LibrePilot Forum

Development => Hardware => Topic started by: n8huntsman on July 20, 2016, 06:03:25 pm

Title: replacement OPlink antenna?
Post by: n8huntsman on July 20, 2016, 06:03:25 pm

I broke the antenna on my my OPlink.  It is a 433mhz model from Bangood. It has an MMCX Antenna Connector.  The MMCX whip goes to a male thread, female hole, SMA connector.  Therefore the antenna needs to be female thread with the male pin.  Most of the wifi antennas and my fpv antenna that I have lying around are female thread with a female hole and wont work.

1.) Would this work? http://www.banggood.com/Antenna-433MHz-RP-SMA-2dBi-for-3DR-Radios-p-918634.html

2.) Is there something a little more durable than these cheapies?

3.) It doesnt show the pin so to be safe, can I use one of these if need be: http://www.banggood.com/FPV-Aerial-5_8G-Cloverantenna-Mushroom-Antenna-Gain-SMA-Connector-p-907942.html

4.) I'm not sure if the gain and frequency is important to the antenna.  Does the gain and frequency need to match the OPlink?  If so, I know the frequency is 433mhz, but what gain should I use?

Thanks

Title: Re: replacement OPlink antenna?
Post by: f5soh on July 20, 2016, 07:19:59 pm

If you need the SMA from antenna side with the little male center pin you need SMA, not RP-SMA connector like wifi antennas.

You can use the adapter you linked if you don't find the right UHF antenna / SMA connector

The antenna need to be tuned for the frequency use, you cannot use a wifi (2.450Mhz) antenna for Oplink (400-440Mhz).
Same for video antennas running around 5.8GHz.

Antenna gain is mostly around 3dB gain (best case) for omnidirectional radiation.

Title: Re: replacement OPlink antenna?
Post by: mak24 on October 29, 2017, 09:08:34 pm

Hello:

I also broke my Oplink, on my Revo FC.  Please see attached picture.

Would this replacement antenna work


https://www.banggood.com/1-PCS-433MHZ-5cm-Short-SMA-Antenna-SMA-To-IPEX-Adatper-Extend-Cable-For-RC-Model-p-1100994.html?rmmds=detail-top-buytogether-auto (Straight).

Thanks in advance

Title: Re: replacement OPlink antenna?
Post by: f5soh on October 29, 2017, 10:16:15 pm

You should use the larger version like the one linked in first post.
Check the connector you need, SMA or RP-SMA.

Title: Re: replacement OPlink antenna?
Post by: mak24 on October 30, 2017, 04:24:19 am

Quote from: f5soh on October 29, 2017, 10:16:15 pm

You should use the larger version like the one linked in first post.
Check the connector you need, SMA or RP-SMA.

Thanks kindly


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