Catenna resistor

Jim Strohm jstrohm at TEXAS.NET
Wed Jul 19 10:30:55 EDT 2000

Bill sez:

>I just bought a HeathKit Cantenna at a hamfest (Its my boat anchor's
>anchor!).  After some cleaning and sealing, I checked the resistor.  It
>measures about 40 ohms!

Dynamic impedance isn't the same as static resistance, but for
a Cantenna, 40 ohms is close enough.

Just for grins, calculate what your SWR will be for a 50-ohm
source driving a 40-ohm load.

Then...figure out whether your "50-ohm source" really DOES present
a 50-ohm source impedance at the frequencies of interest.

What you will find is the reason why so many old-timers could
use light bulbs for dummy l;oads.


P.S. IOW, have an 807 and don't worry about it.  (or a 4842)

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