"Diversity Receive" is used 100% of the time at K0UO
Updated: May 23, 2021
With the Icom 7610 using the new Diversity Tracking Function, and attaching separate antennas to the antenna ports in the Tracking receive mode, you have true "Diversity Receive". It is a fantastic Improvement in reduction of QSB/fading. If one antenna is experiencing a deep fade, it is likely that another has a sufficient signal. Pattern diversity consists of two or more co-located antennas with different radiation patterns. This type of diversity makes use of directional antennas that are physically separated by some distance. Spatial diversity employs multiple antennas, usually with the same characteristics, that are physically separated from one another. Phase Synchronous Diversity Reception uses two widely spaced antennas (500 to 1500+ feet) feeding two identical high performance SDR receivers. Depending upon the expected incidence of the incoming signal, on the order of a many wavelengths. Collectively they are capable of discriminating a large portion of angle space and can provide a higher gain versus a single omni-directional radiator. This is absolutely a major Improvement, with Diversity Receive my station uses over a mile of wire listening to signals coming in at different angles. Signal-to-noise ratio (S+N/N ratio, or SNR) is one technical aspect not too many amateurs give a second thought about, however if you can't hear them you can't work them. This is very apparent on audio reception, Diversity eliminates much of the audio amplitude fading. The RF signal is almost never in a stable phase relationship at both places at the same time. This means the signal will have random phase and amplitude differences. The arrival angle and polarization of incoming signals will change. This generally results in the fading, by having two antennas, the chances are that while one experiences a fade, the other will not.The power is in the diversity, Icom did it right on the IC 7610.
A few years ago I was very honored to have been personally invited by Icom's American President Hiro Nakaoka a few years ago, to meet with him and key staff members at their WA office to discuss a mutually interesting project. Later several key Icom executives also visited my office in Kansas.