I've got a project in which there is a 75 foot run of RG8U transmitter to antenna. Not the cheap stuff, this has foil, brad etc. I'm running 300 continuious watts through it at 98.1mhz . From day one it runs very warm to the touch. I'm seeing only a slight reflected power. I always thought RG8U would handle up to a kilowatt continuious and have in fact used it for temporary AM transmission with little heat.
So here's the question, is this heat normal at that frequency and power level? If not I can probably squeeze a half inch line in place of the RG8. Could you reccomend a 1/2 inch relatively flaxable cable as a substitute? There is a relatively sharp 90 degree turn in the run ( 2 feet radius tops)so it would have to be bendable.
Thanks in avance for any suggestions