卫星是不是频差都特别大能，直接跨UV的那种啊？打卫星要几单元的八木/增益多少的天线才能打上去？我前些天拿我两单元的U段八木试了一下啥也没听到。 UV双段的八木有没有什么比较便宜的推荐？我看淘宝上动辄大300，实在是有点家境贫寒了。（或者说两部手台一个负责U段一个负责V段会省钱一些吗😥）

有个新问题，感觉频繁占用首页提问不太合适，如果哪位友台看到了希望能回答一下：我发现有一些中继台的上行频率在430以下（即42x.xxxMHz），我的这台泉盛UVK6当发射频率在430以下时会提示“发射禁止”，导致无法再这些中继台上通联，请问有什么解决办法吗？

@"FrankXin"#p81175 卫星的仰角和发射功率都对接收有影响，多数情况下3单元八木就可以了，可以自己用电线等diy麦克森八木效果还不错（如图）我用这个接收sstv和接收卫星中继信号都没有问题。[upl-image-preview uuid=570761e5-e348-4619-8835-e93d2c653e33 url=https://storage.hamcq.cn/2025-10-06/1759737458-593217-75138ba123f4b2a9d24f521122c4242f.png alt={TEXT?}]

@"FrankXin"#p81183 42x.xxxMHz 这个不是业余业务了。是不是交通运输等专用频率？

@"BA8AKU"#p81186 黑中继罢了

@"BA8AKU"#p81184 自己做的话我需要买一个驻波仪吗？

@"FrankXin"#p81209 严格按照图纸尺寸做驻波基本没有太大问题。我做的驻波v段在1.7左右，u段1.3左右。

買個天線分析搓不錯駐波表以後買這樣比較省

@"BA8AKU"#p81215 其实1.7已经有点高了吧好像（思考），想要降低驻波比是不是就是比较专业的知识了

@"BX4AFI"#p81216 天分和駐波是兩個東西啊，我一直以為是一個。總之謝謝

@"FrankXin"#p81175 uvk6有个专门打星的固件，能自动多普勒频移，到k5网站上去刷一下，我试过还算好用

Regarding methods for targeting satellites and antenna selection.

FrankXin

Is it possible for a satellite to have such a large frequency difference that it can directly transmit across the UV spectrum?
How many Yagi antennas (with a certain gain) do I need to use, and what is the optimal number of elements, in order to successfully communicate with satellites? I tried using a two-element Yagi antenna a few days ago, but I didn't get any signal.
Are there any relatively affordable Yagi antennas (Yagi-Uda antenna) that are suitable for UV dual-band operation? I've seen some on Taobao costing over 300, which is a bit too expensive for my budget. Alternatively, would it be more cost-effective to use two handheld radios, with one handling the U band and the other handling the V band?😥）

BA8AKU

FrankXin The satellite's elevation angle and transmit power both affect reception. In most cases, a 3-element Yagi antenna is sufficient. Building your own Yagi antenna using wire and other components can also provide good results (as shown in the figure). I have successfully used this antenna to receive SSTV and satellite repeater signals.

BH6CZW

FrankXin The UVK6 has a firmware specifically designed for tracking satellites, which can automatically perform Doppler shift measurements. You can download it from the K5 website and try it out; I found it to be reasonably effective.

FrankXin

I have a new question that I feel is not appropriate to post repeatedly on the homepage. If anyone can help, please: I've noticed that some repeater stations are transmitting on frequencies below 430 kHz (i.e., 42x.xxx MHz). When my QuanSheng UVK6 transmits at frequencies below 430 kHz, it displays a "Transmission Prohibited" message, preventing me from communicating with these repeaters. Are there any solutions to this problem?

BA8AKU

FrankXin 42 x.xxx MHz – This isn't for amateur use. Is it a frequency reserved for specific applications, such as transportation?

Earth2023-Future

FrankXin 430～440你可以用，420就纯属黑中继了，别用xd
要打卫星的话u2v2也不是不可以（不过现在军备竞赛越来越严重了，大家都是大功率+U7V4起步），如果觉得jyr那些卖的天线贵了的话，可以自己尝试搓一个，网上我记得有教程（不过有些u5v3也够用哦ovo）

FrankXin

BA8AKU If I build it myself, do I need to buy a standing wave tube?

BG2GZW

BA8AKU Could you please provide a simpler solution?😅

BG5ELQ

BA8AKU The black repeater is out of service.

BA8AKU

FrankXin The dimensions in the diagram are strictly followed, and there shouldn't be any major issues with the standing wave. The standing wave I created for the V-band is around 1.7, and for the U-band, it's around 1.3.

FrankXin

BA8AKU Actually, 1.7 seems quite high, doesn't it? (Thinking) If I want to reduce the standing wave ratio, that requires more specialized knowledge.

BX4AFI

Buying a spectrum analyzer is a good investment. After that, you can buy an antenna analyzer. This will save you money in the long run.

FrankXin

BX4AFI Talent and standing waves are two different things; I always thought they were one and the same. Thank you anyway.

BD3QID

FrankXin Slightly higher than ideal, but still adequate.

BA8AKU

FrankXin If I need a better VSWR, I will make small adjustments while measuring. I'm planning to build a portable Yagi antenna.

BA8AKU

BG2GZW The Maxon setup is relatively simple; you can easily set up a single U-segment with either 3 or 4 units for everyday communication.

ping

What are the characteristics of a lactic acid bacteria dual-stage Yagi antenna? The Yagi antenna I'm currently using is a Yagi-Uda antenna, but due to my location, it hasn't yet been tracked by satellites.

BD3QID

ping The RSJ Yagi antenna used to perform well, but recently the satellite environment has deteriorated, and it may be experiencing some performance issues.

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