The output filters are designed to match specific impedances and the impedance at the power amp output is a function of power. At very low power levels they are far from their design center.
IMX badly matched output filters are not usually consistent with good filtering and low spurious emissions. Ron AC7AC -----Original Message----- Dave G4AON wrote: > > Julian the problem with running low power through a high power PA is > that you get poor efficiency. A typical HF transceiver running 5 Watts > output from a 100W PA may be drawing 8 Amps to do so. The Elecraft > solution nicely improves efficiency and works well for most situations. > Okay, but if you are more concerned with reliability than the cost of the electricity bill, wouldn't it be better to run all the components conservatively well within their ratings, than endure the constant heating up and cooling down of the low power PA components? ----- Julian, G4ILO. K2 #392 K3 #222. http://www.g4ilo.com/ G4ILO's Shack http://www.ham-directory.com/ Ham Directory http://www.g4ilo.com/kcomm.html KComm for Elecraft K2 and K3 -- View this message in context: http://n2.nabble.com/Transmitting-low-power-through-the-PA-tp1299409p1299498 .html Sent from the Elecraft mailing list archive at Nabble.com. _______________________________________________ Elecraft mailing list Post to: [email protected] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com _______________________________________________ Elecraft mailing list Post to: [email protected] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
