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Antennas

Placement

3D printed support

zip ties / heat shrink

A possible option is to use zip ties and heat shrink to protect your radio receiver antennas, as follows:

Here is what it looks like:

You can also do like MrSteele:

Here is what it looks like:

Repair antenna

It happens frequently that your antennas are cut by the propellers (e.g. after a crash). To repair an antenna, all you need to do is to remove the shield protecting the antenna to leave the antenna wire exposed with a specific length, given by the following formula:

speed of light (in m/s) / freq (in Hz) / 4 

where

• speed of light: 299,792,458 m/s
• freq: 2.4 GHz = 2,400,000,000 Hz

Applied to 2.4Ghz radio signal, it gives us:

299,792,458 / 2,400,000,000 / 4 = 0.03122838104 m = 31.23 mm

The antennas on the Frsky X4RSB receiver have the following layers:

Here is how it should look like:

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