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ZETRON 38A Instruction Manual

Repeater tone panel
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ZETRON
Model 38A Repeater Tone Panel
Instruction Manual
Part No. 025-9043Y
Please check for change information at the end of this manual.
Copyright © 1986 - 1999 by Zetron, Inc.
All Rights Reserved

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Summary of Contents for ZETRON 38A

  • Page 1 ZETRON Model 38A Repeater Tone Panel Instruction Manual Part No. 025-9043Y Please check for change information at the end of this manual. Copyright © 1986 - 1999 by Zetron, Inc. All Rights Reserved...
  • Page 2 Zetron Master Product Manual Model 38A Part No. 025- 9043Y Special Instructions for Printer None Zetron QC Checklist Unbroken numerical page sequence in each section. Complete front matter consisting of: Correctly printed photos on: Title Page Page: Table of Contents ( 3 pages)

  • Page 3: Table Of Contents

    Table of Contents 1. INTRODUCTION INTRODUCTION ...................... 1-1 FEATURES ........................ 1-1 SPECIFICATIONS GENERAL........................2-1 CTCSS / DCS ......................2-1 INTERFACE....................... 2-2 OPERATION OVERVIEW ....................... 3-1 CTCSS TONES AND DIGITAL CODED SQUELCH (DCS) ........3-1 HOW TONES/CODES ARE ENABLED ..............3-2 User Validation ....................
  • Page 4 Table of Contents (Continued) List And Airtime Functions ................4-20 Diagnostic Commands ..................4-21 5. INSTALLATION GENERAL........................5-1 REQUIRED EQUIPMENT ..................5-1 SCREW TERMINAL CONNECTIONS ..............5-1 INSTALLATION PROCEDURE................5-2 Installation Tips ....................5-2 ADJUSTMENT PROCEDURE USING THE DTMF PROGRAM MODE ....5-3 ADJUSTMENT PROCEDURE USING THE SITE ALARM INPUT ......
  • Page 5 Table of Contents (Continued) DTMF REMOTE PROGRAMMING MODE NOTES ..........7-1 MODEL 38 SYSTEM PROGRAMMING LOG ............7-2 MODEL 38 CTCSS USER DATABASE PROGRAMMING LOG ......7-4 MODEL 38 DCS USER DATABASE PROGRAMMING LOG ......7-6 MODEL 38 PROGRAM MODE COMMAND SUMMARY........7-7 CHANGE INFORMATION...

  • Page 6: Introduction

    CTCSS encode/decode, repeat audio processing, and all timer functions. It can be remote-controlled from a variety of sources. The Model 38A is equipped with an RS-232 serial port for connection to computers and modems. An internal database keeps track of all airtime use and, for accounting purposes, downloads into a PC.

  • Page 7: Specifications

    2. SPECIFICATIONS GENERAL Radio interface Compatible with most any commercial FM two-way radio or repeater. User group capacity 38 CTCSS tones and 22 DCS codes, or 50 CTCSS tones and 18 DCS codes. Airtime capacity 249 hours, 59 minutes, 59 seconds per user group. Airtime retrieval RS-232 port, DTMF or Morse code over radio channel.

  • Page 8: Interface

    Section 2. Specifications INTERFACE Connections Rx audio, Tx key, CTCSS / DCS encode, Tx audio (mic), 12 VAC or DC power, ground. Optional carrier detect, alarm input and aux output. Connector type Detachable screw terminal. Rx input impedance 50 KΩ AC coupled. For connection to unsquelched discriminator audio.

  • Page 9: Operation

    OVERVIEW This section of the manual covers key ideas and features that define the operation of the Model 38A Repeater Tone Panel. CTCSS TONES AND DIGITAL CODED SQUELCH (DCS) The Model 38 monitors the channel for CTCSS tones and/or DCS codes. When a tone or code is detected, it is converted into a User-Number that contains the user privileges and attributes.

  • Page 10: How Tones/Codes Are Enabled

    Section 3. Operation Table 3. -2. User Number Cross Reference Table: 50 Tone Version User Tone User Tone User Tone User Tone 67.0 118.8 183.5 69.4 123.0 186.2 71.9 127.3 189.9 74.4 131.8 192.8 77.0 136.5 196.6 79.7 141.3 199.5 82.5 146.2 203.5...

  • Page 11: Carrier Controlled Repeat (Open Repeater)

    Section 3. Operation Carrier Controlled Repeat (Open Repeater) The Model 38 can be programmed to activate based on just carrier. In this mode the Model 38 will provide simultaneous tone and open repeater operation; users that have CTCSS or Digital Squelch encode operate normally, users that have no encode repeat also. This allows a mix of CTCSS tone users with open repeat capability and is ideal when adding tone users to an existing open repeater.
  • Page 12 DTMF. This allows the system manager to identify which users are active on the system in real time. All that’s required is a DTMF decoder with display capability, such as the Zetron Model 8 Repeater Programmer / Timekeeper.

  • Page 13: Airtime Accumulation

    The Model 38 may be used to regenerate DTMF tones over the radio channel for applications involving mobile DTMF decoders or control station telephone interconnects (such as Zetron Models 30 or 45). DTMF regeneration ensures that all DTMF signaling occurs at the same tone level.

  • Page 14: Airtime Hog Penalty

    Section 3. Operation Airtime Hog Penalty The Airtime Hog Penalty feature allows the system manager to penalize “airtime hogs” so that other users on the system have a chance to complete dispatch calls. This feature disallows a user from conversing through the repeater for a penalty duration (programmable 10-9990 seconds) if the user has recently exceeded the maximum allowable conversation time limit (1-99 minutes).

  • Page 15: Remote Ptt Function

    This can be used to monitor external functions such as system break-in or power failure. The alarm DTMF code can be received by a Zetron Model 8 Repeater Programmer / Timekeeper for remote alarm monitoring. Whenever the alarm input is held in the active state, a 2000 Hz confirmation beep tone is sent over the transmit audio just prior to unkeying when the repeater is in use.

  • Page 16: Considerations When Using Digital Coded Squelch (Dcs)

    Section 3. Operation CONSIDERATIONS WHEN USING DIGITAL CODED SQUELCH (DCS) When a DCS radio unkeys, it sends a 134.4 Hz squelch tail elimination turn off code bit sequence for about 120 milliseconds. To avoid potential problems, users should not be installed on the adjacent CTCSS frequencies of 131.8 and 136.5 if possible.
  • Page 17 Section 3. Operation Table 3. -3. Commonly Used DCS Codes, with Binary and Hex Shown Code Binary Code Binary 11101100011100000010011 640E37 01110001101100011001001 498D8E 11010110111100000010101 540F6B 11011000110100011001101 598B1B 11001011101100000010110 340DD3 00110010110100011010101 558B4C 10100011111100000011001 4C0FC5 01000111110100011011001 4D8BE2 10111110101100000011010 2C0D7D 01011010100100011011010 2D895A 00010111110100000011110 3C0BE8 01010010111100011100011 638F4A...
  • Page 18 Section 3. Operation Table 3. -4. Normal and Inverted DCS Codes Normal Inverted Normal Inverted Normal Inverted 3-10...

  • Page 19: Reverse Frequency Working (Option)

    Some radios have the ability to send a DTMF sequence when the channel is changed. This would then completely automate operation. If the dispatch radio does not have a DTMF capability, then a Zetron ZMX microphone could be used. This could have two speed dials programmed to allow switching modes from a single button press.

  • Page 20: Programming

    Section 3. Operation Programming In order for RFW to be used, two users must be enabled on the Model 38. An example of this programming shown in Table 3. -5. The necessary system programming is shown in Table 3. Table 3. -5. RFW User Programming User 10 - Dispatcher User 15 - Radio fleet 1.

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