The effect of weather conditions on UV transmission.

BI4BEC_sanshou

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

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.

闽ICP备2021006864号-7

闽公网安备35020602002794号互联网举报中心

用户协议隐私政策社区规范积分规则中继规则转载须知
更新日志联系我们常见问题友情链接运营报告赞助

浩奇科技（厦门）有限公司

是无线电，把我们联系在一起