1. Amateur satellites typically use low-gain antennas, such as tape measure antennas, and have relatively low transmit power (typically less than 5W). It is difficult to achieve effective communication without a directional antenna and sufficient power.
2. In addition to the above conditions, manual calculation of orbits requires multiple passes per day with significant variations in transit angle, resulting in a short window of opportunity and making it unsuitable for emergency situations.
3. Assuming we're talking about the FM star, it currently has a large number of people and is experiencing significant crowding; the Linear star requires more advanced equipment and has higher technical requirements, making Doppler operation somewhat cumbersome; the Digital star also requires a computer; establishing a stable link in an emergency situation is difficult.
In summary, it is recommended to choose a satellite phone or a phone that supports satellite calls, or a specific satellite internet device.
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