Model RM-20
Repeater Maker plus
CES Wireless Technologies Corp.
925-122 South Semoran Blvd., Winter Park, FL 32792
(407) 679-9440
support@ceswireless.com
www.ceswireless.com
MAN79 Version 1.2
Updated 31-Jan-10
Printed in USA
Table of Contents
INTRODUCTION........................................................................................................................................................................... 3
SPECIFICATIONS & FEATURES ............................................................................................................................................. 5
1.0 GENERAL DESCRIPTION .................................................................................................................................................. 6
2.0 INSTALLATION INSTRUCTIONS .................................................................................................................................... 7
2.1 GENERAL INFORMATION......................................................................................................................................................... 7
2.2 MATERIAL AND EQUIPMENT REQUIRED FOR INSTALLATION.................................................................................................7
2.3 MECHANICAL INSTALLATION................................................................................................................................................. 7
2.4 ELECTRICAL INSTALLATION................................................................................................................................................... 7
2.5 COMPONENT LAYOUT............................................................................................................................................................. 8
2.6 RADIO INTERFACE CONNECTION............................................................................................................................................ 8
2.7 INTERCONNECT INTERFACE PINOUT ......................................................................................................................................9
2.8 PROGRAMMING INTERFACE CONNECTOR PINOUT................................................................................................................. 9
2.9 JUMPERS.................................................................................................................................................................................. 9
2.10 RADIO AND AUXILIARY RELAY INTERFACE.J3- DB-15..................................................................................................... 10
2.11 INTERCONNECT INTERFACE J1-DB-9................................................................................................................................ 11
2.12 LEVEL ADJUSTMENTS......................................................................................................................................................... 12
3.0 PROGRAMMING PROCEDURES ...................................................................................................................................13
3.1 PROGRAMMING THE RM-20................................................................................................................................................. 13
3.2 PROGRAMMING TABLE SUMMARY.......................................................................................................................................14
4.2 CTCSS TONE TABLE............................................................................................................................................................ 19
4.3 MORSE CODE TABLE ............................................................................................................................................................ 19
4.0 USER CODE CHART............................................................................................................................................................20
5.0 CIRCUIT DIAGRAM........................................................................................................................................................... 21
6.0 AMENDMENTS.................................................................................................................................................................... 22
CES SUPPORT 407-679-9440 Page 2 MAN79 © CES 2009
Warranty
CES Wireless Technologies Corp. warrants this product to be free from defects in material and workmanship for
three years from date of shipment. If such malfunction occurs, it will be repaired or replaced (at our option) without
charge for materials or labor if returned to the factory. This warranty does not apply to parts damaged due to
improper use- including accident, neglect, unreasonable use, and improper installation - or to unauthorized
alterations or modifications of the equipment. It does not extend to damage incurred by natural causes such as
lightening, fire, floods, or other such catastrophes, nor to damage caused by environmental extremes, such as power
surges and or transients. It does not extend to microprocessors if is determined that the failure of a micro is due to
static damage, application of improper voltages to the unit, or other problems nor related to circuit design. In such
case or in the case of a desire to update the micro to a different version of software, such request must be specified
in writing, and there will be a charge agreed upon by both parties.
This product is warranted to meet published specification and to operate as specified only when properly installed in
radio equipment which complies with US FCC specification and the applicable radio manufacturer’s specifications.
CES is not responsible for any operational problems caused by system design, outside interference, or improper
installation. Installation and programming of this CES product must be completed by a qualified two-way radio
technician or engineer.
Equipment for repair may be returned to the factory, freight prepaid, only with prior authorization. Please call 407679-9440 for an RMA number. A brief letter describing the nature of the defect should be included with the
merchandise. Repair by other than CES will void this guarantee. In-warranty merchandise must be shipped, freight
prepaid, to CES. CES will return the repaired or replaced equipment to purchaser, within the United States.
This warranty applies to the original purchaser of the equipment only. CES is not liable under this warranty, or any
implied warranty, for loss of use or for other consequential loss or damage experienced by the purchaser. Some
states do not permit the exclusion or limitation of implied warranties or consequential damages. This warranty
provides special legal rights, and the purchaser may have other rights that vary from state to state.
Copyright
The information in this manual, and any software in this product remains the property of CES. Reproduction,
duplication, or disclosure is not permitted without the prior written consent of CES. CES reserves the right to
change products, specifications, and installations data at any time, without notice.
All information contained in this document is carefully prepared and offered in good faith as a guide in the
installation, operation, use and servicing of our products. Installers must insure that the final installation operates
satisfactory, within relevant regulatory requirements. We accept no responsibility for incorrect installation.
A CES PUBLICATION Copyright CES 1974-2010
Introduction
CES SUPPORT 407-679-9440 Page 3 MAN79 © CES 2009
Thank you for choosing the RM-20 Repeater maker plus.
This product has been carefully engineered and manufactured to provide reliable service in virtually any wireless
communications system. Occasionally, particular systems may require special functions not available in standard
products. Please call your CES Applications Engineer to discuss special applications to meet other needs.
Because we are engaged in a program of continual product development, the specifications and descriptions outlined
in this manual are subject to change. Please consult the amendment section for changes.
When you call CES for support, you will be asked for the version number of this manual. A manual is shipped free
with each RM-20. If you do not have a manual, we are unable to provide telephone support. Manuals can be
ordered from the CES Sales Department.
At CES, we strive to bring you products that meet your needs. If you have any comments about our products,
manuals or service please call CES at 407 -679-9440, and thank you for your continued support.
CES SUPPORT 407-679-9440 Page 4 MAN79 © CES 2009
SPECIFICATIONS & FEATURES
Features:
Rugged construction for harsh environments
Multi-user tone panel - up to 4 user groups
Cross-tone encoding supported
Programmed using DTMF telephone handset or over the air
Optional plug in voice delay module
Power and repeat inhibit switches
Auxiliary relay controlled via programmable DTMF code
Benefits:
Create a repeater using two transcievers
Provide a backup repeater for continious duty systems
Make a single/cross band repeater
Provide a “portable” repeater
Provide a multi user CTCSS repeater system
Specifications:
Dimensions: 4 x 4 x 1.5 inch.
Weight: 0.5 lb.
Cabinet: Aluminum Extrusion
Voltage: 12 V DC
Current Idle 30.7mA Transmit 90.00mA
Interface Cable: 6 ft shielded 9 conductor cable and RM-20 connectors provided
Potentiometers for level adjustments:
Receive Audio, Transmit Audio, CTCSS Output, Courtesy Beep, COR Threshold
Radio Interface Connections:
Power 5.5 - 18 V DC, reverse polarity protected
Ground To transceiver ground
PTT Relay Normally open, closed and common, connected to microphone PTT
Auxiliary relay Normally open, closed and common. For user application.
RX Audio Connected to discriminator or to squelched audio if transceiver has a suitable COR,
level adjustable.
TX Audio Normally connected to microphone audio, level adjustable.
COR Required only if RX Audio input is connected to squelched audio.
Interconnect Interface Connections:
PTT, RX Audio, Ground, TX Audio, COR and 12V
CES SUPPORT 407-679-9440 Page 5 MAN79 © CES 2009
1.0 General Description
This manual provides detailed information regarding the installation, operation, and maintenance of the
CES model RM-20 Repeater Maker plus.
The CES RM-20 is an advanced low cost, compact microprocessor controlled repeater controller unit that can make
a repeater out of just about any two transceivers. The standard features and versatility makes this an ideal choice for
commercial, industrial or amateur use.
The M-20 Repeater Maker plus includes:
Programmable Roger Beep
Programmable disconnect time out timer with disconnect warning beeps
Programmable hang time
Auxiliary relay controlled with programmable DTMF string
PTT relay
Power, COR and PTT LED’s
Power and repeat front panel switches
Repeat inhibit digital input with programmable polarity
Up to 4 programmable CTCSS encode/decode
Internal COR (discriminator)
External COR with programmable polarity
External interconnect DB-9 connector (pinout compatible with 4700VP Telephone Interconnect)
Programmable interconnect repeat audio function
Programmable Morse code ID
Internal 8 pin connector for 4700DB audio delay module
Local or over the air programming
Low current draw
CES SUPPORT 407-679-9440 Page 6 MAN79 © CES 2009
2.0 Installation Instructions
J2 Interconnect
J3 Radio Interface
2.1 General Information
Installation of the model RM-20 should be performed by a qualified two-way radio or communications technician.
Ensure that static precautions are observed and that power is not applied during installation.
Shielded audio cable should be used for all audio signal line connections to the transmitter-receiver combination.
Terminate ground shields at the DB9 connector only to prevent hum and noise due to ground loops. The shield at
the other end of the cable must be left unconnected. The best location for the units is as close as possible to the
transmitter-receiver combination, thus allowing the shielded cables and wires to be as short as possible.
2.2 Material and Equipment Required for Installation
The following items are needed in order to install the model RM-20:
#2 Phillips screwdriver
Solder and soldering iron
Service monitor or deviation meter (optional for transmitter deviation)
1/8” flat blade adjustment tool or jeweler’s screwdriver
Oscilloscope or RMS meter voltmeter
A DTMF telephone Handset
Digital Multimeter
Portable transceiver programmed with same frequencies as the receiver and transmitter interfaced with the
RM-20
2.3 Mechanical Installation
Place the RM-20 on any surface away from sources of extreme heat or cold. The RM-20 should be close to a good
grounding system if at all possible for maximum lightning protection.
2.4 Electrical Installation
Electrical installation of the model RM-20 involves connections to a radio receiver and transmitter via J3 (DB-15
male). An optional connector J2 (DB-9 female) is provided for the connection of a telephone interconnect such as
the CES model 4700VP. Figure 1 shows the rear panel of the RM-20. Table 1 shows functional information for
each pin of the DB-15 male on the rear panel. Table 2 shows functional information on each of the interconnect pins
of the (DB-9 female) connector. And Table 3 shows the RM-20 programming jack.
Fig. 1.0 RM-20 Rear Panel Diagram
J1
Prog
CES SUPPORT 407-679-9440 Page 7 MAN79 © CES 2009
2.5 Component Layout
Fig.2.0
RM -20 BOARD LAY OUT
J3 J2
JP4
R69
JP5
U6 U3
JP7
JP8
Y1
R40
JP6
U7
R37 R25
JP2
TP2
TP3
U4
U5
TP4
U8
2.6 Radio Interface Connection
J1
R24
K1
U2
JP1
JP3
F1
K2
Y2
U1
TP1
SW1SW2
Pin Function Signal Description
1 PTT, NO --------------- PTT relay, normally open
2 PTT, NC --------------- PTT relay, normally closed
3 AUX. COMMON --------------- Auxiliary relay, common
4 TX DISABLE Input -35 to 35 volts, switch @ 2.5v, 47k pull up to 12v
5 TX CTCSS Output CTCSS Output to Transmitter
6 TX AUDIO Output Transmit (Repeat) audio to Transmitter
7 RX AUDIO Input Receive audio from Receiver
8 GROUND --------------- Ground
9 PTT, COMMON --------------- PTT relay, common
10 AUX. NO --------------- Auxiliary relay, normally open
11 AUX. NC --------------- Auxiliary relay, normally closed
12 NO CONNECTION
13 COR (Channel Busy) Input -35 to 35 volts, switch @ 2.5v, 47k pull up to 12v
14 GROUND --------------- Ground
15 12 VOLTS Input Fused & reverse polarity protected
CES SUPPORT 407-679-9440 Page 8 MAN79 © CES 2009
Table 1. Radio and Auxiliary Interface (DB-15) male connector
2.7 Interconnect Interface Pinout
Pin Function Signal Description
1 PTT Input -35 to 35 volts, switched @ 2.5v, 47k pull up to 12v
2 RX audio Output Interconnect receive audio
3 Mode Input -35 to 35 volts, switched @ 2.5v, 47k pull up to 12v
4
5 Ground -------------- Interconnect ground
6 TX audio Input Interconnect transmit audio
7 TX disable Input Same as radio connector pin 4
8 COR Output COR and CTCSS logic, open collector, 47k pull up to 12v
9 12 volts Output Interconnect 12 volts, not reverse protected
Table 2 Interconnect interface (DB-9) female connector
2.8 Programming Interface Connector Pinout
Pin Function Signal Description
1 N/A
2 Tip
3 Ring
4 N/A
Table 3 Programming connector (RJ11)
2.9 Jumpers
Jumper No. Function Description Default Position
JP1 Future enhancements N/A
JP2 CTCSS TX output High Z
Low Z
JP3 Future enhancements N/A
JP4 RX audio input High Z
Low Z
JP5 TX audio output High Z
Low Z
JP6 CTCSS high pass filter 300 Hz high pass filter in
300 Hz high pass filter bypass
JP7 CTCSS high pass filter 300 Hz high pass filter in
300 Hz high pass filter bypass
JP8 Voice audio delay (optional) No audio voice installed
Audio voice installed
IN
OUT
OUT
OUT
OUT
OUT
IN
IN
--
OUT
IN
--
OUT
IN
OUT
IN
OUT
IN
IN
OUT
IN
OUT
CES SUPPORT 407-679-9440 Page 9 MAN79 © CES 2009
Following are instructions for each connection and adjustment that is required by the RM-20 for proper pperation.
Installation procedure will be outlined first followed by the adjustment procedures. All connections to the radio (s)
are made via the rear panel DB-15 connector, and should be performed by a qualified two-way radio or
communications engineer. Ensure that static precautions are observed and that power is not applied during
installation. Shielded audio cable should be used for all audio signal line connections to transmitter-receiver
combination. Terminate ground shields at DB-15 connector only to prevent hum and noise due to ground loops. The
shield at the other end of the cable must be left unconnected. Place the unit as close as possible to the transmitterreceiver combination, thus allowing the shielded cables and wires to be as short as possible. Once the installation
has been successfully completed, continue with the adjustment section of the manual. Do not program the RM-20
until all the installation and adjustments have been successfully completed.
2.10 Radio and Auxiliary relay interface. J3-DB-15
Pin 1- PTT-NO
Connect to the Push to Talk of the transmitter. This is normally connected at the microphone PTT input.
*** See Pin 9 (PTT Common)***
Pin 2- PTT-NC
This connection is generally not used. In applications where two RM-20’s are used for cross-band applications, this
contact may be used. See Figure 3.0
Pin 3- Aux. Common
(optional)
Pin 4- TX Disable
This is an input that (when active) disables the RM-20s repeat and decode functions. This connection is typically
used if two RM20 are used in a cross-band application. The active state of this input is programmable.
Pin 5- CTCSS TX
If CTCSS is to be used on the repeater system, this connection must be made to a suitable tone injection point in the
transmitter. Consult the manual and/or schematic of your transmitter for this connection. The radios microphone
audio input cannot be used for this connection.
Pin 6- TX Audio
This connection is normally made to the transmitter microphone high input.
Pin 7- RX Audio
Some consideration must be given to this input. The RM-20 must have a way to determine when there is activity on
the receiver. If this input is connected to the IF detector (discriminator) output of the receiver, the RM-20s internal
squelch circuit will provide the carrier detection. If a filtered or squelched audio source is used, then the internal
squelch circuit will not function properly and an additional connection (External COR) will be required.
Also, if it is intended for the RM-20 to decode CTCSS (Sub Audible Tone), then this input must be connected to the
discriminator.
Pin 8- Ground
Connect this pin to the common ground on the radio. If external power supply is used, tie all the grounds together.
CES SUPPORT 407-679-9440 Page 10 MAN79 © CES 2009
Pin 9- PTT Common
Most transmitters require a ground for transmitter keying , in this case connect pin 9 to ground. In cases where
positive voltage is required for keying, connect this pin to the appropriate voltage source.
Pin 10- Aux. NO
(optional)
Pin 11- Aux. NC
(optional)
Pin 12-
(Not used)
Pin 13- External COR Input
This connection is optional. The RM-20 can determine the presents or absents of a carrier either by its internal
squelch circuit (see pin7 RX Audio) or the External COR Input. If squelched or filtered audio will be used for the
RX Audio connection, then this connection will be required. Connect this input to a point in the receivers squelch
circuit that changes state when the radio is receiving a signal (squelch is open). This signal must be a DC change
that swings between 1 volt or lower to 3 volts or higher. The active state of this input is programmable.
Pin 14-Ground
(same as pin 8)
Pin 15- 12V DC
Connect to a source of regulated, filtered 12VDC supply. If separate power supplies are used for the transmitter and
receiver units, the power source for the RM-20 should be the one used to power the receiver. This will lessen the
chance of problems due to voltage fluctuation when the transmitter keys and unkeys.
Note: Pins 3, 10, and 11 are the auxiliary relay contacts. This programmable relay can be used to control external
circuitry. A pre-programmed code will enable and disable the relay over the air. To program a code refer to the
programming section in this manual.
2.11 Interconnect Interface J1- DB-9
The RM-20 provides an interconnect interface connector on the rear panel (pin by pin compatible with our model
4700VP). Following is a list of pins and functions of J1.
Pin 1 Push to Talk
Pin 2 RX Audio
Pin 3 Interconnect mode
Pin 4 N/C
Pin 5 Ground
Pin 6 TX Audio
Pin 7 TX Disable
Pin 8 COR
Pin 9 12 V DC
CES SUPPORT 407-679-9440 Page 11 MAN79 © CES 2009
2.12 Level Adjustments
RX Audio
Inject a signal modulated with a 1 kHz tone at 4 KHz deviation into the receiver. Adjust R37 for 500 mV p-p at
TP2. If this level is difficult to obtain, install or remove JP4 as follows. If level at TP2 below the 500 mV and R37
is at maximum, install JP4. If level is too sensitive at TP2 remove JP4 (factory default) and readjust.
Internal COR mobile detector
This adjustment sets the threshold for the RM-20s internal squelch circuit. This setting is critical for proper
operation of the RM20. Apply power to the RM-20 and radios. Disable the transmitter via TX disable switch on the
front panel of the RM-20. Then turn R23 clockwise until the COR LED (DS2) illuminates, then turn R23
counterclockwise just until the COR LED extinguishes. Generate carrier to the receiver and verify that COR LED
illuminates when carrier is present and extinguishes when carrier is removed. The COR is now set correctly.
Note: Not required if external COR is used for carrier detection
TX / Repeat Audio
Inject a signal modulated with a 1 kHz tone at 4 kHz deviation into the receiver, and with TP2 adjusted to 500 mV
p-p (175 mV rms.) adjust R69 for 4 KHz deviation measured with a deviation meter or service monitor on the
transmitter frequency. If this level is difficult to obtain, install or remove JP5 as follows. If deviation is above 4 KHz
and R69 is at minimum, remove JP2 (factory default). If deviation is below 4 KHz and R69 is at maximum install
JP2 and readjust.
Roger Beep (if enabled)
Apply and remove carrier to the receiver and listen for the beep. If adjustment is needed, repeatedly apply and
remove carrier in to the receiver to activate the beep. Adjust R40 until the desired level is obtained.
CTCSS RX
This level is also controlled with R37 (RX audio level control) and theoretically the RX Audio adjustment procedure
above should be sufficient. However in cases where not enough audio level is obtained at TP2, increasing R37 will
bring this level to a reliable operating range. The microprocessor will accurately decode CTCSS from 100 mV to 2v
p-p. It is suggested that the input level at TP2 be kept at between 500 to 750 mV p-p.
Note: RECEIVE AUDIO MUST BE CONNECTED TO THE DISCRIMINATOR OF THE RECEIVER FOR THIS FEATURE TO OPERATE.
CTCSS TX
A CTCSS TX tone must be programmed prior to performing this adjustment. (Refer to the programming section on
this manual). Apply carrier to the receiver and monitor the transmitter frequency. Adjust R25 for 800 Hz deviation.
If this level is difficult to obtain install or remove JP2 as follows: if not enough CTCSS signal is obtained with R25
at maximum, install JP2. If the adjustment is too sensitive, remove JP2 (factory default) and readjust.
CES SUPPORT 407-679-9440 Page 12 MAN79 © CES 2009
3.0 Programming Procedures
3.1 Programming the RM-20
Programming procedures
The model RM-20 can be easily programmed locally with a standard DTMF telephone. Programming can also be
achieved “over the air” with a DTMF microphone.
Note: Programming over the air requires a program access code. This code must be programmed locally on initial
installation.
Local programming
Local programming is accessed by plugging a DTMF telephone handset into the programming jack (J1) on the rear
panel of the RM-20. To access the local program mode, turn the power off and back on and press the * (asterisk)
key within two seconds of applying power to the unit. The RM-20 will generate a series of beeps to the
programming telephone earpiece acknowledging the program mode entry. An easy way to insure that the * is
received within 2 seconds is to have the * key pressed as power is applied, then release it as soon as the tone is
heard.
Over the Air programming
The model RM-20 can also be programmed over the air using a DTMF microphone or a portable radio equipped
with DTMF keypad. However an “over the air” program code (up to 9 digits) must be programmed into the unit. It
is suggested that this code is programmed on initial installation. Once an “over the air” programming code is
programmed, the RM-20 can be easily accessed and programmed over the air. Simply send the access code
accompanied by carrier and monitor the transmitter frequency. If successfully entered in the program mode a series
of beeps will be heard. Proceed to enter the program codes needed to be programmed by pressing each key slowly
and firmly and monitor the frequency for the acknowledge tones. The programming code entry sequence is exactly
the same as in local programming mode. Once the unit is programmed, press (00#) to exit the program mode.
To assist the programming process, a number of confidence toned will heard. They are:
Valid parameter beep One 1 KHz tone (e.g. 1#)
Code accepted Five 1 KHz tones (e.g. 1#0#)
Error beep Three 400 Hz tones (e.g. 80#)
CES SUPPORT 407-679-9440 Page 13 MAN79 © CES 2009
3.2 Programming Table Summary
Code Function Range Default value
00 # Exit program mode n/a n/a
1 # COR Source 0 or 1 0 (discriminator)
2 # External COR polarity 0 or 1 0 (active low)
3 # Roger beep 0 ~ 2 1 (enabled)
4 # CTCSS TX (tone 1) 0 ~ 50 0 (disabled)
5 # CTCSS RX (tone 1) 0 ~ 50 0 (disabled)
6 # CTCSS TX (tone 2) 0 ~ 50 0 (disabled)
7 # CTCSS RX (tone 2) 0 ~ 50 0 (disabled)
8 # CTCSS TX (tone 3) 0 ~ 50 0 (disabled)
9 # CTCSS RX (tone 3) 0 ~ 50 0 (disabled)
10 # CTCSS TX (tone 4) 0 ~ 50 0 (disabled)
11 # CTCSS RX (tone 4) 0 ~ 50 0 (disabled)
12 # CTCSS tone during hangtime 0 or 1 0 (disabled)
13 # CTCSS tone 1 0 or 1 0 (disabled)
14 # Repeater hangtime 0 ~ 9 2 (2 seconds)
15 # Interconnect PTT input 0 or 1 0 (disabled)
16 # Interconnect PTT input polarity 0 or 1 0 (active low)
17 # Interconnect mode input 0 or 1 0 (active low)
18 # Interconnect output polarity 0 or 1 0 (active low)
19 # Interconnect active period 0 ~ 60 3 (3 seconds)
20 # Interconnect repeat 0 ~ 2 1 (enabled)
21 # Morse code ID send 0 ~ 3 0 (disabled)
22 # Morse code ID interval timer 0 ~ 90 3 (3 minutes)
23 # TX time out timer 0 ~ 90 2 (2 minutes)
24 # TX time out penalty 0 ~ 30 0 (disabled)
25 # TX disable input 0 or 1 0 (disabled)
26 # TX disable input polarity 0 or 1 0 (active low)
27 # COR Only produces CTCSS 0 ~ 4 0 (disabled)
28 # Auxiliary relay code 8 digits max. (null)
29 # Morse code ID (call letters) 9 digits max. (null)
30 # Over the air programming code 9 digits max. (null)
99 # Program factory default n/a n/a
Programming Parameters Explained
The following is a list of available programmable features. Parameters in bold letters denotes factory defaults.
(00# will exit the program mode).
COR Source (1#) (Means in which the RM-20 determines receiver activity)
The model RM-20 can be programmed for internal or external COR. Internal COR which is the factory default
requires that the RX Audio input be connected to the discriminator of the receiver. (See RX Audio description)
Otherwise, the External COR input must be used and this item programmed to “External COR” To program this
item enter the command code followed by a 1 or 0, (don’t forget to enter a # (pound ) key between commands and at
the end of the entry sequence).
1#0# = internal 1#1# = external
CES SUPPORT 407-679-9440 Page 14 MAN79 © CES 2009
Table 4 Programming Summary
External COR polarity (2#)
External COR signal can be active high or active low. If this signal is normally at a low state goes to a high state
when carrier is detected (receiver squelch is open), program the polarity to active high. If this signal does the
opposite, program it to active low. (See Description of External COR input) To program this item enter the
command code followed by a 1 or 0, (don’t forget to enter a # (pound) key between commands and the end of the
entry sequence).
2#0# = active low 2#1# = active high
Roger beep (3#)
The courtesy beep has three programmable options: (1) A tone will be generated every time the receiver carrier goes
away, (2) it also can be programmed to send a tone after one second after receiver carrier goes away or (3) can also
be turned off. To program this feature enter the command code followed by a 1 or 0, (don’t forget to enter a #
(pound ) key between commands and the end of the entry sequence).
3#0# = off 3#1 = on 3#2# = on with 1 second delay after receiver carrier goes
away
CTCSS (Continuous Tone Coded Squelch or Sub Audible Tone)
The RM-20 supports up to four (4) CTCSS TX tone pairs. Within each pair a separate transmit and receive tone
frequency can be programmed. For example, tone #1 can receive a specific tone and transmit the same tone or it can
receive one tone and transmit a different tone. Each tone pair works independently from each other. Codes 4#, 6#,
8#, and 10# correspond to TX tones 1, 2, 3, and 4 respectively. And codes 5#, 7#, 9#, and 11# to RX tones 1, 2, 3,
and 4 respectively. If all receive tones are disabled, the RM-20 will operate on COR only. Refer to tone chart in this
manual for tone number and frequency.
CTCSS during hangtime (12#)
When this code is enabled, the RM-20 will generate a CTCSS tone for the duration of the hangtime. A CTCSS TX
tone must be programmed. To program this feature enter the command code followed by a 1 or 0, ( don’t forget to
enter a # (pound ) key between commands and the end of the entry sequence).
12#0# = disabled 12#1# = enabled
CTCSS Tone 1 command (13#)
This feature limits “over the air’ programming access to carriers with CTCSS tone 1. If this feature is enabled,
programming over the air and the auxiliary relay will be inaccessible unless the codes are accompanied by the
correct CTCSS tone. To enable or disable this feature, enter the command code followed by 0 or 1. (don’t forget to
enter a # (pound) between commands and the end of entry sequence).
13#0# = disabled 13#1# = enabled
Hang-time timer (14#)
This code will control the time which the transmitter will stay keyed after COR and CTCSS (if programmed) goes
away. The hangtime period can be programmed for up to nine seconds at one second intervals. To program the
hangtime period enter the command code followed by number of seconds required, (don’t forget to enter a # (pound)
between commands and the end of entry sequence). It can also be disabled if no hangtime is needed. The factory
default for this feature is 2 seconds.
14#0# = disabled 14#2# = 2 seconds
Interconnect PTT in (15#)
This code is only used in applications where a telephone interconnect (Phone Patch) is used in conjunction with the
RM-20. When enabled, it will control the PTT on the RM-20. This input can be programmed for active high or
active low. To program this feature enter the command code followed by a 1 or 0, (don’t forget to enter a # (pound )
key between commands and the end of the entry sequence).
15#0# = disabled 15#1# = enabled
CES SUPPORT 407-679-9440 Page 15 MAN79 © CES 2009
Interconnect PTT in polarity (16#)
This code enables and disables the interconnect PTT input when a telephone interconnect (Phone Patch) is
connected via J1. To enable this feature enter the command code followed by the 1 or 0 (don’t forget to enter a #
(pound) between commands and that the end of the entry sequence.
16#0# = disabled 16#1# = enabled
Interconnect mode input polarity (17#)
This command is only used if an interconnect is used in conjunction with the RM-20. If an interconnect is used,
connect pin 3 of J1 to the connect circuit on the interconnect and program for the proper polarity. To program this
feature enter the command code followed by a 1 or 0, (don’t forget to enter a # (pound) key between commands and
the end of the entry sequence).
17#0# = active low 17#1# = active high
Interconnect COR out polarity (18#)
This output controls the interconnect mobile detect polarity (COR). To program this feature enter the command code
followed by a 1 or 0, (don’t forget to enter a # (pound) after each command and at the end of sequence).
18#0# = active low 18#1# = active high
Interconnect active timer (19#)
This timer will control the time period in which the RM-20 will stay inaccessible after a phone call is terminated.
This code is programmable for up to 90 seconds at 1 second intervals. If cover tones are used (code 20#2# ) set this
parameter to zero. To program this feature enter the command code followed by the number of seconds. (don’t
forget to enter a # (pound ) key between commands and the end of the entry sequence).
19#3# = 3 seconds 19#0 through 90# = 0 through 90 seconds
Interconnect repeat (20#)
This parameter determines what audio is transmitted while an interconnect call is in progress. This feature consists
of three programmable parameters, Enabled, Disabled or Cover Tone. When enabled, the RM-20 will transmit both
(Land Line and Mobile Operator) sides of telephone interconnect audio. When Disabled, only the Land Line (Telco)
audio will be transmitted .If programmed for cover tone, the RM-20 will generate a series of short beeps over the air
while the mobile operator is transmitting. This serves as to indicate that the channel is in use while keeping the
mobile operator side of the audio muted for privacy purposes.
Note: IF COVER TONE IS ENABLED,VERIFY THAT CODE 19#(INTERCONNECT ACTIVE PERIOD) IS SET TO ZERO.IF CODE
19#IS SET TO ANYTHING OTHER THAN ZERO,THE COVER TONES WILL BE TRANSMITTED OVER THE AIR UNTIL THIS TIME
EXPIRES.
Morse code ID send (21#)
This code controls how often the Morse code identification is sent. There are four programmable parameters in this
feature, Off, Timer, COR inactive for 3 seconds, and Timer / COR inactive. When programmed for Timer the RM20 will ID at the interval that code 22# is programmed for. If programmed for COR inactive for 3 seconds, the RM20 will ID 3 seconds after COR has been inactive. Programming it for Timer/COR inactive for 3 seconds the RM20 will ID when the timer (code 22#) has expired and every time COR goes inactive for 3 seconds.
21#0# = off 21#1# = timer
21#2# = COR inactive for 3 seconds 21#3# = timer and COR inactive for 3 sec.
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Morse code ID time interval (22#)
This command controls the time interval in which the RM-20 transmit the ID call letters. This feature is
programmable for up 90 minutes at 1 minute interval (1 through 90) and up to two hours with code 22#0#.
22#0# = 2 hours 22#3# = 3 minutes
Note: The initial ID will be generated at 5 minutes regardless of the time interval programmed, and at the rate on
which the time interval is programmed for thereafter.
TX time out timer (23#)
This timer will control how long the transmitter will stay keyed continuously. This command can be programmed for
up to 90 minutes at 1 minute interval and up to 2 hours with command 23#0#.
23#0# = 2 hours 23#2# = 2 minutes
TX time out timer penalty (24#)
The TX time out timer will control how long the RM-20 will remain inactive after the TX time out timer (Code
23#) has expired. If the RM-20 stayed keyed for the length of the TX time out timer, the unit will unkey the
transmitter and will stay in the idle mode until the TX time out timer penalty has expired. Once this timer has
expired the unit will switch back to normal operation. This code is programmable for no penalty or up to 30 seconds
at 1 second interval.
24#0# = no penalty 24#1 through 30# = 1 through 30 seconds
TX disable in (25#)
This code is normally used when two RM-20’s are used for crossband application in order to keep both RM-20’s
from transmitting at the same time. To program this feature enter the command code followed by a 1 or 0, ( don’t
forget to enter a # (pound ) key between commands and the end of the entry sequence).
25#0# = disabled 25#1# = enabled
TX disable in polarity (26#)
This code controls the polarity of TX disable (code 25#) This command can be programmed for active high or active
low. To program this feature enter the command code followed by a 1 or 0, ( don’t forget to enter a # (pound ) key
between commands and the end of the entry sequence).
26#0# = active low 26#1# = active high
COR only with CTCSS (27#)
This parameter enables the generation of CTCSS when the RM-20 is in “COR Only” repeat mode. This mode is
enabled by setting all CTCSS RX program locations to 0 (Off). In this mode the unit can generate (transmit)
CTCSS even though it does not require CTCSS to be received.
To program this feature enter the command code as follows:
0=Off 1 = CTCSS #1, 2 = CTCSS #2, 3 = CTCSS #3, 4 = CTCSS #4
Don’t forget to enter the # (pound) key between commands and the end of the entry sequence.
27#0# = Off 27#1# = Transmit CTCSS Transmit Tone 1
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Auxiliary relay code (28#)
The RM-20 is equipped with a auxiliary relay. This relay can be used to control external circuitry or devices by
sending a code in DTMF format to the RM-20. A DTMF code (8 digits maximum) followed by digit 1 will energize
the relay and a DTMF code followed by digit 0 will de-energize the relay. The normal state of this relay is disabled.
When the enable code is received, the relay will energize and remain in this condition until the disable code is
received. If power is removed from the RM-20 the relay will revert to its disabled condition. To program this feature
with a code of 12345678 enter the following:
28#12345678#.
To control the relay enter the following:
123456781 to enable it or 123456780 to disable it
Note: If code 13# is enabled, the auxiliary relay can only be accessed by the proper code accompanied by the correct
CTCSS tone programmed on CTCSS RX tone1 (code 5#)
Morse code ID letters (29#)
A Morse code ID can be sent based on a timer, when COR /CTCSS are deactivated or both. When programming the
ID call letters, each character is entered by pressing two (2) numeric keys. This code cannot exceeds 9 characters in
length. To program a call letter ID enter the command code (28#) followed by the 2 numerical keys for each
character followed by the # ( pound ) key. Refer to the Morse code table in this manual.
Example:
To program the call letters KYZJ103 enter the following sequence,
29# 52 93 03 51 10 00 30 #
Over the Air Programming Code (30#)
The over the air programming code must be programmed into the unit before it will work (no factory default).
This code can be up to 9 digits long. To program this code enter the programming mode locally, then program the
remote programming code.
Example: To program a code of 1234 enter 30# 1234#
Factory defaults (99#)
When in the program mode and this code ( 99# ) is entered, the RM-20 will immediately load the factory default
values and any previous programmed parameters will be lost. Refer to programming table summary on this manual
for factory default values.
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4.2 CTCSS Tone Table
Tone Number Tone Number
Off 0 156.7 26
67.0 1 159.8 27
69.3 2 162.2 28
71.9 3 165.5 29
74.4 4 167.9 30
77.0 5 171.3 31
79.7 6 173.8 32
82.5 7 177.3 33
85.4 8 179.9 34
88.5 9 183.5 35
91.5 10 186.2 36
94.8 11 189.9 37
97.4 12 192.8 38
100.0 13 196.6 39
103.5 14 199.5 40
107.2 15 203.5 41
110.9 16 206.5 42
114.8 17 210.7 43
118.8 18 218.1 44
123.0 19 225.7 45
127.3 20 229.1 46
131.8 21 233.6 47
136.5 22 241.8 48
141.3 23 250.3 49
146.2 24 254.1 50
151.4 25
4.3 Morse Code Table
Char Code Char Code Char Code Char Code Char Code
0 00 A 21 K 52 U 82 Ñ 44
1 10 B 22 L 53 V 83 Ö 45
2 20 C 23 M 61 W 91 CH,S 35
3 30 D 31 N 62 X 92 AR 07
4 40 E 32 O 63 Y 93 ERR 48
5 50 F 33 P 71 Z 03 , 16
6 60 G 41 Q 02 Ä 37 - 66
7 70 H 42 R 72 Á 38 . 46
8 80 I 43 S 73 É 39 / 36
9 90 J 51 T 81 Ü 47 ? 94
SPACE 05
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4.0 User Code Chart
Code Function
00 # Exit program mode
1 # COR Source
2 # External COR polarity
3 # Courtesy beep
4 # CTCSS TX (tone 1)
5 # CTCSS RX (tone 1)
6 # CTCSS TX (tone 2)
7 # CTCSS RX (tone 2)
8 # CTCSS TX (tone 3)
9 # CTCSS RX (tone 3)
10 # CTCSS TX (tone 4)
11 # CTCSS RX (tone 4)
12 # CTCSS tone during Hang-time
13 # CTCSS tone 1
14 # Repeater Hang-time
15 # Interconnect PTT input
16 # Interconnect PTT input polarity
17 # Interconnect mode input
18 # Interconnect output polarity
19 # Interconnect active period
20 # Interconnect repeat
21 # Morse code ID send
22 # Morse code ID interval timer
23 # TX time out timer
24 # TX time out penalty
25 # TX disable input
26 # TX disable input polarity
27 # COR only produces CTCSS
28 # Auxiliary relay code
29 # Morse code ID (call letters)
30 # Over the air programming code
99 # Program factory default
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5.0 Circuit Diagram
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6.0 Amendments
Manual revised 01/31/10 5:26 PM
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