[Antennas] 80 meter delta loop

2004年4月06日 13:38:07 -0800

At 07:27 PM 2004年04月05日, w4tey wrote:
>I'm thinking about putting up an 80 meter delta loop. The dimensions I'm 
>getting are right at 258 feet for the radiator. Would a 4:1 balun be of 
>any benefit? It will have to be fairly low 25 to 30 feet at the supports 
>and maybe a little higher at the feedpoint and horizontally polarized. Any 
>suggestions or ideas?

The feed impedance at that height will be about 70 to 80 ohms (resonant 
about 3.93 MHz), so a 4:1 balun wouldn't be appropriate for 80m single band 
operation. On 40m, the impedance will be near 200 ohms, but for the length 
you specified, it will be resonant well above the upper band edge (about 
7.6 - 7.7 MHz).
73, Terry N6RY
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