General Dynamics Network Hardware LT 3600 User Manual

CG-1309  
REV C  
FEB 2006  
OPERATION & MAINTENANCE MANUAL  
UP/DN CONVERTER  
L-BAND  
LT-3600 SERIES  
EXPORT CONTROL WARNING - Do not disclose this  
document or its contents to non-U.S. Persons, or  
transmit this document or its contents outside the  
United States without the written permission of Vertex  
Communications Corporation and required U.S.  
1915 Harrison Road  
Longview, Texas 75604  
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Integrated L-Band Up/Dn Converter LT3600  
CG-1309  
TABLE OF CONTENTS  
Section 1  
General Information ................................................................................................ 6  
1.0  
1.1  
1.2  
1.3  
1.4  
1.5  
1.6  
1.7  
1.8  
Introduction.............................................................................................................................. 6  
Safety Information ................................................................................................................... 6  
General Introduction................................................................................................................ 6  
Purpose of Equipment.............................................................................................................. 6  
Specifications........................................................................................................................... 7  
Front Panel............................................................................................................................... 7  
Rear Panel................................................................................................................................ 7  
Cooling..................................................................................................................................... 7  
Part Number Selection.............................................................................................................. 8  
Section 2  
Installation .............................................................................................................. 12  
2.0  
2.1  
2.2  
2.3  
2.4  
Introduction............................................................................................................................. 12  
Unpacking and Inspection....................................................................................................... 12  
Installation Requirements ....................................................................................................... 12  
Mechanical Installation........................................................................................................... 12  
Electrical Connections ............................................................................................................ 12  
2.4.1 Power Input................................................................................................................. 12  
2.4.2 L-Band Output (J10)................................................................................................... 12  
2.4.3 IF Input (J9) ................................................................................................................ 12  
2.4.4 IF Output (J3).............................................................................................................. 12  
2.4.5 L-Band Input (J4)........................................................................................................ 12  
2.4.6 External 10 MHz Input (J2)........................................................................................ 13  
2.4.7 SSPB Interface (J6)..................................................................................................... 13  
2.4.8 Remote Serial I/O Interface (J7)................................................................................. 13  
2.4.9 High Stability 10 MHz Reference (J1) (Optional Connector).................................... 13  
Operational Check .................................................................................................................. 13  
2.5.1 Setup ........................................................................................................................... 13  
2.5  
Section 3  
Operation ................................................................................................................ 14  
3.0  
Introduction and General Operation ....................................................................................... 14  
3.1  
StarSwitch Operation.................................................................................................. 17  
3.1.1 Auto Mode ...................................................................................................... 17  
3.1.2 Standby Mode................................................................................................. 17  
3.1.3 On Mode ......................................................................................................... 17  
3.1.4 Backup Converter Operation ...........................................................................18  
3.1.5 Starswitch Alarm .............................................................................................18  
3.1.6 Dual Starswitch Operation...............................................................................18  
Front Panel Alarm Settings..........................................................................................19  
3.2  
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Integrated L-Band Up/Dn Converter LT3600  
CG-1309  
Section 4  
Serial Command Set .............................................................................................. 20  
4.0  
4.1  
4.2  
General.................................................................................................................................... 20  
LT-3600 Serial Interface..........................................................................................................20  
Communication Protocol .........................................................................................................20  
4.2.1 General Data Format …………………………………………………………………20  
4.3 Commands ................................................................................................................................... 21  
4.3.1 Set Up/Converter Frequency....................................................................................... 21  
4.3.2 Set Down/Converter Frequency.................................................................................. 21  
4.3.3 Set Up/Converter Gain................................................................................................ 21  
4.3.4 Set Down/Converter Gain........................................................................................... 21  
4.3.5 Set Internal 10 MHz Reference Oscillator Offset....................................................... 21  
4.3.6 Enable SSPB............................................................................................................... 21  
4.3.7 Down/Converter (LNB) Spectrum Control ................................................................ 22  
4.3.8 Up/Converter Spectrum Control..................................................................................22  
4.3.9 SSPB Band Control .................................................................................................... 22  
4.3.10 Set SSPB Gain (Attenuation).................................................................................... 22  
4.3.11 Enable Up/Converter .................................................................................................. 22  
4.3.12 Enable Down/Converter.............................................................................................. 22  
4.3.13 Satellite Memory Store ............................................................................................... 22  
4.3.14 Satellite Memory Recall ............................................................................................. 22  
4.3.15 StarSwitch Mode Select.............................................................................................. 22  
4.4 Status Requests .......................................................................................................................... 23  
4.4.1 Command Status......................................................................................................... 23  
4.4.2 Fractional Frequency Status........................................................................................ 23  
4.4.3 Level Status................................................................................................................. 23  
4.4.4 L-Band Status.............................................................................................................. 24  
4.4.5 Set Cable Slope Factor................................................................................................ 24  
4.4.6 Query Cable Slope Factor........................................................................................... 24  
4.4.7 Serial Number Read.................................................................................................... 24  
4.4.8 Query Software Version ............................................................................................. 24  
4.4.9 Query Card Type......................................................................................................... 25  
4.4.10 Satellite Memory Status Query................................................................................... 25  
4.4.11 Satellite Fractional Frequency Status.......................................................................... 25  
4.4.12 Star Switch Status ....................................................................................................... 25  
Page 4  
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Integrated L-Band Up/Dn Converter LT3600  
CG-1309  
APPENDICES  
Technical Manual Revision History ....................................................................................... 26  
CCA Software Revision History............................................................................................. 26  
Display Panel Software Revision History............................................................................... 26  
A
B
C
LIST OF ILLUSTRATIONS  
Figure 1-1  
Figure 1-2  
Figure 3-1  
Figure 3-2  
Figure 3-3  
Figure 3-4  
Figure 3-5  
Figure 3-6  
Figure 3-7  
Figuer 3-8  
Front Panel with Keypad and LCD Display ................................................................ 7  
Rear Panel.................................................................................................................... 7  
Front Panel Controls and Indicators ........................................................................... 14  
Menu Listing............................................................................................................... 15  
Satellite Memory......................................................................................................... 16  
StarSwitch Display – Auto Selection...........................................................................17  
StarSwitch Display – STBY Selection ........................................................................17  
StarSwitch Display – ON Selection.............................................................................17  
StarSwitch Display – Backup Converter .....................................................................18  
StarSwitch Display – Fault Indication.........................................................................18  
LIST OF TABLES  
Table 1-1  
Integrated L-Band Specifications ..................................................................................9  
Page 5  
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Integrated L-Band Up/Dn Converter LT3600  
CG-1309  
SECTION 1  
General Information  
1.0 INTRODUCTION  
This manual contains installation, operation,  
and maintenance information for the Integrated  
L-Band Up/Dn Converter manufactured by  
VertexRSI, Longview, Tx. Information is  
organized according to section. Within each  
section the pages, figures and tables are  
numbered by section and by order of appear-  
ance within the section. Unless otherwise  
noted, any information about the unit applies  
to the LT-3600, Base Part Number 201667.  
1.2 GENERAL INTRODUCTION  
This manual provides operation and service  
instructions for the Integrated L-Band Up/Dn  
Converter. The unit consists of a power supply,  
forced-air cooling system, microprocessor-  
based CCA (circuit card assembly) and control  
circuitry and the modules required for up and  
down conversion. It incorporates extensive  
monitor and control functions that are  
accessible from the front panel as well as  
through a remote serial bus. A general  
1.1 SAFETY INFORMATION  
This equipment has been designed to minimize  
exposure of personnel to hazards.  
description of the front and rear panels is given  
in Sections 1.5 and 1.6. A description of the  
Keypad and Display can be found in Section 3.  
WARNING  
The Integrated L-Band Up/Dn Converter is  
housed in an enclosure destined for mounting  
in a standard EIA 19-inch rack, requiring a  
1.75-inch high vertical space.  
A continuous safety earth ground must be  
provided from the main power source  
through the main power cord. This is  
provided in the power cable shipped with  
the unit. If this power cord is damaged, it  
should be replaced with cord of equal or  
better specifications. This cord can be  
obtained from VertexRSI.  
1.3 PURPOSE OF EQUIPMENT  
The Integrated L-Band Up/Dn Converter is a  
fully synthesized up and down converter  
covering 575 or 1000 MHz bandwidth  
receiving RF frequencies in up to 125 kHz  
steps. The unit incorporates extensive monitor  
and control functions that are accessible from  
the front panel as well as through a remote RS-  
232/422/485 bus.  
Servicing instructions are for use by trained  
personnel only. To avoid dangerous electric  
shock, do not perform any servicing unless  
qualified to do so. Do not replace components  
with the power cord connected to the  
equipment.  
The LT-3600 can be configured to  
accommodate various requirements involving  
an IF of 70 or 140 MHz, non-inverted or  
inverted spectrum, with standard or high-  
stability 10 MHz reference oscillator or any  
combination the user desires. Combined with  
jumper selectable and user programmable  
options, the LT-3600 is flexible to user  
requirements.  
WARNING  
Some of the adjustments described in this  
manual are performed with power applied  
while protective covers are removed.  
Always be careful not to come on contact  
with dangerous voltages while performing  
these procedures, and never work alone.  
With power applied to the unit and the  
cover removed, be aware that a rotating fan  
is operating.  
Page 6  
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Integrated L-Band Up/Dn Converter LT3600  
CG-1309  
1.4 SPECIFICATIONS  
(J4), On/Off Switch for Dc output on J4  
The specifications for the Integrated L-Band  
Up/Dn Converter are listed in Table 1-1, along  
with the mechanical dimensions.  
(SW2), Cooling Fans, Down Converter  
StarSwitch Interface (Opt.) (J5), SSPB monitor  
and control (J6), Remote Serial Interface (J7),  
Up Converter StarSwitch Interface (Opt.) (J8),  
IF In (J9), On/Off Switch for Dc output on J10  
(SW3), L-Band Out (J10).  
1.5 FRONT PANEL  
All the operating controls and indicators for the  
Integrated L-Band Up/Dn Converter are  
located on the front panel. The front panel is  
depicted in Figure 1-1. Alarm and level  
monitoring of the L-Band Up/Dn Converter  
CCA, an external LNB, and SSPB modules is  
accomplished through the front panel display  
and keboard interface.  
In the lower right hand side of the rear panel is  
a label that refers to the operation and  
maintenance manual and revision level that  
applies to this converter.  
1.7 COOLING  
Cooling of the equipment is achieved by  
pulling in cool air through the two side inlet  
grills. The heated air exits the equipment  
through the two rear panel mounted exhaust  
fans.  
1.6 REAR PANEL  
The rear panel is depicted in Figure 1-2. It  
incorporates, from left to right, Grounding Lug  
(GND), Power Connector, Optional 10MHz  
high stability reference output (J1), 10 MHz  
reference input (J2), IF Out (J3), L-Band In  
Figure 1-1 Front Panel w/Keypad and LCD Display  
Figure 1-2 Rear Panel  
Page 7  
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Integrated L-Band Up/Dn Converter LT3600  
CG-1309  
1.8 Part Number Configuration  
The Part Number Selection Chart shows configuration options that are set at the factory prior to  
shipment. The voltage output to J4 and J10 may be changed as required by the customer, however  
this requires removal of the cover and resetting internal jumper connections. This should be  
performed by qualified personnel.  
Base  
Number  
1st Digit  
IF Operation  
2nd Digit  
L-Band  
3rd Digit  
Bias Voltage  
4th Digit  
Ref. Oscillator  
201667  
-
1
2
70 MHZ  
1
Std.  
0
1
2
None  
0
Std 10Mhz  
140 MHz 2  
Extend  
D/C-22VDC 1 Hi Accuracy  
U/C-22VDC  
D/C-22VDC  
U/C-15VDC  
10 MHz  
5th Digit  
L-Band Ports  
6th Digit  
10 MHZ Ref. Out  
7th Digit  
StarSwitch Ready  
0
1
SMA Female  
N-Type Female  
0
1
2
3
No Output  
U/C & D/C  
U/C Only  
D/C Only  
0
1
No  
Yes  
Note: If connected to a StarSwitch, No Bias Voltage Output is allowed.  
Option Descriptions:  
1st Digit – IF Frequency, Options 3 and 4 are set for inverted spectrum.  
2nd Digit – Standard – 950 to 1525 MHz, Extended – 950 to 1950 MHz  
3rd Digit – Bias voltage outputs are switchable in rear panel, if selected.  
4th Digit – A reference oscilator is built in to the main board. The high accuracy unit is optional.  
5th Digit – D/C Input and U/C Output Port Type (J4 & J10)  
6th Digit – The output from the 10 MHz reference oscilator may be connected to either or both.  
7th Digit – StarSwitch Ready includes output connections to J5 and J8 for control between the  
Starswitch and the LT3600.  
Page 8  
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Integrated L-Band Up/Dn Converter LT3600  
CG-1309  
Table 1-1 Integrated L-Band Specifications  
UPCONVERTER  
Input Frequency Range  
Input Impedance  
50 to 90 MHz  
50 Ohms  
Input Level Range  
Output Frequency Range  
-20 to -40 dBm  
950 to 1525 MHz  
950 to 1950 MHz (Optional)  
50 Ohms  
Output Impedance  
18dB  
Output Return Loss  
Conversion Gain  
10 to 30 dB (0.5 dB steps)  
Gain Linearity (over 10 dB)  
Gain Linearity (over 20 dB)  
Gain Stability (0 to +50 °C)  
Amplitude Response (over any 36 MHz)  
Amplitude Response (over 875 MHz)  
Output Power (1 dB GCP)  
3rd Order Intermodulation (for 2 car. each at 0 dBm o/p)  
Spurious (at 0 dBm output)  
Non-Carrier  
+0.5 dB  
+1.0 dB  
+0.75 dB  
+0.75 dB  
+1.0 dB  
+10 dBm (minimum)  
-40 dBc  
-55 dBc  
-60 dBm  
Transmit Spectrum Sense  
Noise Power Density  
Non-Inverting or Inverting  
-125 dBm/Hz  
DOWNCONVERTER  
Input Frequency Range  
Input Impedance  
950 to 1950 MHz  
50 Ohms  
Input Level Range  
Output Frequency Range  
Output Impedance  
-75 to -35 dBm  
50 to 90 MHz  
50 Ohms  
18dB  
Input Return Loss  
Conversion Gain  
25 to 45 dB (0.5dB steps)  
+0.5 dB  
+1 dB  
+1 dB  
+0.75 dB  
+1 dB  
+10 dBm  
-55 dBm  
Gain Linearity (over 10 dB)  
Gain Linearity (over 20 dB)  
Gain Stability (0 to +50 °C)  
Frequency Response (over 36 MHz)  
Frequency Response (over 575 MHz)  
Output Power (1 dB GCP)  
Non-Carrier  
Spurious Over 52 to 88 MHz (at 0 dBm output)  
-50 dBc  
Receive Spectrum Sense  
Noise Figure  
Inverting or Non-Inverting  
15 dB max  
Page 9  
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Integrated L-Band Up/Dn Converter LT3600  
CG-1309  
Table 1-1 Integrated L-Band Specifications  
OPTIONAL INTERNAL REFERENCE  
Reference Frequency  
Stability (0 to +50 °C)  
Aging per Day  
10.000 MHz  
+ 2 x 10-8  
+ 1 x 10-9  
Output Level (rear panel)  
Phase Noise @ 10 Hz  
100 Hz  
+ 12 dBm +2 dB  
-115 dBc/Hz  
-135 dBc/Hz  
-145 dBc/Hz  
< -150 dBc/Hz  
1 kHz  
10 kHz  
UPCONVERTER and DOWNCONVERTER  
Synthesizer Configuration  
Dual U/C and D/C with  
Independent Programmability  
125 kHz  
Tx Synthesizer and Rx Synthesizer Step Size  
Parameter Memory Storage  
L-Band Output Phase Noise:  
at 100 Hz Offset  
at 1 kHz Offset  
at 10 kHz Offset  
Non-Volatile EEPROM  
-66 dBc/Hz  
-76 dBc/Hz  
-86 dBc/Hz  
-96 dBc/Hz  
-106 dBc/Hz  
at 100 kHz Offset  
at 1 MHz Offset  
INTERNAL REFERENCE  
Reference Frequency  
Stability (0 to+50 °C)  
10.000 MHz  
+1 PPM  
Reference Output Calibration  
Reference Programmable Control  
Output Level (10 MHz on LB IN J4 coax)  
Output Level (10 MHz on LB OUT J10 coax)  
Output 2nd Harmonic  
+10 Hz  
+20 Hz  
-2 dBm +2 dB  
-2 dBm +2 dB  
-40 dBc  
EXTERNAL REFERENCE INPUT  
Input Frequency  
Input Level  
10.000 MHz  
0 to +13 dBm  
As Required  
Frequency Stability  
CHASSIS PHYSICAL SIZE  
Height  
Depth  
Width  
Weight  
1.75 inches  
18 inches  
19 inches  
12 lbs. max.  
Page 10  
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Integrated L-Band Up/Dn Converter LT3600  
CG-1309  
Table 1-1 Integrated L-Band Specifications  
INTERFACE AND CONNECTORS  
Voltage (auto-ranging)  
Internal Electronics (Power)  
115/230 VAC +15%  
25 watts  
DB-15 (Female)  
DB-9 (Male)  
StarSwitch Interface Connectors (Options)  
Remote Serial Interface:  
Standard: RS-422/RS-485 (J7)  
External SSPB Monitor and Control (J6)  
DC Output to LNB on J4 (coaxial) (Options)  
DC Output to SSPB on J10 (coaxial) (Options)  
Operational Temperature Range  
DB-9 (Female)  
22 VDC @ 0.5 amps (max)  
22 or 15VDC @ 2.0 amps (max)  
0 to 50 °C  
Page 11  
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Integrated L-Band Up/Dn Converter LT3600  
CG-1309  
SECTION 2  
Installation  
2.0 INTRODUCTION  
2.4.1 Power Input  
This section defines the installation require-  
ments by which the Integrated L-Band Up/Dn  
Converter will meet the published  
specifications.  
This connector is an IEC 320-C14 male and  
will accept any compatible mating connector.  
The power cord supplied as standard with the  
unit is equipped with a NEMA 5-15P male  
plug at the opposite end and is compatible with  
most 115 VAC supplies. The unit is manufact-  
ured with a Universal Input Power supply that  
will accept voltages in the range of 115 or 230  
+/-15% VAC.  
2.1 UNPACKING AND INSPECTION  
Remove the unit from its shipping container  
and inspect for any damage sustained during  
shipment. Save the packing material for  
reshipment back to the factory or to another  
site. Report any damage to the shipping  
forwarder in accordance with required  
procedures.  
CAUTION  
DAMAGE MAY RESULT IF THE INCORRECT  
VOLTAGE IS APPLIED TO THE UNIT.  
2.2 INSTALLATION REQUIREMENTS  
The LT-3600 is designed for mounting in a  
standard EIA 19-inch rack. The unit must be  
supported on the sides and space must be  
allowed at the side of the unit to permit the  
flow of cooling air. The unit should be installed  
in an environment that is within the environ-  
mental envelope described in Table 1-1.  
Primary power must be made available that is  
within the specified limits.  
2.4.2 L-Band Output (J10)  
This connector is selectable as an SMA or N-  
Type female. The mate (not supplied) should  
be compatible with the 50-ohm coax used to  
connect to the system.  
CAUTION  
DC OUTPUT CURRENT MAY BE PRESENT  
ON J4 AND J10 DEPENDING ON POWER  
OPTIONS SUPPLIED FOR THE SSPB AND  
LNB.  
2.3 MECHANICAL INSTALLATION  
2.4.3 IF Input (J9)  
The chassis is equipped with threaded inserts  
on either side for the installation of slides.  
Slides are not provided with the unit. The front  
panel is equipped with slots to accommodate  
user-supplied retaining screws.  
This connector is a BNC female. The male  
mate (not supplied) should be compatible with  
the 50-ohm coax used to connect to the system.  
2.4.4 IF Output (J3)  
This connector is a BNC female. The male  
mate (not supplied) should be compatible with  
the 50-ohm coax used to connect to the system.  
CAUTION  
MOUNTING THE UNIT BY ONLY THE  
FRONT PANEL WILL CAUSE EXTENSIVE  
DAMAGE.  
2.4.5 L-Band Input (J4)  
This connector is selectable as an SMA or N-  
Type female. The male mate (not supplied)  
should be compatible with the 50-ohm coax  
used to connect to the system.  
2.4 ELECTRICAL CONNECTIONS  
All electrical connections are made to the rear  
panel of the unit. The following describes the  
rear panel connectors and its interface  
requirements. The chassis ground is a #10-32  
lug on the back panel.  
Page 12  
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Integrated L-Band Up/Dn Converter LT3600  
CG-1309  
2.4.6 External 10 MHz Input (J2)  
Port J7 may be reconfigured for RS-232 interface  
by changing the following jumpers locations on the  
main board inside the converter:  
This connector is a BNC female. The male  
mate (not supplied) should be compatible with  
the 50-ohm coax used to connect to the system.  
Serial Port  
JP3  
RS-422/485  
Jumpers On  
1-2 5-6 7-8  
9-10 11-12  
17-18  
3-4 5-6 7-8  
9-10 11-12  
19-20  
RS-232  
Jumpers On  
13-14  
TXD SER 0  
RXD SER 1  
(Standard)  
JP3  
TXD SER 1  
RXD SER 0  
JP2  
2.4.7 SSPB Interface (J6)  
15-16  
This connector is a 9-pin female miniature type  
“D” connector with standard #4-40 female  
screw-lock hardware mounting. The mating  
shell, pins, and strain relief are not supplied.  
Outputs are open collector and inputs have  
internal 1K full PS to +5V. The pin-out is as  
follows:  
13-15  
14-16  
Remove  
Install  
The pinout for RS-232 is as follows:  
Pin 1  
Pin 2  
Pin 3  
Pin 4  
Pin 5  
Pin 6  
Pin 7  
Pin 8  
Pin 9  
Not Used  
Rx +  
Tx +  
Not Used  
Ground  
Alarm Relay: Common  
Alarm Relay: Normally Closed  
Not Used  
Alarm Relay: Normally Open  
Pin 1  
SSPB Band Control Output -  
(Low = Lo Band)  
Pin 2  
Pin 3  
Amplifier Fault - Open (Hi) = ALM  
Thermal Alarm Input –  
Open (Hi) = ALM  
Pin 4  
Pin 5  
Pin 6  
Lock Alarm Input - Open (Hi) = ALM  
Up/Dn Converter Ground  
SSPB Attenuator/Enable Control –  
(Lo = Enable)  
2.4.9 High Stability 10 MHz Reference  
Output (J1) (Optional Connector)  
This connector is a BNC female. BNC jumper  
cable is supplied with this option for  
connection to J2.  
Pin 7  
Pin 8  
Pin 9  
Not Used  
SSPB Detector Input + Analog 0-5V  
SSPB Detector Input – Analog 0-5V  
2.4.8 Remote Serial I/O Interface (J7)  
2.5 OPERATIONAL CHECK  
This connector is a 9-pin male miniature type  
“D” connector with standard #4-40 female  
screw-lock hardware mounting. The mating  
shell, pins, and strain relief are not supplied.  
The electrical interface to this connector is for  
a standard RS-422/485 bus. This port may be  
reconfigured for RS-232 as shown below. For  
bus protocol requirements, refer to Section 3-3.  
The convention used for the signals is a logic  
Hi for Mark (Rest) and a logic Lo for Space.  
The pin-out is as follows for RS-422/485:  
To verify that the basic functions of the unit are  
operational, it is recommended that the  
following check-out procedure be followed  
prior to final system integration. If there are  
any questions regarding performing the  
indicated operations, refer to Section 3-3.  
2.5.1 Setup  
Connect the unit to a primary power source and  
turn on the power switch at the front of the  
unit. Verify that the power led is illuminated. If  
the power led is not illuminated, check the  
power cord and fuse. A spare 3.15 A fuse is  
provided inside the power connector.  
Pin 1  
Pin 2  
Pin 3  
Pin 4  
Pin 5  
Pin 6  
Pin 7  
Pin 8  
Pin 9  
Rx -  
Rx +  
Tx +  
Tx -  
Ground  
Switch the primary power off and connect the  
IF out, LB in, IF in and the LB out at the rear  
of the chassis to J3, J4, J9 and J10 respectively.  
Re-establish the primary source of power. The  
Front display will light and status will be  
displayed.  
Alarm Relay: Common  
Alarm Relay: Normally Closed  
Not Used  
Alarm Relay: Normally Open  
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Integrated L-Band Up/Dn Converter LT3600  
CG-1309  
SECTION 3  
Operation  
3.0 INTRODUCTION  
The Up/Down Converter can be controlled  
from the front panel or remotely via a serial  
bus located on the rear panel of the converter.  
Various menus are available for EDIT and  
DISPLAY purposes.  
See Figure 3-2 for a listing of the menus.  
Section 4 gives a complete description of the  
bus commands and conventions for operating  
the converter remotely.  
Red LED illuminates when any of the monitor  
functions in the converter are not within pre-defined  
parameters.  
PLUGGED; NOT USED  
MONITOR  
LCL ENT  
2
7
3
8
4
9
5
0
1
MENU  
UC 1200.000 +25.0 dB  
DC 1300.000 +35.0 dB  
UP/DOWN CONVERTER  
IF  
RF  
MENU  
LT3600  
6
ALARM  
MENU  
UC 1200.000  
DC 1300.000  
+25.0 dB  
+35.0 dB  
MENU  
USED TO MAKE FUNCTIONAL  
SELECTIONS WHEN IN ANY OF  
THE SET MENUS. THESE KEYS  
MOVE A CURSER UNDERLINE  
LEFT OR RIGHT TO ENTER  
NUMERICAL DATA FROM THE  
0-9 KEYS.  
USED TO SCROLL THE  
MENU DISPLAY UP  
AND DOWN.  
THE DISPLAY WINDOW SHOWS THE  
VARIOUS SETTINGS FOR THE UNIT.  
CONTROL AND STATUS MENUS  
CAN BE VIEWED BY USING THE UP  
AND DOWN MENUS KEYS.  
PRESSING THIS BUTTON  
CHANGES THE PARAMETERS  
ENTERED WHEN IN ANY OF THE  
EDIT MENUS. IF THE  
ENT  
PARAMETERS ARE CHANGED  
WITH THE NUMERICAL KEYPAD,  
BUT IF THIS BUTTON IS NOT  
PRESSED, THE PARAMETER  
UNDERLINED WILL NOT CHANGE.  
9
0
USED FOR ENTERING NUMERICAL  
DATA FOR VARIOUS PARAMETER  
SETTINGS. THE APPLICABLE  
PRESSING THIS BUTTON  
TOGGLES BETWEEN EDIT  
DISPLAY MODE.  
NUMBER IS ENTERED AT THE  
CURSER UNDERLINE AND THEN  
IS PRESSED TO ACCEPT THE CHANGE.  
ENT  
LCL  
Figure 3-1 Front Panel Controls and Indicators  
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Integrated L-Band Up/Dn Converter LT3600  
CG-1309  
DISPLAY  
EDIT  
REFERENCE STATUS  
AND CONTROL/  
SLOPE FACTOR SET  
RefOsc: OK  
Slope Factor:  
Ofst:127  
0 dB  
RefOsc: OK  
Slope Factor:  
Ofst: 127  
0 dB  
LCL  
LCL  
Unit Address: xx  
xx = 422 Mode  
Unit Address: xx  
xx = 422 Mode  
RS 485 ADDRESS  
AND STATUS  
Brd SN 1234  
S/W:v7.70  
20/12/04  
Temp: 32 C  
BOARD STATUS  
Front Panel SW v5.20  
FP Alarm Tone: On  
Front Panel SW v5.20  
FP Alarm Tone: Muted  
SOFTWARE VERSION  
AND ALARM CONTROL  
LCL  
LCL  
MENU  
STARSW: OK  
MODE:  
ON  
Auto  
STARSW: OK  
MODE:  
OFF  
STBY  
STARswitch MODE,  
AND ALARM CONTROL  
DEFAULT MENU  
UC 1200.000  
DC 1300.000  
+25.0 dB  
+35.0 dB  
UC 1000.250  
DC 1500.625  
+15.0 dB  
+30.0 dB  
LCL  
LCL  
FREQUENCY AND  
GAIN SETTINGS  
UP/DN CONVERTER  
STATUS AND MUTE  
CONTROL  
UC: Ovr State: On  
DC: Low State: Muted  
UC: Ovr State: On  
DC: OK State: On  
MENU  
UC Lvl: +1 dBm  
DC Lvl: -25 dBm  
DETECTOR LEVELS  
SSPB STATUS AND  
ALARM MASK  
CONTROL  
SSPB: Muted Lck: Bad  
Amp: OK Therm: N/A  
SSPB: Muted Lck: Bad  
Amp: OK Therm: Act  
LCL  
LCL  
LNB: OK  
Lvl: 380 mA  
LNB: Act  
Lvl: 000 mA  
LNB AND  
CONVERTER STATUS  
UC: Normal DC: Normal  
UC: Invert DC: Normal  
MENU BUTTONS TOGGLE  
ALARMS FROM ACTIVE TO  
MUTED STATES WHEN IN  
EDIT MODE  
MENU  
MENU  
SSPB: Muted Lck: Bad  
Amp: OK Therm: Act  
Figure 3-2 Menu Listing  
Page 15  
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Integrated L-Band Up/Dn Converter LT3600  
CG-1309  
MENU  
MENU  
ENTER KEY RECALLS  
MEMORY TO ACTIVE  
UC 0950.000  
DC 1525.000  
+10.0 dB  
+30.0 dB  
Make Satellite:  
Active? (Yes/No)  
0
No  
ENT  
HIT ANY KEY (0-9)  
Example (KEY 0)  
MENU  
EDIT  
0
MENU  
MENU  
ENT  
LCL  
MENU  
UC0 1200.000  
DC0 1200.000  
+20.0 dB  
+30.0 dB  
UC0 1200.000  
DC0 1200.000  
+20.0 dB  
+30.0 dB  
SELECT MENU  
ARROWS UP  
OR DOWN TO  
SCROLL 125  
KHZ STEP SIZE  
WHEN  
MENU  
ESCAPES TO  
ADJACENT MENU  
WITHOUT RECALL  
1
CURSOR IS  
ACTIVE AT .000  
ENT  
MENU  
CONFIRM AND STORE  
CHANGE TO EACH  
FIELD AND LEAVE  
EDIT MODE AFTER  
LAST FIELD  
UC1 1000.125  
DC1 1500.125  
+30.0 dB  
+45.0 dB  
SELECT MENU  
ARROW UP FOR  
POSITIVE GAIN AND  
MENU ARROW DOWN  
FOR NEGATIVE GAIN  
WHEN CURSOR IS  
ACTIVE AT GAIN SIGN  
UC9 1500.875  
DC9 1300.875  
+25.0 dB  
+35.0 dB  
Figure 3-3 Satellite Memory  
Page 16  
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Integrated L-Band Up/Dn Converter LT3600  
CG-1309  
3.1 StarSwitch Operation  
The LT3600 UP/DOWN Converter may be used in conjunction with the StarSwitch to provide  
redundancy switch over operations if configured as StarSwitch Ready. The following modes of  
operation may be selected.  
3.1.1 Auto Mode  
Upon reaching the StarSwitch Menu the information shown in Figure 3-4 will be displayed. The  
Information Window can have three selections, AUTO, STBY, or ON. The converter’s default is  
AUTO. Any of the three selections stated previously can be made, and will be activated when the  
ENTER key is pressed.  
If a particular converter is in the AUTO mode, and an alarm is activated, it will be backed up by the  
backup converter if there are no other alarms in the system. REMEMBER: ONE AND ONLY ONE  
ALARM IN THE SYSTEM CAUSES A SWITCHOVER.  
STARSW: OK  
MODE:  
ON  
AUTO  
Figure 3-4 StarSwitch Display – Auto Selection  
3.1.2 StandBy Mode  
When STBY has been selected, the display will change to the display shown in Figure 3-5a. In this  
mode the converter with this selection will be backed up if there are no other alarms in the system.  
Upon switchover to the backup converter, the display will change to Figure 3-5b indicating STBY in  
the Activity Window. Under normal operation the Summary Alarm would only be ON if there were  
another alarm activated on the converter, however in this case, the Summary Alarm is forced to be ON  
regardless of the state of the other alarms. The operator can still view the state of alarms via the other  
menus, i.e. if an alarm has been activated it will be displayed, however the Summary Alarm will  
always be ON.  
STARSW: OK  
MODE:  
ON  
STBY  
STARSW: OK  
MODE:  
STBY  
STBY  
Figure 3-5 StarSwitch Display – STBY Selection  
3.1.3 ON Mode  
When ON Mode has been selected, the display will change to the display shown in Figure 3-6. This  
mode is the opposite to the STBY mode, in that the Summary Alarm is turned OFF, so even if there  
was a valid alarm, the converter would not show a Summary Alarm. As in the STBY mode the  
operator can still view the state of the alarms via the other menus, i.e. if an alarm has been activated it  
will be displayed, however the Summary Alarm will be OFF.  
NOTE: If the converter is already in STBY mode, a change to the ON mode will not occur, unless  
there is no alarm in the system.  
STARSW: OK  
MODE:  
ON  
ON  
Figure 3-6 StarSwitch Display – ON Selection  
Page 17  
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Integrated L-Band Up/Dn Converter LT3600  
CG-1309  
3.1.4 Backup Converter Operation  
The Backup Converter must be programmed to store all of the Converter Frequencies and Gains in the  
system, in its Satellite Memory Locations, corresponding to the Converter Number (1 to 8) labeled on  
the StarSwitch Interface cables. Figure 3-7 shows the Backup Converter in Auto Mode ready to  
Backup any converter in the system and after backing up Converter 2.  
STARSW: OK  
MODE:  
STBY  
Auto  
STARSW: OK  
MODE:  
ON 2  
Auto  
Figure 3-7 StarSwitch Display – Backup Converter  
3.1.5 StarSwitch Alarm  
The StarSwitch Alarm is displayed as “Fault” in the StarSwitch Menu Window on the Backup  
Converter only. A fault indicates either an internal StarSwitch Unit failure or a Power Off condition  
detected on any one of the Converters in the system. The StarSwitch Alarm however, does not  
activate the Summary Alarms, and the Backup Converter will still backup an Online Converter when it  
is powered down. Figure 3-8 shows the Backup Converter display after Converter 1 has been powered  
off and the Backup has taken over.  
STARSW: Fault ON 1  
MODE:  
Auto  
Figure 3-8 StarSwitch Display – Fault Indication  
3.1.6 Dual StarSwitch Operation  
Each LT3600 Converter has two StarSwitch Interface connectors (J8, Main and J5, Secondary) to  
control two StarSwitch Units, for systems where switching for both Up and Down Converter sections  
is required. The two interfaces are not independent as an alarm in either Up or Down Converter  
system will cause both to switch to the backup converter. This is necessary since a failed unit,  
including both Up and Down Converter sections, will need to be removed for service. Ensure that J8,  
Main Interface, is used if only one StarSwitch Unit is configured in the system.  
Page 18  
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Integrated L-Band Up/Dn Converter LT3600  
CG-1309  
3.2 Front Panel Alarm Settings  
Active  
Modes (Default)  
Mask  
Menu Page  
Comment  
Auto  
ON  
STBY  
Must select "Auto" Mode when Starswitch is not present.  
Forces summary alarm to OFF (see Starswitch operation).  
Forces summary alarm to ON (see Starswitch operation).  
1) Starswitch  
Auto  
Mutes audio tone when in alarm.  
(has no effect on Summary Alarm condition).  
Audio Tone will indicate an Alarm.  
Front Panel  
2)  
Muted  
On  
Muted  
Alarm Tone  
N/A  
Act  
OK  
Bad  
Disable Alarm if External Reference Oscillator is not present.  
Activate for External Reference Alarm (select in Edit Mode).  
External Reference is detected (Active Mode)  
Reference  
3)  
N/A  
N/A  
Oscillator  
External Reference is not detected (Active Mode).  
N/A  
Act  
OK  
Bad  
Disable Alarm if LNB (or BDC) is not present.  
Activate for LNB supply current Alarm (select in Edit Mode).  
LNB supply current is within acceptable range (Active Mode)  
4) LNB  
LNB supply current is not within acceptable range (Active Mode)  
N/A  
Act  
OK  
Bad  
Disable Alarm if SSPB (or BUC) is not present.  
Activate for SSPB, PLL Alarm (select in Edit Mode).  
SSPB, PLL is Locked (Active Mode)  
Lck  
N/A  
SSPB, PLL is not Locked (Active Mode)  
N/A  
Act  
OK  
Bad  
Disable Alarm if SSPB (or BUC) is not present.  
5) SSPB  
Activate for SSPB, Amplifier Summary Alarm (select in Edit Mode).  
SSPB, Amplifier Summary Alarm is OFF (Active Mode)  
SSPB, Amplifier Summary Alarm is ON (Active Mode)  
Amp  
N/A  
N/A  
N/A  
Act  
OK  
Bad  
Disable Alarm if SSPB (or BUC) is not present.  
Activate for SSPB, Thermal Alarm (select in Edit Mode).  
SSPB, Thermal Alarm is OFF (Active Mode)  
SSPB, Thermal Alarm is ON (Active Mode)  
Therm  
Page 19  
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Integrated L-Band Up/Dn Converter LT3600  
CG-1309  
SECTION 4  
Serial Command Set  
4.0 GENERAL  
The standard Up/Dn Converter is controlled via a rear panel serial link (RS-422/485)(Reconfigurable  
to RS-232). With the front panel control, a user can operate the L-Band Up/Dn Converter from its  
front panel as well as from the serial link. This section describes the format for the ASCII serial  
control as well as front panel operation.  
Note: Some commands and status strings have been changed as of Software Release v7.70 (main  
board) and v5.20 (front panel). Units marked with “Rev A” on the rear panel support the new  
protocol.  
4.1 LT-3600 SERIAL INTERFACE  
The serial interface format to the Up/Dn Converter for RS-422 is identical to the RS-485 format  
except that under RS-485, the format includes an address field (aa in the format below).  
4.2 COMMUNICATION PROTOCOL  
Baud Rate:  
Parity:  
Data Bits:  
Start Bits:  
Stop Bits:  
9600  
None  
Eight  
One  
One  
4.2.1 General Data Format  
{aaCND…}  
Where:  
{
= Start byte  
aa  
C
N
D
}
= 2 character address (00 to 50, remote interface only)  
= 1 character, either C (Command) or S (Status)  
= 1 number 0 to 9, A,B,C Command or Status Number  
= 1 or more Data characters (depending on command)  
= Stop byte  
Note: The address is only used in the RS-485 mode when having several addressable units  
communicating with one station.  
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Integrated L-Band Up/Dn Converter LT3600  
CG-1309  
4.3 COMMANDS  
4.3.1 Set UP/Converter Frequency  
{aaC1xxxxx} Where xxxx(x) = First 4 numeric data characters  
Range: 0950 to 1525 (MHz) for Std. Band units  
Range: 0950 to 1950 (MHz) for Extended Band units  
Where (xxxx)x = Fifth character is fractional MHz as follows  
0 = 0.0 MHz  
1 = +0.125 MHz  
2 = +0.250 MHz  
3 = +0.375 MHz  
4 = +0.500 MHz  
5 = +0.625 MHz  
6 = +0.750 MHz  
7 = +0.875 MHz  
Note: If only four charactors entered, 0 is assumed as fifth digit.  
4.3.2 Set DOWN/Converter Frequency  
{aaC2xxxxx} Where xxxx(x) = First 4 numeric data characters  
Range: 0950 to 1950 (MHz) for Std and Extended Band units  
Where (xxxx)x = Fifth character is fractional MHz as follows  
0 = 0.0 MHz  
1 = +0.125 MHz  
2 = +0.250 MHz  
3 = +0.375 MHz  
4 = +0.500 MHz  
5 = +0.625 MHz  
6 = +0.750 MHz  
7 = +0.875 MHz  
Note: If only four charactors entered, 0 is assumed as fifth digit.  
4.3.3 Set UP/Converter Gain  
{aaC3xxxx}  
Where xxxx = 4 numeric data characters  
Range: +100 to +300 (+10.0 dB to +30.0 dB)  
in 0.5 dB steps  
4.3.4 Set DOWN/Converter Gain  
{aaC4xxxx}  
Where xxxx = 4 numeric data characters  
Range: +250 to +450 (+25.0 dB to +45.0 dB)  
in 0.5 dB steps  
4.3.5 Set Internal 10 MHz Ref Oscillator Offset  
{aaC5xxx}  
Where xxx = 3 numeric data characters  
Range: 000 to 255 (0 through 10 volts)  
4.3.6 Enable SSPB  
{aaC6x}  
Where x = 0 to disable SSPB control  
and x = 1 to enable SSPB control  
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Integrated L-Band Up/Dn Converter LT3600  
CG-1309  
4.3.7 DOWN/Converter (LNB) Spectrum Control  
{aaC7x}  
Where x = 0 for Non-Inverting spectrum  
and x = 1 for Inverting spectrum  
4.3.8 UP/Converter Spectrum Control  
{aaC7TXz}  
Where z = 0 for Non-Inverting spectrum  
and z = 1 for Inverting spectrum  
4.3.9 SSPB Band Control  
{aaC8x}  
Where x = 0 for SSPB Std.Band control  
and x = 1 for SSPB Extended Band control  
4.3.10 Set SSPB Gain (Attenuation)  
{aaC9xx)  
Where xx = 2 data characters (sign and number)  
Range: –8 to –0 (-8 to 0 dB) or ++ for full on.  
4.3.11 Enable UP/Converter  
{aaCAx}  
Where x = 0 to disable or mute the transmitter  
and x = 1 to enable or un-mute the transmitter  
4.3.12 Enable DOWN Converter  
{aaCBx}  
Where x = 0 to disable or mute the DOWN/Converter  
and x = 1 to enable or un-mute the DOWN/Converter  
4.3.13 Satellite Memory Store  
{aaCSSxyyyyyyyyyy} Where x = Number from 0 to 9 (memory position)  
y = ASCII character making up to a 10 character name for the satellite  
Stores current UP and DOWN Converter Frequencies and Gains to  
storage position specified along with a Text name  
for that satellite is so desired.  
4.3.14 Satellite Memory Recall  
{aaCSRx}  
Where x = Number from 0 to 9 (memory position)  
Recalls saved satellite settings of Frequencies and  
Gains to the current set-up.  
4.3.15 StarSwitch Mode Select  
{aaCWx} Where x = A – Auto Mode  
x = S – Standby Mode  
x = O – ON Mode  
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Integrated L-Band Up/Dn Converter LT3600  
CG-1309  
4.4 STATUS REQUESTS  
4.4.1 Command Status  
{aaS1}  
Returns:  
{aaS1bbbbccccddddeeeefffUL}  
Where  
bbbb = Up/Converter Frequency (as above)  
cccc = Down/Converter Frequency (as above)  
dddd = Up/Converter Gain  
eeee = Down/Converter Gain  
fff = Ref. Osc. Offset  
U = 0 for Non-Inverting Up/Converter, 1 for Inverting  
L = 0 for Non-Inverting LNB, 1 for inverting  
4.4.2 Fractional Frequency Status  
{aaSF}  
Returns:  
{aaSFxy}  
Where:  
Where:  
x = U/C Fractional Frequency (0 to 7, in 125 kHz increments)  
y = D/C Fractional Frequency (0 to 7, in 125 kHz increments)  
4.4.3 Level Status  
{aaS2}  
Returns:  
{S2MLffppeett}  
Where:  
M = ASCII-hex Char. MSN of bitmapped status  
F indicates no alarm in group  
D7 – Low = SSPB Lock Alarm  
D6 – Low = SSPB Thermal Alarm  
D5 – Low = SSPB Amp Alarm  
D4 – Low = LNB Alarm  
Where:  
L = ASCII-hex Char. LSN of bitmapped status  
F indicates no alarm in group  
D3 – Low = Ext. 10 MHz Ref. Osc. Alarm  
D2 – Low = Down/Converter Synthesizer Alarm  
D1 – Low = Up/Converter Synthesizer Alarm  
D0 – Low = Summary Alarm  
Where:  
Where:  
Where:  
Where:  
ff =  
2 Chars., Forward SSPB Power Detection  
Range: 00 or 16 to 40 (dBm) (00 = No SSPB)  
pp = 2 Chars., L-Band Output Level Detection  
Range: 25 to +5 (-25 to +5 dBm)  
rr =  
2 Chars., IF Output Level Detection  
Range: 25 to +5 (-25 to +5 dBm)  
2 Chars., on board Temperature Monitor  
Range: 00 to 70 (0 to 70°C)  
tt =  
Page 23  
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Integrated L-Band Up/Dn Converter LT3600  
CG-1309  
4.4.4 L-Band Status  
{aaS3}  
Returns:  
{S3bbCddTReeN}  
Where: bb = 2 Chars., LNB current Detection  
Range: 00 to 99 ( 0 - 990 mA)  
C = 1 Character, SSPB Band Control  
Range: 0 = low band, 1 = high band  
dd = 2 Characters, SSPB Gain  
Range: –8 to –0 or ++ (dB) ++ = Full On  
T = 1 Character, Up/Converter enable  
Range: 0 = disable, 1 = enable  
R = 1 Character, Down/Converter enable  
Range: 0 = disable, 1 = enable  
ee = 2 Character, SSPB current detection  
Range: 00 to 30 (0 – 3.0 A)  
N = 0 for SSPB Disable, 1 SSPB Enable  
4.4.5 Set Cable Slope Factor  
{aaFx}  
Where:  
x = numeric character  
Range: 0 to 5 (dB/500 MHz)  
4.4.6 Query Cable Slope Factor  
{aaF}  
Returns:  
{F = x}  
Where:  
x = numeric character  
Range: 0 to 5 (dB/500 MHz)  
4.4.7 Serial Number Read  
{aaID}  
Returns:  
{aaIDyymmddxxxx}  
Where :  
yy = last 2 digits of year  
mm = month  
dd = day  
xxxx = 4 digit sequence number  
4.4.8 Query Software Version  
{aaV}  
Returns:  
{aaVr.ii}  
Where:  
r = Software Release number (1 – 9)  
ii = Software Issue number (00 – 99)  
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Integrated L-Band Up/Dn Converter LT3600  
CG-1309  
4.4.9 Query Card Type  
{aaZ}  
Returns:  
{aaZxx}  
Where:  
xx = L-Band Card Type (1 – 8)  
10 = 70 MHz IF, Std. Band Unit (SBU)  
20 = 140 MHz IF, SBU  
11 = 70 MHz IF, Ext Band Unit (EBU)  
21 = 140 MHz IF, EBU  
50 = 70 MHz IF, SBU with Inv. Up/Converter Spectrum  
60 = 140 MHz IF, SBU with Inv. Up/Converter Spectrum  
51 = 70 MHz IF, EBU with Inv. Up/Converter Spectrum  
61 = 140 MHz IF, EBU with Inv. Up/Converter Spectrum  
4.4.10 Satellite Memory Status Query  
{aaSSx}  
Where  
x = Number from 0 to 9 (memory position)  
Returns:  
{aaSSxbbbbccccddddeeee}{aayyyyyyyyyy}  
Where:  
x = The number of the Satellite Memory location  
bbbb = Frequency for the Up/Converter  
cccc = Frequency for the Down/Converter  
dddd = Gain for the Up/Converter  
eeee = Gain for the Down/Converter  
y = ASCII character making up to a 10 character  
name for the satellite  
4.4.11 Satellite Fractional Frequency Status  
{aaSGn}  
Where:  
{aaSGnxy}  
n = Number from 0 to 9 (memory position)  
Returns:  
Where:  
n = The number of the Satellite Memory position.  
x = U/C Fractional Frequency (0 to 7, in 125 kHz increments)  
y = D/C Fractional Frequency (0 to 7, in 125 kHz increments)  
4.4.12 StarSwitch Status  
{aaSW}  
Returns:  
{aaSWxnyz}  
Where:  
x = O – ON (Current Status)  
X = S – STBY (Current Status)  
n = – No Converter Backed Up, (Space)  
n = 1 – Converter 1 Backed Up, (1 to 8)  
y = A – Auto Mode  
y = S – STBY Mode  
y = O – ON Mode  
z = G – SW ALM Green (Normal)  
z = R – SW ALM Red (Fault)  
Page 25  
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Integrated L-Band Up/Dn Converter LT3600  
CG-1309  
Appendix A  
Manual Revision History  
C – Add Starsw menu  
B – Add Satellite Menu Info  
M. Neely  
M. Neely  
2-03-05  
10-14-05  
D. Snyder  
D. Snyder  
2-03-05  
10-5-05  
6323  
6129  
A – Gain signs  
- Original Release  
M. Neely  
M. Neely  
8-15-05  
11-5-04  
D. Snyder  
D. Snyder  
8-15-05  
11-5-04  
6020  
5442  
Rev. No/change  
Revised By  
Date  
Approved By  
Date  
ECO#  
Appendix B  
CCA Software Revision History  
7.72  
7.71  
7.70  
7.56  
7.55  
7.54  
StarSwitch Menu and Status Update  
Added RS-485 address to Fractional Frequency Status  
High/Low gains with signs, M&C changes (July 05)  
1950 MHz limit, invert ref. osc. alarm (May 05)  
Freq. and gain limits, fixed starswitch 485 address (Feb. 05)  
Original (Jan. 05)  
Appendix C  
Display Panel Software Revision History  
5.22  
5.21  
5.20  
5.03  
5.01  
StarSwitch Alarm display message is now "Fault" was "Bad".  
Reversed Relay Alarm - now energized in no alarm condition.  
Gain signs added, U/C Spectrum invert (July 05)  
Fix Display errors (Jan. 05)  
Original (Dec. 04)  
Page 26  
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