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Author Topic: Serial cable for outdoor use with a GPS antenna?  (Read 302 times)
N8FNR
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Posts: 207




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« on: November 30, 2017, 05:57:43 AM »

I would like to use this software http://dxatlas.com/ToyNtp/ to send GPS time to my PC. DXAtlas suggests using the Garmin GPS 18x LVC https://buy.garmin.com/en-US/US/p/27594 and manually wiring it to a serial connector. However the wires are only 5 meters long and I need a run of about 30 feet to get it outside where I need to mount it. I understand that if I use heavier gauge wire that I can extend the serial wire up to 50 feet. Can anyone suggest shielded wire that I can use for this that will be OK outdoors and in the sun?

Thanks
Zack N8FNR
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N6YFM
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Posts: 516




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« Reply #1 on: November 30, 2017, 03:00:49 PM »

I would like to use this software http://dxatlas.com/ToyNtp/ to send GPS time to my PC. DXAtlas suggests using the Garmin GPS 18x LVC https://buy.garmin.com/en-US/US/p/27594 and manually wiring it to a serial connector. However the wires are only 5 meters long and I need a run of about 30 feet to get it outside where I need to mount it. I understand that if I use heavier gauge wire that I can extend the serial wire up to 50 feet. Can anyone suggest shielded wire that I can use for this that will be OK outdoors and in the sun?

Thanks
Zack N8FNR


Why?
Let me be more specific;   If you are permanently inside at a base station shack, your PC time can be VERY accurately
set using Meinberg NTP running on your PC, assuming you are connected to the internet.   If not connected to the internet,
and outside at Field Day, a mountain top, or even inside within 10 feet of a window, you can use a GlobalSat USB GPS
dongle ($25 US on ebay) and free software that works with it, to keep your clock synced with GPS time.
That entire setup is less cost than trying to extend a serial port GPS unit and weatherproofing it.
The GlobalSat unit is so sensitive with a SirfStar IV chipset, that I was locked on 8 satellites just sitting at my office
desk inside the shack, about 6 feet from the window to the outside.

So, again, please indicate the problem statement first;   what are you trying to do, where, for what usage (digital modes, etc?)
and then we can offer specific inexpensive help.

Cheers
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K7RBW
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Posts: 488




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« Reply #2 on: December 01, 2017, 06:08:02 AM »

It wasn't always this way, but these days, almost every GPS I've bought in the last 5-10 years will receive a solid signal inside. In fact, some even work in underground parking garages.

I'd give it a try inside to see if you need the longer wire, first.
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