Jump to content

Attention: RC-CAM.com will be closing down August 2021.

The RC-Cam.com forum was the very first online community dedicated to the advancement of wireless video cameras on radio controlled (R/C) models. This is now called "FPV" (First Person View). We are proud of the contributions that our members have made to the FPV hobby.

We've seen significant changes over the last twenty years. Initially there were a lot of eager R/C hobbyist that built their own video systems. Allowing these creative individuals to share their work was the purpose of this site. Now the FPV market is flooded with low cost systems; Sadly DiY FPV video projects are now rarely discussed.

RC-CAM.com (main site and forum) will be closing down August 2021. This was announced several months ago (March 2021) to allow our members ample time to download any information that is important to them. After the site is shutdown the information will no longer be available here.

We appreciate every member's involvement with advancing the FPV hobby. It is indeed sad to say goodbye to all our online friends. Be safe and stay healthy.



9dbi Whip or 8 dbi Patch antenna?


Recommended Posts

Hi, although i have been interested in FPV for some time now.. today i made my first actual fpv-flight. Well, actually i just recorded the flight. Everthing went well, except that the camera i got is a very poor one.

I am thinking about upgrading my stuff and first of all i will purchase a better camera and a better rx-antenna. The camera is quite simple to choose i think, but the antenna gives me some trouble. I was looking around and found a 8dbi patch antenna and a 9dbi whip antenna.

I am new to this so i would think the 9dbi whip should be better since its got a better gain and receives from all directions, whereas with the 8dbi patch i would need to stay in a more or less wide corridor for good reception.

Am i grossly oversimplifying things and the 8dbi patch would still be better or is the 9dbi whip the better choice for me?

Thx in advance, Jens

Edited by D4RK1
Link to comment
Share on other sites

The 9dBi whip will be perfectly useless. Yes it catches 360° horizontally, but that means it needs to reduce vertical sensitivity to achieve its gain. So when flying at any reasonable height above the horizon you'll be out of the coverage range.

Link to comment
Share on other sites

Don´t get fooled with the omnidirectional term at higher gains they are very critical on the vertical plane. Here it´s a simple rf antenna pattern.

You can see that you only have 8º to have the 9dBi, only 30º with 6dBi more than 40-50º you start on the attenuation instead of getting gain of it.

pattern_hg2409rd.gif

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

×
×
  • Create New...