I tried my D104 with my ubitx and got 50 milliwatts output while whistling into the mic.? The mic input impedance of the ubitx is much too low to work with the D104.? You and I both will have to build a mic preamp.? While I am at it I will add a gain control and maybe amplitude compression as well.? And then there is the issue of operating a linear amplifier with a ubitx.? When you get into power A L C is a good idea.? The ARRL handbook will show how to make A L C outputs for amplifiers and when using a ubitx the only place for the control signal to go is a mic preamplifier.? Note: the term A L C was used by Collins radio and most Collins owners would tell you that it stands for automatic load control.? I think owners of other brands would say automatic level control.
