Taps on the power transformer ensure the amplifier sees exactly the same voltage to the RF power amplifier module, no matter which mains voltage is used, as long as you select the tap as described in the Owner's manual. So there is absolutely no difference in the voltage, drive or temperature.
As Don noted, the only difference is the current demand on the mains supply which, of course, is twice at 120 V compared to 240V. But a standard American home 120V circuit will handle the load. I run my K3/P3 and a few other items including a couple of lamps from the same 20A 120V circuit as the KPA500 with no problem. 73, Ron AC7AC -----Original Message----- Hi Guys, Wondering if anyone has tested their KPA-500 on both 120v. and 240v. and documented the following: 1) When operating on 240v. was the PA voltage under load the same, higher, or lower than when operating at 120v.? 2) When operating on 240v. was the same, less, or more drive required for the same power output? 3) Did the KPA-500 PA temperature while contesting stay the same, decrease, or increase? Thanks! Dick- K9OM ______________________________________________________________ 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
