sdr: RF level is only provided when requested and available
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@ -997,6 +997,8 @@ int sdr_read(void *inst, sample_t **samples, int num, int channels, double *rf_l
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if (channels) {
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for (c = 0; c < channels; c++) {
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if (rf_level_db)
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rf_level_db[c] = NAN;
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if (sdr->chan[c].am)
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am_demodulate_complex(&sdr->chan[c].am_demod, samples[c], count, buff, sdr->modbuff_I, sdr->modbuff_Q, sdr->modbuff_carrier);
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else
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@ -1013,6 +1015,7 @@ int sdr_read(void *inst, sample_t **samples, int num, int channels, double *rf_l
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avg = sqrt(avg /(double)count); /* RMS */
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avg = log10(avg) * 20;
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display_measurements_update(sdr->chan[c].dmp_rf_level, avg, 0.0);
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if (rf_level_db)
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rf_level_db[c] = avg;
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if (!sdr->chan[c].am) {
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min = 0.0;
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