各位，我一直有个疑问，车台天线和玻璃钢天线，到底有哪些本质上的区别？固定台适合用哪种？比如，钻石X50和钻石SG7900对比，长度相似，X50自带地网，7900没有，增益上7900更好一点等等区别。所以，为什么会有车台天线和玻璃钢天线两种产品线？各自特点和优劣是什么？真心请教。

@"Gintoki"#p23445 受教了！顺便还想了解下： 1. 对UV段来说，地网的作用是什么？是利于发射还是接收？ 2. 对于固定台来说，更适合玻璃钢还是车台？再次感谢！

@"BH4GUW"#p23455 地网的作用主要是降低驻波吧，驻波越低越利于发射。固定台的话肯定是玻璃钢天线更好啦，这一点是圈内人都认同的

车苗是为了便于适应各种驾驶环境。。。你玻璃钢总不能撅折了吧

车载天线是变相的DP天线，增有限。你看到的大增益波瓣不理想。玻璃钢天线是共线天线，由n个5/8波长的振子串联而成，单u段是n段芯连皮，皮又连芯的馈线连接的，增益大，波瓣集中。固定台选玻璃钢无疑，车载是为了便携而做出了性能妥协

Advantages and disadvantages of vehicle-mounted antennas and glass fiber antennas

BH4GUW

Hello everyone, I have a question: what are the fundamental differences between vehicle-mounted antennas and glass fiber antennas? Which type is best suited for a fixed mount?
For example, when comparing the Diamond X50 and the Diamond SG7900, they have similar lengths, but the X50 has a built-in ground net, while the SG7900 does not. The SG7900 also offers slightly better performance in terms of gain.
So, why are there two product lines: car-mounted antennas and fiberglass antennas? What are their respective characteristics and advantages/disadvantages?
I would really appreciate your advice.

Gintoki

BH4GUW
说一下我浅显的见识：
车载天线要配合吸盘或者夹边固定在车上，以车作为地网，这样才能使天线达到最好的工作环境。

玻璃钢天线本质上是可以省略地网或者接三根小的阵子就能当地网的，所以一般是基地台用的多。

车载天线，本身材质是不锈钢，构造很简单，耐造，因为就是一根不锈钢棍子，裁剪到固定长度，在某些地方绕个线圈加感。即使天线撞了，什么东西被弯曲扭曲了，也能恢复原状继续用

而玻璃钢前线内部好像是需要使用馈多节馈线，让屏蔽层和中心层互相连接做出来的比较脆弱，所以外面会使用一层硬壳包裹住。因此玻璃钢适合用在静止的环境中。

说的不一定对，以上是我的理解

BH4GUW

Gintoki Thank you! I would also like to inquire about:

What is the function of a ground plane in the UV segment? Is it for transmitting or receiving signals?
For a fixed pedestal, is it better to use glass fiber or a metal frame?

Thank you again!

Gintoki

BH4GUW The primary function of the ground network is to reduce standing waves, and lower standing waves are beneficial for transmission.
When it comes to fixed masts, fiberglass antennas are definitely the better option, and this is a consensus among industry professionals.

BG2EFX

Fixed-mount, Glass Fiber Reinforced Plastic (GFRP)

BG2EFX

The car's steering column was designed to be adaptable to various driving environments... You can't expect your fiberglass steering column to bend or break, right?

BI9BOH

The vehicle antenna is a Doherty type antenna with a gain of X dB. The large gain lobe you see is not ideal.
A glass fiber antenna is a lumped-element antenna, consisting of an n-section, 5/8 wavelength resonant circuit connected in series. Each section consists of a core and a jacket, with the feed line connecting the core to the jacket. This design provides high gain and concentrated radiation patterns.
Fixed-location selection of glass fiber is undoubtedly the best choice, while mobile units compromise on performance for portability.

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