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Diversity antennas
Michael Coslo wrote:
I agree. One of the important factors as far as I know is that the antennas have to be in two different spots, and although I haven't measured, (I will now that I'm really interested) I'll bet that the best performance comes at a distance that is well related to the wavelength. Which is to say the picket fencing I hear on a mobile two meter signal might allow me to determine his velocity by knowing the frequency of the picket, the frequency of the transmission, with a likely but small error via Doppler shift. But aside from that little foray, I have no doubt that the effects that call for diversity antennas/receivers also call for some physical separation of separate antennas. Actually, the antennas can be co-located, they just have to have different patterns. There are some researchers in France who did a lot of work using an active whip next to an active loop. A pair of crossed dipoles would probably also work, which would have the advantage that you could use one of them to transmit with. |
#2
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Diversity antennas
Jim Lux wrote:
Michael Coslo wrote: But aside from that little foray, I have no doubt that the effects that call for diversity antennas/receivers also call for some physical separation of separate antennas. Actually, the antennas can be co-located, they just have to have different patterns. There are some researchers in France who did a lot of work using an active whip next to an active loop. A pair of crossed dipoles would probably also work, which would have the advantage that you could use one of them to transmit with. Okay, but I'd have to modify (my statement) that as there would have to be some difference in the antennas, even if co located. Some sort of difference that would make one antenna receive some particular signal better than another one. The crossed dipoles are an good example. As Roy pointed out, it depends on the parameter in question. - 73 de Mike N3LI - |
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