A general rule of thumb that applies equally to any rig is to preset the power output to some level (for example 4 watts) and then increase the TX audio gain (either via the rig or computer) until the measured RF power out stops increasing. Then for good measure, back off the TX audio gain slightly. This will ensure that you are always getting the maximum power output without overdriving. Using this approach over time you can probably figure out an appropriate ALC level that puts you at this same point and then just use that ALC level as an indicator that you have the gain settings right. Audio gain is set at a number of stages within the computer (soundcard and app) and also a level control in the rig.? It is always best to try to balance those out so they are all mid-range of their respective settings as maxing out the gain at any one stage/place could introduce distortion.?
Some people will argue that there should never be any ALC indication whatsoever for digital mode operation but the truth is that it all depends on how things are implemented by the manufacturer of your radio. With my Yaesu FT-991A for instance, if I set the rig up for zero ALC indication for digital modes I get zero power out. The right answer for that rig is about 50% ALC indication.?
Cheers
Michael VE3WMB?
