Garmin GTX 330 User Manual

190-00207-02 GTX 330/330D Installation Manual
Rev. U Page 4-5
4.4.2 Altimeter Calibration and Checkout
Refer to
Section 5.2.19 for the gray code altitude checkout.
4.4.3 Altimeter Interconnect, Dual GTX 330 Installation
A dual GTX 330 installation can accept either parallel wire gray code altimeter input or RS-232 serial data
input as shown in Figure 4-2. If transponder number 2 is a Garmin GTX 327, connect the RS-232 output
from the altitude encoder to J3271 pin 19 (refer to GTX 327 Transponder Installation Manual,
P/N 190-00187-02).
Refer to
Figure D-9, Sheet 1 for dual GTX 330 gray code altimeter interconnections. Refer to
Figure D-9, Sheets 2 and 3 for dual transponder interconnections to a GNS 480 (CNX80). The GNS 480
(CNX80) can receive digital data from only one transponder at a time. Due to system configuration, dual
transponders must be identical, i.e. dual GTX 330s, in a system with one GNS 480 (CNX80).
Refer to
Figure D-10, Sheets 1 and 2 for dual transponder interconnections to a GTN 6XX/7XX.
For complete dual installations containing two encoders, it is best to connect one encoder to each
transponder.
Figure 4-2. Dual GTX 330, Single Encoder, Serial Input Connections
P3301
P3301

Garmin GTX 330 Specifications

General

Reply Frequencies	1090 MHz
Frequency Range	1090 MHz (reply)
Power Output	200 Watts peak
Dimensions	5.7 x 1.6 x 7.5 inches (145 x 41 x 191 mm)
Temperature Range	-20°C to +55°C
Operating Voltage	11-33 VDC