I tested with a 500VA Variac that drops about 3V when transmitting.
185V in receive, the FT-980 24V show voltage right in the middle of area, but fluctuates a bit inside range when transmitting FM full power.
190V in receive and the voltage meter does not move when transmitting FM full power. The Variac drops 3V. So I decided to leave it in 193V so it drops to 190V when transmitting FM full power (I guess this is not advisable)
Of course SSB gives full power.
I have not done detailed calculation, but I guess this halves the heat dissipated in the PS. Now I see that temperature in PS and PA are more equal.
When I consolidate tests, I will have two options, an autotrafo 230/190V that is the best solution or somerhing like a 15 Ohm 100W resistor in series with the mains, that would not resolve the overheating in receive, but help in transmission.
But the radio beast says that is a 530VA (that I doubt to produce 100W out) if so there is the real proof of the heat. 530VA IN >> 100W OUT not a very ecologic radio.
I have not tested with a local OM to see effects (if any) in the quality of transmission.
73 EA1FC
