I did the EZNEC model again using perfect ground. The ground losses
were indeed a couple of dB lower in every case, but if anything the
differential between the various versions (#18 copper versus #20 copper
versus #18 Copperweld) became narrower and therefore even less
consequential.
And as you say, EZNEC tries to account for skin depth anyway ... which
by the way is of course less at 80m (N2TK's situation) than 160m. The
Copperweld spec sheet says that there is about 4 mils of copper on #18
Copperweld wire.
73,
Dave AB7E
On 1/3/2020 11:21 AM, jimlux wrote:
On 1/3/20 9:26 AM, Jim Brown wrote:
On 1/3/2020 9:15 AM, David Gilbert wrote:
I modeled a simple 80m vertical with one elevated radial 10 feet
above ground
Not the best model for evaluating the effect of wire resistance --
ground losses dominate. Better to model with a GOOD radial system.
or model with a perfect ground - then the ground losses aren't an
issue and you can measure the loss in the radiator.
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|