BH8GLQ 想去户外短波野架,不是很喜欢正V得带个灯架(35kg的重量),搞得根本都不便携。 目前测试这么几个: 有个GP,但是5.6m的,40m波段就没法达到1/4波长,需要再接个线圈加感 在楼顶拉了根做End Fed Random Wire,那个尺寸,目前只能当固定天线用 想尝试的是rybakov antenna,大概是另外一种End Fed Random Wire,有架设过的台友吗?杆子是怎么搞定的?
BH5UNT 提供一种思路:钓鱼佬用的抄网杆 或 高枝采果用的伸缩杆(选碳纤维的会比不锈钢的轻便很多,反正不承重)。 关于固定:如果周边是土壤,就拉绳打地钉,如果是硬质水泥地面(且打算较长期架设),可以考虑广告旗杆的底座,有种可以注沙或注水的,或者路上能看到那种用润滑脂桶子浇水泥进去 中间留个洞的玩意儿(一般用来插遮阳伞的) …… 架设时小心周边电气安全。
BH8GLQ BH5UNT Thank you for this idea; I was also considering doing something similar. The use of fiberglass poles, which are non-conductive, for overhead power lines is preferable to using carbon fiber poles, as the conductive nature of carbon fiber would affect the impedance of the wire.
BG7MGW When using a 4:1 Bauer, I remember that it's intended to be used with the "Sky Adjust" system. If you want portability and high efficiency, this is essentially an impossible combination; you have to compromise.
BH8GLQ BG7MGW Yes, the Rybakov antenna is essentially a multi-band antenna, and it cannot achieve natural resonance in every band. However, the antenna is much more convenient to carry around than a set of multiple, individually tuned antennas.
BG7MGW BH8GLQ Alternatively, you could directly purchase aluminum alloy fishing rod supports and use them to build a vibrating device; I think this should be feasible.