Regarding methods for targeting satellites and antenna selection.

FrankXin

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😥）

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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