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the switch for low and high power the contacts are gone or you need to check the DC voltage to the output section and the voltage drop on TX usually the likes of the cobra 148GTLDX has a bridge board you can remove and add some LCD DVM for current monitors and setting of bias etc so perhaps a regulator has failed or a resistor or the contacts on the switch you need to trace it out using current readings
The best way to set it is to get you a radio check, go to channel 19 and ask someone about three to five miles away to give you a radio check, start with your modulation all the way open and go from there.....hope this was helpful...
You have to adjust the high key first so make sure you're rf power is on high, hope you have a meter set it on the 20 watt scale, key up and turn vr 13
located in back of radio infront of where you're coax connector is until it keys around 12 watts, thats where most connex 33hp should be set,now go to low power and key adjust vr 16 right net to the otherone down to about 3 watts, now you can drive a liners. Mod is Vr 2 right below them two. whistle in mic and turn to get the mod you want.