[TowerTalk] 160M Antenna puzzlement

[Peter Voelpel]

No, R is too high, should read about 19 ohms in a lossless environment.
I would improve the radial system to get the impedance lower and then use a
1:2 unun to transform to 50 ohms.

73
Peter, DJ7WW

-----Original Message-----
From: TowerTalk [mailto:towertalk-bounces at contesting.com] On Behalf Of Pete
Smith N4ZR

I may be suffering from a case of too much information, but I'm puzzled 
by my new 160-meter inverted L, about 60 feet vertical with 8 on the 
ground radials each about 65 feet long

My old inverted L broke, so I put up a new one recently.  To my 
surprise, it resonated well above the band, indicating it was about 12 
feet short.  Because of uncertainty about the availability of additional 
height at the top corner,  I temporarily added the additional length at 
the bottom and loosely coiled it.

Measuring the SWR and R/X at the base of the antenna with my Rig Experts 
AA-55 Zoom, I now see a nice textbook SWR curve centering on 1820 KHz. 


Measuring the R and X at the same place, I see R of about 30 ohms and X 
crossing zero near the same frequency.  That seems a little low for only 
8 radials on the ground but...