BH9DWE DL6WU的计算器对单元比较少的天线适用性不太好，图纸推荐参考DK7ZB现成的图纸，可以配合EZNEC之类的天线计算软件交叉验证一下； 正如楼上NIZ所说，U段波长很小，尺寸要精确（不过0.01mm绝对夸张了，个人经验差个一两毫米基本还能接受） 图上这种联轴器上坠的蝶形螺母对谐振影响应该不小，建议不拆的话不要用这么大的蝶形螺母； 馈电振子上接的馈线可以在主梁上绕几圈，或者在磁环上从穿几圈，充当巴伦，可以阻碍共模电流，降低驻波比
BG7MGW BA4JPR Specifically, the feed point should generally be controlled within 1 cm, as opposed to the 5 mm you mentioned. You can also use a 25 PVC tube wrapped with 7-9 turns to create a hollow choke to suppress common-mode current.
BG5CRW Try replacing the butterfly screw on the vibration isolator with an internal six-point flat head screw, making sure it doesn't protrude.
BI4MPY It's likely that the distance between the power supply unit and the antenna array is too close, causing interference. We can try adjusting it.
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