这两天又翻到前两年罗布泊自驾死人的视频了。专业卫星电话失效、没有卫星通信手机，只能等外面的人发现自驾的人失踪了报警才会有救援。如果有手台，原装天线或车载天线，手机里有业余卫星星历。在罗布泊深处，等卫星过境时进行求救的可能性大吗？

增加了一点可以忽略的可能性——你的手台压得过那些拿着多单元八木、大功率发射的台友吗？当然并不是说否定业余设备，而是不要依赖单一通讯方式，多几种方式都不嫌少。虽然手台传播距离短，但是像[这个视频](https://www.bilibili.com/video/BV1ad4y1m7zF)，就是因为出行时随手带了个手台，结果成功求救脱困。

@"tudoubocai"#p62774 卫星约等于不可能，手台要是城市周边的森林无人区走丢了还有可能求援，在沙漠这地方就别想了

当你在卫星覆盖范围内时，卫星覆盖范围大概率也在无人区，所以不是设备问题，而是大概率此时的卫星没人守

通过手台和卫星发出救援信号个人感觉是没希望。只有带上短波电台和定位仪才有可能发出求救信号。

带aprs手台呢，通过卫星转发

通过手台和卫星发出求救信号个人感觉是没希望。只有带上短波电台和定位仪才有希望。

【业余无线电】玩的就是不确定性，拿自己的小命去挑战不确定性，这不扯淡吗

你猜是你的求救信息更吸引人，还是你的格子更吸引人。

对现有的业余卫星分类讨论一下： FM卫星：频率不统一，没有星历纯靠全向天线不一定能打上去，而且转发器工作繁忙 APRS卫星：频率统一，没有星历也有希望靠全向天线打上去，但是活的太少了低轨线性星：手台技术上没法打，FM硬打可能没有人能够接收 QO100：手台技术上更加没法打，位置固定无需星历但覆盖范围有限，如果在范围内且有S/X波段设备确实可以用于应急，但有那设备还不如带短波机了

这是Starlink的业务，集成了全球统一的规范（LTE），是个4G手机就支持，自带精确定位，支持语音短信和网络…… 手台，你得先能找得到卫星，能连得上，没人“干扰”你，有人在听，听的人有能力帮你或者愿意报警，后者受理，而且定位信息也要足够准。结论就是几乎不可能。

1.业余卫星一般多是卷尺天线这种低增益天线，tx功率也普遍较小（＜5w），在没有定向天线和一定的功率的情况下很难上去； 2.有上述条件也需要手算轨道，一天过境仰角较好多为上午和晚上两次，窗口期较短，不适用应急需求； 3.假设上去了，fm星目前人多，互压严重；线性星需要设备较高级，技术要求较高，多普勒操作略繁琐；数字星还需要电脑；紧急情况下不易建立稳定链路；综上，建议选择卫星电话或支持卫星通话功能的电话或者某卫星互联网设备

Explore the possibility of using amateur satellite communication to request help from a stranded person in an unpopulated area.

BG2EWI

BD4WCL I believe that most enthusiasts will abide by the laws and regulations, and only resort to temporarily illegal launches in emergency situations when seeking rescue. However, there must be individuals with ulterior motives who abuse this function for malicious interference.

Bi4KKF

In an emergency situation, the most important thing is to effectively disseminate information, rather than focusing on analyzing communication paths, phones, satellite communications within phones, handheld radios, or even shouting. All methods should be tried while ensuring physical and electrical resources are available.

BG7SSA

I've considered it, but ultimately I feel that a satellite with a tracking function would be more convenient than using a ham repeater without a tracking function.

BG6UFA

I believe it's completely infeasible.

Even though there are better and more reliable ways to call for help.

BI9BPA

[未知用户] This is an aviation frequency band, so it is prohibited to transmit on this frequency.

BG5ADN

[未知用户]
I need to be able to handle and control Xing effectively.
Be able to accurately identify stars within 7 minutes and convey information effectively.
The other person also needs to be able to understand, and remember what was said next.
While it's not possible to say there's no chance, it's better to explore options than to simply do nothing.
If we're really going to prepare, bring a balloon (or kite) and a forwarder, along with pre-arranged emergency communication frequencies and times. This might increase our chances of survival.

BI7KGD

I've got all of these, but it's still not as reliable as having a professional satellite phone. At least that would work in an open area. Renting one that covers the entire trip is better than this, especially since I'm not staying in a remote area.

bg2qax

Bring along compressed hydrogen and nitrogen gas cylinders, and a weather balloon... imitate "Black Bag No. 1," maybe someone will hear it.

BI4PMQ

Liridice We need to rescue it in order to verify the log.

Liridice

BI4PMQ We need to prepare for a large number of people coming to help.

ErichAlfredHartmann

The probability is very low, but it's still possible. There might be a vehicle convoy traveling through the restricted area within 20-30 kilometers of you. Someone is monitoring frequency 438.500, which increases the chances. If you go to the restricted area and bring a satellite phone, it should work fine.

BG6QFO

You need a full-featured APRS device, utilize the space station, APRS broadcasting, and forward text to a designated email address. Try several times; there's a chance you might be seen.

BH9FPK

BG4IJK A 10W BaoFeng + 771 antenna; someone has used it on the ISS.

BG5VXJ

No matter what method, the information gets trapped in the remote area, as long as there is a wireless signal that can be transmitted out. Alternatively, you can use a flashlight to flash SOS signals at night. If there is no cellular network, you need to rely on other methods.

BG2GFC

I am in contact with a Turkish friend.（TA2SLC）We discussed issues related to disaster relief.
He mentioned
"In the February 6th earthquake, all Turkish systems were used in a complementary manner."
When national governments and telecommunications operators encounter such issues, enthusiasts have already been using HF and QO-100 to transmit messages.
Even VHF and UHF repeaters were deployed near the epicenter, and APRS was also a very helpful factor.
Of course, it also has its own problems, such as the frequency band used, the size of the equipment, the antenna, and the cost of the equipment.
However, for him...
"The QO-100 is too boring."
Considering the complexity of low-Earth orbit (LEO) satellites like LEO, especially in the context of natural disasters.
However, GEO satellites like QO-100 represent a potentially more effective and reliable method than shortwave radio.

My advice is that relying solely on LEO (Low Earth Orbit) satellites is essentially a self-destructive strategy. If your phone has the star chart for that day, but your antenna only consists of a lever, then…
You can only consider communication on the ISS; otherwise, it would be a waste of power.
However, if you intend to use "seek medical help" as a last resort, the results may even be worse than using shortwave QRP.

If you are truly considering entering a restricted area
HF radio + satellite phone + GPS + Yagi antenna (mounted on the vehicle) + sufficient emergency supplies + power source and vehicle chassis.
In this case, multiple backups are definitely recommended.

BG7QIW

tudoubocai If you have a Yagi antenna, you can try using it. As a satellite novice, I believe that even though FM satellite interference is severe, people will still respond to distress signals. A transit time of 10 minutes is sufficient for exchanging some necessary information.