First, let’s tackle the easy questions - - The LimeSDR does support TWO channels of transmit in a full duplex configuration (meaning, the two receive inputs are not shared with the transmit and can be tuned anywhere from the transmit outputs) and their power output of +10dBm means that the output power is 10mW (0dBm = 1mW, +10dBm = 10mW, +20dBm = 100mW, +30dBm = 1W and so on…). With 10mW of power you can use the LimeSDR in its native state for such modes as WSPR (which you can use with your General License when you get it), or even PSK31. With a little transmit amplifier that can be boosted to power levels of up to 5W or more - I’m actually working on a transmit/receive amp for the LimeSDR, too, for Amateur Radio use that will have an output power of 1 - 5W in the HF region (1.8 - 29.5 MHz). Developers are working on the transmit functionality and Simon Brown’s SDRConsole V3.0 will be one of the Windows applications that can support the LimeSDR for receive and transmit. Other apps will be out there, too, but there hasn’t been much buzz on this forum about it and I’m even waiting to hear more.
Here’s where it gets tricky…The LimeSDR CAN run on USB 2.0, but to get the ‘full fidelity’ of its features you’d need to run it at USB 3.0 - - the Android USB connection is generally USB 2.0 compliant and there are a handful of newer phones that support the SuperSpeed USB 3.0 - but not very many of them. Also, the drivers that are out there (especially the SoapySDR pieces that make integrating this much easier with the LimeSDR) are suitable for PCs running Windows and Linux, but I don’t think they’re compiled or written to be compliant to an Android environment yet. If you have a stout heart, PLEASE dive in and do it…! You’ll no doubt get A LOT of interest on this (including from me) if you can make it happen.
The best place to learn anything on SDR is from three sources I know:
Just from those links (and those on their sites) you’ll learn enough about SDR to be dangerous. Especially look into the OsmoSDR website - that was the cradle of all things SDR related for the Ham and Hacker community
Let us all know if you need further info - glad to see you on the forum, and good luck in your endeavors for LimeSDR…!