As Singapore is considered as a city environment, U band should be better that it provides a better penetration than V band. In addition, the size of antenna for U band is also smaller than V band. However, I really cannot understand why U band is not used even for repeaters in Singapore and Malaysia.
Compare to other countries like China, U band is commonly used even amateur service is classified as secondary service from 430 to 440. Hence there must be certain reasons that U band are not commonly used. Anyone knows about the reason?
In addition, digital mode in UV band are also not common in Singapore and what is the reason?
Post by Roland Turner 9V1RT on Nov 16, 2017 20:54:18 GMT 8
SARTS owns 2 repeaters, one VHF and one UHF, however only the VHF one is on-air. There is at present no antenna installation site for the UHF repeater. The hope is that we'll find a site capable of covering the east part of the island. I'm not sure that there was any particular reason for installing the VHF repeater first.
I am interested in setting up a network of 5W UHF repeaters on people's balconies, however don't yet have enough volunteers to host them. In this application UHF is relevant simply because of the smaller antenna requirement.
As currently I am in Wuxi City, Jiangsu Province, China, I realised that they are all using U band only. Even the U band simplex will be much better than the V band we are using in Singapore. The signal penetration is good.
In addition, the repeater (U band) in Wuxi City is very effective due to its height (~400m hill top). So height with no obstruction is important.