mc, There is no relationship between power output (measured at the transmitter end) and the antenna length. Any antenna will radiate, and all the power produced by the transmitter is radiated - losses may occur most anywhere (and everywhere) in the system, in the feedline, in the ohmic characteristics of the antenna, in losses due to absorbsion by objects near the antenna. We normally don't consider the losses by absorbtion until the frequency is well above the HF bands because it gets worse as the frequency increases (feedline loss does too). Part of the answer depends on how every part is matched to the other parts.
The RF power radiated by the antenna will be the power produced by the transmitter minus the power absorbed by all the loss contributors - so the real answer to your question is that it all depends on your specific antenna system. The antenna, its positioning, and the feedline are all a part of your antenna system, and must be considered together. 73, Don W3FPR > -----Original Message----- > > sometimes it is hard to find specific information, I am trying to > understand the relationship between power out put and antenna > length and its line losses . > > example: suppose I have a random length of wire hook-up of 20 > meters (ok, would that be 60 feet) and I have two watts output. > if I shorten the wire to 10 meters what will my watts output be, > frequency would stay the same for this example. > _______________________________________________ > -- No virus found in this outgoing message. Checked by AVG Anti-Virus. Version: 7.0.323 / Virus Database: 267.6.9 - Release Date: 6/11/2005 _______________________________________________ Elecraft mailing list Post to: Elecraft@mailman.qth.net 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
