AM mode only.
Before you make any adjustments, see if you can get up to 400 watts peak with a 100 watt deadkey setting first by adjusting the RF power knob. A couple of watts even up to 20 won't make much difference so don't get too hung up on it. If you are pretty close to 400 watts PEP and 100 watts deadkey, I wouldn't mess with it.
I still would turn up the AMC (VR17 AM Modulation) pot near it's peak before adjusting the power ratio because low modulation will affect the peak modulation power output some. You can tell on your peak meter if your AMC adjustment is low or high with this pot.
I see it on your picture in your earlier posts and its on the page 44 of the manual. VR19 will adjust low power deadkey setting. Have your RF power knob on a low setting before you adjust this for a starting point.
VR15 to the right of VR19 is for the high power deadkey setting but will have the largest affect on the peak power. The pots are labeled and named for easy recognition.
For peak power checking just do the AAAAAAAUDIO thing in the mic. A dummy load is best if you have one for high power, if not as long as your antenna is nicely matched you"ll be fine.
It's a combination of adjusting both pots and the RF power knob to find the closest High power setting up to the 400 watt intended limit while adjusting the low power at or near 100 watts. You will have to occasionally move the RF power knob too while adjusting the other 2 pots. Most likely the RF power knob will end up somewhere between 9 o'clock and 1 when you achieve the closest balance of 4:1. Make note of the RF power knob position when you are done and leave it there.
Don't touch any other pots. None of this will harm your radio or throw it out of whack.
As long as you get a 4:1 ratio, your modulation will be at 100% regardless of what your radio's meter says. There is a pot to adjust the modulation meter if you want but don't do it until you know your at 100% or as close as you can.
