[Antennas] 160 Inverted L 160 Radials

Thu Nov 17 12:43:34 EST 2005

At 04:41 PM 11/16/2005, you wrote:
>Did you get a chance to evaluate what the author said as opposed to how he 
>said it? What do you think? Is it reasonably good for my first 160 antenna?

Reading over KE4UYP's information there is several of his statements that 
are not correct. For example his statement that a vertical's efficiency is 
less than 50% for twenty-meters and above and less than 20% efficiency on 
forty-meters and below is nonsense. Brown, Lewis and Epstein's studies more 
than five-decades ago discredits that statement.
He goes on to say the an adjoining mast can be metal on non-metallic as it 
"It really does not matter" then, later in his document, contradicts that 
statement stating different bandwidths for a metal tower vs. tree mounting 
for his antenna.
In that I had a little time this morning to mess around I modeled his 
antenna using NEC4 (Although NEC2 give almost identical results) comparing 
his so called vertical with a standard ½-wave dipole and a ¼-wave vertical. 
I used KE4UYP's recommended height for the eighty-meter version of his 
design (25-feet). This same height was used for a ½-wave dipole reference. 
For those who might be interested I've placed the total gain elevations 
plots on my web site and they can be view at: 
http://k6mhe.com/sub/KE4UYP_Vertical.gif
As to those comments regarding spelling and grammar I offer the following:
I cdnuolt blveiee taht I cluod aulaclty uesdnatnrd waht I was rdanieg. The 
phaonmneal pweor of the hmuan mnid. Aoccdrnig to a rscheearch at Cmabrigde 
Uinervtisy, it deosn't mttaer inwaht oredr the ltteers in a wrod are, the 
olny iprmoatnt tihng is taht the frist and lsat ltteer be in the rghit 
pclae. The rset can be a taotl mses and you can sitll raed it wouthit a 
porbelm. Tihs is bcuseae the huamn mnid deos not raed ervey lteter by 
istlef, but the wrod as a wlohe. Amzanig huh? yaeh and I awlyas thought 
slpeling was ipmorantt.
73,
Danny, K6MHE
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