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External Antenna for LoRa RF96  XML
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d00m



Joined: 19/10/2015 17:21:10
Messages: 32
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Hello,

I need put my Anarduino+RF96 LoRa (915MHz) to remote place and I need install external antenna for it because device will be covered in case and located under snow.
So I need advice - which radio cable I need use to bring out the antenna.
Will be ok to use usual coaxial TV cable ?
50 or 75 Ohm ?
And how to solder it to device - central wire to ANT pin and shied to GND ?
And at the end of the cable I need make ~8cm wire ? Or solder connector and buy some special antenna for my freq - 915 Mhz ?
I need working range about 200-300m.

Thank you.
d00m



Joined: 19/10/2015 17:21:10
Messages: 32
Offline

Anything?
Rick



Joined: 30/05/2014 22:08:56
Messages: 93
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Greetings,

Just a simple 1/4 wave length monopole would work fine--soldered to the ANT pin.

I generally wouldn't use a coax with attached antenna, but it would work if you attach to the ANT pin with shielding attached to adjacent GND, impedance would be 50ohm (not 75), and the attached antenna needs to be tuned to 915Mhz. A 915Mhz whip type or other would suffice as well.

We also have thousands of 2dBi antennas available in stock, but I just need to add them to the website.
Here's a link:
http://www.ebay.com/itm/915Mhz-Antenna-2dBi-/171877270861
These are simple to use, just solder onto ANT.

Let me know if you have further questions.

Best Regards,
Rick
d00m



Joined: 19/10/2015 17:21:10
Messages: 32
Offline

Hello Rick
Thank you for your answer.

Just want to clarify my situation - I want use coaxial cable because my device will be in box, and this box will be under snow layer about 2 meters.
So I need bring the antenna above this snow. And seems I need at least 2 meters of cable.

I just soldered to ANT and GND 3m of 50ohm TV cable and put on the end of this cable piece of wire ~8 cm. Seems everything works ok.
But need to test range..
Also I don't know if I need buy 2dBi antennas instead just piece of wire ~8cm length.
Rick



Joined: 30/05/2014 22:08:56
Messages: 93
Offline

Hi,

I suspect it will work fine with the 50ohm coax with proper antenna on the end.
wire or whip antenna of proper wavelength on the end should suffice.

BTW, The LoRa devices will work using distances significantly beyond 300m(by a factor of 10X), so even if your antenna configuration is somewhat less than ideal, you'll probably still be okay.
Curious, have you considered the 69HW/HCW product line? They will give you 300m at much lower cost than the LoRa.

Let me know how things work out, I'd be interested to hear more of your project.

All the best..
-Rick
 
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