MAYDAY (CALLSIGN) (GRID) 还别说，刚好能用一条ft8发送

MAYDAY (CALLSIGN) (GRID) (CALLSIGN) MAYDAY RRR

说不定还真可以 MAYDAY (CALLSIGN) (GRID) (CALLSIGN) MAYDAY R110 然后qsy up发个详情啥的😄

说不定还真可以 MAYDAY (CALLSIGN) (GRID) (CALLSIGN) MAYDAY R110 然后qsy up发个详情啥的

那这么说，似乎ft8作为应急通讯其实很靠谱，基本上时刻都有人...

FT8最不适合应急通信的部分是较为严格的时序要求，差个三四秒解码能力就会大幅度下降，没有网络的情况下需要不断手动调整时间匹配

@"BH7HQT"#p22101 这个缺陷可以通过GPS北斗弥补

@"BA7MTH"#p22102 如果是地域性的灾害还好，如果涉及到定位系统自身时钟偏差等等问题还真不好说……

@"BH7HQT"#p22101 可以根据收到信号的时间差推算自己时间

@"Bi4KKF"#p22110 你意思说看大家平均跟自己误差的时间值，然后自己偏移上去是吗？好像ft8cn可以这么操作，jtdx好像就没办法，得用第三方校时软件

If an emergency situation arises, can I use FT8 with custom information to send a distress signal?

BA7MTH

As the title suggests.

BG5VLI

Perhaps it could actually work.
MAYDAY (CALLSIGN) (GRID)
(CALLSIGN) MAYDAY, callsign R110
Then QSY UP will post more details.

BA7MTH

So, it seems that FT8 as an emergency communication method is actually quite reliable, with someone actively using it almost constantly…

BI1MHK

BA7MTH There are many radio stations, but not necessarily a large number of human staff ( ).

BH7HQT

The most challenging aspect of FT8 for emergency communication is its strict timing requirements. Even a delay of a few seconds can significantly reduce decoding performance. Without a network, users must constantly manually adjust the time synchronization.

BA7MTH

BH7HQT This defect can be compensated for using GPS and Beidou.

Bi4KKF

BH7HQT You can calculate your own time based on the difference in arrival times of the received signals.

BH7HQT

BA7MTH If it's a localized disaster, that's manageable. However, if it involves issues like clock discrepancies within the positioning system itself, it becomes much more complicated.

BA7MTH

Bi4KKF You mean that you want to look at the average time difference between everyone and themselves, and then adjust your own clock accordingly? It seems like FT8CN can be used this way, but JTDX doesn't seem to have a built-in function for it, and you would need to use a third-party clock synchronization software.

Bi4KKF

BA7MTH The JDTX can also be set to adjust the time difference, control the sending and receiving frequency, and configure the automatic program (around option 7), regardless of the software version.

BG2EWI

BA7MTH JTDX also works; simply click the "Sync" button to synchronize based on the average received signal value. However, if the time difference is more than 7.5 seconds, synchronization may fail.

BG5BQB

If everyone makes a mistake, then there are no mistakes!

BA7MTH

BI1MHK There are many robots, but overall, the probability of success is still higher than SSB. This is because SSB has fewer defenders, and it's also possible that SSB doesn't necessarily support the attack.

Jason

Last time, I encountered someone sending a custom message, but it was too short and unclear.

BI1MHK

BA7MTH It's definitely better than SSB ( ), but it seems like using CW in a wet market might also be feasible ( ).

dovesky

Why not transmit CW on FT8 or a local frequency, which would also attract attention from other radio stations and eliminate the need to worry about timing issues?

BA7MTH

Most ham radio operators can recognize and decode three-segment CW signals, but not all of them can translate the subsequent content.

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