I have had an 857D for quite a while which i have used mobile. At some point, I noticed some erratic behavior like screen flashing and someone reported my signal had a chirp and wasn't frequency stable.
So, I adjusted the menu so I could see the voltage reported by the radio. In RX, it looked ok; something like 13.5 or so. But when I keyed down in CW at 100 watts, the voltage reported by the radio display went down to 10.8. I tried making the wires feeding the radio larger, etc. with no change. I also tried it indoors on an Astron RS-50M power supply and note the same huge voltage drop. Power output is about 80 watts. Any ideas of what I should check? This couldn't be normal??
Kofi
Kofi & Mimi in Ghana