Navtex NX-300 antenna

Navtex NX-300 antenna

Postby Silversailor » Tue Aug 12, 2014 9:49 am

Hi, I'm installing a Furuno NAVTEX NX-300 on my boat and am struggling with the 10M cable length. I really need another couple of metres to get the display unit where I want it. Does anyone know if it's permissible to extend the antenna cable? The manual has dire warnings about not cutting it, so I'm wondering if it's a critical tuned length or something?

Would be grateful for any advice from anyone out there who has done this or knows whether it can be done without impacting the performance of the unit.
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Re: Navtex NX-300 antenna

Postby Johnny Electron » Tue Aug 12, 2014 4:55 pm

Cutting the cable shorter could allow the voltage being sent to the antenna to rise resulting in possible damage. Extending is allowed (suggest RG8X) within limits. The longer the extension, the more the required voltage will drop resulting in the antenna not working. Adding the few meters you need will be fine.
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Re: Navtex NX-300 antenna

Postby Silversailor » Wed Aug 13, 2014 12:43 am

Many thanks for the quick reply. Much appreciated
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Re: Navtex NX-300 antenna

Postby Elmo » Tue Jan 24, 2017 8:59 am

Hi, I also want to extend my antenna cable for the NAVTEX NX-300 unit and have two additional questions: (1) is it necessary to use RG8X cable or can I also use any other type of 50 ohm coax cable and (2) what type of connectors do I use? Would very much appreciate your advice. Thanks.
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Re: Navtex NX-300 antenna

Postby Johnny Electron » Fri Jan 27, 2017 9:55 am

You can use other 50 ohm cable but I recommend using marine grade products.
The connecter used on the NX-300 are the TNC type.
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Re: Navtex NX-300 antenna

Postby Elmo » Fri Jan 27, 2017 12:05 pm

Great, Thanks for the quick response!
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