Is there abnormal propagation on the U-band? My handheld radio, SRJ77 with an antenna, successfully opened a repeater in Zhenjiang, located 150 km away.

y010204025

QTH：苏州虎丘区马涧
手台：森海克斯8800
功率：大约4W
高度：70m
天线：钻石SRJ77ca

在楼顶测试国赫U7V4八木天线，成功打开了镇江中继，测试距离150公里。
告诉群内的友台，友台用车载苗子打开了镇江中继，然后我更换为钻石SRJ77,也可以正常打开镇江中继。
当前测试打开中继的距离：崇川中继、江阴中继、靖江中继 80公里。

BA4TAY

y010204025 Ugh, I'm also having trouble connecting to the local repeaters on 145.1 and 145.775 in Shanghai using my 8800 and Diamond SRJ77. Even though I can receive signals, I can't transmit through the repeater. My location is Cao Road, Pudong, at the top of the 18th floor. On weekends, I tried calling out for a long time, but nothing happened.

BH4SKY

QTH: Pingjiang New City, Suzhou, Jiangsu Province
Handheld radio: BaoFeng 5R Mini
Power: High power, 5 watts
Height: 90 meters
Antenna: 5 yuan each, made in China, brand "Pinyixi"
It was also opened, and I was able to communicate with BD4RFG.

BG5BNW

😀

BH4GRM

BA4TAY There are Lujiazui skyscrapers between Cao Road and Shanghai Repeater; a parking space is required.&5-element Yagi antenna

BH4SKY

BA4TAY You can try connecting to the V-band frequency of the Kunshan repeater.

y010204025

BA4TAY There might be some obstruction in the middle; I can access the Shanghai V-band repeater from this location (Tiger Hill).

BA4TAY

BH4GRM A 5-element V-band Yagi antenna seems a bit large.

BH4GRM

BA4TAY The results are significant, even if it's a bit stronger.

BA4TAY

BH4SKY I am located in the easternmost part of Shanghai, and I cannot connect to any of the V-band repeaters in Shanghai.😅

BH4SKY

BA4TAY Sometimes, abnormal propagation doesn't necessarily occur. After all, the distance from Suzhou to Zhenjiang last night was only 160 kilometers.

y010204025

BH4SKY This morning I tried to access the repeater located on the 14th floor in Zhenjiang.

BH4SKY

y010204025 I couldn't open it in Tiger Hill.

y010204025

BH4SKY Try a higher location; with my SRJ77 antenna, I can connect to a V-band repeater at 40 km away. With a Yagi antenna, I can reach the Shanghai V-band repeater at 80 km.

BH9FPK

The key factor in Jiangsu province is the relatively flat terrain. If the repeater is slightly elevated, it can cover a very long distance. Adding some height to the handheld radio will further improve coverage.

BH4SKY

y010204025 I find it strange that the V-band reception is good, but I can't seem to transmit. Specifically, when using the Kunshan repeater, I can open connections to Wuxi, Yixing, Changzhou, and even Zhenjiang and Nanjing, but I can't establish a connection back to Kunshan on the V-band.

y010204025

BH4SKY There shouldn't be a distance issue. Consider the location and antenna gain. What is your QTH located at? A friend in Shanghai tried to connect with me using a 25W+ Yagi antenna, but failed. He even couldn't reach the Shanghai V-band repeater. The transmission characteristics of U-band are different; U-band has better omnidirectional propagation capabilities, while V-band can propagate further in an unobstructed environment.

BH4SKY

y010204025 If there's no UV segment, then it should just be a case of obstruction.

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