On 2/20/2013 12:47 PM, Dan Maguire wrote:
I'm a "visual" type guy, so I modeled Jim's 80m dipole at heights above ground
from 10 to 30 meters using three different soil conditions. Here's the
picture-worth-a-thousand-words:
http://ac6la.com/adhoc/80m%20Dipole%20R%20vs%20Height.gif
If you'd like to play with variations on this yourself, contact me off-list and I'll send
you the ".weq" model file for use with AutoEZ.
Dan, AC6LA
http://ac6la.com/
--- On Wed, 2/20/13, Jim Lux <jimlux@earthlink.net> wrote:
Here's some sample data from a dipole at 3.68 MHz, with legs
19.646m long, copper wire.
My 80m fan dipole which is 95' on one end and 10 feet on the other is a
tad under 30 ohms , measured.
The 40 m half wave center fed sloper is resonant at 7.200 where Z=402
bur Z ranges 42.56 @7.144 to a low of 38.76 @ 7.000
Top is roughly 85' angle is roughly 50 deg
I don't have the fan dipole connected at the moment so I can't give
actual numbers.
73
Roger (K8RI)
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
| 