Re: next ubitx
toggle quoted messageShow quoted text
There are several ways to do this. ALC is just one way. An easier approach is to do it in software. This needs a software that can control the 'mic volume'. you could set the value differently for each band.
there is another pay-off with software mic gain, it can make a major difference to the tx IMD. At voice peaks, the tx linear chain compresses. The gain is not constant between low and high levels of modulation. This is what the in-channel IMD is. Now, if we have a look up table that amplifies the peaks more than the lows, we can 'correct' the gain back to being linear. This simple concept goes by the name of 'pre-distortion' in the SDR world.
On Thu, Apr 18, 2019 at 9:21 AM Jerry Gaffke via Groups.Io <email@example.com> wrote:
If you want to electronically adjust TX power out on the uBitx, talk to John, VK2ETA