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Data Hacking

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Chapter 4 — Antenna Hacks<br />

The connector shown in Figure 4-6 is called a BNC connector, and you can get many types of<br />

external antennas that connect to this port. Figure 4-7 shows a Lowe external antenna attached<br />

to the Garmin GPS III.<br />

FIGURE 4-7: Lowe external antenna attached to the Garmin III<br />

This antenna has a magnetic base, and draws power from the GPS unit itself. It is a patch<br />

antenna and offers better performance than the original antenna.<br />

The antenna also has a strong magnet at the base (see Figure 4-8) that enables it to be firmly<br />

attached to a metal surface (such as the roof of a vehicle).<br />

The BNC-style connector isn’t the only style of external antenna connector available. Figure 4-9<br />

shows the connector on a Garmin 76 GPS receiver. This is called an MCX connector, and it is<br />

much smaller than the BNC connector.<br />

But they get even smaller! Figure 4-9 shows the connector on the Haicom Compact Flash<br />

GPS receiver. This is an MMCX connector (or Mini MCX or MicroMate). This connector is<br />

much smaller than the MCX connector, but smaller also means that the threads on the connectors<br />

are more delicate and prone to damage.<br />

67

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