今天继续收集资料,并到towertalk讨论组上请教,没有想到第一个回答我的是香港的vr2bg。
他的建议大意如下:
1)天线之间的距离,要视乎实际的地形、所需要的发射仰角、天线的高度。
2)天线的主梁短一些(单元数少一些),方便安装;另外,使用单元数量为偶数的八木天线,方便八天线安装在铁塔的一侧(这样安装在铁塔中部的天线,使用环形旋转器来转天线,环形旋转器看附图)。
-----original message-----
from: vr2brettgraham [mailto:vr2bg@harts.org.hk]
sent: saturday, february 24, 2007 9:52 am
to:
ltw@vip.163.comsubject: re: [towertalk] two 15m yagi stacking
terry:
although it doesn't help me to help make it harder to beat b7p.... ;^)
best to model with actual terrain & see at what angles the energy goes for various stacking heights.
you have a little more flexibility with placement of shorter boomed beams & an even number of elements generally is easier to deal with on a side mount (especially when you decide to rotate it later).
73 & hlny, vr2brettgraham