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#7
April 7th 11, 03:16 AM
posted to rec.radio.amateur.antenna
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40/15M dipole question
On 4/6/2011 2:51 PM, John - KD5YI wrote:
On 4/6/2011 6:28 AM, Cecil Moore wrote: On Apr 6, 5:56 am, wrote: What SWR reading could I expect to see from this antenna if I tried to use it at 21.300 mhz........in the same environment as stated above? EZNEC sez 11:1 with a feedpoint impedance of 100-j200 ohms. -- 73, Cecil, w5dxp.com Hey Cecil - I got: Impedance = 85.26 - J 186.3 ohms SWR (50 ohm system) = 10.337 (75 ohm system) = 7.308 Let's see if we can determine why they don't match. I adjusted the wire length for no reactance at 7.2 MHz. I used 99 segments of #14 wire. I did not include insulation effects. How about yours? John Are you using 9 segments? John |
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