Weight And Balance; Table 3-5. Unit Weights - Garmin GNS 530W Installation Manual

3.10.2 COM Antenna
The 500W Series unit requires a standard 50Ω vertically polarized antenna. Follow the antenna
manufacturer's installation instructions for mounting the antenna.
The antenna should be mounted on a metal surface or a ground plane with a minimum area of 18 x 18
inches. Refer to Section 2.4.2 for installation location considerations.
The antenna coax cable should be made of RG-142B, RG-400 or a comparable quality 50Ω coax.
Check for insertion loss and VSWR (voltage standing wave ratio). VSWR should be checked with an in-
line type VSWR/wattmeter inserted in the coaxial transmission line between the transceiver and the
antenna. The VSWR should be inserted as close to the transceiver as possible. When rack and harness
buildup is performed in the shop, the coax termination may be provisioned by using a 6 inches inline
BNC connection. This would be an acceptable place to insert the VSWR. Any problem with the antenna
installation is most likely seen as high reflected power. A VSWR of 3:1 may result in up to a 50% loss in
transmit power.
3.10.3 NAV Antenna
The NAV antenna is a standard 50Ω horizontally polarized NAV/VOR/Localizer/Glideslope antenna (the
glideslope may be a separate antenna in some aircraft) that receives VOR frequencies between 108 and
117.95 MHz, and localizer frequencies between 108 and 112 MHz, and glideslope information between
328.6 and 335.4 MHz. Follow the antenna manufacturer's installation instructions for mounting
antennas. It is recommended that the installer use RG-142B, RG-400 or equivalent 50Ω coax for the
NAV antenna(s).
The GNS 530W has a separate VOR/LOC and Glideslope inputs requiring some installations to use a
standard external diplexer or triplexer.

3.11 Weight and Balance

Weight and balance computation is required after the installation of the GPS 500W/GNS 530W. Follow
the guidelines as established in AC 43.13-1B, Chapter 10, Section 2. Make appropriate entries in the
equipment list indicating items added, removed, or relocated along with the date accomplished. Include
your name and certificate number in the aircraft records. Table 3-5 identifies the weight of the new 500W
Series unit equipment. Refer to Figure F-1 for the center of gravity.
GPS 500W Weight (Unit only)
GPS 500W Weight (Installed with rack and back plate)
GNS 530W and 530AW Weight (Unit only)
GNS 530W and 530AW Weight (Installed with rack and back plate)
Page 3-10
Rev. D

Table 3-5. Unit Weights

5.7 lbs. (2.59 kg)
6.8 lbs. (3.08 kg)
7.0 lbs. (3.18 kg)
8.2 lbs. (3.72 kg)
500W Series Installation Manual
190-00357-02