[Antennas] VSWR on Log Periodic.

Sun, 28 Apr 2002 20:02:17 -0400

Comment inserted below:

Cletus W Whitaker wrote:
> 
> de WB2CPN  South Central Pennsylvania USA  2002.04.27
> 
> Everything I know I learned from some one, so this is no exception. Which
> means I'm never afraid to ask, no matter how dumb:
> 
> If I take my trusty Bird ThruLine Wattmeter and measure the indicated power
> going into the transmission line, and the power coming back, then measure
> the loss of the transmission line, why does that not tell me the level of
> power arriving at the antenna and the level of power reflected by the antenna.
> The usual SWR formula for P1/P2 should tell me the SWR at the antenna.  Or does
> it?  If not, why not?  My early observations indicate that the SWR at the far
> end of a shorted transmission line is Zero.

Please tell me HOW The SWR can EVER be Zero?
Don N8DE

>  (My General Theory of Antenna
> Activity states that the Current at the ends of a long wire or dipole antenna
> is immeasureablly close to Zero.)  The truth is mixed in here someplace.
> As some one said, the actual SWR of the antenna (the load) is always greater
> than what's measured at the transmitter end of the transmission line, (safely
> assuming that all transmission lines do have loss of some value or other).
> 73  Clete
> - - -
> 
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> Larry Wilson KE1HZ [email protected]
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