On 12/2/2022 12:21 PM, Pete Smith N4ZR wrote:
I just added 5 more radials to the 13 I had originally under my inverted
L, and the R dropped from 34 to 31 ohms. Barely still worth doing, I guess.
It all depends on the difficulty/cost of adding more. The radiation
resistance of a vertical, which represents radiated power, is a function
of the vertical height, not the total length. There's a graph of this in
my tutorial. The combination of radiation resistance and ground loss,
both in Ohms, forms a voltage divider for the transmitter current, and
power lost is 10 log of the divider ratio. If, for example, you have
50-60 ft vertical, radiation resistance is likely to be less than 8 ohms.
73, Jim K9YC
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|