多谢了!我找的是nu3e发表的dp资料,线圈如下:
table 1. specifications of the traps used in this antenna.
band trap form coax length coax turns design frequency actual frequency
10 m 3/4" pvc coupling (1.375" od) 20.25" 4 28.85 mhz 28.5 mhz, 28.7 mhz
15 m 3/4" pvc coupling (1.375" od) 26" 5.25 21.225 mhz 21.1 mhz
20 m 1" pvc coupling (1.625" od) 35.5" 6 14.175 mhz 14.2 mhz
30 m 1.25" pvc coupling (2.0" od) 46.25" 6.5 10.125 mhz 10.12 mhz
40 m 1.5" pvc coupling (2.25" od) 61" 7.75 7.15 mhz 7.15 mhz