Adafruit All About Raspberry Pi HQ Camera Lenses User Manual
GTR 225/225A/225B
Pilot's Guide
COPYRIGHT & TRADEMARKS
© 2012-2020 Garmin Ltd. or its subsidiaries. All rights reserved.
Except as expressly provided herein, no part of this manual may be reproduced,
copied, transmitted, disseminated, downloaded or stored in any storage medium,
for any purpose without the express written permission of Garmin. Garmin hereby
grants permission to download a single copy of this manual and of any revision to
this manual onto a hard drive or other electronic storage medium to be viewed for
personal use, provided that such electronic or printed copy of this manual or revision
must contain the complete text of this copyright notice and provided further that
any unauthorized commercial distribution of this manual or any revision hereto is
strictly prohibited.
Garmin® is a registered trademarks of Garmin Ltd. or its subsidiaries. These
trademarks may not be used without the express permission of Garmin.
SOFTWARE VERSION
This manual reflects the operation of System Software version 2.10, or later. Some
differences in operation may be observed when comparing the information in this
manual to later software versions.
INFORMATION & SUPPORT
For information regarding the Aviation Limited Warranty, refer to Garmin’s website.
For aviation product support, visit flyGarmin.com
.
October 2020 Printed in the U.S.A.
Warnings, Cautions, and Notes
WARNING
CAUTION
CAUTION
NOTE
NOTE
NOTE
NOTE
FOR SAFETY REASONS, GTR 225 OPERATIONAL PROCEDURES MUST BE LEARNED ON
THE GROUND.
THE GARMIN GTR 225 DOES NOT CONTAIN ANY USER-SERVICEABLE PARTS.
REPAIRS SHOULD ONLY BE MADE BY AN AUTHORIZED GARMIN SERVICE
CENTER. UNAUTHORIZED REPAIRS OR MODIFICATIONS COULD VOID BOTH
THE WARRANTY AND THE PILOT’S AUTHORITY TO OPERATE THIS DEVICE
UNDER FAA/FCC REGULATIONS.
THE GTR 225 USES A DISPLAY COATED WITH A SPECIAL ANTI-REFLECTIVE
COATING THAT IS VERY SENSITIVE TO SKIN OILS, WAXES, AND ABRASIVE
CLEANERS. CLEANERS CONTAINING AMMONIA WILL HARM THE
ANTI-REFLECTIVE COATING. IT IS VERY IMPORTANT TO CLEAN THE DISPLAY
USING A CLEAN, LINT-FREE CLOTH AND AN EYEGLASS LENS CLEANER THAT
IS SPECIFIED AS SAFE FOR ANTI-REFLECTIVE COATINGS.
Do not use outdated database information. Databases used in the system
must be updated regularly in order to ensure that the information remains
current. Pilots using an outdated database do so entirely at their own risk.
Garmin recommends that if flying in a region with 8.33 kHz COM channel
spacing, the radio should remain in 8.33 kHz mode. This will prevent the loss
of stored user and recent frequencies.
All visual depictions contained within this document, including screen images
of the GTR 225 bezel and displays, are subject to change and may not reflect
the most current GTR 225 software. Depictions of equipment may differ
slightly from the actual equipment.
This device complies with part 15 of the FCC Rules. Operation is subject to
the following two conditions: (1) this device may not cause harmful
interference, and (2) this device must accept any interference received,
including interference that may cause undesired operation.
190-01182-00 Rev. D Garmin GTR 225/225A/225B Pilot’s Guide i
Warnings, Cautions, and Notes
NOTE
NOTE
NOTE
NOTE: This device complies with Part
15 of the FCC limits for Class B
digital devices. This equipment
generates, uses, and can radiate
radio frequency energy and, if not
installed and used in accordance
with the instructions, may cause
harmful interference to radio
communications. Furthermore, there
is no guarantee that interference will
not occur in a particular installation.
If this equipment causes harmful
interference, the user is encouraged
to try to correct the interference by
relocating the equipment or
connecting the equipment to a
different circuit other than the
affected equipment. Consult an
authorized dealer or other qualified
avionics technician for additional
assistance if these remedies do not
correct the problem.
Operation of this device is subject to
the following conditions: (1) This
device may not cause harmful
interference. (2) This device must
accept any interference received,
including interference that may
cause undesired operation.
To obtain accessories for your unit,
please contact your Garmin dealer.
The display surface is coated with
a special anti-reflective material,
which is very sensitive to skin oils,
waxes, and abrasive cleaners. It is
very important to clean the display
using an eyeglass lens cleaner
which is specified as safe for
anti-reflective coatings and a
clean, lint-free cloth.
This product, its packaging, and its components contain chemicals known to
the State of California to cause cancer, birth defects, or reproductive harm.
This notice is being provided in accordance with California’s Proposition 65.
If you have any questions or would like additional information, please refer
to our website at www.garmin.com/prop65.
Canadian installations: In accordance with Canadian Radio Specifications
Standard 102 (RSS 102), RF field strength exposure to persons from an
antenna connected to this device should be limited to 60 V/m for controlled
environment and 28 V/m for uncontrolled environment.
The COM transceiver antenna(s) of the equipment mount along the fuselage
and are accessible only to aircraft maintenance personnel.
ii Garmin GTR 225/225A/225B Pilot’s Guide 190-01182-00 Rev. D
Warnings, Cautions, and Notes
Product Registration and Support
Help us better support you by completing your online registration today! Have the
serial number of your product handy and connect to the Garmin website
(www.garmin.com
Registration link on the Home page. Also, be sure to record your serial number in the
space provided.
For aviation product support, visit flyGarmin.com.
or https://fly.garmin.com/fly-garmin). Look for the Product
Record of Revision
PART
NUMBER
190-01182-00
REVISION DATE CHANGE DESCRIPTION
A 11/19/12 Initial Release.
B 03/30/15 Added v2.10 functionality.
C 10/05/20
D 10/21/20
Added COM transceiver note and
removed support phone numbers.
Updated images on page 3-14.
190-01182-00 Rev. D Garmin GTR 225/225A/225B Pilot’s Guide iii
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iv Garmin GTR 225/225A/225B Pilot’s Guide 190-01182-00 Rev. D
Table of Contents
1 GETTING STARTED ............................................................................................................ 1-1
1.1 Product Description ................................................................................... 1-1
1.2 Pilot Controls ............................................................................................ 1-2
1.3 USB Port ................................................................................................... 1-3
2 COM RADIO BASIC OPERATION ................................................................................ 2-1
2.1 Selecting a COM Frequency ...................................................................... 2-1
2.2 Monitoring the Standby COM Channel ..................................................... 2-2
2.3 Saving a COM Channel ............................................................................. 2-2
2.4 COM Database Look-Up ........................................................................... 2-4
2.5 Emergency Channel .................................................................................. 2-5
2.6 Stuck Mic .................................................................................................. 2-5
2.7 Frequency Database Reverse Look-Up ....................................................... 2-5
2.8 Remote Frequency Selection Control ......................................................... 2-6
3 FUNCTIONS ........................................................................................................................... 3-1
3.1 Functions .................................................................................................. 3-1
3.2 COM Frequencies ..................................................................................... 3-2
3.2.1 Recent COM Frequencies ................................................................... 3-2
3.2.2 COM User Frequencies ....................................................................... 3-2
3.2.3 COM Database Frequencies ................................................................ 3-4
3.2.4 COM Nearest Airports (APT) ............................................................... 3-5
3.2.5 COM Nearest Area Control Center (ACC) Frequencies ........................ 3-5
3.2.6 COM Nearest Flight Service Station (FSS) Frequencies ......................... 3-6
3.2.7 COM Nearest Weather (WX) Frequencies ........................................... 3-6
3.3 ICS Configuration ..................................................................................... 3-7
3.3.1 Adjust Intercom .................................................................................. 3-7
3.3.2 AUX Audio ......................................................................................... 3-8
3.3.3 Intercom On/Off ................................................................................. 3-8
3.3.4 Speaker On/Off .................................................................................. 3-9
3.4 System Configuration ............................................................................. 3-10
3.4.1 COM Spacing ................................................................................... 3-10
3.4.2 COM Sidetone (Software v2.10 or later) ........................................... 3-11
3.4.3 Display Brightness ............................................................................ 3-12
3.4.4 Display Contrast ............................................................................... 3-12
3.4.5 Database Info ................................................................................... 3-13
3.4.6 Load Database ................................................................................. 3-13
3.4.7 Software Version .............................................................................. 3-14
3.4.8 Serial Number .................................................................................. 3-14
3.5 Timers ..................................................................................................... 3-15
3.5.1 Setting Up the Count Down Timer ................................................... 3-15
3.5.2 Setting Up the Count Up Timer ........................................................ 3-15
3.5.3 Viewing Timers in the COM Display .................................................. 3-16
4 DATABASE INFORMATION ............................................................................................ 4-1
4.1 Downloading the Frequency Database ...................................................... 4-1
4.2 Updating the GTR 225 Frequency Database .............................................. 4-1
5 TROUBLESHOOTING ........................................................................................................ 5-1
5.1 Messages .................................................................................................. 5-3
190-01182-00 Rev. D Garmin GTR 225/225A/225B Pilot’s Guide v
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vi Garmin GTR 225/225A/225B Pilot’s Guide 190-01182-00 Rev. D
Getting Started
Photo Sensor
Locking
Screw
USB Port
Power On/Off,
COM Volume,
Squelch
On/Off
Frequency
Monitor Key
Press To Return To
COM Display
View Recent or User Freq
Intercom Function
Function Selection
Clear Data Key
Enter Key
Outer and
Inner Knobs
(Frequency
Adjust)
1 Getting Started
1.1 Product Description
The GTR 225 COM Radio series provides a powerful VHF communications
transceiver. In addition to the traditional COM features, the GTR 225 series
incorporates workload-reducing functions.
The GTR 225 series monitors the standby COM frequencies and stores the user’s
most-used frequencies. The GTR 225 (10 watt) COM radio operates in the aviation
voice band, from 118.000 to 136.975 MHz, in 25 kHz steps (default). For European
operations, configuration for 8.33 kHz steps is provided with the GTR 225A (10 watt)
and GTR 225B (16 watt).
GTR 225 Front Panel Description
190-01182-00 Rev. D Garmin GTR 225/225A/225B Pilot’s Guide 1-1
Getting Started
Squelch, TX, or RX
Annunciator
Active Frequency
Annunciator
COM Volume Bar Graph
Standby Frequency
Annunciator
COM Mode
Annunciator
1.2 Pilot Controls
The GTR 225 controls are designed to simplify systems operation, minimize
workload, and reduce time required to access functionality. Controls are comprised
of dual knobs for frequency tuning, COM volume/squelch knob, and bezel keys.
Power/COM Volume/Squelch Knob
The Power/COM Volume/Squelch knob located in the top left corner of the bezel
controls audio volume for the COM radio. To power on, turn the knob clockwise
past detent. Turn the knob counterclockwise to power off. When the COM radio is
active, press the Power/COM Volume/Squelch knob to toggle automatic squelch
control On/Off for the COM radio.
The COM radio has an automatic squelch to reject many localized noise sources. You
may override the squelch function by pressing the Power/COM Volume/Squelch
knob. This facilitates listening to a distant station or setting the desired volume level.
To override the automatic squelch, press the Power/COM Volume/Squelch knob
momentarily. Press the Power/COM Volume/Squelch knob again to return to
automatic squelch operation. When the automatic squelch is overridden, an “SQ”
indicator appears in the upper left corner of the display, left of the active COM
frequency window.
1-2 Garmin GTR 225/225A/225B Pilot’s Guide 190-01182-00 Rev. D
COM Volume and Squelch Display
Getting Started
NOTE
Outer Knob
Inner Knob
The outer right and inner right knobs are used for tuning frequencies and data entry.
To switch between the active (left-most) and standby (right-most)
frequency press and release the FLIP/FLOP key. Switching between
COM frequencies is disabled when transmitting.
To return to the COM radio mode press the COM key.
To recall and toggle between the COM Recent and User Frequency lists
press the MEM key.
To toggle display of the ICS settings for Intercom On/Off, AUX Audio,
or the Intercom settings press the ICS key.
To erase information, cancel entries, and reset timers press the CLR
key.
To save selected values, to confirm a prompt, or to save the standby
frequency press the ENT key.
The FUNC (Function) key accesses function categories for the COM
Radio, ICS Configuration, System Configuration, and Timer. Pressing
the FUNC key once displays the Function mode. Pressing the FUNC key
a second time exits the Function mode.
The MON (Monitor) key engages the monitor function. The standby
frequency can be monitored while still listening to the active
frequency.
1.3 USB Port
The USB port is used to update the frequency database in the GTR 225.
For updating the databases, Garmin recommends the use of a USB 2.0 compatible
flash drive. The flash drive must be formatted as FAT32.
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1-4 Garmin GTR 225/225A/225B Pilot’s Guide 190-01182-00 Rev. D
COM Radio Basic Operation
Identifier and Type Shown For
The Selected Frequency
Asterisk Indicates Multiple Types
Exist For The Selected Frequency
2COM Radio Basic
Operation
2.1 Selecting a COM Frequency
New frequencies are first selected as a standby frequency and then toggled to the
active side with the FLIP/FLOP key. While viewing the standby frequency display, use
the outer and inner knobs on the right side of the GTR 225 to select the desired
frequency.
COM Frequency Selection
1. Press COM, if necessary, to reach the COM radio function. The COM
annunciator on the top line of the display will show.
2. Turn the outer knob to change the values in one MHz increments. The MHz
selection range is between 118 and 136 in one MHz steps.
3. Turn the inner knob to change the values in 25 kHz or 8.33 kHz increments.
The kHz selection range is between 000 and 975 kHz in 25 kHz steps or 000
and 990 kHz in 8.33 kHz steps.
4. Turn the outer and inner knobs clockwise to increase and counterclockwise to
decrease the frequency values. Standby frequency selection is not inhibited
during transmit.
5. When connected to a position source, the nearest station identifier will be
shown for the selected frequency. Frequencies with multiple types will have
an asterisk next to the identifier.
6. Press and release the FLIP/FLOP key to toggle the standby frequency to the
active frequency.
190-01182-00 Rev. D Garmin GTR 225/225A/225B Pilot’s Guide 2-1
COM Radio Basic Operation
NOTE
Monitor
Annunciation
Monitored
Standby
Frequency
Number of
Frequencies Saved
2.2 Monitoring the Standby COM Channel
COM Frequency Monitor Annunciation
The Frequency Monitoring function allows you to monitor the standby frequency for
activity, while listening to the active frequency.
Press the MON key in the COM function to listen to the standby frequency. A small
“MN” will replace the “STB” to the left of the standby frequency.
When the active frequency receives a signal, the unit will switch automatically to the
active frequency. The active frequency quality is not affected. The Frequency Monitor
function is turned off by pressing the MON key again.
2.3 Saving a COM Channel
The current standby frequency may be saved into the COM User Frequency database
from the COM display or the COM User Function. The COM User Frequency
database can hold up to fifteen frequencies.
When switching from 8.33 kHz to 25 kHz mode, any 8.33 kHz-specific user
frequencies will be deleted from the user frequency list. This only affects the user
frequencies within the 8.33 kHz spectrum.
COM User Frequency Name Selection
1. Press ENT.
2. Turn the inner knob to select characters.
3. Turn the outer knob to move the cursor.
4. After selecting characters, press ENT.
5. Turn the outer knob to select the waypoint type.
6. Turn the inner knob to select the type from the list.
7. Press ENT to save displayed value.
Press CLR to cancel the changes.
2-2 Garmin GTR 225/225A/225B Pilot’s Guide 190-01182-00 Rev. D
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