ZETRON 38A User manual

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

Zetron Master Product Manual
Model 38A Part No. 025- 9043Y
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Zetron QC Checklist
✔Unbroken numerical page sequence in each section.
✔Complete front matter consisting of:
Title Page
Table of Contents ( 3 pages)
Statements ( 3 pages)
Other special pages ( 1 pages)
✔Correctly printed photos on:
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Page:
Page:
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1-1 6-10
2-2 7-7
3-13
4-24
5-27
✔Total number of fold-outs: 7 (pages 6-5, 6-6, 6-7, 6-8, 6-9, 6-10, 7-7
✔No other inconsistencies, e.g., light print, missing sections, misaligned pages, bad binders.
Special notes to QC:

Table of Contents
1. INTRODUCTION
INTRODUCTION ...................................................................................................... 1-1
FEATURES ................................................................................................................ 1-1
2. SPECIFICATIONS
GENERAL.................................................................................................................. 2-1
CTCSS / DCS ............................................................................................................. 2-1
INTERFACE............................................................................................................... 2-2
3. OPERATION
OVERVIEW ............................................................................................................... 3-1
CTCSS TONES AND DIGITAL CODED SQUELCH (DCS) .................................. 3-1
HOW TONES/CODES ARE ENABLED .................................................................. 3-2
User Validation ............................................................................................... 3-2
Disabled Tones ............................................................................................... 3-2
Enabled Users, CTCSS / DCS Encode ........................................................... 3-2
Carrier Controlled Repeat (Open Repeater) ................................................... 3-3
Reserved Users ............................................................................................... 3-3
WHAT HAPPENS WHEN A MOBILE UNKEYS....................................................3-3
Airtime Accumulation .................................................................................... 3-5
Repeater Hold Time........................................................................................3-5
Timeout Timer ................................................................................................3-5
Timeout User Identification............................................................................ 3-5
DTMF Regeneration ....................................................................................... 3-5
Airtime Hog Penalty .......................................................................................3-6
Temporary Cross-tone or Cross-code Encoding............................................. 3-6
Temporary Defeat of Cross-tone or Cross-code Encoding............................. 3-6
Remote PTT Function..................................................................................... 3-7
Site Alarm ....................................................................................................... 3-7
CONSIDERATIONS WHEN USING DIGITAL CODED SQUELCH (DCS)......... 3-8
REVERSE FREQUENCY WORKING (OPTION) ................................................... 3-11
Programming................................................................................................... 3-12
4. PROGRAMMING
OVERVIEW ............................................................................................................... 4-1
PROGRAMMING MODES ....................................................................................... 4-1
DTMF Programming Via The Radio Channel................................................ 4-1
Programming Via The Model 8 Repeater Programmer / Timekeeper............4-2
Programming Via The RS-232 Interface ........................................................ 4-3
CRT Mode ...................................................................................................... 4-4
PROGRAMMING COMMANDS.............................................................................. 4-6
Program Mode Access .................................................................................... 4-6
User Commands.............................................................................................. 4-7
System Commands.......................................................................................... 4-13

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 ...................... 5-4
RADIO-SPECIFIC CONNECTIONS ........................................................................ 5-6
GE MASTR III Base/Repeater ....................................................................... 5-7
GE MASTR II Base/Repeater.........................................................................5-8
GE Exec II Base.............................................................................................. 5-9
ICOM IC-RP1510 Repeater............................................................................5-10
E.F. Johnson CR1010 Repeater ...................................................................... 5-11
E.F. Johnson CR1010 Repeater (Alternate Hookup)...................................... 5-12
E.F. Johnson Viking Universal Station........................................................... 5-13
Kenwood TKR-720 / TKR-820 Repeater .......................................................5-14
Motorola GR300 Repeater (or Two GM300 Radios)..................................... 5-15
Motorola MTR2000 Stations .......................................................................... 5-16
Motorola MSF 5000 Analog Repeater............................................................ 5-17
Motorola MSF 5000 Digital Repeater ............................................................ 5-18
Motorola MCR-100 / RADIUS R-100 ........................................................... 5-19
Motorola MICOR Single User Repeater ........................................................ 5-20
Motorola MICOR Community Repeater ........................................................ 5-21
Tait T800 Series Repeater............................................................................... 5-22
Tait T300 Series Radio ................................................................................... 5-23
TONE PANEL PERFORMANCE TEST................................................................... 5-24
RS-232 CABLE DIAGRAMS.................................................................................... 5-25
PROGRAMMING THE MODEL 38 VIA FRONT PANEL CONNECTOR............ 5-26
INSTALLING A NEW PROM................................................................................... 5-27
6. REPAIR
IN CASE OF DIFFICULTY....................................................................................... 6-1
SERVICE NOTES ...................................................................................................... 6-1
MODEL 38 REPEATER PANEL PARTS LIST (702-9075) .................................... 6-2
MODEL 38 REPEATER PANEL ASSEMBLY DIAGRAM.................................... 6-5
MODEL 38 REPEATER PANEL SCHEMATIC (008-9075) ................................... 6-6
MODEL 38 REPEATER PANEL SILKSCREEN (702-9075) .................................. 6-10
7. QUICK REFERENCE

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

1-1
1. INTRODUCTION
INTRODUCTION
The Zetron Model 38 is a flexible repeater panel that provides individualized repeater service
to up to 60 or 68 different customer groups. It is a complete interface between a transmitter
and receiver, providing 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. Nearly all
of the Model 38’s functions can easily be customized for each of the 38 or 50 CTCSS tones
and 22 or 18 digital coded squelch codes.
FEATURES
• Supports 38 or 50 CTCSS user groups, with ToneLock™ high sensitivity decoding
• Supports 18 or 22 digital coded squelch (DCS) codes
• Programmable via RS-232 and DTMF
• Attributes are programmable for each user group
• Remote enable and disable of all tones and DCS codes
• Temporary enable and disable of cross encoding
• Automatic Morse code station identification
• Stuck microphone timeout and identification
• DTMF paging when site alarm triggered
• Vacant tones and codes can be reserved
• Airtime Hog Penalty mode
• Cross-tone, cross-code, tone-code encoding
• Courtesy beeps and tailbips
• Privacy mode to prevent “barge-ins”
• Airtime is tallied for each user group
• Prepaid airtime feature

2-1
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.
Station ID Callsigns configurable for each user group, with independent
activity timers.
Station ID frequency 1,200 Hz; adjustable ±800 Hz. (per FCC rules).
Courtesy tone
frequency
1,000 Hz; adjustable 400 to 3,000 Hz.
Indicators Power, carrier, transmit, decode, encode, DTMF.
Current consumption 350 mA at 13.8 VDC.
Operating voltage 11.0 to 15.0 VDC.
Rack space 1.7 x 19 x 4.8 inches.
Weight 2.2 lb.
Operating
temperature
0 to 65°Celsius.
CTCSS / DCS
CTCSS frequencies 67.0 to 254.1 Hz. Tables include all standard EIA frequencies
and extensions.
CTCSS sensitivity Better than 3dB SINAD.
CTCSS accuracy Better than 0.1 Hz.
Digital squelch codes Selectable, any octal codes between 000 to 777.
Squelch tail
elimination
Compatible with CTCSS reverse burst, DCS turn-off code, and
loss of carrier.

Section 2. Specifications
2-2
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 KΩAC coupled. For connection to unsquelched
discriminator audio.
CTCSS / DCS output Level: 0 to 4 Volts p-p. Impedance: Less than 1 KΩAC
coupled.
Transmitter type Direct FM, or phase modulation. Flat or de-emphasized CTCSS
encode.
Transmitter keying SPDT relay.
Carrier detect Internal noise detector or external carrier detect input. External
input threshold adjustable 0 to 7 VDC.
Adjustments Four adjustments from rear panel: Rx input gain, CTCSS / DCS
encode gain, Tx audio output gain, and carrier detect threshold.
Configuration
switches
Eight switches on rear panel: Rx audio gain high/low, repeat
audio flat/de-emphasized, encode gain high/low, encode flat/de-
emphasized, tx audio gain high/low, COR source
internal/external, COR polarity positive/negative, COR pull up
on/off.
RS-232 serial data
port
Front panel DB9 connector (non-standard pinout). Interface
cables available.
Alarm / Remote PTT
input
Activated via contact closure to ground.
Cables, interface
notes
Available for most repeaters and two-way radios.

3-1
3. 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. The DCS decode numbers are completely user programmable. Two versions of the
Model 38 are available; 38 CTCSS + 22 DCS users (see Table 3. -1), or 50 CTCSS + 18
DCS users (Table 3. -2).
When ordered with the 50 tone set, the unit has a narrower CTCSS decoder bandwidth than
the standard 38 tone version. The 50 tone version is not recommended for use with radios
that use tunable encoders, due to the possibility of the encoder becoming mistuned or drifting
onto adjacent tones.
Table 3. -1. User Number Cross reference Table: 38 Tone Version
User Tone User Tone User Tone User Code
1 67.0 16 114.8 31 192.8 46 DCS
2 71.9 17 118.8 32 203.5 47 DCS
3 74.4 18 123.0 33 210.7 48 DCS
4 77.0 19 127.3 34 218.1 49 DCS
5 79.7 20 131.8 35 225.7 50 DCS
6 82.5 21 136.5 36 233.6 51 DCS
7 85.4 22 141.3 37 241.8 52 DCS
8 88.5 23 146.2 38 250.3 53 DCS
9 91.5 24 151.4 39 DCS 54 DCS
10 94.8 25 156.7 40 DCS 55 DCS
11 97.4 26 162.2 41 DCS 56 DCS
12 100.0 27 167.9 42 DCS 57 DCS
13 103.5 28 173.8 43 DCS 58 DCS
14 107.2 29 179.9 44 DCS 59 DCS
15 110.9 30 186.2 45 DCS 60 DCS

Section 3. Operation
3-2
Table 3. -2. User Number Cross Reference Table: 50 Tone Version
User Tone User Tone User Tone User Tone
1 67.0 18 118.8 35 183.5 52 DCS
2 69.4 19 123.0 36 186.2 53 DCS
3 71.9 20 127.3 37 189.9 54 DCS
4 74.4 21 131.8 38 192.8 55 DCS
5 77.0 22 136.5 39 196.6 56 DCS
6 79.7 23 141.3 40 199.5 57 DCS
7 82.5 24 146.2 41 203.5 58 DCS
8 85.4 25 151.4 42 206.5 59 DCS
9 88.5 26 156.7 43 210.7 60 DCS
10 91.5 27 159.8 44 218.1 61 DCS
11 94.8 28 162.2 45 225.7 62 DCS
12 97.4 29 165.5 46 229.1 63 DCS
13 100.0 30 167.9 47 233.6 64 DCS
14 103.5 31 171.3 48 241.8 65 DCS
15 107.2 32 173.8 49 250.3 66 DCS
16 110.9 33 177.3 50 254.1 67 DCS
17 114.8 34 179.9 51 DCS 68 DCS
HOW TONES/CODES ARE ENABLED
User Validation
The Model 38 is always listening to the receive audio for the presence of an enabled user. All
38 or 50 CTCSS tones and 18 or 22 of the digital codes can be marked as enabled or disabled
(consult the programming section).
Disabled Tones
When a disabled CTCSS tone is detected, the time accumulator will keep track of the airtime
used by that tone. This feature lets the system manager gain information about the CTCSS
tones that are in use on the channel, perhaps by another repeater in the area. The Model 38
will accumulate airtime for all CTCSS tones, but not disabled DCS codes.
Enabled Users, CTCSS / DCS Encode
When an enabled tone or digital code is detected, the transmitter will be keyed. Depending
on programming, the system will: (1) encode nothing, (2) regenerate the received tone or
code, or (3) encode a different tone or digital code (cross-tone encoding).