前几周做了一根 5.2 米的拉杆 GP 天线，目前可以在 14-50Mhz 稳定驻波 1.5 以下，手边又多出来的漆包线所以就想问下如何自制加感线圈，想做一个 7Mhz 的来用。同时：求教一下各位加感线圈的匝数直径与工作频率和铜线直径有什么关系吗？

不知道，但是我的qsl卡将在明天发送到您（x）

我做过。用下水道管子做的。材料费用大概50元。但是后来拆了。拉杆天线不在加感线圈中间，而是在旁边。不影响数据。一般人无法准确计算电感量。只能通过跳线测试线圈长度。

漆包线绕PVC水管粗细看你的发射功率 40m加感5.2m拉杆的话经验所得一般1.2*5=6m左右的漆包线绕完用VNA慢慢裁出谐振点

How to make a GP coil with a sensing wire.

BA7OGM

A few weeks ago, I built a 5.2-meter long dipole antenna and it's currently maintaining a SWR of less than 1.5 across the 14-50 MHz band. Since I have some extra coaxial cable lying around, I was wondering how to build a matching coil to use with it, specifically for 7 MHz.

Additionally: Could you please advise on the relationship between the number of turns, diameter, and working frequency of the inductor coil, as well as the diameter of the copper wire?

VR2WBZ

I don't know, but my QSL card will be sent to you (x) tomorrow.

BI9BOH

I have done that before. I used PVC pipes for it. The material cost was about 50 yuan. However, I later removed it. The pull-out antenna was not in the middle of the coil, but on the side. It didn't affect the data.
Most people cannot accurately measure inductance. They can only determine the length of the coil by using jumper wires.

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