Garmin G600 manual Antenna Beam Illumination, Radar Beam from 12 inch Antenna

the edge. The same antenna is used for both transmitting and receiving. The returned signal is then processed and displayed on the G600 MFD.

Radar detection is a two-way process that requires 12.36 micro-seconds for the transmitted microwave pulses to travel out and back for each nautical mile of target range. It takes 123.6 micro-seconds for a transmitted pulse to make the round trip if a target is 10 NM away.

Foreword
System	Sec 1

The GWX 68 weather radar should be used to avoid severe weather, not for penetrating severe weather. The decision to fly into an area of radar targets depends on target intensity, spacing between the targets, aircraft capabilities and pilot experience. Pulse type weather radar detects only precipitation, not clouds or turbulence. The display may indicate clear areas between intense returns, but this does not necessarily mean it is safe to fly between them. Only Doppler radar can detect turbulence.

Airborne weather radar has other capabilities beyond weather detection. It also has the ability to detect and provide distance to objects on the ground, such as, cities, mountains, coastlines, rivers, lakes, and oceans.

4.10.1.2Antenna Beam Illumination

It is important to understand the concept of the antenna beam illumination. The radar beam is much like the beam of a spotlight. The farther the beam travels, the wider it gets. The radar is only capable of “seeing” what is inside the boundaries of the beam.

Figure 4-67 Radar Beam from 12 inch Antenna

The vertical dimensions of the radar beam are shown in the figure above and the same holds true for the horizontal dimensions. In other words, the beam will be as wide as it is tall. Note that it is possible not to see areas of precipitation on the radar display because of the antenna tilt setting. With the antenna tilt set to zero in this illustration, the beam overshoots the precipitation at 15 NM. The

PFD	Sec 2
Sec 3 MFD
Sec 4 Hazard Avoidance
Features	Additional	Sec 5
& Alerts	Annun.	Sec 6
Symbols	Sec 7
Glossary	Sec 8
Appendix A
Index	Appendix
	B

190-00601-02 Rev. E Garmin G600 Pilot’s Guide 4-81