, which is connected > to a dipole on 40M. > > I get 75W peak indicated on two bar-graph type power meters (on the > radio and ATU). > > Using "power averaging" and a RMS detector on the spec an over about 1 > minute I get about 40dBm (10W). > > The FreeDV waveforms all have a Peak to Average Power Ratio (PAPR or > crest factor) of around 13dB. > > 1/ Has anyone else tried to measure FreeDV power? > 2/ Does anyone know what the RMS/average power of SSB is (e.g. for a > 100W PEP signal)? > > -/- > > Where I am going with this .... 10W is a lot less than say RTTY or PSK31 > typically puts out. If we can address the PAPR of FreeDV waveforms by > even 3dB that's signficiant extra link margin. On the flip side I am > concerned about blowing up voice-rated SSB PAs with continuous high > average power levels. > > Thanks, > David > <sampler_46dB_sm.jpg> > <power_700D.png> > _______________________________________________ > Freetel-codec2 mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/freetel-codec2
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