Re: [TenTec] NEC, ground, grounds, and radials.

["Dr. Gerald N. Johnson" <geraldj@weather.net>]

On 1/7/2011 5:53 PM, Rsoifer@aol.com wrote:
> When I was an undergraduate at MIT, there was a requirement for a
> Bachelor's degree thesis.  Mine was about bouncing 2m  signals  off Echo II 
> (see my
> QST articles about that in 1962).  Anyway,  they invited three prominent
> professors, all of them hams, to be on my thesis  committee.  They quickly got
> into an argument about whether 20 dB (voltage)  was the same thing as 10 dB
> (power).  I just kept my mouth shut, and  got an A.  True story.
>
> 73 Ray W2RS
One of those trick questions. They are the same ONLY if impedance is 
preserved for the voltage measurements. If impedance is not preserved 
they are not the same.
In a job interview I was asked if I could vary the source impedance, 
what source impedance would give the maximum power to the load. Another 
trick question.
>
At my MS final oral I was asked to develop the fourier transform for a 
sinewave. I knew the answer but the math professor (I should have known 
better than to have had a retired head of the math department professor 
emeritus on my committee!). I struggled with it not remembering the 
exponential expression for a sinewave, he finally gave me that, but 
e^it, not jt and I stood there for minutes (felt like hours) wondering 
how I was going to integrate those currents in the exponents... Finally 
I recognized that i wasn't a variable it was sqrt(-1),said "Ahah" and 
rapidly scratched out the solution. I passed and went back for more 
after trying to wear out a new wardrobe of green (not my choice).
73, Jerry, K0CQ