VR2GY 發表於 29-4-2019 10:13:01

CQ旅行-石硤尾山-5兆NVIS

CQ旅行-石硤尾山-5兆NVIS

VR2GY 發表於 29-4-2019 10:17:53

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VR2GY 發表於 29-4-2019 20:22:27

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VR2GY 發表於 30-4-2019 08:08:32

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VR2GY 發表於 30-4-2019 08:20:23

建基於對頻譜特性的需求，業界代表不斷的努力，
世界無線電大會終於通過把 5MHz (5351.5~5366.5KHz)，
於IARU R3(國際電訊聯盟第3區)開放為業餘無線電頻段。

VR2GY 發表於 1-5-2019 01:21:56

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VR2GY 發表於 1-5-2019 19:02:53

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VR2GY 發表於 2-5-2019 09:28:41

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VR2VBU 發表於 3-5-2019 21:05:27





5月4日(星期六) 1400 - 2100衛星通過時程預測

VR2GY 發表於 3-5-2019 22:22:54

AO-85 carries a U/V FM repeater operating at up to 800mw. Uplink was planned for 435.180, but initial reports indicate it may be closer to 435.172 due to unforeseen temperature differences. Repeater access requires the satellite to receive a 67.0 Hz PL tone for two seconds. If the satellite does not receive a signal carrying a 67.0 Hz PL tone, the repeater will turn off after one minute. When the repeater is not activated by a signal carrying the PL tone, a voice beacon is transmitted every two minutes.
Downlink is 145.980 and includes Data Under Voice (DUV) FSK telemetry simultaneous with repeater operation. A high speed data downlink at 9600 bps is available for experiment and high resolution data. In addition to the amateur operations, there are a number of scientific experiments on board the spacecraft.


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中華業餘無線電研究會 - 業餘無線電考試（筆試）班