Hi David, The Beverage and the vertical are both vertically polarized.
A single vertical is a very broad pattern with much less directivity than a Beverage. Since for receiving signal-to-noise is closely tied to directive pattern and not gain or antenna type, the vertical will have significantly less signal-to-noise ratio. By mixing them both in one channel the beverage is really being phased against the vertical, and this will almost certainly be better than the vertical alone. Anything quieter (more directive) mixed in would improve the poor S/N of the vertical. This is because the combination of the vertical and Beverage is more directional than the vertical alone, so being more directional it has to be quieter. I have no doubt the improvement seen by mixing the two is very real, but it would be better accomplished by using a noise canceller or phasing unit that allows adjustment of phase and levels, rather than random phase and level mixing. I'm not opposed in the least to having an ability to mix the main and sub channels at the audio output in diversity mode. Even though it is not diversity, it could have some uses for some people. For example, it could be used when receiving multiple directions on SSB. It would not be good for phasing two antennas, because the K3 slowly rotates phase shift between main and sub as the dial is rotated to new frequencies. It would be better to use a noise canceller to do that in front of the receivers if the receivers are not being used for split directions. I just strongly feel if allowed it should be something that can be locked out to prevent it from accidentally being applied to a system that is true diversity, since it would hurt that system. It could help people wanting to receive different directions at the same time using common bandwidths and other settings between both channels. maybe it is useful, but just under a different name (not in diversity) and way to activate. > What you are trying to achieve is a (rather expensive) implementation of > a, single, non-steerable, phased array antenna. It steers when the dial is turned, because main to sub phase rotates to a new difference as the dial is turned. If there really is no > phase difference, you've effectively synthesised a diagonally polarized > antenna (although I can't work out why your signal polarisations should > only occupy one quadrant). You don't have a diversity system. You > could achieve the same effect by summing at the input frequency after a > buffer/pre-amplifier. Both a Beverage and vertical are vertically polarized. It would not be diagonal polarization in most directions, it would mostly be vertical in any phase combination since both antennas primarily have vertical response. 73 Tom ______________________________________________________________ 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
