刚刚整了个box6，目前有两个计划，一个是GP，一个是正V，使用条件为室内靠窗或阳台，学校操场（草坪感觉不能插地钉），由于比较穷，动手能力又比较强，打算自制，现寻求各位大佬的建议

都自制了来个三单元八木！（雾）六米的天线跟短波比起来很小所以个人建议正V＞GP

GP效率低了，首选正V，而且得保证够高，6米波段因为存在偶发的异常传播，更适合FT8长期挂机挖矿，建议配一个低功耗小主机7x24跑着

关于正V：需要手搓一个巴伦，于是另一个问题又出现了，NXO100的磁环似乎只能用于15Mhz，国外的磁环也买不起，所以这个应该如何选择呢

@"hml"#p94056 建议买成品巴伦手搓正V吧

https://www.qsl.net/dk7zb/6m/312.htm 6米3单元八木的网站，可以参考

@"hml"#p94056 买成品来手搓

6m这种其实更加看天说话，需要稳定的7*24监控而不是偶尔架设看看。在城区环境最主要的一点就是隐蔽性和高空安全性，个人觉得好方法就是在窗户上用漆包线拉efhw，因为窗框的近场所以实际长度2m左右驻波就接近1了，实际辐射效率未知，全成谜。但是我现在这么做在6m已经基本除了北美和南极其他州都连过了，尽量别用现成的端馈变压器，那都是对hf优化的，磁环可能要用52或者62材料，匝数你要布置好天线以后跟着网分走，比如我现在就是25：1的而不是常规49或者64。当然这这并不是最优解，但是是长期可行几乎免维护的办法，变压器甚至可以放在室内，让振子在馈电点附近套着特氟龙过窗户缝出去，这里辐射最小对效率影响不大。另外虽然dx极化会有随机旋转，但是这种拉法几乎大部分都是水平分量，基本符合dx的约定俗成。对了，一定要多加choke，这种方式其实emi是很大的，最好接收机到电脑也加usb隔离器。

都自己做电台了，其他还有难度？除非是买的人家做的冒充自己DIY。

6米要想玩得舒心还得是八木，不然就很容易出现虽然pskreporter上显示传播打开了、但是自己掏出电台架好天线一看是白板的情况。

@"hml"#p94049 基于“比较穷”这个关键词，可以试试我们小时候用过的“剥皮天线”。大概是，找一段同轴馈线，因为用的是卜仔六，功率很低，所以馈线粗细无所谓了，-3、甚至-1.5的都可以。馈线长度在5米以上，其中有3米用于后面的天线只做，2米用来从天线端接到卜仔六。把馈线一端的塑料外皮，剥去大概1.42米，露出的屏蔽网，用手慢慢搓搓搓揉揉揉，把它反套回后面的馈线外皮上，套得是否漂亮，就考验你的手艺了。然后用一段热缩管套到屏蔽网上，加热套紧。也可以用电工胶布包。馈线的另一端做上接头，这样一条偶极天线就做好了。可以水平架设，也可以直立架设。

Regarding the selection of antennas in the 6-meter frequency band.

hml

I just finished building a Box6, and I currently have two plans: one is GP (presumably referring to a specific configuration), and the other is a standard V. The conditions for use are indoor, near a window or balcony, and school sports field (the grass area cannot support ground-mounted installations). Because I'm on a tight budget and have good DIY skills, I plan to build it myself. I would like to seek advice from experienced users.

BA7NQ

hml Based on the keyword "very poor," you could try using a "skinning antenna" that we used when we were children.

It's likely that I need a coaxial cable, because I'm using the "Buzi Six" which has very low power. Therefore, the thickness of the cable doesn't really matter; -3 or even -1.5 dB attenuation is acceptable.

The cable length is greater than 5 meters, with 3 meters used for the antenna and 2 meters used to connect from the antenna end to the "Buzi Six".

Remove approximately 1.42 meters of the plastic outer shell from one end of the cable, and carefully wrap the exposed shielding mesh back around the outer shell of the other end of the cable, ensuring it is neatly wrapped. This tests your skill. Then, use a heat-shrink tube to cover the shielding mesh, and tighten it with heat. Alternatively, you can also use electrical tape to wrap it.

The other end of the cable is connected to a connector, resulting in a complete dipole antenna. It can be mounted horizontally or vertically.

BG2GFC

I've made them all myself. How about a three-element Yagi antenna? (Haha)
Compared to shortwave radio, a six-meter antenna is quite small. Therefore, I recommend using a vertical antenna (V) over a GP antenna.

BG7PXE

The GP efficiency has decreased, so the preferred option is a strong V. It's important to ensure it maintains sufficient performance. The 6-meter band is suitable for long-term FT8 operation due to occasional propagation anomalies. I recommend pairing it with a low-power, small computer that runs 24/7.

hml

Regarding the "real" version (V): I need to manually create a barrel, but that brings up another problem. The NXO100's magnetic ring seems to only work at 15MHz, and I can't even afford to buy one from overseas. So, how should I choose?

BG7PXE

hml I recommend buying a finished Baron hand-rolled vape.

BG2GFC

hml Buy a finished product to make by hand.

BH8GCJ

hml Actually, I have a 1:1 current-type balun that I made myself using an NXO100 toroidal core and enameled wire (a product from a friend in the 6th district). I then used a NanoVNA to measure its S21 Logmag over the past few months, and the results are shown below (blue line).
I think a 6-meter length might be usable (?).

bg7xwf

https://www.qsl.net/dk7zb/6m/312.htm
You can refer to the website for a 6.3-meter Yagi antenna.

bg7nzl

This 6m antenna is designed to primarily transmit and receive, requiring a stable 7x24 monitoring system rather than occasional setups. A key consideration in urban environments is concealment and high-altitude safety. I believe a good approach is to use coated wire (efhw) on the window frame, as the close proximity of the window frame results in a standing wave length of approximately 2m, which is close to the optimal value for this frequency range. The actual radiation efficiency remains unknown, making it difficult to assess performance. However, I have successfully connected this setup over North America and Antarctica using this method, avoiding commercially available antenna tuners whenever possible. These tuners are optimized for HF frequencies, and the ferrite core may require 52 or 62 material. The number of turns should be determined based on your antenna design and then followed by the network division. For example, I am currently using a 25:1 ratio instead of the standard 49 or 64. Of course, this is not the optimal solution, but it is a long-term, practically maintenance-free approach. The transformer can even be placed indoors, with the coil extending through the window frame near the feed point, minimizing radiation and having minimal impact on efficiency. Additionally, while DX polarization may exhibit random rotation, this method produces primarily horizontal components, which generally conforms to the standard DX configuration. Finally, it is important to use multiple chokes, as this setup can generate significant EMI. It is also recommended to add USB isolators between the receiver and computer to further reduce interference.

ba7ck

Is it difficult for everyone to set up their own radio stations, or are there other challenges? Unless someone buys a pre-made station and pretends they built it themselves.

Liridice

To enjoy using a 6-meter antenna comfortably, a Yagi antenna is definitely the best choice. Otherwise, you're likely to encounter situations where the PSKReporter shows that propagation is open, but when you set up your own antenna and radio, you find that it's not working.

BG7NOD

It seems like there are other sellers offering similar products for around 100 yuan, which isn't expensive. However, the 6-meter band single-sided antenna is only 1.5 meters long, and the overall size isn't very large, so it might be suitable for use in a small space. There are also some sellers offering them for 299 yuan.

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