Table of Contents
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Table of Contents
Summary of Contents for SmartTrunk Systems ST-9116
- Page 1 ST-9116 Programming Software Manual Rev V1.0 – MAR 2014...
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Page 2: Table Of Contents
Contents Programming Software: ........................6 1.1. Installation..........................6 SDR programming software aspect and screen areas............... 14 2.1.1. File name screen area: ....................15 2.1.2. Menu Bar screen area: ....................15 2.1.3. Quick Access Bar: ......................16 2.1.4. Frequency Chart ......................16 2.1.5. - Page 3 4.2.2.10. Menu ..........................30 4.2.2.11. Reset ..........................30 4.2.2.12. Slot Change ........................30 4.2.2.13. Link Status ........................31 4.3. Enhanced optional programing ..................... 31 4.3.1. Repeater parameters ......................32 4.3.1.1. Repeater name: ......................33 4.3.1.2. Repeater ID: ........................33 4.3.1.3. FAN Mode: ........................
- Page 4 4.6.1.2. Edit Analog Profile Name: ..................... 52 4.6.1.3. Selecting the type of audio filters ................. 53 4.6.1.4. CTCSS table enabled ...................... 53 4.6.1.5. Enable the Voice Log Service on Analog Profiles ............54 4.6.1.6. Enable the Roaming Service on Analog Profiles ............54 4.6.1.7.
- Page 5 5.5.1.7. Squelch Sensitivity ....................69 5.5.1.8. Channel bandwidth ....................69 5.5.1.9. Channel mode selection ................... 70 5.5.1.10. Channel Profile Selection: ..................70 Reading the Repeater programming from the device ............71 Writing a radio file ........................ 73 Repeater Alignment ......................74 Repeater factory Reset ......................
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Page 6: Programming Software
1. Programming Software: ST-9116 repeater has been equipped with USB 3.0 compatible port and Ethernet 802.3 network port. Programming software has been designed to let you control any of the repeater features, looking for simplification of the programming process. 1.1. Installation As you are a SmarTrunk distributor, the last updated programming software is available on your shared server area (Drop Box). - Page 7 Figure 1: SDR programming software welcome screen Click on [Next] to start the installation process. You will be prompted to introduce the destination folder. By default it is: C:\Program Files (x86)\Smartrunk\SDRe_Programmer However, you can change it as per your convenience. SDRe Programming Software Revision V1.0 P a g e...
- Page 8 Figure 2: SDR programming software file location setup Please be sure that you have, at least, minimum free space in your destination disk as per the recommended on this screen Note: 2 Disk space requirement Click on [Next] to continue or [Back] to return to previous step. SDRe Programming Software Revision V1.0 P a g e...
- Page 9 Figure 3: Start Menu destination Please type the desired Menu folder where you will find the shortcut to run the software once installed into your computer. Default name is: SDRe Programmer Software Click on [Next] to continue or [Back] to return to the previous step. SDRe Programming Software Revision V1.0 P a g e...
- Page 10 Figure 4: Additional task to be performed by installation software If you do not want to create a shortcut into desktop, then uncheck the mark. Click on [Next] to continue or [Back] to return to the previous step. SDRe Programming Software Revision V1.0 P a g e | 10...
- Page 11 Figure 5: Installation parameters review Check the option listed to ensure it is in agree to your desired setting, then press [Install] to proceed with the installation or press [Back] to return to the previous step As soon as you press install, the progress bar shows you the installation process evolution.
- Page 12 Figure 6: SDRe Programmer Software Installation progress bar As soon as the installation finishes, you will be asked to run the software or to finish the process. SDRe Programming Software Revision V1.0 P a g e | 12...
- Page 13 Figure 7: SDR Installation Software Final Screen Leave the mark to run the software immediately or uncheck if you want to run the software later. If you leave the mark, then the SDR programming software starts immediately. SDRe Programming Software Revision V1.0 P a g e | 13...
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Page 14: Sdr Programming Software Aspect And Screen Areas
2. SDR programming software aspect and screen areas For your convenience, the SDRe programming software has been organized grouping the access to the different group of parameters or actions into a very clear shape. File name Menu Bar Quick Access Bar Frequency Chart Scroll... -
Page 15: File Name Screen Area
2.1.1. File name screen area: This area shows the name and root to the current file in use. In case you have not saved any file yet, this bar will shows only Programmer and alignment Software. 2.1.2. Menu Bar screen area: This screen area lets you get the access to the right menu of each one of the features and services. -
Page 16: Quick Access Bar
2.1.3. Quick Access Bar: This tool bar includes the icons to be used a shortcut saving time for most frequently actions: Create a new file form scratch Open an existing file Save current file Print current file information Read the repeater Write to the repeater 2.1.4. -
Page 17: Software Version
ESN shows the Electronic Serial Number of the attached device. It is unique number who identifies the repeater. Last Prog Shows the date and the time of the last time the attached repeater has been programmed. RTC Shows the current date and time of the Real Time Clock of the attached repeater. -
Page 18: Repeater Link To The Computer
As soon as you click on [Configuration], the right configuration screen pops up. Figure 10: SDRe Programming Software Configuration Screen 2.2.1. Repeater link to the computer: You can choose to connect your radios to the computer by USB (default) or TCP/IP media protocol. In case of USB media connection to the radio, it should be required to install the drivers for your USB device. -
Page 19: Software Language
In case you prefer to program the repeater by Ethernet port, then TCP/IP port must be checked and the right IP address of the repeater to be programmed must be indicated into the quick access bar: Figure 11: Selecting IP address from the quick access bar USB or TCP/IP selection may also be done form the bar: Figure 12: Selecting communication media from the quick access bar 2.2.2. -
Page 20: File Operations
3. File operations: 3.1. New program file creation: Evenly when in the future you can use existing files as templates to define the programming file of a repeater, the first time you must start from scratch, cleaning the dashboard. To create a new file you can use the quick access bar then click on the new file shortcut or goes through [File] menu, and then select [New] Figure 14: New file access through File menu... -
Page 21: Saving The Dashboard Information To The Currently Opened File
Figure 15: Accessing to open an existing file or template As soon as you clock on [Open] a windows Explorer screen will help you to find the file. You can also use the shortcut from the quick bar Once you found the file, click on [Open] to load the information into your programming software dashboard. -
Page 22: Repeater And Parameters Configuration
4. Repeater and parameters configuration 4.1. Model selection Once a new file has been initiated, you must define the repeater model to be programmed. Figure 16: Model information access through Edit Menu SDRe software can program any of the SmarTrunk Digital repeater from ST-91XX family, but each repeater requires a proper definition for most of the programming parameters. - Page 23 Figure 17: Model Info Screen To select your desired model, click on the right corner of the model field then a scrollable list will drop down. Figure 18: Model info list To select your model you must press over the right name corresponding to your device.
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Page 24: Repeater Buttons Definition
If your repeater model is not in your list, please update your software. It is important to keep your software updated to ensure any SDRe repeater is into the model info list. If your model is not into the current list, please update your repeater Note: 5 - Incomplete model info list requires software update If you are not sure about your model info, you can read the repeater by pressing the read button on the quick access bar once your... -
Page 25: Long Press Timer
Figure 19: Accessing to Radio Buttons screen As soon as you click on Buttons, a new screen will displayed. Figure 20: Buttons Definition screen 4.2.1. Long Press Timer Each button of your repeater has two functionalities to be assigned. One is that function to be executed when the button is pressed and SDRe Programming Software Revision V1.0 P a g e... -
Page 26: Buttons Actions
released immediately and the other is that function to be executed when the button is pressed by long time. Long Press timer is the minimum time in milliseconds [ms] that a key must be held to be considered as Press and Hold action. This parameter can be adjusted form 100msec up to 2500 msec. -
Page 27: None
Depending on the application firmware loaded into your radio core, some functions may not be allowed to be selected or defined. Depending on the kind of button, some functionalities are not allowed. The actions to be assigned to the buttons are: 4.2.2.1. -
Page 28: Power Up
4.2.2.4. Power Up: Assign this command to change the RF output power selection. This command will jump from Low Power to Mid Power, from Mid Power to High Power, from High Power to Low Power, depending on the current power selection. The absolute power assigned to each power selection must be aligned as per Alignment section descripted on Service manual. -
Page 29: Monitor Momentary
4.2.2.8. Monitor Momentary Assign this function when you want to open the audio path without any signaling or carrier level consideration meantime the assigned button is held. This command only operates on analog and hybrid mode. It cannot be assigned to an instant action button. Only can be used as long press action Note: 7 - Monitor Momentary allowed only to long press actions 4.2.2.9. -
Page 30: Menu
ANT Match: This bar shows you the result of the comparison between the SWR at calibration time related with actual SWR status. 100% means the antenna remains working as at the installation time. Pwr. Forward and Antenna matching must be calibrated once the repeater has been installed by aligning the RF power for the operation frequency, using the proper antenna, duplexer or combiners. -
Page 31: Link Status
4.2.2.13. Link Status Assign this command to check IP link status. The following screen will shows you the complete status: 4.3. Enhanced optional programing On this step, you can configure some networking parameters and services features. Figure 22: Option screen access through Edit Menu bar As soon as you click on Options, the Optional programming features screen will pops up. -
Page 32: Repeater Parameters
Figure 23: Options Program screen To save the setting press [Ok] or [Cancel] to exit without saving the data changes 4.3.1. Repeater parameters This area lest you set some parameters: SDRe Programming Software Revision V1.0 P a g e | 32... -
Page 33: Repeater Name
Figure 24: Repeater Parameters tab 4.3.1.1. Repeater name: This is an Alphanumeric Nickname assigned to the repeater to get an easy access to this reference in the future, when you must administrate a network. 4.3.1.2. Repeater ID: This is a very important parameter in case you define a network of repeaters into the system. -
Page 34: Fan Mode
Press on the arrow to list down the possible values: Figure 25: FAN Setting Auto: The FAN will work controlled by repeater temperature limits programed on the alignment procedure (See ST-9116 Service manual – Alignment). On: The FAN will remains all time on. This option will demand more quiescent current than required becoming inefficient. -
Page 35: Disable Repeater On Low Voltage
4.3.1.5. Disable Repeater on Low Voltage: If the DC voltage is too low, then the repeater will be automatically moved to stand-by mode serving only to emergencies. Figure 27: Disable the repeater on low voltage 4.3.1.6. Power-on Test: Check this box if you want the repeater transmit a test carrier with some specific modulation when turned on as an additional routine to the power-on test. -
Page 36: Repeater Power Save Mode
4.3.1.7. Repeater Power Save mode: In solar powered sites, it is very important to reduce the quiescent current saving battery. Click on the side arrow to select the proper power save mode: Disabled: No power save functions Normal: All internal resources are powered down, but the receiver is all time powered on getting immediate reaction to any call request. -
Page 37: Default Mac Address
Figure 29: IP environment programming tab 4.3.2.1. Default MAC Address: MAC address is a very important security parameter for any IP network and additionally it may be used for external servers to address a particular repeater into your network through the routers. -
Page 38: Ethernet Speed
Figure 31: Sample of MAC Address input 4.3.2.2. Ethernet Speed: Depending of the media quality and the possibilities of you link, you can select the speed for the IP port. Press on the side arrow to slide the menu down then select you desired option: Figure 32: IP port speed and mode selection AUTO: The repeater will negotiate the most convenient... -
Page 39: Ethernet Mdi-X
4.3.2.3. Ethernet MDI-X: Depending of the media type, the polarity of the wiring connection must be normal or crossed. Press on the side arrow to select the appropriate configuration for your network. Figure 33: MDI-X selection Auto: the PHY detects the type of connection adjusting the mode on the fly Normal: Check this one for normal IEEE 802.3 configuration MDI-X: for crossed connections. -
Page 40: Roaming/Servers Configuration
Figure 35: Manual configuration of the IP address IP Address: Fill the IP address for your repeater, separated by dots (IP V4 format). MASK: Fill the MASK to define the sub net of your device. Gateway: Fill the IP address (IP V4 format) for the gateway of your network. -
Page 41: User Database Server
Figure 36: Roamming/Servers definition screen 4.3.3.1. User database Server: In a wide area network, the trunking/system database may be located somewhere in the entire network. If this is the case, you can check this box then fill the IP address assigned to the active user database. -
Page 42: Voice Server
4.3.3.2. Voice Server: In a wide area network, the trunking/system voice resources must be centralized into an external server. This Server will assign the voice logger and the phone line resources in agree to the right network configuration. If you network has a voice server, please check this box and fill the IP Address of you voice server. -
Page 43: Sip Server Ip Configuration
Figure 40: Broadcast configuration for conventional repeater sites 4.3.4. SIP Server IP configuration: On this tab, you can program the IP address of the SIP gateway. This gateway will specify the codec, protocol and routing for any communication exchanged with external switches. Check the box if you want to enable/disable the SIP service. -
Page 44: Single Site Trunking Configuration
4.3.5. Single Site trunking configuration: On this tab you can program the IP address and ports for any repeater into the same site. Multi-site application software is another application. The programming of multi-site trunking networks are outside of the scope of this manual Figure 42: Single Site Trunking configuration Fill the list with the IPs and ports for the repeaters into the same site. -
Page 45: E-Mail Service Configuration
To save changes, press [Ok] or select other tab. If you want to cancel the modifications for this tab, press [cancel]. 4.3.6. E-mail Service configuration: On this tab, you can program the required parameters to support e- mail services. Figure 43: E-mail services configuration 4.3.6.1. -
Page 46: Outgoing Services To The Radios
Check Enable box to activate the service Figure 44: POP3 Service configuration 4.3.6.2. Outgoing Services to the radios: Outgoing e-mails coming from radios to the Internet must be delivered from the repeater using SMTP service. The SDR repeater has the SMPT Bridge embedded. You can activate this service by filling the SMPT server IP address, port and security mode, and then check the Enable box. -
Page 47: Installer Password
Figure 46: Access to Passwords programming screen As soon as you click in [Passwords], the password programming screen will be launched. Figure 47: Installer and Data Base manager password protection screen ST-91XX series offers two level of passwords protection: one for the Technicians who install the repeaters, makes the alignment, hardware programming, etc. -
Page 48: Db Management Password
To protect this repeater area, you must fill Installer Password field and confirmation with key work of 6 numeric characters. Figure 48: Installer password Default Password in 123456. In you do not change it, the repeater never asks for password understanding that it is not required. Programming software send 123456 as default password to connect remotely. -
Page 49: Ctcss Table
4.5. CTCSS Table: The SDR repeaters supports up to 32 private groups into analog or hybrid mode. The signaling used to discriminate the groups is CTCSS. To enable a group, list the right CTCSS into the CTCSS table. Figure 50: CTCSS Table In case you do not fill any CTCSS table, the repeater operates only with the defined CTCSS on the frequency chart. -
Page 50: Analog Profiles
Figure 51: Profiles Menu Access Once you press on [Profiles], a list of possible profiles will be open. If some profiles are on grey, it is because your firmware does not support that service. 4.6.1. Analog Profiles: All common characteristic of any analog profile common to any of the channels in the repeater must be programed on this step and the associated to the right frequencies on the chart later. - Page 51 Figure 52: Accessing to the Analog Profile tab Once you press on [Analog], the Analog Profile menu will be opened: Figure 53: Analog Profile TAB SDRe Programming Software Revision V1.0 P a g e | 51...
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Page 52: Adding A New Analog Profile
4.6.1.1. Adding a new Analog Profile To add a new Analog Profile, get focus on Analog Profiles list then press Insert Key on your keyboard. A new profile with default parameters will be created. Figure 54: Default Analog Profile 4.6.1.2. Edit Analog Profile Name: To edit the analog Profile name, focus your mouse pointer over the Name filed on the Analog Profile TAB, then edit current name... -
Page 53: Selecting The Type Of Audio Filters
Press OK to save the changes. 4.6.1.3. Selecting the type of audio filters Analog signals on SDR repeaters can be fltered on four modes. The standard one is the de/pre-emphasized, but you also can select other modes for some special application. Press on the Audio Filters side arrow to slide down the menu. -
Page 54: Enable The Voice Log Service On Analog Profiles
[Ok] or Cancel if you want to discard the changes. 4.6.1.5. Enable the Voice Log Service on Analog Profiles ST-9116 repeater can log any voice conversation. If you want to activate this service for a particular analog profile, please check this box. -
Page 55: Setup The Repeater Tail
To store this option, click on any part of the tab. To save the value, press [Ok] or Cancel if you want to discard the changes. 4.6.1.7. Setup the repeater tail Fill this field with the length desired for repeater tail. 0 second means no tail. -
Page 56: Release Time For Time-Out Timer Reset
[Ok] or Cancel if you want to discard the changes. 4.6.1.11. Voice inversion encryption setup ST-9116 supports voice inversion encryption for analog profiles. If you want to enable it, please check the [Enabled] box then input the right voice inversion sub-carrier for this profile. -
Page 57: Digital Profiles
Figure 64: Voice Inversion encryption configuration To store the value, click on any part of the tab. To save the value, press [Ok] or Cancel if you want to discard the changes. 4.6.2. Digital Profiles: All common characteristic of any digital profile related to any of the channels in the repeater, must be programed on this step, and then associated to the right frequencies on the chart. - Page 58 Figure 65: Accessing to the Analog Profile tab Once you press on [Digital], the Digital Profile menu will be opened: Figure 66: Digital Profile TAB SDRe Programming Software Revision V1.0 P a g e | 58...
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Page 59: Adding A New Digital Profile
4.6.2.1. Adding a new Digital Profile To add a new Analog Profile, get focus on Digital Profiles area then press Insert Key on your keyboard. A new profile with default parameters will be created. Figure 67: Default Digital Profile 4.6.2.2. Edit Digital Profile Name: To edit the digital Profile name, focus your mouse pointer over the Name filed on the Digital Profile TAB, then edit current name... -
Page 60: Selecting The Type Of Digital Modulation
4.6.2.3. Selecting the type of Digital Modulation Digital Emissions on SDR repeaters can be used on three different modes. FDMA (Frequency Domain Multiple Access), TDMA (Time Domain Multiple Access) or Simplex mode (Transmit and receive on the same frequency. Press on the Digital Mode arrow to slide down the menu. Figure 69: Digital Mode selection for Digital profile FDMA: Transmits a single continuous 4FSK carrier @ 4800bps using ultra narrow band (6.25 Khz Bandwidth) -
Page 61: Enable The Voice Log Service On Digital Profiles
[Ok] or Cancel if you want to discard the changes. 4.6.2.5. Enable the Voice Log Service on Digital Profiles ST-9116 repeater can log any voice conversation. If you want to activate this service for a particular analog profile, please check this box. -
Page 62: Hybrid Mode
Figure 73: Roaming Service Activation for Digital Profiles To store this option, click on any part of the tab. To save the value, press [Ok] or Cancel if you want to discard the changes. 4.6.2.7. Hybrid Mode SDR protocol supports analog and digital modulations on the same channel. -
Page 63: Enable The Call Length Control On Digital Profiles
4.6.2.9. Enable the Call Length control on Digital Profiles If you want Set a limit of minutes for a call length, then fill this field. 0 minute means no limit. Absolute Max call length is 255 minutes. Figure 76: Repeater MAX Call Length on Digital Profiles To store the value, click on any part of the tab. -
Page 64: Adding A Channel To A Memory Channel
This parameter specify the time without any activity of that group to reset the time out timer who controls the max call length. To setup this value, please fill the field. Figure 78: Release time for Traffic Control on Digital Profiles Max Release time length is 255 seconds. -
Page 65: Updating The Rx Frequency Of A Channel
5.1. Updating the RX frequency of a channel: Just click with your mouse on it and type the new frequency value. If the input is wrong, then the RX frequency field will be highlighted on red. 5.2. Updating the TX frequency of a channel Just click with your mouse on it and type the new frequency value. -
Page 66: Changing The Tx Sub Audio Signaling Of A Channel
5.4. Changing the TX sub audio signaling of a channel Just proceed as in the previous item but in TX signaling column. 5.5. Advanced channel configuration After the basic channel information has been loaded, you must double click on the channel number to access to the advanced features programming screen. -
Page 67: Rx Frequency
Figure 82: Channel tag Once selected the right parameter, press [Ok] to save it or [Cancel] to exit. 5.5.1.2. RX frequency: Shows the RX frequency for this channel. You can edit it by direct typing over the field. Figure 83: Channel RX information Once selected the right parameter, press [Ok] to save it or [Cancel] to exit. -
Page 68: Tx Sub Audio Signaling
Figure 84: Channel TX information Once selected the right parameter, press [Ok] to save it or [Cancel] to exit. 5.5.1.5. TX sub Audio Signaling: Shows the CTCSS or DCS information for the current channel. Click on the side arrow then select a different one if you want to change it. -
Page 69: Squelch Sensitivity
5.5.1.7. Squelch Sensitivity Shows the current squelch level for current channel. It means the absolute threshold level to consider if a carrier is present on the receiver. Press on the side arrow to select a new value from a drop down list if you want to change it. -
Page 70: Channel Mode Selection
Press on the side arrow to change it if you want. Possible values: 12.5 KHz. Once selected the right parameter, press [Ok] to save it or [Cancel] to exit. 5.5.1.9. Channel mode selection This option lets you assign existing signaling profile and modulation type for the current channel. -
Page 71: Reading The Repeater Programming From The Device
6. Reading the Repeater programming from the device All the information already downloaded to your radio can be retrieved anytime. In case that information has been protected by password, you must know such critical information to start the reading process. To read the radio file from the repeater, you must connect the radio to the USB port on your computer or by IP, as previously defined on the Programming Software configuration (see 2.2.1), then you can use the... - Page 72 Figure 91: Repeater read progress bar As soon as the reading process ends, a confirmation screen will show you the end of the reading process. Figure 92: read repeater confirmation screen After you got all the information, you can modify it the save or upload again to the radio.
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Page 73: Writing A Radio File
7. Writing a radio file Once you get a program into your programming software ready to upload to a repeater, you must connect the device to the USB port on your computer or remotely through a TCP/IP network, then you can use the shortcut in the quick access bar or you go through [Repeater] then click on [Write Repeater]. -
Page 74: Repeater Alignment
Figure 96: Repeater write confirmation screen Repeater will do a power cycle to load the new parameters after a read or write process. Attempting to upload to a radio will fail if the information generated with the programming software is not for such radio model. - Page 75 Figure 97: Accessing to restore factory default settings As soon as you click on [Factory Reset], a warning message will alert you about the process ready to go. If you are not sure, please press [Cancel]. If you agree, please press [Yes] to continue. Figure 98: warning message before restoring factory default As soon as you press [Yes], the process starts.
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Page 76: Repeater Firmware Update
As soon as this process ends, the radio will do a power cycle to load the new parameters. 10. Repeater Firmware Update: Smartrunk will continue working into the new features and services development for our repeaters so frequently you will find firmware updates into our web site. -
Page 77: Exit From Programming Software
Surf in your computer to select the desired file then connect you repeater to your computer USB port or through a TCP/IP network connection and then press [Start] to initiate the firmware update process. Uploading a wrong firmware to your repeater may cause a permanent damage to the circuitry. Please verify several times that you are ready to upload a firmware version corresponding to your radio model. -
Page 78: Manual Software Update
Figure 103: Exit from SDR programming software Before exit, verify if the current data has been saved. Any change will be lost. Note: 16 - lost data on exit warning note 12. Manual software update You can check for new updates by clicking on [Help] then [Software Update] Figure 104: Manually checking firmware update The software will look for the latest release in our web site. - Page 79 Figure 105: Software up to date confirmation screen If no, the new software will be downloaded automatically. Proceed to install the new software as descripted on 1.1 SDRe Programming Software Revision V1.0 P a g e | 79...
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Page 80: List Of Figures
13. List of Figures Figure 1: SDR programming software welcome screen ................7 Figure 2: SDR programming software file location setup ............... 8 Figure 3: Start Menu destination ......................9 Figure 4: Additional task to be performed by installation software ............. 10 Figure 5: Installation parameters review .................... - Page 81 Figure 45: SMPT service configuration ....................46 Figure 46: Access to Passwords programming screen ................47 Figure 47: Installer and Data Base manager password protection screen ..........47 Figure 48: Installer password ........................ 48 Figure 49: DB Manager Password ......................48 Figure 50: CTCSS Table ..........................
- Page 82 Figure 92: read repeater confirmation screen ..................72 Figure 93: Model error reported when attempting to read a wrong repeater model ......72 Figure 94: Accessing to write the repeater ................... 73 Figure 95: Writing to the repeater progress bar ................... 73 Figure 96: Repeater write confirmation screen ..................
- Page 83 FCC Notices FEDERAL COMMUNICATIONS COMMISSION INTERFERENCE STATEMENT This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. 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.
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