如果你在城市南面边缘，你要通联的电台在城市北方很远的地方，那么这座城市的不良电磁环境会阻碍到你信号的发射和接收吗？如果你在城市北面边缘，你要通联的电台在城市北方很远的地方，那么这座城市的不良电磁环境会阻碍到你信号的发射和接收吗？

@"BA7MTH"#p24982 城市内没经过电离层反射就是地波传播吧，就跟uv段差不多了：如果天线都在高处没啥遮挡效果估计可以，如果成市中间都是高楼，那效果就会大打折扣了

[upl-image-preview url=https://storage.hamcq.cn/2024-07-27/1722063566-85187-img-20240727-145848.jpg] 如图，D点远离城市肯定是电磁环境最好，那么 C 和 A 要通联北方城市有区别吗？B 要通北方城市肯定是最差的了吧

国内这个电磁环境，听得见就不错了，还要求这样高？！偷着乐吧你就

@"BA7MTH"#p24982 目前人类科技树尚未解锁技能【电磁幕】

基本上我一进入地图上人流红色的地方SSB就消失了

Will urban areas block shortwave signals?

BA7MTH

If you are located on the southern edge of the city, and your radio transmitter is far to the north, will the city's poor electromagnetic environment interfere with the transmission and reception of your signal?
If you are located on the outskirts of the city, and the radio station you need to communicate with is far north of the city, will the city's poor electromagnetic environment interfere with your signal transmission and reception?

BG6HFD

BA7MTH If the signal doesn't pass through the ionosphere and propagates as a ground wave, it would be similar to signals in the UV band. If the antennas are located high up with minimal obstructions, the effect should be good. However, if the area is densely populated with tall buildings, the effect will be significantly reduced.

BI1NIZ

BA7MTH Currently, human technology has not yet unlocked the skill 【Electromagnetic Barrier】.

BG2EFX

There's something called "ground wave".

BA7MTH

As shown in the figure, point D, located far from the city, would definitely have the best electromagnetic environment. Then, do points C and A need to be connected to northern cities? And wouldn't point B, with its connection to northern cities, be the worst?

BH7CNC_Jack

The electromagnetic environment here in China is already quite good, but they still require it to be this high? Well, I guess that's just how it is.

SuoYuC

You are blocking my signal.

BA7MTH

Basically, as soon as I enter an area on the map with high pedestrian traffic (indicated by red), the SSB signal disappears.

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