The range of Guangdong is too large; frequencies are not meaningful here. Instead, I will provide a direct method for finding repeaters:
Go http://weixin.cqcqcq.cn/ First, check for nearby repeater stations. Then, find a good location for transmission, such as the top of a high building or a mountain peak. Use the equipment to individually test each repeater station, and if you can hear a clear echo after releasing the PTT (push-to-talk), then that is a potential repeater station to contact.
The specific operating method is to set the transceiver to a frequency offset direction, frequency offset size, and sub-audio setting. Disable the "eliminate tail sound" function. Press and hold the PTT key, then release it immediately. Be careful not to repeatedly cut off a channel, as this will affect others.