短波天线不拉开给uv通联用合适吗天线最重要参数是什么，怎么判断天线是否合适频率通联？禁U了，我的手台天线能接收V 但打不出去手台天线测V段驻波偏高

拉杆天线本身就可以调节到UV段的合适长度，作UV段天线没有问题的。

gp或者dp这种，每个振子拉到四分之一波长就行了，考虑到5.6米拉杆全部收起来都有50多cm，可能全部收起来也会太长？总之肯定能用，但是可以考虑换成短一点的拉杆🙃

天线长度拉到U/V段的四分之一波长（好像二分之一也行）的整数倍附近都能有谐振峰，很多利用高次谐波实现多个波段共用一副天线都是这个道理。实测正V偶极天线加了两根5.6m拉杆调整好长度能在2m波段正常收发，驻波可观，拿来玩个144.174MHz的FT8也不错

@"Prologue"#p90292 拉 1/2 波长是驻波最高的地方（

@"BI1XJT"#p90518 得看天线类型来着，偶极天线是1/2，单极天线是1/4，感谢指正。

I used a network analyzer to measure the UV standing wave of my short dipole antenna. The result was approximately 1.1.

wdham

The shortwave antenna doesn't seem to be working properly. Is it suitable for use with UV Communication?

What are the most important parameters of an antenna? How can I determine if an antenna is suitable for the desired frequency and communication?

I've disabled U, and my handheld antenna can receive V, but I can't transmit. The handheld antenna measures a high standing wave in the V frequency range.

BH3HMP

The telescoping antenna can be adjusted to the appropriate length for the UV spectrum, and therefore functions perfectly as a UV-specific antenna.

BD7PPA

For either GP or DP, you only need to pull each coil to a quarter wavelength. Considering that pulling the entire 5.6-meter cable completely retracts to about 50cm, it might be too long even when fully retracted. However, it definitely works, but you could consider using shorter pull cables.🙃

Prologue

You can achieve harmonic resonance peaks when the antenna length is close to a multiple of one-quarter or one-half wavelength in the U/V band (e.g., a multiple of two). The principle behind using higher harmonics to share a single antenna across multiple bands is the same. For example, I successfully used a vertical dipole with two 5.6m extension rods to achieve normal transmission and reception in the 2m band, with a noticeable standing wave. It's also suitable for experimenting with FT8 on 144.174 MHz.

BI1XJT

Prologue The 1/2 wavelength corresponds to the location of maximum standing wave (

Prologue

BI1XJT It depends on the type of antenna; a dipole antenna is 1/2 wavelength, and a monopole antenna is 1/4 wavelength. Thanks for pointing that out.

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