[ICOM] Pro II Antenna Tuner question

[Ekki Plicht]

On Sunday 11 July 2004 01:03, Cletus W Whitaker wrote:

> Don't know what
> the patterns on the loops really are, but the dipoles
> are dipoles.  

Not quite.
I used to have a horizontal loop, approx. 8m (24ft) above ground, 56m (170ft) 
circumference. Tuned with a SG-230 tuner right at the loop.

A friend of mine, who has NEC4 and knows how to use it, modelled the antenna 
for me. We found that the antenna has only one lobe on 80, with a quite high 
elevation angle, two lobes on 40, one high one low elevation. 
The higher we went in frequency the more lobes we got - IOW: the antenna has 
severe nulls at a lot of elevations.

Practice showed the same: it was an excellent antenna on 80 and 40, still 
useable on 30, but higher up it was just a matter of luck if the elevation 
angles matched. A GAP Eagle at the same location performed much better on 
higher bands (20 to 10m).

73,
Ekki, DF4OR