Local NTP via 4G-router? (or standalone box)

Hello! I have come across an installation where a device requires NTP in order to be able to follow a schedule for timed events.

There is a PC on the installation, but the PC is fed internet though wifi (4G specifically), and is cabled by ethernet to the AV-system.

I have tried following the [guide ](https://techlibrary.hpe.com/docs/otlink-wo/How-to-Configure-a-Local-NTP-Server.html)from Hewlett Packard, but the device (a DSP) does not seem to pick up on the Time Server. The device needs an address it can get the Time Sync from, and I've tried punching in the IP-adress of the connected PC, but I'm unsure if this is the way to go.

My questions:

* If you have a Local NTP server set up on a Windows, what would you enter on a third party device as the NTP address instead of e.g. pool.ntp.org? * Secondary, if the PC is not installed permanently, is there something like a rack mountable Time Server that any of you recommends?

Thanks!