Running the help file on the tx_waveforms example program yields a bunch of different settings. With regard to the gain and power settings, how is the output power determined? For example: Amplitude of the waveform [0 to 0.7] What does the value 0 to 0.7 represent for the waveform amplitude and how does this correlate into an absolute output power? Gain for the RF chain Is this gain in dB? If not, then how does this correlate to an absolute gain? Transmit power (if USRP supports it) If I am supplying waveform amplitude and RF gain, then how does how does transmit power affect these? Is this a value in dBm? Also, what is the best way to reduce spurious signal emitted from the transmitter? I see some discussion about using fractional-n tuning to do this.

USRP Software Radio

Example transmitter program (tx_waveforms) output power and spurious components

Running the help file on the tx_waveforms example program yields a bunch of different settings. With regard to the gain and power settings, how is the output power determined?

For example:

Amplitude of the waveform [0 to 0.7]
- What does the value 0 to 0.7 represent for the waveform amplitude and how does this correlate into an absolute output power?
Gain for the RF chain
- Is this gain in dB? If not, then how does this correlate to an absolute gain?
Transmit power (if USRP supports it)
- If I am supplying waveform amplitude and RF gain, then how does how does transmit power affect these? Is this a value in dBm?

Also, what is the best way to reduce spurious signal emitted from the transmitter? I see some discussion about using fractional-n tuning to do this.