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| Are low powered radio signals ever used to share a timing pulse locally? |
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| LaserSteve:
There are low power, privately owned , modest frequency, (72-74 Mhz) local time distribution systems sold in the US. There also GPS correction subcarriers with precise time and really good accuracy on FM stations in Agricultual areas available for subscription. Steve |
| cdev:
What are your suggestions for flexible but inexpensive (Gigabit-Ethernet capable) hardware? Also I'd be interested in hearing your opinion on why shouldn't somebody buy a pre-packaged router box. I do think that is probably a good idea, BTW. --- Quote from: David Hess on October 31, 2018, 07:03:40 pm ---IPv6 is no less secure or private. A firewall which blocks all incoming IPv6 connections substitutes for IPv4 NAT and the IPv6 privacy mode randomizes IPv6 IPs although IPv6 NAT could also be used. If you are that worried, use a separate internal wired network for sensitive traffic; I use a separate higher speed wired Ethernet network for my file servers. Oh, and do not use any consumer or commercial WAN to LAN router; build your own running BSD or Linux. --- End quote --- |
| cdev:
Thank you for this info! --- Quote from: LaserSteve on November 02, 2018, 06:31:07 am ---There are low power, privately owned , modest frequency, (72-74 Mhz) local time distribution systems sold in the US. --- End quote --- How accurate are they? Do any brand names or models come to mind? That sounds kind of like what I was wondering about. --- Quote from: LaserSteve on November 02, 2018, 06:31:07 am ---There also GPS correction subcarriers with precise time and really good accuracy on FM stations in Agricultual areas available for subscription. --- End quote --- One could do that on a small scale at home. Robotic lawnmower, now, that seems like a fun project. Good way to learn more about a number of different technologies too. |
| Berni:
You can get GPS modules that support differential operation to a base station. And you don't need the subscription services to do it. Usually you just need to buy a 2nd one of these RTK capable GPS modules, stick it in a fixed position somewhere around your house and somehow get its UART data over to your lawnmower or whatever. It needs a good antenna and a clear view of the sky without trees and such to get a good enough signal but once you do you can get up to 2mm positioning accuracy in relation to your DIY base station. I thought about doing a robotic lawnmower before but i never got around to it as i expect it being a lot of work before it works reliably. |
| LaserSteve:
SPECTRACOM makes some amazing gear if your a prefered customer. Steve |
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