There is a very simple answer for that. All you care about for receive is signal-to-noise ratio on YOUR end of the path... efficiency is irrelevant because there is usually plenty of gain in any modern receiver, and if there isn't enough gain a simple low noise preamp fills in nicely. That means any antenna with a good enough pattern (or the right polarity) to discriminate against noise will usually make a good receive antenna. Beverages and various loop configurations (K9AY, pennants, etc) work well for that but they are very lossy and don't make good transmit antennas.
For transmit, you care about signal-to-noise ratio on the FAR end of the path, and since you have no control over the noise over there you can only try to optimize your signal strength. The efficiency of your transmit antenna/feedline/etc is the first priority, with directional gain from pattern also being desirable. For some bands, you can get both transmit efficiency and receive noise discrimination from the same antenna, but for the low bands that is pretty difficult to do without devoting the space and money to some sort of monster array. For good antenna efficiency you almost always need size or height that is an appreciable percent of a wavelength ... for good pattern you often don't. Dave AB7E On 2/29/2012 4:51 AM, Monty Shultes wrote: > Of course I don't understand why you would receive better on one antenna and > transmit better on another. > > ______________________________________________________________ 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
