自从2025年底无线电执照下来以后，我这个新ham几乎每天都在通联呼叫，不过我发现随着天气越来越冷，v段（坐标上海）的传播状况区别非常非常大，甚至在一天之内，都能呈现很大的区别，年底有时候在地面高度，用杂牌的长拉杆天线就能够以58的信号流畅打到中继，但是在今天晚上2度的气温和污染的空气环境，我站在5楼天台，用钻石770天线几乎都无法打到中继了，大家能否分享一些经验和解答

我感觉有是有，但很小雨稍微大点时候u段有点衰减的，v段影响不是很大

这个影响可能不在传播上，而是在中继台上，现在大部分中继的差转依靠的是模拟器件，其中有个关键零件水桶电容，非常容易受到温度的影响，导致回波出行频偏。个人浅见仅作抛砖引玉，如果说的不对欢迎批评和讨论

会不会在你当时这个条件下杂牌拉杆天线比770效率更高，用同样的天线再对比呢？地面和天台的传播路径上都有没有遮挡呢。这种距离下天气的影响应该微乎其微吧😄

[大气波导的异常传播介绍](https://www.dxinfocentre.com/propagation/tr-modes.htm)

感觉雷暴的时候u段传播变得更好了

有时候阴天，v段有可能通联更远

@"BG5FUM"#p92902 感觉有可能是这个原因

个人也有些见解根据我个人实测，在夏天的六楼高度 22点左右用车台的棒杆打100KM外的中继信号良好但一旦到冬天就连用上CJU这种定向的天线也没办法收到回波😅

确实有这种情况，我遇到过雨天连上了平时连不上的中继，但是只连上了几秒

还有个情况如果天气很差你们的中继管理员会把中继关了这个时候是谁都打不通的，并不是传播原因造成的...

The effect of weather conditions on UV transmission.

BI4BEC_sanshou

Since I got my amateur radio license in late 2025, I've been using it almost every day. However, I've noticed that the propagation conditions in the V-band (location: Shanghai) vary greatly depending on the weather, sometimes even changing significantly within a single day. For example, at ground level with a long wire antenna, I can achieve smooth communication with the repeater at 58 MHz. But tonight, with the temperature at 2°C and polluted air, I'm standing on the 5th-floor balcony using a Diamond 770 antenna, and I can barely reach the repeater. Can anyone share their experiences and insights?

YangZifan-BA7KVH

I think there might be some, but it's very small.
When it rains a bit harder, the signal strength decreases slightly, but the impact isn't significant.

BI1NIZ

YangZifan-BA7KVH No, it's not that bad. I'm nowhere near the level of "Rain Decay" at 47G.🤣

BG5FUM

This effect may not be in the transmission itself, but rather on the repeater unit. Currently, most repeaters rely on analog components, and a key component is the water-bucket capacitor, which is very susceptible to temperature changes, leading to frequency drift.
This is just a personal opinion and may not be accurate. I welcome any criticism or discussion.

BI4BEC_sanshou

BG5FUM It seems like this might be the reason.

BG7MEB

Would a multi-pole antenna perform better than the 770 antenna under those specific conditions? Could we compare them using the same antenna? Are there any obstructions on either the ground or rooftop transmission paths? Given this distance, should the weather have minimal impact?😄

BH4GRM

Introduction to Anomalous Propagation in Atmospheric Waveguides

BG5JFW

I feel that the U-band propagation seems to be better during thunderstorms.

BG8KUQ

Sometimes, on cloudy days, the V-band may be able to communicate over a greater distance.

BG2GFC

I also have some personal opinions.
Based on my personal measurements, I was able to receive a good repeater signal from a repeater located approximately 100 km away at around 22:00 in the summer, using the whip antenna mounted on my vehicle at an elevation of 6 floors.
However, once winter arrives, even using a directional antenna like CJU cannot receive any return signals.😅

ping

This does happen; I've experienced situations where, even in rainy conditions, I was able to connect with a repeater that I normally couldn't reach, but the connection only lasted for a few seconds.

Moonlight

There's also a situation where, if the weather is very bad, your repeater administrator will shut down the repeater.
The reason why no one can get through at this time is not due to the spread of information...

BG7MGW

For long-distance communication with a repeater, the signal quality is better in light rain and foggy conditions, likely because the rain attenuates all signals, including interference. This results in improved voice communication quality. However, this does not work in heavy rain.

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