rad1o

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= Antennas

The board has a PCB antenna for the 2.5 GHz ISM Band, for stand alone operation on the Camp Area. For other frequencies an external antenna may be needed.

== How to attach an external antenna

=== Temporary
To improve radio reception a little bit you can just press a thumb against the upper right corner and be a human antenna. 
The most simple real external antenna is a single-wire copper cable (others may also work). This can be pressed against an edge of the little black resistor on the top right corner.
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=== Soldering
<note important>**When soldering an antenna or SMA connector, a resistor (R315, 0 Ohm) must be turned 90 degrees or replaced with a bridge, connecting the RF line on the left to the SMA connector pads on the right**</note> (then the 0 Ohm resistor will be sitting on the R314 pads; R314 and R315 share the upper left pad).

The SMA connector should be an edge-launch SMA connector for a PCB thickness of 1.6mm

Resistor turned 90 degrees
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Alternative: Add bridge, remove resistor
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Using a soldered copper cable as antenna:
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Adding an SMA connector so that you can connect an external antenna for your specific needs.
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rad1o

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