[1000mp] Diversity reception using the FT-1000MP

[Tom Rauch]

> My dipoles for 21 MHz are only spaced vertically about 0.3 wavelength,
> 
> but there is still an diversity effect on the signals as you can hear
> 
> on my recordings.

I certainly agree that with two antennas with very different patterns 
(not necessarily gain, but pattern) and similar S/N ratios on each 
antennas, there will be times when fading is different on both 
because the signal can arrive from the null of one antenna while not 
being in the null of another.

I was trying to make two points:

1.) Any improvement in the readability of weak or marginal signals is 
much more enhanced and much more consistent with wide or very wide 
spatial separation in terms of wavelength. It is a day and night 
difference on weak signals.

2.) The antenna and receiver system must have very similar phase, 
bandwidth, and S/N characteristics to improve copy of weak signals. 
When signals are out of the noise, that isn't so important. But if we 
are digging for weak ones or want the most consistent improvement, we 
need everything to be as good as possible.

Like comparing a yagi at 100 feet to a dipole in a tree, we have to 
know which is better and how much. Otherwise we will never have a 
goal to work towards. It doesn't mean the one won't work and isn't 
worth having, it just means that the other works much better in more 
cases and should be what we try for.



73, Tom W8JI
W8JI@contesting.com