纯新手，端馈天线比较隐蔽，感觉搭建的可能性比较大，不会像GP之类的被投诉。想问下大家端馈天线效果如何？好用吗？和5米的GP天线比呢？欢迎大家贴出自己的端馈图片和通联成果。73

能用别的如正 V 就尽量别用端馈

@"BG2ELG"#p31357 正V比端馈强多少呢？

架设高度足够的端馈增益比GP好，但你需要能够理解怎么样消除不平衡天线带来的射频干扰（其实就是馈线套扼流环）。端馈可以斜拉，可以水平架设，也可以倒V架设。当然你需要一个VNA来根据不同的架设方式进行调整。至于通联效果，我用5瓦ft8差不多完成100 DXCC，最远乌拉圭巴西阿根廷啥的

我这个长线+天调也可以算端馈吧。效果还可以。 [upl-image-preview url=https://storage.hamcq.cn/2024-08-30/1724999142-324936-mmexport1724572088429.jpg]

@"BD7JIR"#p31436 野架啊，羡慕，不过你这个绳子怎么搞到树上去的？

@"BG7NOD"#p31461 矿泉水瓶子绑好，扔上去。线天线不占地方，40米-6米波段都能调谐，不用带天分，耳朵听底噪就能知道是否调谐了。爬山一个背包里还能放吃的、喝的。

@"BD7JIR"#p31436 印章键好评

@"BD7JIR"#p31436 我也是818，端馈天线，14兆驻波完美，携带很方便

What are your thoughts on end-fed antennas? Experienced users, please share your insights.

BG7NOD

I'm a complete beginner, and I think using a ground-plane antenna is more discreet than other options. It seems like it would be less likely to attract complaints compared to systems like GP. I was wondering how others have found the performance of ground-plane antennas? Are they effective? How do they compare to 5-meter GP antennas? I'd also appreciate it if you could share your own pictures and results using ground-plane antennas. 73

BG2ELG

Whenever possible, avoid using end-fed antennas like the "Z" antenna.

BG7NOD

BG2ELG What is the difference in power between the positive and negative ends?

Lynx

The gain ratio of the feed line is good, but you need to be able to understand how to eliminate RF interference caused by unbalanced antennas (i.e., using a choke loop on the feed line).
The antenna can be mounted in a slant, horizontal, or inverted-V configuration. Of course, you will need a VNA to adjust it based on the mounting method.
Regarding the performance, I achieved approximately 100 DXCC using a 5-watt FT8 setup, and was able to contact stations in Uruguay, Brazil, Argentina, etc.

BG7NOD

Lynx Wow!

BD7JIR

Even with my long-term and weather-dependent setup, I can still achieve some degree of directional gain. The results are acceptable.

BG7NOD

BD7JIR Wow, that's amazing! I'm so jealous, but how did you get the rope up to the tree?

BI9BLG

BD7JIR Positive review of the stamp key.

BI9BLG

BD7JIR I also have the 818, with a direct-to-ground antenna, and it achieves perfect 14 MHz standing wave. It's very convenient to carry around.

BD7JIR

BG7NOD Secure the water bottle, then throw it up. The antenna doesn't take up much space and can tune to frequencies between 40 meters and 6 meters. You don't need a separate antenna; you can simply listen with your ears to determine if it's tuned correctly. A backpack on a hike can also hold food and drinks.

BG7NOD

BI9BLG Positive review +1

BG7NOD

BI9BLG I set up a downlink, with a frequency of 14 MHz, which is slightly higher than ideal. The center frequency is 14.8 MHz, and the VSWR to 14.275 MHz is 3.36, but the built-in attenuator can easily bring it down.

BI9BLG

BG7NOD Yes, I was the first shortwave station using direct-to-home (DTH) transmission, and I used all the common frequency bands through resonance. DTH is the preferred method for rooftop installations, and there are many challenges associated with GP or vertical antennas.

BG4TRF

The transmission efficiency is very low, and the noise level is also high, making it suitable only as a receiving antenna.

BG7NOD

BG4TRF So, even after adjusting the standing wave, it didn't work?

dxs660

BG7NOD "The effect of the buffer is just the buffer itself, and it's not related to the background noise. Of course, the first thing to address with a buffer is whether there are any problems. The specific results also depend on the setup environment, which is why some people say it works well, while others say it doesn't."

BG7NOD

dxs660 Of course, the Q value and fundamental frequency have nothing to do with the noise floor. However, I'm wondering if, given that you mentioned low transmit efficiency and a very low Q value, the transmit efficiency would also be low?

BG2KAJ

BG7NOD
Consider a dummy load, perfect 50-ohm impedance, standing wave ratio of 1, and transmission efficiency of 0.

BG7NOD

BG2KAJ That's because all the energy was converted into heat and dissipated, so the launch efficiency would naturally be close to 0.

BG2KAJ

BG7NOD
What I mean is that the standing wave and transmission efficiency don't matter; you can't ask questions like that.

BG2EWI

BG7NOD 你就说驻波低不低吧😋

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