本人将在34层的楼顶上架设一个7.2米的X700H天线，我家在21楼，我算了一下，加上走管道井穿墙等到设备旁边至少要80米，那么问两个问题，一，用多粗的馈管，1/2还是7/8，二，玻璃钢天线分四节，如何在第三节上加防风绳，我怕风摇断了。以上问题请用过的前辈们给予指导，谢谢。

请使用过X700H或玻璃钢天线的前辈们给点支持。谢谢了。

@"BI1JNP"#p4353 谢谢前辈的指点。

80米高度，UV段用多粗的馈管，1/2还是7/8，

@"chaifa"#p4364 从衰减上来说肯定越粗越好，但你要考虑拐弯问题，进屋以后肯定要转接馈线，要不然拐弯都费劲。

前辈，再请教一个方案，我要从窗户伸出外面，在窗户上做个三角支架，上面架个车台天线，现在要问一下，支架伸出墙外要多长合适。

@"chaifa"#p4378 uv段大概1m应该够了吧，好像是说1/2波长？

@"chaifa"#p4378 至少1米~ 1.5米以上为佳 2米最好~

@"chaifa"#p4364 80米 1/2馈管~

谢谢前辈们的交流，我采纳了伸出1米的建议。

另外再问个问题，在窗外架设车台，我看到有的老HAM，天线下面接个地网，UV段有用吗？能推荐的更好。谢谢了。

I would like to seek advice from experienced individuals regarding the installation of glass fiber antennas. Your support is appreciated.

chaifa

I plan to install a 7.2-meter X700H antenna on the roof of the 34th floor. My house is on the 21st floor, and after calculating, including walking through the utility corridor, drilling through the wall, and reaching the equipment, I estimate it will be at least 80 meters. Therefore, I have two questions: First, what diameter should the feed cable be (1/2 inch or 7/8 inch)? Second, the glass fiber antenna is divided into four sections; how can I attach a windproof rope to the third section to prevent it from breaking due to strong winds? I would appreciate guidance from experienced individuals who have done similar installations. Thank you.

chaifa

Please give support to those who have used the X700H or glass fiber antenna before. Thank you.

BI1JNP

X700拉风绳会直接导致天线拉断，这种玻璃钢天线设计出来就是免拉风绳的。你可以看详细参数，除了台风费点劲其他风随便抗。

chaifa

BI1JNP Thank you for your guidance.

BH4GTG

BI1JNP 请问老师，台风天玻璃钢天线需要收下来吗？家里刚立了根5.2米的，安装极其麻烦，台风天避风有什么好办法伐？

chaifa

80 meters high, what diameter of feed horn should be used for the UV band? Should it be 1/2 inch or 7/8 inch?

BI1JNP

chaifa From a degradation perspective, thicker cables are definitely better, but you need to consider the issue of bends. After entering the room, you'll definitely need to make connections and turns, otherwise it will be very difficult to bend the cable.

BG2EFX

chaifa 80m 1/2 wave antenna ~

chaifa

Senior, I would like to ask you about another option. I want to extend a support structure from the window, and then place an antenna on top of it. Now, I'd like to know how long the support structure should be before extending it outside the wall.

Jason

chaifa For UV, a distance of about 1 meter should be sufficient, perhaps referring to half a wavelength?

BG2EFX

chaifa At least 1 meter ~ 1.5 meters is ideal; 2 meters is best.

chaifa

Thank you for your suggestions and advice from my seniors. I have adopted the suggestion to extend it by 1 meter.

chaifa

One more question: I'm planning to install a vehicle on the outside, and I saw some older HAMs connecting a ground wire under their antenna. Is this UV band useful? If so, could you recommend a good one? Thank you.

BA7IQL

chaifa Ideally, when designing a car antenna for use in your vehicle, you should ground it to the chassis. If you're using it at home, adding an additional grounding point will improve its performance.

BG2EFX

chaifa U don't need V, but you can use shortwave; shortwave must be used with ~.

chaifa

Can you recommend a good online retailer for UV-related products?

chaifa

I'm using a 1/2 wave coaxial cable for my glass fiber antenna. I also want to ask the seniors: When running the cable from the roof to the balcony, the length is approximately 30 meters. The cable hangs down almost vertically (90 degrees) from the roof edge. What's the best way to handle this, especially regarding the right-angle bend at the edge of the roof? I would appreciate any advice from experienced users.

BG2EFX

chaifa Go to a hardware store and buy a flexible hose. Make sure it's durable enough. Since you can't bend it vertically, it will only have some curvature. Anyway... I can imagine that it won't look very nice, and it will probably blow away in the wind.

BG3RZA

I've used 7/8 inch tubing for a few years now, and I really like it!

BH2VYJ

Have you considered using a split-system radio, with the main unit on the top floor and a 1-meter feeder cable plus an 80-meter power cable and an 80-meter network cable?

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