Campbell TGT1 User manual

TGT1 GOES TRANSMITTER
OPERATOR’S MANUAL
REVISION: 3/03
COPYRIGHT (c) 1995-2003 CAMPBELL SCIENTIFIC, INC.

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Warnings for TGT-1 Users
1. The datalogger operating system must be compatible for use with the
TGT-1. CR10X dataloggers must have version 1.6 or later. CR500
dataloggers need version 1.4 or later. CR23X dataloggers should have
version 1.4 or later. CR10 and 21X dataloggers require a special PROM.
CR10 PROM is item number 8131-00, 21X PROM is item number
8132-04. Check *B mode for operating system version. If you did not
purchase the TGT-1 and datalogger together, make sure you have the latest
operating system. Contact a Campbell Scientific Applications Engineer if
you have any questions.
2. The datalogger clock must be set to Coordinated Universal Time. All
references to time are based on Coordinated Universal Time.
3. The timing of the P120 instruction should not coincide with the assigned
transmission time. Leave at least a two-minute buffer.
4. If you are using the keypad (CR10KD) when the datalogger initiates a P99,
P120 or P123 instruction, the instruction will fail without reporting a
failure.
5. Due to atmospheric interference and other sources of error, it is possible
for a data transmission to be missed by the ground station. If this happens,
your missed data is still in the datalogger until overwritten by new data.
6. To prevent communication collisions when connecting storage modules
(SM192/716, SM4M, SM16M) and a TGT-1 to the CR10(X) or CR23X,
connect the storage module and then enter the command string
“*91A9A*0” to put the storage module into the SDC mode. This is done
automatically if the storage module is connected to the logger when the
logger is powered up. The same command should be executed when a new
storage module replaces the previous one.
7. Array IDs smaller than 255 are stripped off when data are sent to the
transmitter. Array IDs between 255 and 511 (highest possible) are not
stripped off.

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Warranty and Assistance
The TGT1 GOES TRANSMITTER is warranted by CAMPBELL
SCIENTIFIC, INC. to be free from defects in materials and workmanship under
normal use and service for twelve (12) months from date of shipment unless
specified otherwise. Batteries have no warranty. CAMPBELL SCIENTIFIC,
INC.'s obligation under this warranty is limited to repairing or replacing (at
CAMPBELL SCIENTIFIC, INC.'s option) defective products. The customer
shall assume all costs of removing, reinstalling, and shipping defective products
to CAMPBELL SCIENTIFIC, INC. CAMPBELL SCIENTIFIC, INC. will
return such products by surface carrier prepaid. This warranty shall not apply
to any CAMPBELL SCIENTIFIC, INC. products which have been subjected to
modification, misuse, neglect, accidents of nature, or shipping damage. This
warranty is in lieu of all other warranties, expressed or implied, including
warranties of merchantability or fitness for a particular purpose. CAMPBELL
SCIENTIFIC, INC. is not liable for special, indirect, incidental, or
consequential damages.
Products may not be returned without prior authorization. To obtain a
Returned Materials Authorization (RMA), contact CAMPBELL SCIENTIFIC,
INC., phone [phone]. After an applications engineer determines the
nature of the problem, an RMA number will be issued. Please write this
number clearly on the outside of the shipping container. CAMPBELL
SCIENTIFIC's shipping address is:
CAMPBELL SCIENTIFIC, INC.
RMA#_____
815 West 1800 North
Logan, Utah 84321-1784
CAMPBELL SCIENTIFIC, INC. does not accept collect calls.
Non-warranty products returned for repair should be accompanied by a
purchase order to cover the repair.
815 W. 1800 N.
Logan, UT 84321-1784
USA
Phone [phone]
FAX [phone]
www.campbellsci.com
Campbell Scientific Canada Corp.
11564 -149th Street
Edmonton, Alberta T5M 1W7
CANADA
Phone [phone]
FAX [phone]
Campbell Scientific Ltd.
Campbell Park
80 Hathern Road
Shepshed, Loughborough
LE12 9GX, U.K.
Phone [phone]
FAX [phone]

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i
TGT1 GOES Transmitter
Table of Contents
1. Introduction.................................................................1
2. GOES System..............................................................1
2.1 Orbit..........................................................................................................1
2.2 NESDIS and TransmitWindows ...........................................................1
2.3 Data Retrieval...........................................................................................1
3. Specifications .............................................................2
4. Required Equipment...................................................3
4.1 Computer Base Station .............................................................................3
4.2 Field Station..............................................................................................3
5. Power Supplies...........................................................5
5.1 12 and 24 AHr Sealed Rechargeable Batteries .........................................5
5.2 AC Power and Deep-Cycle Rechargeable Batteries .................................5
5.3 Datalogger’s Batteries...............................................................................5
6. Installation...................................................................5
6.1 Wiring.......................................................................................................5
6.2 Battery.......................................................................................................6
6.3 Antenna.....................................................................................................6
7. Forward and Reflected Power....................................9
8. Programming the Transmitter..................................10
8.1 Star Pound Mode ....................................................................................10
8.2 Establishing and Editing Parameters.......................................................10
8.3 Status Information and Test Transmissions ............................................12
8.4 Error Messages .......................................................................................12
9. Programming the Datalogger...................................13
9.1 CR10X and CR10...................................................................................13
9.1.1 Instruction 120 and Instruction 124 (Fire Weather)......................13
9.1.2 Datalogger Programming Theory..................................................14
9.2 Program Instruction 123 - TGT-1 Auto Setup........................................19
9.2.1 Functional Description..................................................................19

TGT1 GOES Transmitter Table of Contents
ii
9.3 21X......................................................................................................... 21
9.3.1 Instruction 99................................................................................ 21
9.3.2 Datalogger Programming Theory................................................. 22
Appendices
A. Information on Eligibility and Getting onto
the GOES System ........................................................A-1
A.1 Eligibility............................................................................................. A-1
A.2 Acquiring Permission.......................................................................... A-1
B. Data Conversion Computer Program....................B-1
C. Antenna Orientation Computer Program..............C-1
D. Detailed Forward/Reflected Power Information...D-1
D.1 Impedance Matching...........................................................................D-1
D.2 Calculating Power-Out........................................................................D-1
D.3 Impedance Match Datalogger Program...............................................D-2
D.3.1 CR10X and CR10......................................................................D-2
D.3.2 21X............................................................................................ D-4
E. Channel/Frequency Correlation ............................E-1
F. Data Dump Datalogger Program............................ F-1
F.1 Introduction...........................................................................................F-1
F.2 Toggling User Flag 1 High ...................................................................F-1
F.3 Checking the Buffer..............................................................................F-1
F.4 Test Transmission.................................................................................F-1
F.5 Toggling User Flag 2 High ...................................................................F-1
F.6 CR10X Data Dump Program................................................................F-2
F.7 21X Data Dump Program .....................................................................F-2
G. Local Magnetic Declination...................................G-1
G.1 Determining True North...................................................................... G-1
G.2 Prompts from GEOMAG ....................................................................G-2
H. Changing the CR10’s RAM or PROM Chips .........H-1
H.1 Disassembling the CR10 ..................................................................... H-1
H.2 Installing New RAM Chips in CR10s with 16K RAM........................ H-1
H.2.1 Changing Jumpers ..................................................................... H-1
H.2.2 RAM Test.................................................................................. H-1
H.3 Installing New PROM......................................................................... H-2

TGT1 GOES Transmitter Table of Contents
iii
I. Changing the 21X’s RAM or PROM Chips................I-1
I.1 Disassembly of 21X................................................................................I-1
I.2 Installing New RAM Chips ....................................................................I-2
I.3 Changing PROM Chips..........................................................................I-2
J. Telonics Model TGT1 GOES Certification by
NOAA/NESDIA...............................................................J-1
K. High Resolution 18-Bit Binary Format..................K-1
Figures
2-1 Data Retrieval Diagram............................................................................2
4-1 A Field Station Monitoring a Well’s Depth..............................................4
4-2 Inside the ENC SAT Enclosure of a Typical Field Station.......................4
6.3-1 Antenna Mounting Hardware, Exploded View......................................7
6.3-2 Antenna Mounting Hardware, Assembled View 1.................................7
6.3-3 Antenna Mounting Hardware, Assembled View 2.................................8
6.3-4 Example Antenna Orientation Diagram.................................................9
G-1 Magnetic Declination for the Contiguous United States......................G-1
G-2 Declination Angles East of True North................................................G-3
G-3 Declination Angles West of True North ..............................................G-3
H-1 Disassembling CR10............................................................................H-2
H-2 Jumper Settings for Different RAM Configurations............................H-3
I-1 Memory Sockets on CPU Card ..............................................................I-1
Tables
6.1-1 Wiring Diagram.....................................................................................6
8.2-1 *# Parameter’s Descriptions................................................................11
8.2-2 Decimal Equivalent .............................................................................12
8.3-1 *#60 Commands..................................................................................13
9.1-1 CR10X’s Instruction 120 Parameters and CR10’s
Instruction 99 Parameters ...............................................................14
9.1-2 CR10X Example Program...................................................................15
9.2-1 P123 Parameter’s Descriptions............................................................20
9.3-1 21X’s Instruction 99 Parameters..........................................................22
9.3-2 21X Example Program ........................................................................23
D.1-1 Impedance Matching Correlation......................................................D-1
D.2-1 Pout Values.........................................................................................D-2

TGT1 GOES Transmitter Table of Contents
iv
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1
TGT1 GOES Transmitter
1. Introduction
The TGT1 transmitter supports one-way communication, via satellite, from a
Campbell Scientific datalogger to a ground receiving station. Satellite
telemetry offers a convenient telecommunication alternative for field stations
where phone lines or RF systems are impractical. This transmitter features a
crystal oscillator that is digitally temperature-compensated to prevent the
frequency from drifting into adjacent channels. The TGT1 is manufactured for
CSI by Telonics Inc. and inter-faces directly to the datalogger's 9-pin I/O port.
2. GOES System
2.1 Orbit
The TGT1 transmitter sends data via Geosta-tionary Operational
Environmental Satellites (GOES). GOES satellites have orbits that coincide
with the Earth's rotation, allowing each satellite to remain above a specific
region. This allows a user to point the GOES antenna at a fixed position in the
sky.
There are two satellites, GOES East and GOES West. GOES East is located at
75° West longitude and GOES West is located 135° West longitude. Both
satellites are located over the equator. Within the United States, odd numbered
channels are assigned to GOES East. Only even numbered channels are
assigned to GOES West. Channels used outside the United States are assigned
to either spacecraft.
2.2 NESDIS and Transmit−Windows
GOES is managed by the National Environmental Satellite Data Information
Service (NESDIS). NESDIS assigns addresses, uplink channels, and self-
timed/random transmit time windows. Self-timed windows allow data
transmission only during a predetermined time frame (typically 1 minute every
3 or 4 hours). The self-timed data is erased from the transmitter's buffer after
each transmission. Random windows are for critical applications (e.g., flood
reporting) and allow transmission immediately after a threshold has been
exceeded. The transmission is then randomly repeated to ensure it is received.
A combination of self-timed and random windows can be executed by the
TGT-1.
2.3 Data Retrieval
Data retrieval via the TGT1 and the GOES system is illustrated in Figure 2-1.
The User Interface Manual, provided by NOAA/ NESDIS, describes the
process of retrieving the data from the NESDIS ground station. The data are in
the form of 3-byte ASCII (see Appendix B for a computer program that
converts the data to decimal). You can also retrieve data directly from the

TGT1 GOES Transmitter
2
NESDIS ground station via the DOMSAT satellite downlink. DOMSAT is
only practical for organizations with many GOES users; contact NESDIS for
more information (see Appendix A).
Phone
modem
NESDIS
Wallops Station, VA
ground station has
10 asynchronous
dial circuits
communication/power cable
Antenna cable
Environmental enclosure
Phone
line
Computer Base Station
Transmitter Power
supply
Datalogger
Data Collection Platform
Yagi antenna
FIGURE 2-1. Data Retrieval Diagram
3. Specifications
Output level: +40 dBm (10 watts), +1.0 dBm at 12 VDC with automatic
leveling control
Typical current drain: 9 mA quiescent, 2200 mA active
Operating temperature range: −40°to +60°C
Supply voltage range: 10.5 to 14.0 VDC
Dimensions: 3.5" x 7.2" x 4.4" (8.9 x 18.3 x 11.2 cm)
Weight: 2.1 lbs (1.0 kg)
Self-timed buffer: 2000 bytes
Random buffer: 2000 bytes
Transmission rate: 100 bits per second
Typical number of data points transmitted: 118 for a 1 minute transmit-
window (with 15 second guard bands)
Maximum EIRP allowed by NESDIS: +50 dB
Antenna's maximum gain: +9 dB with right-hand circular polarization, +12
dB with linear polarization.
Clock accuracy: Capable of running 420 days without adjustment.
NESDIS
Wallops Station, VA
ground station has
10 asynchronous
dial-up circuits
Field Station
(
DCP
)

TGT1 GOES Transmitter
3
4. Required Equipment
4.1 Computer Base Station
The equipment required at the computer base station is listed below.
•Phone modem with MNP level 4 error correction. (Most commercially
available Hayes-compatible modems contain this error-checking protocol.
Check the operator's manual for your modem).
•Computer with user-supplied commu-nication software (e.g., Procomm
Plus, Crosstalk).
4.2 Field Station
The field stations equipment is illustrated in Figures 4-1 and 4-2. The required
equipment is listed below.
•TGT1 satellite transmitter (includes the SC925G communication/power
cable). If required, the datalogger's PROM is ordered with the transmitter.
•Datalogger (CR23X, CR10X, CR500, CR10, or 21X). A CR10KD
keyboard/display is required when using a CR10X, CR10, or CR500. The
CR10 and 21X require a special PROM. When using a 21X with both a
TGT1 and a storage module (SM192, SM716, or CSM1), hardware and
datalogger programming modifications are required. Contact a Campbell
Scientific applications engineer for more information.
•RHCP Yagi antenna, mounting bracket (CSI model 12261), and COAX
NM-L cable.
•Campbell's ENC SAT enclosure. The ENC SAT includes a water-tight
compression fitting for the antenna, 6 water-tight compression fittings for
the sensors and the solar panel, a 12 AHr or 24 AHr (optional) sealed
rechargeable battery, a Campbell's CH12R regulator, and an MSX10 solar
panel.
•A 6832 filter is also required when measuring sensor(s) requiring
equalization with the atmosphere (e.g., vented pressure transducers,
barometers). This filter fits into one of the ENC SAT compression fittings
to allow pressure equalization between the inside and outside of the
enclosure. The filter retards the entry of water vapor into the enclosure
protecting the transmitter and measurement electronics.

TGT1 GOES Transmitter
4
CAMPBELL
SCIENTIFIC
INC.
CR10
MADEINUSA
WIRINGPANELNO.
EARTH
DIFF
SE AG HL AG H LAG H LAG GGE3AG
4 5 6
78 910 1112 GGGG
12V12V
SWITCHED
12V
G12V
POWER
IN
SERIALI/O
SE
DIFF AG HL AG H LAG H LAG GGE1E2
1 2 3
12 34 56 G5V5VP1P2 C8C7C6C5C4C3C2C1
CONTROL
12V
SWITCHED
INT
EXT
BATT
OFF
ON
CHG
CHG
+12
+12
thiaia
tryutoread this whoever
thiaia
thiathia
thiathia
thiathia
thiathia
thiathia
thiathia
thiathia
thiathia
thiathia
thiathia
thiathia
thiathia
thiathia
thiathia
thiathia
thiathia
DESI PAK.
DESIPAK.
DESIPAK.
SPECIFICATIONMIL-D-3463
KALDHFI;OAKJIAIAJHFHOALDLIFJ
ASLFJOAKD
ASLFJOAKD
ASLFJOAKD
ASLFJOAKD
ASLFJOAKD
ASLFJOAKD
ASLFJOAKD
ASLFJOAKD
ASLFJOAKD
SPECIFICATIONMIL-D-3463
KALDHFI;OAKJIAIAJHFHO ALDLIFJ
ASLFJOAKD
ASLFJOAKD
ASLFJOAKD
ASLFJOAKD
ASLFJOAKD
ASLFJOAKD
ASLFJOAKD
ASLFJOAKD
ASLFJOAKD
DONOTEAT
UNITEDDESICCANTS-GATES
UNITEDDESICCANTS-GATES
DONOTEAT
UNITEDDESICCANTS-GATES
UNITEDDESICCANTS-GATES
DESI PAK.
DESIPAK.
DESIPAK.
SPECIFICATIONMIL-D-3463
KALDHFI;OAKJIAIAJHFHOALDLIFJ
ASLFJOAKD
ASLFJOAKD
ASLFJOAKD
ASLFJOAKD
ASLFJOAKD
ASLFJOAKD
ASLFJOAKD
ASLFJOAKD
ASLFJOAKD
SPECIFICATIONMIL-D-3463
KALDHFI;OAKJIAIAJHFHO ALDLIFJ
ASLFJOAKD
ASLFJOAKD
ASLFJOAKD
ASLFJOAKD
ASLFJOAKD
ASLFJOAKD
ASLFJOAKD
ASLFJOAKD
ASLFJOAKD
DONOTEAT
UNITEDDESICCANTS-GATES
UNITEDDESICCANTS-GATES
DONOTEAT
UNITEDDESICCANTS-GATES
UNITEDDESICCANTS-GATES
FIGURE 4-1. A Field Station Monitoring a Well's Depth (Solar Panel Not Shown)
CAMPBELL
SCIENTIFIC
INC.
CR10
MADE IN USA
WIRING PANEL NO.
EARTH
DIFF
SE AG H L AG H L AG H L AG GGE3 AG
4 5 6
78 910 1112 GGGG
12V 12V
SWITCHED
12V
G 12V
POWER
IN
SERIAL I/O
SE
DIFF AG H L AG H L AG H L AG GGE1 E2
1 2 3
12 34 56 G 5V5V P1P2 C8C7C6C5C4C3 C2 C1
CONTROL
12V
SWITCHED
INT
EXT
BATT
OFF
ON
CHG
CHG
+12
+12
thia ia
tryu to read this whoever
thia ia
thia thia
thia thia
thia thia
thia thia
thia thia
thia thia
thia thia
thia thia
thia thia
thia thia
thia thia
thia thia
thia thia
thia thia
thia thia
thia thia
DESI PAK.
DESI PAK.
DESI PAK.
SPECIFICATION MIL-D-3463
KALDHFI;O AKJI AI AJHFHO ALDLIFJ
ASLFJOAKD
ASLFJOAKD
ASLFJOAKD
ASLFJOAKD
ASLFJOAKD
ASLFJOAKD
ASLFJOAKD
ASLFJOAKD
ASLFJOAKD
SPECIFICATIONMIL-D-3463
KALDHFI;O AKJI AI AJHFHO ALDLIFJ
ASLFJOAKD
ASLFJOAKD
ASLFJOAKD
ASLFJOAKD
ASLFJOAKD
ASLFJOAKD
ASLFJOAKD
ASLFJOAKD
ASLFJOAKD
DO NOT EAT
UNITED DESICCANTS-GATES
UNITED DESICCANTS-GATES
DO NOT EAT
UNITED DESICCANTS-GATES
UNITED DESICCANTS-GATES
DESI PAK.
DESI PAK.
DESI PAK.
SPECIFICATION MIL-D-3463
KALDHFI;O AKJI AI AJHFHO ALDLIFJ
ASLFJOAKD
ASLFJOAKD
ASLFJOAKD
ASLFJOAKD
ASLFJOAKD
ASLFJOAKD
ASLFJOAKD
ASLFJOAKD
ASLFJOAKD
SPECIFICATIONMIL-D-3463
KALDHFI;O AKJI AI AJHFHO ALDLIFJ
ASLFJOAKD
ASLFJOAKD
ASLFJOAKD
ASLFJOAKD
ASLFJOAKD
ASLFJOAKD
ASLFJOAKD
ASLFJOAKD
ASLFJOAKD
DO NOT EAT
UNITED DESICCANTS-GATES
UNITED DESICCANTS-GATES
DO NOT EAT
UNITED DESICCANTS-GATES
UNITED DESICCANTS-GATES
FIGURE 4-2. Inside the ENC SAT Enclosure of a Typical Field Station
TGT1
CR10X
Datalogger
Optional
Storage
Module
12 AHr or 24 AHr
Battery and Bracket
Ground Lug
SC925G Cable
CH12R
Antenna Cable
16/18 Enclosure
Compression Fittings
Desiccan
t

TGT1 GOES Transmitter
5
5. Power Supplies
5.1 12 and 24 AHr Sealed Rechargeable Batteries
Typically, the system is powered with a 12 AHr sealed rechargeable battery
that connects to a CH12R regulator and an MSX10 solar panel. The 12 AHr
battery lasts 15 to 20 days per charge. A 24 AHr sealed rechargeable battery
which lasts 30 to 40 days is available.
This assumes the data are trans-mitted for 30 seconds at 3 hour
intervals, the datalogger's scan rate is 1 second, and the sensors
have negligible power consumption.
A discharged 12 AHr battery is recharged by a 10 watt solar panel in 2 to 3
days when there are a 1000 watts per square meter of illumination and the solar
panel temperature is 25°C. A 20 watt solar panel is available. The battery
voltage should be monitored with datalogger program Instruction 10, sampled,
and output as a part of the user’s data stream.
5.2 AC Power and Deep-Cycle Rechargeable Batteries
Although either the 12 or 24 AHr battery is sufficient for most systems,
applications with high current drain sensors or peripherals (e.g., SDM devices)
might require AC power or a user-supplied deep-cycle rechargeable battery that
is trickle-charged with an MSX20R solar panel. Campbell Scientific's power
supply brochure and application note provide information about determining
your system's power requirements.
5.3 Datalogger's Batteries
The transmitter's power consumption is too high for alkaline batteries. The
21XL's rechargeable batteries do not source sufficient current for the
transmitter. Although the PS12LA 7 AHr battery can power the transmitter, the
battery only lasts 3 to 7 days per charge. One option is to have the datalogger's
batteries power the datalogger and sensors, while the transmitter uses a 12 AHr
battery, a 24 AHr battery, or a deep-cycle battery.
The datalogger's batteries should be removed when not in use.
Rechargeable batteries should be trickle charged by a PS12LA or
CH12R charger.
6. Installation
6.1 Wiring
Typically, ENC SAT hardware (excluding the battery and solar panel) and the
datalogger are premounted and prewired. The enclosure's ground lug must be
connected to an appropriate earth ground (see Table 6.1-1).
NOTE
NOTE

TGT1 GOES Transmitter
6
6.2 Battery
Before installing the battery, the CH12R's power switch must be turned OFF.
To install the battery, remove the battery bracket from the ENC SAT and insert
the battery facing outward into the bracket. When inserting the 24 AHr battery
into its bracket, the battery’s power connections (posts) go on the top side
where a section of the bracket has been cut away. Reattach the bracket to the
ENC SAT, and connect the battery cable (see Table 6.1-1). The antenna must
be connected to the transmitter before turning on the CH12R's power switch.
6.3 Antenna
You mount the antenna to a tripod, tower, or vertical 1.5" OD pipe (see Figures
6.3-1 through 6.3-3). The antenna is then oriented towards the satellite by
using a computer program (see Appendix C). This program prompts you for
the satellite's longitude (provided by NESDIS) and the antenna's longitude,
latitude, and height. It then calculates the antenna's elevation and azimuth (see
Figure 6.3-4). You must also account for local magnetic declination (see
Appendix G).
After the antenna is properly oriented, insert the antenna cable into the
enclosure's largest compression fitting and connect the cable to the transmitter.
The antenna must be connected before transmission or the
transmitter will be damaged.
TABLE 6.1-1 Wiring Diagram
SC925G Cable
25-Pin connector connects to TGT1 I/O port
Black connects to CH12R (Ground)
Red connects to CH12R +12 Terminal
9-Pin connector connects to datalogger I/O port
Antenna Cable
BNC male connector connects to TGT1 BNC female port
Red Cable
Connects to CH12R +12 and datalogger 12 V
Black Cable
Connects to CH12R and datalogger G (Ground)
Green Cable
Connects to datalogger G (Ground) and is routed through the enclosures ground
lug and connected to earth ground
Battery
Connects to CH12R INT white connector
Solar Panel
Connects to CH12R CHG Ports
CAUTION

TGT1 GOES Transmitter
7
FIGURE 6.3-1. Antenna Mounting Hardware, Exploded View
FIGURE 6.3-2. Antenna Mounting Hardware, Assembled View 1
Fits onto the 1.5"
OD pipe

TGT1 GOES Transmitter
8
FIGURE 6.3-3. Antenna Mounting Hardware, Assembled View 2
Fits onto the
1.5" OD pipe

TGT1 GOES Transmitter
9
(22,300 miles)
36 (Elevation Angle)
E
(90 )
S (180 )
W
(270 )
N
(360 )
213 (Azimuth Angle)
DATA
COLLECTION
PLATFORM
ANTENNA
GOES SATELLITE
EXAMPLE ORIENTATION
FIGURE 6.3-4. Example Antenna Orientation Diagram
7. Forward and Reflected Power
Forward and reflected power are measured (in decimal units) and updated
during each transmission (see Sections 8 and 9). The forward power must be
within 165 to 215 for the transmitter's output level to be within specifications.
The antenna/cable assembly is operating properly when the percentage of
power reflected is less than 5. A reflected power reading of 27 is 5% of 165
and 2.7% of 215.
This percentage can be estimated with the following equation (see the
datalogger program in Appendix D.3).
% power reflected = [((ref + 17.4)/(fwd + 17.4))2x 100] - 1

TGT1 GOES Transmitter
10
When the percentage of power reflected is greater or equal to 5, one or more of
the following situations exist and must be corrected:
•The antenna is not connected.
•The antenna is too close to metal.
•You are transmitting inside a building.
•The antenna is covered with snow or ice.
•The frequency that the antenna is tuned to does not match the transmitter's
frequency.
•There is a problem with the coaxial cable connector or connection.
•There is a problem with the antenna cable.
8. Programming the Transmitter
8.1 Star Pound Mode
The star/pound (*#) mode is for programming the transmitter. It establishes and
edits parameters, displays status information, and performs test transmissions. The
*# mode is accessed via a keyboard/display (not with a computer).
If storage modules are used along with the TGT-1, enter the
command “*91A9A*0” after connecting the storage module.
*# mode cannot be accessed without a P120 instruction in the
program table.
8.2 Establishing and Editing Parameters
The parameters set the transmitter's clock and define the address, transmission
intervals, and uplink channels (see Table 8.2-1). The parameters are
temporarily stored in the datalogger. The clock parameters are transferred to
the TGT-1 after parameter 3 is entered with the “A” key. The remaining
parameters are transferred to the TGT-1 after parameter 26 is entered with the
“A” key. If the keyboard/display sits idle for 2 minutes, the datalogger will
discard all changes that have not been transferred to the TGT-1.
Before establishing the parameters, type in *0. The display should show only
LOG, not LOG1, LOG2, or LOG12.
The *# mode will not run when *1 and *2 are active, therefore
their scan rates must be set to zero.
Enter the *# mode by typing in *#. The colon disappears during the upload
process and reappears when the process is complete. 12:00 is displayed when
you are in *# mode. Press A to edit parameters. 01: is then displayed
indicating the datalogger is ready for parameter 1. You type an A to store each
parameter and to advance to the next one. Individual parameters can also be
edited by typing in *# and the parameter number. Remember, the TGT-1 clock
is not changed until the “A” key is pressed after the 3rd parameter. No other
changes are saved until the “A” key is pressed after the 26th parameter.
NOTE
NOTE
NOTE