"They bias the LDMOS devices at 1 amp each. That is minimal in overall heat when you are pulling over 40 amps at high power. "
You beat me to it. My KPA500, keyed but with no RF input, showed 0.5 A at 76.7 V. That's only 38 W which is a small part of the 400 W plus PA dissipation seen in some operating conditions. All my measurements of PA dissipation take PA DC input and subtract RF output so my data include dissipation in the LPF. It would be interesting to separate the dissipation in the finals from the dissipation in the LPF but I don't know how to do that without modifying the amplifier. 73, Andy, k3wyc ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
