Connecting built in antenna tuner to ladder line.
On Sunday, November 25, 2012 4:08:00 PM UTC-6, Tom W3TDH wrote:
Thank you in advance to all who choose to tackle this question.
Assuming your folded dipole is a resonant antenna with a feedpoint impedance around 300 ohms, with a 1:1 balun, the 50 ohm SWR would be 300/50=6:1 and that is probably outside the range of most built-in autotuners. Assuming a 300 ohm feedpoint impedance, a 4:1 balun would bring the 50 ohm SWR down to 75/50=1.5:1. 4:1 baluns are inexpensive so I suggest a 4:1 balun as a first try. You might get by with the less expensive 4:1 voltage balun but I recommend a 4:1 (dual-toroid) current balun.
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73, Cecil, w5dxp.com
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