目前很多朋友认为禁U是要发展低空经济。但是其实未必。可以看下这篇《上海市经济和信息化委员会关于规范有关业余业务频率使用的通知》（https://www.sheitc.sh.gov.cn/qtlb/20241203/457845ee1fd948c48a519f16fad06341.html）如果为了发展低空经济，失去的430-440MHz和146-148MHz其实无伤大雅，尤其146-148基本上没见用过，无非就是新手入门更难了一些罢了，相比经济的发展，这些我们可以抛弃，但是很明显这个理由并不充分。 1800-2000 kHz 5351.5-5366.5 kHz 10100-10150 kHz 这些是中波频段，低空经济会用到这么鸡肋的频率吗？不说你要架多大的天线，这些频率带宽真的够用吗？那些高频段兴许人家能用到，就不吐槽了，用就用去吧。上海浙江的朋友们要和其他业务和平共处，任重道远。事情看起来没有这么简单。

一直没搞明白，低空经济到底用的哪个频率？真的用430-440和146-148了吗？

有关注到5351.5-5366.5 kHz 10100-10150 kHz这两段频率在某市(非浙江及上海)也禁用，引用当地对外答复。 > 135.7-137.8kHz、5351.5-5366.5kHz、10100-10150kHz，以及大于1GHz的主要业务的使用单位为重要敏感部门，为避免设置、使用的业余无线电台对同频段主要业务无线电台（站）产生有害干扰，影响其无线电业务正常开展，暂不予许可上述业余业务和卫星业余业务为次要业务的频段。

@"BG5EGC"#p50865 在这个某市外30米波段发射，也是有可能影响到他们的。毕竟无线电波从四面八方来🤔

反正他们能当李白，你要想当李白？你懂的！

@"BG5BJM"#p50871 确实是，但是也没法深入去了解里面的具体原因，单就爱好者来说能争的争一下，争不下来的只能依规合法玩了~

某ham在某波段通联，此时某部：“报告！前方有电子干扰！” “是怎么回事？派出电子侦察机和电子干扰船，查明情况！”

上海代表不了全国吧。。。。

@"hliang_BH2WDQ"#p51934 星星之火可以燎原

@"UmenShiro"#p51940 可别了。。。这真不是啥好事儿。。。管的都是合法拿证的，非法手台随便用。。。工地、酒店、雪场。。。。脑壳儿疼。。。。

Regarding "no-U," the situation may not be as straightforward as it seems.

BD3QID

Currently, many friends believe that banning U is necessary for developing low-altitude economy. However, this may not be the case. You can refer to this article: "Notice on Regulating the Use of Amateur Radio Frequencies by the Shanghai Municipal Committee of Economy and Information Technology" (https://www.sheitc.sh.gov.cn/qtlb/20241203/457845ee1fd948c48a519f16fad06341.html）
If developing low-altitude economy requires sacrificing the 430-440MHz and 146-148MHz bands, it's not a significant loss. In particular, the 146-148MHz band is rarely used, so losing it would only make it slightly more difficult for beginners. However, this reason is not sufficient.
1800 - 2000 kHz
5351.5 - 5366.5 kHz
10100 - 10150 kHz
These are the VHF frequencies. Would low-altitude economic applications really use such a "useless" frequency? Not only do you need to consider how large an antenna you'll need, but are these frequencies and bandwidth actually sufficient? If they can use higher frequencies, then that's fine. Just use them if they work for them.
Friends in Shanghai and Zhejiang need to coexist peacefully with other businesses, which is a challenging task. The situation appears more complex than it initially seems.

BG4IJK

I've never been able to figure out which frequency is used for low-altitude economic activities. Are they actually using frequencies between 430-440 and 146-148?

BG5EGC

I have also noted that frequencies in the range of 5351.5-5366.5 kHz and 10100-10150 kHz are also prohibited in a specific city (not Zhejiang or Shanghai), as evidenced by local responses.

The primary business frequencies of 135.7-137.8kHz, 5351.5-5366.5kHz, and 10100-10150kHz, as well as those above 1GHz, are reserved for important sensitive departments. To prevent amateur radio stations from causing harmful interference to primary business radio stations (stations) in the same frequency band, which could disrupt their normal operation, these frequencies are not currently permitted for secondary business and satellite amateur business operations.

BG5BJM

BG5EGC This transmission, operating in a 30-meter band and originating outside the city, could potentially affect them. After all, radio waves come from everywhere.🤔

BD3QID

BG5EGC Haha, I see which city it's from.
It seems quite absurd that important and sensitive departments would use "248-250 GHz."
I just find it too much effort.

BG5EGC

BG5BJM

That's true, but it's also impossible to delve deeply into the specific reasons behind it. For enthusiasts, there might be room for debate and disagreement, but ultimately, they have to abide by the rules and play legally.

BG8KUQ

Chongqing doesn't have "u". I'm used to it.

BG8LGP

One ham radio operator reported a connection in a specific frequency band. At that moment, another operator said: "Attention! There is electronic interference ahead!" "What's happening? Send out an electronic surveillance aircraft and an electronic jamming ship to investigate."

BG5ELQ

10100-10150 KHz 频段中主要业务为武警、公安、应急（地震）等重要敏感部门。

hliang_BH2WDQ

Shanghai cannot represent the entire country, can it?

UmenShiro

hliang_BH2WDQ A single spark can start a large fire.

hliang_BH2WDQ

UmenShiro No, no... this isn't a good idea at all...
Only those with legitimate licenses are allowed to use radios; unlicensed users can use them freely.

Construction sites, hotels, ski resorts... my head hurts.

BH6AGP

hliang_BH2WDQ Operating without a license incurs high enforcement costs. If you have a license, they can record audio to establish evidence, verify your call sign, and then contact you for verification. After that, the regulatory authority (No委) will take action against you.

BG5ELQ

BD3QID If you want to know, I'll tell you.

The primary business is radio astronomy in the 248-250 GHz frequency band, and it is currently used in Delingha City, Qinghai Province; Lhasa City, Tibet Autonomous Region; Gyatse County, Shigatse City, Tibet Autonomous Region; and Yang Eight Well Town, Qitai County, Xinjiang.

BG5ELQ

BD3QID Shanghai also doesn't prohibit 248-250 GHz, and neither does Zhejiang.

BD3QID

BG5ELQ There are actually people who still use it, possibly because of the proximity to the Miyun Astronomical Observatory, although he didn't mention that.

BG5ELQ

5.149 When assigning frequencies to other services already allocated to the following bands: Urge relevant authorities to adopt all practicable measures to protect radio astronomy from harmful interference. Transmissions from space-based or airborne radio telescopes can be a particularly severe source of interference for radio astronomy (see sections 4.5 and 4.6, and paragraph 10).
Article 29).（WRC-07）
In fact, a city (other than Zhejiang and Shanghai) can use the 23 cm band, and 5.149 GHz does not require 1296.

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