I am currently working to transmit a Continuous Wave(CW) signal using ADALM Pluto with GNU Radio. I want to transmit a simple CW signal out from the ADALM Pluto using the signal processing blocks in GNU Radio with only a single pure sine wave signal at the output of the ADALM Pluto transmitter.
As of now, the output of the ADALM Pluto transmitter I am getting is a complex signal(consists of a 0 degrees sine wave and a sine wave with 90 degrees out of phase) instead of a pure single sine wave at the Pluto transmitter's output. Is there a possible solution to transmit a CW signal of a single pure sine wave out from the ADALM Pluto using the signal processing blocks in GNU Radio?
Yes, there are two ways to accomplish this task.
1. Send a purely real tone to Pluto (zero out the I or Q signal).
2. Generate I and Q tones which are in-phase with one another.
Thanks for the advice Travis! Just to clarify with you, if I use those methods you have mentioned above and I visualise the output waveform transmitted from the Pluto's transmitter on my oscilloscope, would that mean that I would see the pure real signal riding on the carrier signal as it is being multiplied with the LO frequency before it is being transmitted out from the Pluto's transmitter?
My objective is to transmit a purely real tone out from the Pluto's Transmitter without the "Q"(Imaginary signal) signal and the carrier signal present in the output waveform when I visualise it on my oscilloscope. Any advice on that?
Yes, zeroing out I or Q will provide a signal at LO+tone frequency.
You cannot bypass the mixer stages, so if you want to view a baseband tone you will need another device.
Thanks Travis for the advice once again!
Kindly, can share with me the CW flowgraph? I am a beginner in this field and tried to find an example of the CW flowgraph but couldn't find any online. I just need a real simple example of how it looks like.