天线种类：石家庄mkGP天线改进前：使用对应波长匹配的线型地网，按照对应数量进行架设改进后：使用2x1.5米电磁屏蔽布做地网，效果情况：亲测20波段以上，业余段全段驻波不超过1.3，40米波段可能是由于屏蔽布尺寸过小导致驻波下不来 [upl-image-preview url=https://storage.hamcq.cn/2024-11-01/1730454713-553142-image.png] [upl-image-preview url=https://storage.hamcq.cn/2024-11-01/1730454725-904830-image.png] [upl-image-preview url=https://storage.hamcq.cn/2024-11-01/1730454737-976408-image.png] [upl-image-preview url=https://storage.hamcq.cn/2024-11-01/1730454764-274814-image.png] [upl-image-preview url=https://storage.hamcq.cn/2024-11-01/1730454779-947239-image.png] [upl-image-preview url=https://storage.hamcq.cn/2024-11-01/1730454801-554094-image.png] [upl-image-preview url=https://storage.hamcq.cn/2024-11-01/1730454815-775283-image.png] 优点：铺设方便缺点：目前上面上找不到更大尺寸的屏蔽布纯技术方面的不多说，我这个水平就是班门弄斧，但从使用感受来说，gp天线的架设从来没有这么方便过。有什么好的想法欢迎评论区留言。

期待更多细节，比如用鳄鱼夹连接么？屏蔽布拼在一起能改善40米波段的驻波么？

[upl-image-preview url=https://storage.hamcq.cn/2024-11-02/1730550541-508282-image.png] [upl-image-preview url=https://storage.hamcq.cn/2024-11-02/1730550631-224227-image.png] [upl-image-preview url=https://storage.hamcq.cn/2024-11-02/1730550671-426267-image.png]

买四块屏蔽布，架设的时候用地锚一串四穿过四片布的角，拓展一下大小，也许会有用？

经过测试，21兆信号到达阿根廷，-17，r-19，以下是群友提供的spot网站信息[upl-image-preview url=https://storage.hamcq.cn/2024-11-04/1730683425-938290-image-1144680274390211.jpg]

测试地点CN-0055，时间2024年11月2日，下午3-5点

你需要再架设一个常规的GP做AB切换才能知道效果是好了还是差了

可以用铜、铁窗纱做这个地网的原理是半径1米内的射频接地电流密度最大，是可行的

Experiments on improving shortwave GP antenna ground network

BH3XZT

天线种类：石家庄mkGP天线
改进前：使用对应波长匹配的线型地网，按照对应数量进行架设
改进后：使用2x1.5米电磁屏蔽布做地网，
效果情况：亲测20波段以上，业余段全段驻波不超过1.3，40米波段可能是由于屏蔽布尺寸过小导致驻波下不来

优点：铺设方便
缺点：目前上面上找不到更大尺寸的屏蔽布
纯技术方面的不多说，我这个水平就是班门弄斧，但从使用感受来说，gp天线的架设从来没有这么方便过。
有什么好的想法欢迎评论区留言。

BI1NIZ

BH3XZT 回收二手孕妇防辐射服.....

BH3XZT

The images from the site will be added later.

BG5VQE

It seems like a good approach.

Liridice

I'm looking forward to more details, such as whether alligator clips can be used for connection? Would combining shielding fabric improve the standing wave in the 40-meter band?

BH4GQD

This looks good.

BH3XZT

BH2VZC

I want to buy four pieces of shielding fabric. When installing them, should I use ground stakes to secure them in a line of four, passing through the corners of each piece? Would that help expand their size and potentially improve their effectiveness?

BH3XZT

After testing, a 21 MHz signal reached Argentina, with -17 dBm and an S/N ratio of r-19. The following is information about the spot website provided by group members:

BH3XZT

Test location: CN-0055, Date: November 2, 2024, Time: 3 PM - 5 PM

Lynx

You need to set up another standard GP for A/B testing in order to determine whether it's working correctly or not.

BG2KAJ

It can be made with copper or iron window screens.
The principle of this ground network is that the maximum RF grounding current density within a radius of 1 meter is feasible.

BH3XZT

BG2KAJ There's a problem: the standing wave in the 40-meter band is not going down, as shown in the diagram above, it's at least 1.6, and I'm considering whether this is because the shielding area is too small or the ground reflection is insufficient, which prevents the standing wave from decreasing.

BG2KAJ

BH3XZT You can try increasing it a bit, but I think 1.6 is sufficient for field use (）.

BH3XZT

Actual experience with the "野架" (Wild Rack):
1. Easy to install/set up
2. Easy to adjust
3. The shielding material can be folded and used as a protective layer for devices such as computers during travel to remote locations.

BH7HQT

I've installed a mosquito net for the windows, and I'll try using it on the hammock next time.

Liridice

There's a photography prop called "cloud gauze net" that is softer and holds its shape better than sheer curtains. I plan to get some of these to improve the appearance of my air conditioner unit's outdoor casing.

BG8AMG

Stainless steel mesh, buy thin ones, use two 2x4 sheets together to make a 4x4.

BH3XZT

Regarding the location where the shielding fabric is attached, this five-claw clamping buckle is used. One end clamps onto the shielding fabric, and the other end clamps onto a wire.
When using, ensure the latch is securely closed.
The other side of the wire end is welded with a copper tip.

BG8AMG

BH3XZT Considering that this antenna is essentially a dense shortwave network, to address low-frequency bands, it can be supplemented with additional ground wires around the antenna.

BH3XZT

BH3XZT 选择五爪按扣时需要注意，带颜色的按扣上有油漆绝缘，不要购买，，另外目前正在考虑使用铜箔带
或者锡纸胶带

外加大力布基胶带结合的方式，加固红框处的链接位置

这种贴胶带的方式有点类似于磁吸地网的感觉了

BH4GTG

I tried the method described by the original poster, and the best results I achieved were using both a ground wire and a shielded fabric simultaneously. Also, the shielded fabric doesn't need to be very large; something around 1.5 x 1.5 might offer the best value for money.

BH3XZT

BG8AMG 后续可以试一下，在屏蔽布四周加上排线，不过一般出门野架时白天居多，14兆以上的波段达到要求也就够了，需要考虑的是这个屏蔽布gp的效率怎么样，这个是不确定的

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