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Modern vehicles control the alternator with the car's computer. It will vary the output to help motor efficiency which causes the voltage to vary from time to time. On some cars, there is a sensor that the positive battery cable goes through. The car audio guys have the same problem but I am not...
I have a few different 4 pill amps, and I only give them about 50 to 60 watts input. This gives about 600w peak output at about 15 volts.
One thing that I like to do, is to increase the negative feedback to give more stable operation.
I smoked one of my 4 pills a while ago, and the members...
Five turns at 4.5 inches is what I usually do. More turns will make the frequency too low to be effective. Will take about 8 feet.
Edit: the picture shows one I just did with 10 feet of 400 flex.
While listening to some weak DX, I heard a familiar voice, it was @unit_399. Usually the DX is gone by this time in the evening, but the DX was still trying. I waited for him to finish his contact, and called out along with several other operators. JJ came back and we had a nice little QSO...
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