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## FW: [TenTec] Aux Antenna

 To: FW: [TenTec] Aux Antenna rohre@arlut.utexas.edu (rohre) 16 Sep 1998 15:48:30 -0500
 ```Since one satisfied user already posted that it works, here is the math to show how little power it costs. _______________________________________________________________________________ To: seweber@netnitco.net From: rohre on Wed, Sep 16, 1998 3:45 PM Subject: RE: [TenTec] Aux Antenna Steve, Look at the difference in 50 ohm antenna vs. 100,000 ohms. You would have a current that was very small being drained from the transmitter power going to 50 ohms. The transmitter would primarily see the 50 ohm antenna, or whatever the antenna low impedance is, and hardly miss the minute drain to the 100000 ohm ground. Consider that your insulators on the antenna when wet might be in the megohm range, where you would lose a microwatt of power. Lets say you have 50 watts from the TX. The ratio of the antenna impedance to the resistor is 1/2000. If it were 1/1000, it would lose 50 mw, but at 1/2000, it is only 25 mw. If you run QRP, just make the resistor something larger like a meg ohm. The idea is just to have some bleed off path for static voltage. In case of direct hit, it is toast anyway or for any size resistor, so it can be a low wattage carbon, but best sealed in epoxy so it won't get wet. Stuart -- FAQ on WWW: http://www.contesting.com/tentecfaq.htm Submissions: tentec@contesting.com Administrative requests: tentec-REQUEST@contesting.com Problems: owner-tentec@contesting.com Search: http://www.contesting.com/km9p/search.htm ```
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