I am BH2RSJ, a lactic acid bacteria. My QTH (location) is in Shenyang, Liaoning Province, China. Currently, due to the mountainous terrain and limited flat areas in Liaoning Province, the coverage range of repeater stations is limited. The goal for high-mountain repeater stations is to cover 100km-150km, and also to enable UV links, allowing for secondary link forwarding and relaying. Furthermore, for ease of control, it should support remote frequency control + device on/off control. In emergency situations, it can provide communication relay capabilities with disaster areas.
6.4, on my return trip from Dandong to Shenyang, I passed through Benxi and used maps and other high-altitude data to identify a potential target: the summit of a mountain approximately 600 meters in altitude. The software also indicated that there was a route leading up to it. We decided to start by driving up and exploring. To our surprise, we were able to reach an altitude of 300 meters by car. However, the subsequent route had deteriorated due to years of neglect and was blocked by rocks and vegetation. We decided to get out of the car and hike up.
The route on the mountain is very good, with clear signs of human-made trails. The summit has a lot of loose rocks, and if you drive an off-road vehicle, you can reach an altitude of 500m for easier transport. However, the final section requires hiking. We discussed the routes for transporting supplies and what preparations to make next.
On June 7th, we organized a team (ham) to conduct route reconnaissance and road clearing. The team consisted of BH2RSJ, BH2XJD, BH2SIV, BH2VPQ, BH2RGY, and had prepared tools, food, water, etc. In the morning, everyone gathered and arrived at the destination. Personnel cleared the road ahead, removing debris, weeds, and stones, while the horses followed behind at a slower pace. At noon, we reached the previous 500m mark and began searching for a route to the summit. We divided into two teams and communicated via walkie-talkies. We identified two routes up the mountain: one involved manually clearing a path and climbing step by step, while the other was a more circuitous route that made it easier to ascend.
After reaching the summit, we confirmed the location for setting up the repeater and conducted an electromagnetic environment test at the site. (Note: During the exam period, I also heard a local exam listening broadcast.)
Later, we would descend from the mountain. There was a spring at the bottom, and after resting, we would gradually descend home, completing our tasks for the day.
6.8, after discussing with several teachers, we finalized the repeater station plan: using three GM338 radios (two UHF and one VHF), a custom-made seven-zone antenna system, a UURadio duplexer, a Yeelink four-channel WiFi controller, a ZLAN 5400 serial network box, a 4G network card router, an MTTP solar power controller (supporting 4G network return transmission), a Kenwood 4m whip antenna, a Hua Hong 4m whip antenna, various feed lines, two 300W solar panels, one 200Ah gel lead-acid battery. A waterproof box for the battery. The repeater station is installed inside the waterproof box, and the solar panel has a custom-made support frame (adjustable angle). The antennas are supported by two 6m steel pipes.
After debugging, the duplexer can achieve -90 dB isolation. The overall standby current of the repeater is 0.7 A, while the UU repeater's working transmit current is 4 A and the UU-V link's working transmit current is 8 A (with U set to 15 W and V set to 20 W).
On June 14th, we again gathered several members of the Ping'an Rescue Team (including Mingge, rgy, Xiao Wu Ge, He Jie, and vpq), and through everyone working together, gradually transported the following materials to the top of the mountain: eight bags of sand, four 25kg buckets of water, 100kg of lead-acid batteries, solar panels, antenna supports, and solar panel supports. (Due to the rocky nature of the rope path, the ropes would significantly fluctuate during transport, requiring manual lifting of sections of rope near each platform to avoid collisions between equipment and rocks.)
Once the transport was complete, it was now four o'clock. Everyone sped up and began assembling the repeater base, pouring cement and stones onto the foundation. They also assembled the monitoring support structure and antenna supports, and cut away the camouflage antenna and small tree branches with solar panels.
Finally, at 8:30 PM, everything was successfully assembled. The repeater powered on and functioned normally. A successful communication test was completed.
At 9 PM, everyone finished their work, cleaned up the workplace, and returned home together.
The High Mountain repeater project, from initial planning to implementation, took a total of ten days. The repeater is now successfully in operation and all functions are normal. Currently, it covers Panjin on the southernmost end and Tie Ling on the northernmost end. With a coverage radius of 150km, it meets the requirements.
Repeater frequency: 438.800 ± 71.9
Welcome everyone to test communication!
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