众所周知，ft8等数据通信模式严重依靠精确的时间作为校准，而js8call等模式通信的电台在线数量也不多。在户外、野外等场景下，网络信号并不能实时保证在线以及质量，所以，经过尝试，目前摸索出一套“离网数据通信授时方案”，适用于ft8等通信模式的离网授时服务。所需基础： BktTimeSync软件 [upl-image-preview uuid=bfadd567-52e7-489a-a1d4-feff66838406 url=https://storage.hamcq.cn/2026-06-12/1781257891-864089-image.png alt={TEXT?}] VK-172 GPS棒 [upl-image-preview uuid=fed10c17-d076-4814-8291-2c8f4e44fe27 url=https://storage.hamcq.cn/2026-06-12/1781257831-917867-image.png alt={TEXT?}] 操作方法： [upl-image-preview uuid=44a1ed7e-bf8b-4ba2-8a84-380addbb6df0 url=https://storage.hamcq.cn/2026-06-12/1781258095-913747-image.png alt={TEXT?}] 这种设置可以网络及GPS双源授时，可保证无网模式或网络受限情况下的手势温馨提醒，因GPS原理问题，使用该方案时不太建议进入敏感场所及地区。（以上涉及图片来源自网络）

看起来好像没有北斗，北斗我记得大部分都要接那个大尾巴头天线来着（x

借楼请问一下，Mac上有类似的时间同步软件吗？

用BPM的信号同步不香咩？可以用电台接收bpm授时信号然后写个电脑程序识别来进行同步x

@"BH6BMJ"#p97655 bpm 应该只能用于驯服时钟吧，毕竟它不包含绝对的时间戳信息？

感觉可以用 bpc 授时，连 GPS 都不用买😈

@"BD1CAZ"#p97639 要同步啥，直接敲sntp -sS不就行了

@"BG5BQB"#p97680 有道理，按理说mac是自带ntp的，就是之前找不到手动同步的方法，好几次ft8的时候有8，9秒的延迟😂，用命令行就没问题了

Off-grid data communication time synchronization solution

BH3XZT

As widely known, data communication modes like FT8 rely heavily on precise timing for synchronization. Furthermore, the number of online radios using modes such as JS8Call is also limited. In outdoor and remote environments, network signals cannot guarantee real-time availability and quality. Therefore, after experimentation, a "standalone time synchronization solution" has been developed that is suitable for standalone time synchronization services for FT8 and similar communication modes.
Required prerequisites:
BktTimeSync software

VK-172 GPS pole

Operating Instructions:

This configuration allows for dual time source synchronization via network and GPS, ensuring accurate timekeeping even in offline or network-constrained modes.

Please note that due to the principles of GPS, it is not recommended to use this method in sensitive locations or areas. (The images used are from the internet.)

BG4QBF

Please pay attention in the front row.

BH2VSQ

It seems like there's no BeiDou, and I remember that most of them needed to connect to that large-tailed antenna. (x)

BG5GDP

Membrane

BI4JMS

👍 Very good!

BD1CAZ

Regarding borrowing a Mac, are there any time synchronization software options available on macOS?

BG5BQB

BD1CAZ To synchronize, simply use `sntp -sS`.

BG6QED

BD1CAZ I found a macOS time synchronization tool that supports USB GPS receivers. https://github.com/vu2cpl/timesync-mac

BH6BMJ

Wouldn't using BPM signals for synchronization be better? You could use a radio to receive BPM timing signals and then write a computer program to recognize and synchronize based on them.

BI1XJT

BH6BMJ BPM should only be used for controlling a clock, right? Because it doesn't contain absolute timestamp information?

BH6BMJ

BI1XJT Yes, but generally, computer clocks can be off by at most a few hundred milliseconds. They can be calibrated.

BI1XJT

I think we could use BPC to synchronize time, and we wouldn't even need to buy a GPS device. 😈

BD1CAZ

BG5BQB That makes sense. Logically, Macs should have NTP built-in, but I couldn't find a manual synchronization method before. There was sometimes a delay of 8 to 9 seconds when using FT8.😂It works perfectly when used from the command line.

Liridice

It's very important to have a long-term supply (≥2 days), and I like the convenience of being able to eat directly from the package.

BA4QBB

Okay.👍

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