Hamtronix ELEKTRA 2500 Manual

Hamtronix
VHF/UHF Repeater Controller Board
ELEKTRA 2500/CT
Instruction and Operation Manual
Firmware V2.52
Hardware Rev. B

ELEKTRA 2500 HAMTRONIX
1
QUICK GUIDE .....................................................................................................................................................................................................................................02
TECHNICAL SUPPORT .........................................................................................................................................................................................................................02
PRECAUTIONS....................................................................................................................................................................................................................................02
WARRANTY .......................................................................................................................................................................................................................................02
FIRMWARE UPDATES.........................................................................................................................................................................................................................02
SUPPLIED ACCESSORIES .....................................................................................................................................................................................................................02
CONNECTORS
PINOUT ..............................................................................................................................................................................................................................................04
CN1 –REPEATER (RPT).......................................................................................................................................................................................................................04
CN2 –AUXILIARY (AUX)......................................................................................................................................................................................................................04
CN3 –REMOTE...................................................................................................................................................................................................................................04
INSTALLATION AND TESTS
TURNING ON THE CONTROLLER FOR THE FIRST TIME .......................................................................................................................................................................05
AUDIO SETTINGS................................................................................................................................................................................................................................05
RETRANSMISSION AUDIO ADJUSTMENT............................................................................................................................................................................................05
LEDS...................................................................................................................................................................................................................................................05
TIMED FAN OUTPUT ..........................................................................................................................................................................................................................05
DETERMINING AUXILIARY COR LOGIC................................................................................................................................................................................................06
VIRTUAL ASSITANT.............................................................................................................................................................................................................................06
REPEATER AUDIO FIDELITY.................................................................................................................................................................................................................07
CONTROLL COMMANDS
CONTROLLING YOUR REPEATER OVER THE AIR .................................................................................................................................................................................07
01 –REPEATER TRANSMITTER ENABLE..............................................................................................................................................................................................08
02 –TRANSMITTER HANG TIME (TAIL)...............................................................................................................................................................................................08
03 –TIMER TO COURTESY TONE........................................................................................................................................................................................................08
04 –DURATION OF COURTESY TONE.................................................................................................................................................................................................08
05 –COURTESY TONE FREQUENCY....................................................................................................................................................................................................08
06 –COURTESY TONE SELECTION ......................................................................................................................................................................................................08
07 –ROLLER BEEP .............................................................................................................................................................................................................................09
08 –CONFIRMATION TONE................................................................................................................................................................................................................09
09 –TIME-OUT ACTION......................................................................................................................................................................................................................09
10 –ID TEST .......................................................................................................................................................................................................................................09
11 –REPEATER CTCSS ENABLE...........................................................................................................................................................................................................09
12 –AUXILIARY CTCSS ENABLE...........................................................................................................................................................................................................09
13 –PL/CTCSS FREQUENCY SELECTION..............................................................................................................................................................................................09
14 –ID TIMER.....................................................................................................................................................................................................................................10
15 –ID SELECTION .............................................................................................................................................................................................................................10
16 –CW ID FREQUENCY.....................................................................................................................................................................................................................10
17 –CW ID SPEED ...............................................................................................................................................................................................................................10
18 –CW ID SETUP ..............................................................................................................................................................................................................................10
19 –VOICE ID MESSAGE RECORDING.................................................................................................................................................................................................11
20 –ALARM INPUT.............................................................................................................................................................................................................................11
21 –MONITOR INPUT ........................................................................................................................................................................................................................11
22 –REPEATER PORT .........................................................................................................................................................................................................................11
23 –AUXILIARY PORT........................................................................................................................................................................................................................11
24 –TRANSMITTER TEST....................................................................................................................................................................................................................11
25 –SIMPLEX REPEATER ....................................................................................................................................................................................................................12
26 –REPEATER TIME-OUT..................................................................................................................................................................................................................12
27 to 32 –REMOTE OUTPUTS 1 to 6..................................................................................................................................................................................................12
33 –REPEATER DTMF CONTROL ENABLE..........................................................................................................................................................................................12
34 –DTMF MUTE ENABLE..................................................................................................................................................................................................................12
35 –PASSWORD SETUP.....................................................................................................................................................................................................................12
36 –RESET.........................................................................................................................................................................................................................................13
37 –FULL RESET................................................................................................................................................................................................................................13
38 –VOICE MESSAGE LOCK................................................................................................................................................................................................................13
39 –MULTI-FUNCTION BUTTON........................................................................................................................................................................................................13
40 –VOICE MESSAGE DURATION.......................................................................................................................................................................................................13
41 –VOICE ID PRIORITY......................................................................................................................................................................................................................13
42 –SUPER USER MODE ....................................................................................................................................................................................................................13
43 –COURTESY TONE EDITOR............................................................................................................................................................................................................13
TROUBLESHOOTING..........................................................................................................................................................................................................................14
ACCESSORIES .....................................................................................................................................................................................................................................14

ELEKTRA 2500 HAMTRONIX
2
QUICK GUIDE
The color sequence in the illustration is from network connector type T-568B (reversed pinout). If you are using a different sequence, check page 4 for pinout.
CN1
SIGNAL
COLOR
WHERE TO CONNECT
1
RX1
BROWN
RX AUDIO INPUT (COME FROM RECEIVER DISCRIMINATOR)
2
GND
BROWN/WHITE
COMMON GROUND (FROM POWER SUPPLY/RECEIVER/TRANSMITTER)
3
MIC
GREEN
TX AUDIO OUTPUT (GO TO THE TRANSMITTER MIC/MODULATOR)
4
PTT
BLUE/WHITE
PTT OUTPUT (GO TO THE TRANSMITTER PTT –ACTIVE IN LOW/OPEN COLECTOR)
5
COR1
BLUE
COR INPUT (FROM RECEIVER COR/COS) NOT USED IF USING BUILT IN SQUELCH
6
TONE2
GREEN/WHITE
PL/CTCSS LOGIC INPUT (ACTIVE IN LOW)
8
VCC
ORANGE/WHITE
+ 13.8V DC VCC/170mA max.
Note 1: The input audio should come from the receiver discriminator. The squelch circuit and PL decoder will not work correctly if the audio comes filtered from
headphones or speaker. Cuts during receiving signals (RX1 LED goes off during modulations) is a symptom of filtered audio. If is the case, do not use the built-in
squelch and use COR1 input. Change de J5 jumper to C and select the correct COR polarity in jumper J3.
Note 2: Not used in version 2500CT since there is a built in CTCSS/PL decoder.
Function
Name
Option
Page
01
REPEATER TRANSMITTER ENABLE
[0] OFF, [1] ON
8
02
HANG TIME
[0]-[9] 300ms, 500ms, 1s, 2s, 3s, 5s and 10s
8
03
TIME TO THE COURTESY TONE (also called beep)
[0]-[9] X 50ms
8
04
DURATION OF THE COURTESY TONE
[0]-[9] X 50ms
8
05
TONE FREQUENCY
[0]-[D] X 100Hz starting at 300Hz
8
06
TYPE OF THE COURTESY TONE
[0]=single tone, [1]-[D] multi tone
8
07
ROLLER BEEP
[0]=OFF, [1]=1, [2]=10, [3]=20, [4]=40, [5]=60...
9
08
TYPE OF THE CONFIRMATION BEEP
[0]=no confirmation, [1]=2 tones, [2] melody
9
09
TIME OUT ACTION
[0]=no action, [1]=transmission drop
9
10
ID TEST
[1]=message 1, [2]=message 2, [3]=CW, [4]= FW version and serial number
9
11
REPEATER PORT PL (CTCSS) ENABLE
[0]=OFF, [1]=ON
9
12
AUXILIARY PORT PL (CTCSS) ENABLE
[0]=OFF, [1]=ON
9
13
REPEATER PL (CTCSS) FREQUENCY
[0]-[38]
9
14
ID TIMER
[0]-[7] X 5 min.
9
15
ID SELECTION
[0]=CW, [1]=message 1, [2]=Smart
10
16
CW ID FREQUENCY
[0]-[9] X 100Hz starting at 300Hz
10
17
CW ID SPEED
[1]-[5] (1 slow/5 fast)
10
18
CW ID MESSAGE
[0]-[55]
10
19
VOICE ID MESSAGES
[1]=message 1, [2]= message 2
11
20
ALARM
[0]=OFF, [1]=ON
11
21
MONITORING
[0]=OFF, [1]=ON
11
22
REPEATER PORT ENABLE
[0]=OFF, [1]=ON
11
23
AUXILIARY PORT ENABLE
[0]=OFF, [1]=auxiliary, [2]=ctrl, [3]=link, [4] cross
11
24
TRANSMISSION TEST
[0]=OFF, [1]=carrier, [2]=tone
11
25
SIMPLEX REPEATER ENABLE
[0]=OFF, [1]=ON, [2]=ON + Courtesy tone
12
26
REPEATER TIME OUT
[0]-[9] X 30s
12
27
REMOTE OUTPUT 1
[0]=OFF, [1]=ON, [2]=pulse
12
28
REMOTE OUTPUT 2
[0]=OFF, [1]=ON, [2]=pulse
12
29
REMOTE OUTPUT 3
[0]=OFF, [1]=ON, [2]=pulse
12
30
REMOTE OUTPUT 4
[0]=OFF, [1]=ON, [2]=pulse
12
31
REMOTE OUTPUT 5
[0]=OFF, [1]=ON, [2]=pulse
12
32
REMOTE OUTPUT 6
[0]=OFF, [1]=ON, [2]=pulse
12
33
REPEATER PORT DTMF ENABLE
[0]=OFF, [1]=ON
12
34
DTMF MUTE ENABLE
[0]=OFF, [1]=ON
12
35
PASSWORD SETUP
[#SSSS SSSS#]
12
36
RESET
Restart with the user configuration
13
37
FULL RESET
Restart with factory default configuration
13
38
VOICE RECORDER LOCK ENABLE
[0]=OFF, [1]=ON
13
39
MULTI FUNCTION BUTTON SETUP
[0]=PLAY, [1]=COR/REC, [2]=TX OFF
13
40
VOICE MESSAGE DURATION
[1]=1 message up to 20s, [2]=2 messages up to 10s
13
41
VOICE ID PRIORITY
[0]=low priority, [1] high priority
13
42
SUPER USER MODE ENABLE
[0]=OFF, [1]=ON
13
43
COURTESY TONE EDITOR
[Freq] [Dur] [Int] [Freq] [Dur] [Int] [Freq] [Dur]
13

ELEKTRA 2500 HAMTRONIX
3
TECHNICAL SUPPORT
If any doubt remains after a complete reading of this manual, please visit our web site. You will find last minute
information and a FAQ section with answers to frequent questions.
You can get support by e-mail:
[email protected]
PRECAUTIONS
Please observe the following precaution to prevent radio equipment and controller damage:
•Do not modify controller circuits unless instructed by a Hamtronix documentation.
•Do not place the controller in excessively dusty areas, humid areas, wet areas, nor on unstable surfaces that
may cause short-circuits.
•If abnormal odor or smoke is detected coming from the board, turn off the power immediately and contact
support for help.
•The case is made of a biodegradable material and should not be exposed to high temperatures.
WARRANTY
This Warranty covers all defects in materials and workmanship of this product for the original purchaser. This
Warranty will remain in effect for two (2) years from the date of purchase. This Warranty does not cover damage,
deterioration or failure resulting from:
1) Accident, misuse, abuse, neglect, unauthorized product modification or failure to follow instruction contained
in this manual.
2) Water or other elements.
3) Repair or attempted repair by anyone not authorized by Hamtronix.
4) Any unit which is not new when sold to the first end user or upon which the serial number has been defaced,
modified or removed.
This board must be interconnected with radio equipment or accessories using connectors. Any sign of direct soldering
to the board will void the Warranty.
Hamtronix’s liability is limited to repairing or replacing its own products. Hamtronix shall not be liable for any
damages, whether incidental, consequential or otherwise, because of any defective Hamtronix product.
If it is necessary to send the product for servicing, shipping charges are the responsibility of the applicant.
FIRMWARE UPDATES
Firmware updates, when available, will be published at our web site. Update requests, if compatible with your
hardware, can be requested and will be free of charge during the Warranty period. The controller must be shipped
to Hamtronix for firmware updates. All shipment charges will be paid by customer. Also, an updated microcontroller
will be available for sale in our online web store under parts/service menu.
SUPPLIED ACCESSORIES
•1 ELEKTRA 2500/CT controller board
•1 biodegradable case
•2 cables with one installed RJ45 connector each
•1 bracket
•This printed Instruction Manual

ELEKTRA 2500 HAMTRONIX
4
CONNECTORS
PINOUT
Female CN1/CN2 Male CN1/CN2 Male CN3
CN1 –Repeater (RPT)
Pin
Signal
Color
Description
1
RX1
Brown
RX audio input (come from receiver discriminator)
2
GND
Brown/White
Common ground (from power supply/receiver/transmitter)
3
MIC/MOD
Green
TX audio output (go to the transmitter mic/modulator)
4
PTT11
Blue/White
PTT output (go to the transmitter PTT)
5
COR12
Blue
COR/COS input (from receiver COR/COS) (Max. 15V)
6
TONE12
Green/White
PL/CTCSS logic input
7
FAN3
Orange
Fan output
8
VCC
Orange/White
+ 13.8V DC VCC/170mA max.
Nota 1:Open collector type –active in low - max. 300mA.
Nota 2:COR1: J5 in C position and select the correct COR polarity in J3. Squelch: J5 in S position and J3 in (-).
Nota 3:Active in low (low: < 0.6V/high: > 2.4V and < 5.1V). Not used in model 2500CT.
Nota 4:Open collector type –active in low - max. 300mA. To avoid noises in transmission use AC powered fan.
CN2 –Auxiliary (AUX)
Pin
Signal
Color
Description
1
RX2
Brown
RX audio input (come from receiver discriminator or speaker)
2
GND
Brown/White
Common ground (from power supply/receiver/transmitter)
3
MIC/MOD
Green
TX audio output (go to the transmitter mic/modulator)
4
PTT21
Blue/White
PTT output (go to the transmitter PTT)
5
COR2
Blue
COR/COS input (come from receiver logic)
6
TONE22
Green/White
PL/CTCSS logic input
7
ALM IN
Orange
Alarm input (active when higher than 2V DC (max. 15V)
8
MON IN
Orange/White
Monitoring input (active when higher than 2V DC (max. 15V)
Nota 1:Open collector type –active in low - max. 300mA.
Nota 2:Active in low (low: < 0.6V/high: > 2.4V and < 5.1V).
CN3 –Remote
Pin
Signal
Description
1
OUTPUT 1
Remote Logic Output 1 (OV=OFF/5V=ON)
2
OUTPUT 2
Remote Logic Output 2 (OV=OFF/5V=ON)
3
OUTPUT 3
Remote Logic Output 3 (OV=OFF/5V=ON)
4
OUTPUT 4
Remote Logic Output 4 (OV=OFF/5V=ON)
5
OUTPUT 5
Remote Logic Output 5 (OV=OFF/5V=ON)
6
OUTPUT 6
Remote Logic Output 6 (OV=OFF/5V=ON)
7
GND
Common Ground
Note 1: 10mA per port maximum. Exceeding this limit can damage the microcontroller.
Note 2: These digital output ports are also available in 2500CT model but cannot be used at the same time with the
built in CTCSS decoder. If the decoder is being used and you change a remote output, the frequency of the decoder
will change randomly.

ELEKTRA 2500 HAMTRONIX
5
INSTALLATION AND TESTS
TURNING ON THE CONTROLLER FOR THE FIRST TIME
Be sure the jumper J5 is in S (Squelch) position and J3 in negative position (-). Close SW1 terminal. If you hear the
transmission of a melody, the connections between controller and transmitter are correct. Turn the squelch (SQL)
trimpot fully counterclockwise. Now adjust slowly clockwise until the green LED RX1 goes out. It is recommended to
always close the squelch a little more, as the noise at the reception can vary throughout the day. Transmit to the
repeater input frequency. It should retransmit the signal ending with a courtesy tone, which will indicate that the
connections between receiver and controller are also correct. If the melody is not transmitted or there is not
retransmission, open the SW1 contact and review your CN1 connections. If you prefer to use COR1 instead the
build-in squelch, chance J5 to C (COR) position and select the correct COR1 polarity at J3.
AUDIO SETTINGS
Trimpot
Description
Where acts
RX-1
Repeater input audio level
Input audio coming from the receiver on the repeater port
TX-1
Repeater output audio level
Output audio to the repeater transmitter
RX-2
Auxiliary input audio level
Input audio coming from the receiver on the auxiliary port
TX-2
Auxiliary output audio level
Output audio to the auxiliary transmitter
BEEP
Courtesy Tone and CW level
Audio of courtesy tones, melodies and CW identifier
VOICE
Voice reproduction audio level
Audio of the recorded messages
RETRANSMISSION AUDIO ADJUSTMENT
The amplitude of the retransmitted audio depends on the input (RX-1) and output (TX-1) settings. To keep the
repeater audio amplitude the same as a simplex operation, proceed as follows:
1) Disable the DTMF mute (function 34-0).
2) Connect a multimeter to the headphone output of a transceiver tuned to the repeater frequency output.
3) Ask someone to transmit a DTMF tone for, let´s say, 30s.
4) At the repeater frequency input (press MON / REV in your transceiver) check the mV AC reading.
5) At the repeater frequency output (release the MON / VER) check the mV AC reading.
6) Adjust RX1 and TX1 to obtain the same voltage as in the input frequency.
7) Test with and without de-emphasis jumper J1. Leave it in the position where the audio is best.
LEDs
Label
Color
What it indicates
PWR
Red
Power is on
RX-1
Green
Repeater receiver receiving a signal
TX-1
Red
Repeater transmitting
RX-2
Green
Auxiliary receiver receiving a signal
TX-2
Red
Auxiliary transmitting
DTMF
Yellow
DTMF decoding
CTCSS
Yellow
PL/CTCSS decoding
TIMED FAN OUTPUT
The Elektra 2500 can control fans to cool the
repeater/auxiliary transmitter. When the repeater is in use,
the fan is activated and remains on for 2 minutes after the
transmission ends. The fan is not activated during CW or
voice identifications.
The fan drive output (CN1-7) is an open collector type active
in low. Max. 300mA. See the connection diagram on the left.
Note: DC fans are noisy. Prefer AC fans.

ELEKTRA 2500 HAMTRONIX
6
DETERMINING COR LOGIC
Locate the COS/COR signal on your receiver. This line has a DC voltage that changes when a signal is being received.
If the COR line is 0 volts and goes to a positive voltage when a signal is received it is said to be (positive logic) or
active HIGH. If the COR line is a positive voltage and goes to 0 volts when a signal is received it is said to be
(negative logic) or active LOW. Any voltage under 0.8V is considered low state and greater than 2V high state. If
you receiver has positive COR, jumper J3 (or J4 in case auxiliary port) should be at center and + position. If you
receiver has negative COR, jumper J3 (or J4 in case auxiliary port) should be at center and - position. It is not
necessary to use the input COR1 if using the controller 's internal squelch.
Note: Finding the COR signal on a receiver, according to some customers, is the biggest obstacle to installation. To
meet this demand, we added a squelch circuit that generates its own COR signal, eliminating the need for a COR
connection from the receiver. But keep in mind that using the receiver's own squelch circuit is the most
recommended, since this circuit has been optimized for the specific characteristics of that product. The controller
squelch needs the discriminator signal to work, but the amplitude and frequency response varies depending on the
brand and model, not allowing it to be as efficient as that of the receiver itself. So, if you can choose which one to
use, always prefer the receiver's COR signal.
VIRTUAL ASSITANT
Elektra 2500 is compatible with Virtual Assistants for Artificial Intelligence (Google
Home, Amazon Eco etc.). This allows you to ask questions through the repeater
and get answers on a multitude of subjects. You can ask for the weather forecast,
ask for general information and even schedule ads for specific times. The
prerequisites for installing this functionality are:
•One virtual assistant device
•Availability of Wi-Fi with Internet at the repeater's operating site
•Internal modifications to the assistant device
•Interfacing circuit
Interfacing Google-Elektra
Audio is obtained through the device's internal speaker. In that case, you will need to open it to access the terminals.
Search YouTube for instructions on how to open your virtual assistant.
As the switching power supply of the assistant is noisy, we recommend the use of an audio isolation transformer,
which feeds the signal to the auxiliary port input (CN2-1).
For voice commands, we use the auxiliary port output (CN2-3). As the assistant's microphones are shielded modules
with digital outputs, we cannot interface analog audio directly. The solution was to use a headset speaker to play
the audio close to one of the assistant's microphones. The microphones are located at the edges, aligned to the
LEDs.
For the controller to know when to transmit, we use the circuit below to generate COR based on the lighting of the
assistant's LEDs. Set jumper J3 to positive polarity. Set the auxiliary port to link mode (23-3). Adjust the circuit
potentiometer so that the controller RX2 LED lights up according to the assistant's LEDs.
Initial audio adjustment: adjust the assistant's audio to 50% and set the audio trimpot of the RX2 auxiliary port in
12 o´clock. Ask the assistant any questions via repeater and check that the audio level for the assistant's microphone
is enough for him to respond. If it is too low, increase TX2 or even RX1. The settings TX1, RX2 and the assistant
volume itself influences the level of reproduction. Experiment with the two positions of the J2 de-emphasis jumper
for better reproduction audio.

ELEKTRA 2500 HAMTRONIX
7
REPEATER AUDIO FIDELITY
The fidelity of the retransmission audio not only depends on the audio circuits of the controller, but where you get it from and
where you send it to.
De-emphasis and Pre-emphasis
Before an FM transmitter transmits the audio on the air, the audio coming from the microphone must pass through a pre-emphasis
circuit. This circuit boosts the audio at 6dB per octave. Pre-emphasis is needed in FM to maintain a good signal to noise ratio. At
the receiver side, a de-emphasis circuit takes the unnatural sounding pre emphasized audio and turns it back into its original
response. Pre emphasized audio is available directly from the audio demodulation (discriminator) circuitry.
How to get the best audio quality
As the input audio comes from the discriminator, it is the audio transmitted by the initial user with pre-emphasis. The controller
adds courtesy beeps, identification and other signaling to this audio and directs it to its output. This output must be connected
directly to the transmitter's modulator (after the pre-emphasis circuit), avoiding any additional treatment to the audio. When a
user receives this audio at the destination, a de-emphasis circuit turns it back into its original audio.
How to get these signals on the transceivers
Many current radios now provide discriminator output (flat audio / disc / det) and modulator input (TX 1200/9600 / flat audio) on
interface connectors for packet radio operation. Commercial radios also often have these signals on service / accessories
connectors, such as Motorola and Vertex. Radios without these facilities have these signals internally. To obtain these internal
signals, a certain technical knowledge is required. If you don't know how to do it, ask a technician for help.
Deemphasize selection on the controller
If your repeater transmitter does not have modulator input available in a packet radio or accessory connector and you don´t know
the point internally, install the jumper J1 for deemphasize the incoming audio to use the MIC input of your transmitter.
There are other variables that can affect the audio. In practice, after making the connections, test the retransmission with and
without the de-emphasis jumper and leave it in the position where the audio fidelity is best for your ears.
CONTROLL COMMANDS
CONTROLLING YOUR REPEATER OVER THE AIR
With exception of the squelch and audio levels, all functions are controlled over the air with your radio DTMF keypad.
COMMAND SINTAXES
Commands are as following: SSSSFF0#
Where SSSS is a 4-digit password (default = 1234), FF is a 2-digit function, Ois a 1-digit option and #a enter.
See the command to change the sound of courtesy tone:
1234066#
Your controller will answer valid commands with two high frequency confirmation beeps (function 08 must be
enabled). If the entered command is invalid, a long, low frequency tone will be heard. The command must be entered
completely in one transmission. If you release PTT switch before you complete a command, the entered numbers
will be discarded.
You can enter more than one command without having to release PTT between them. # acts like a command
separator. If entering a command and you made a mistake, just press * to clear the entered string and start over.
To get a correct decoding of DTMF tones, the signal must be free of noises or jamming. If the repeater is busy, wait
until it becomes free prior to sending commands.
Note 1: DTMF commands with incorrect password will not generate an error message. They will just be discarded.
Note 2: DTMF commands with intervals between digits exceeding 2s will be discarded.
Note 3: Some commands don’t require an option or may require extra procedures. These exceptions will be
explained in detail at function description next.
Note 4: Default password is 1234. After getting acquainted with the controller commands, change this password.

ELEKTRA 2500 HAMTRONIX
8
FUNCTION DESCRIPTION
01 –REPEATER TRANSMITTER ENABLE (Default = 1)
This is the master repeater switch. This function must be enabled for normal repeater operation. The Elektra 2500
will continue to respond to DTMF commands and identify even when the repeater's transmitter is disabled. This
function will automatically be enabled after a reset or power up.
0Disable 1Enable
02 –TRANSMITTER HANG TIME (TAIL) (Default = 4)
When not zero, the repeater's transmitter will remain on the air for a selected period before the it drops.
0Drops Immediately
3Hang Time of 1s
6Hang Time of 3s
9Hang Time of 10s
1Hang time of 300ms
4Hang Time of 1.5s
7Hang Time of 5s
2Hang Time of 500ms
5Hang Time of 2s
8Hang Time of 7.5s
Note: This time must be greater than the sum of the time for courtesy tone (function 03) and its duration (function
04) or the courtesy tone will not be heard.
03 –TIMER TO COURTESY TONE (Default = 2)
This function determines the delay after a signal drop on the receiver and the courtesy tone occurs.
0Immediately
3After 300ms
6After 600ms
9After 900ms
1After 100ms
4After 400ms
7After 700ms
2After 200ms
5After 500ms
8After 800ms
04 –DURATION OF COURTESY TONE (Default = 1)
Determine the duration of courtesy tone.
0No Courtesy Tone
3150ms long
6300ms long
9450ms long
150ms long
4200ms long
7 350ms long
2100ms long
5250ms long
8400ms long
Note: This function only affects the single courtesy tone (see function 06). The duration of multi courtesy tones are
not controlled by user, they are pre-determined by the firmware.
05 –COURTESY TONE FREQUENCY (Default = 2)
Determine the frequency of courtesy tone.
0300 Hz
3600 Hz
6900 Hz
91200 Hz
C1500 Hz
1400 Hz
4700 Hz
71000 Hz
A1300 Hz
D1600 Hz
2500 Hz
5800 Hz
81100 Hz
B1400 Hz
Note: This function only acts for single courtesy tone (see function 06). The frequency of multi courtesy tones are
not controlled by user, they are pre-determined by the firmware.
06 –COURTESY TONE SELECTION (Default = 0)
Determine the type of courtesy tone. Only the single tone may have its frequency and duration modified (See
function 04 and 05 for details).
0Single Tone
5Two apart
ADouble Sweep Tone
1Courtesy Tone Editor (See Function 43)
6Plim-Plim
BFour Fast Tones
2Three Crescent Tones
7CW K letter
CSweep Tone
3Three Decreasing Tones
8NASA Quindar
DDroplet
4Fast Tones
9Five Crescents Tones
Note1: Courtesy tone used in the communications of the NASA Apollo project when the Eagle lunar module landed
in the moon. To learn more:
https://www.youtube.com/watch?v=nrzeFNEv150 and https://www.youtube.com/watch?v=oQfMH-perhk

ELEKTRA 2500 HAMTRONIX
9
07 - ROLLER BEEP (Default = 0)
Determine after how many key ups the type of courtesy tone will automatically change.
0Disable
2every 10
4every 40
6every 80
1Each transmission
3every 20
5every 60
7every 100
Note: Options 0 and 1 should only be used for demo purposes, since the constant change of courtesy tones can
cause some users to key up all the time and bother other listeners. If function 06 is used, Roller Beep will be disabled.
08 –CONFIRMATION TONE (Default = 1)
Determine the type of confirmation sound.
0No confirmation sound
1Two high frequency tones
2Melody
09 –TIME-OUT ACTION (Default=1)
When time-out is exceeded, you can choose between transmitter drop until the signal that caused the drop
disappears or just a funeral march sound of warning.
0Timer-out warning sound
1Transmitter drop
Note: If the transmitter drops and the signal that caused the drop is still blocking the repeater, if you have a stronger
signal you can press * to bring the transmitter back.
10 –ID TEST
This function will allow you to test the IDs and check the controller’s version and serial number.
1Voice Message 1 playback
2Voice Message 2 playback
3CW ID
4Software version
11 –REPEATER CTCSS ENABLE (Default = 0)
When enabled, will require a correct CTCSS to operate the repeater port.
0Disable
1Enable
Note: This function should only be activated if there is a CTCSS decoder installed. It can be built-in, as in Elektra
2500CT model, external such as the Hamtronix TED300 module or from inside of the receiver. TONE1 input (CN1-
6) is active with logic level 0 (voltage less than 0.6V) when the correct PL/CTCSS is present. Level 1 (greater than
3V and less than 5.5V) indicates absence of PL/CTCSS.
12 –AUXILIARY CTCSS ENABLE (Default = 0)
When enabled, will require a correct CTCSS to operate the auxiliary port.
0Disable
1Enable
Note: This function should only be activated if there is a CTCSS decoder installed. It can be external such as the
Hamtronix TED300 module or from inside of the receiver. TONE1 input (CN2-6) is active with logic level 0 (voltage
less than 0.6V) when the correct PL/CTCSS is present. Level 1 (greater than 3V and less than 5.5V) indicates absence
of PL/CTCSS.
13 –PL/CTCSS FREQUENCY SELECTION (Default=0)
Sets the frequency of the build in PL/CTCSS decoder of the Elektra 2500CT model.
CTCSS
Option
CTCSS
Option
CTCSS
Option
CTCSS
Option
CTCSS
Option
CTCSS
Option
-
00
85.4
08
110.9
16
146.2
24
183.5
32
210.7
40
67.0
01
88.5
09
114.8
17
151.4
25
186.2
33
218.1
41
69.3
02
91.5
10
118.8
18
156.7
26
189.9
34
225.7
42
71.9
03
94.8
11
123.0
19
159.8
27
192.8
35
229.1
43
74.4
04
97.4
12
127.3
20
162.2
28
196.6
36
233.6
44
77.0
05
100.0
13
131.8
21
167.9
29
199.5
37
241.8
45
79.7
06
103.5
14
136.5
22
173.8
30
203.5
38
250.3
46
82.5
07
107.2
15
141.3
23
179.9
31
206.5
39
254.1
47
Example: To select PL/CTCSS 74.4Hz enter: 123413#04#

ELEKTRA 2500 HAMTRONIX
10
14 –ID TIMER (Default = 1)
Determine how often the ID (voice or CW) will be transmitted.
0No ID
2Every 10 min
4Every 20 min
6Every 30 min
8every 3s
1Every 5 min
3Every 15 min
5Every 25 min
7Every 35 min
Note: Option 08 is available for beacon or fox hunting applications in CW only. Prefer to use the 3s intervals for
sending commands to controller.
15 –ID SELECTION (Default = 0)
Determine which ID will be transmitted. Option 0 and 1 will be transmitted following the time programming on
function 14. Option 2 will not play the ID after the time is exceeded until someone keys up the repeater, when the
message 1 will be played. If the repeater is busy at the time of ID, message 2 will be played as soon as COR is lost.
0CW ID
1Voice Message ID
2Smart Voice Message ID
Note: If the repeater is busy at the time of ID for option 1, the voice will give a place for CW ID. This behavior can
be changed with function 41. Option 2 will only be available if two messages are selected at function 40.
16 - CW ID FREQUENCY (Default=7)
Determine the CW ID Tone Frequency.
0300 Hz
3600 Hz
6900 Hz
91200 Hz
C1500 Hz
1400 Hz
4700 Hz
71000 Hz
A1300 Hz
D1600 Hz
2500 Hz
5800 Hz
81100 Hz
B1400 Hz
17 –CW ID SPEED (Default = 4)
Determine the speed for CW ID.
1Slowest
2Slow
3 Medium
4Fast
5Faster
18 –CW ID SETUP
A maximum of 20 characters is available for CW ID message. See an example for programming the word “TEST” in
CW:
Enter: 123418#2005192005#
If the entered string is valid, you will hear the ok confirmation and the CW ID will play.
Note: If you make a mistake when entering the string, just press * to clear the string and start over.
CODES FOR CW PROGRAMMING
LETTER
CODE
CW
LETTER
CODE
CW
LETTER
CODE
CW
A
01
.-
T
20
-
. (AAA)
39
.-.-.-
B
02
-...
U
21
..-
Space
40
space
C
03
-.-.
V
22
...-
= (BT)
41
-...-
D
04
-..
X
23
-..-
: (OS)
42
---...
E
05
.
Y
24
-.--
; (KR)
43
-.-.-.
F
06
..-.
W
25
.--
( (KN)
44
-.--.
G
07
--.
Z
26
--..
) (KK)
45
-.--.-
H
08
....
1
27
.----
# (HH)
46
……..
I
09
..
2
28
..---
/ (DN)
47
-..-.
J
10
.---
3
29
...--
“ (AF)
48
.-..-.
K
11
-.-
4
30
....-
$ (SX)
49
...-..-
L
12
.-..
5
31
.....
‘ (WG)
50
.----.
M
13
--
6
32
-....
_ (IQ)
51
..--.-
N
14
-.
7
33
--...
+ (AR)
52
.-.-.
O
15
---
8
34
---..
* (SK)
53
...-.-
P
16
.--.
9
35
----.
? (IMI)
54
..--..
Q
17
--.-
0
36
-----
> (CT)
55
-.-.-
R
18
.-.
- (DU)
37
- ..-..-
S
19
...
, (MIM)
38
--...--

ELEKTRA 2500 HAMTRONIX
11
19 –VOICE ID MESSAGE RECORDING
The maximum recording time is 20s. If you choose Smart ID (function 15-2), this time will be split in two, resulting
in two 10s messages each. After sending the command, release PTT switch and the next key up will be recorded
and played back after recording. The voice ID time interval is the same as function 14.
1–Message 1 record
2–Message 2 record
Ex: To record a message press: 1234191#
Note: Don’t exceed the maximum time selected or the messages may become overlapped. Function 38 (Voice
Message Lock) must be disabled in order to record the voice message or you will get an error alert. Besides over
the air recording, you can use an external source of audio by using the K1 audio jack. Use the same commands as
you would by on the air recording, but when pressing the PTT, the external audio will be recorded instead.
20 –ALARM INPUT (Default = 0)
This alarm input is available for violation detection for windows, doors or repeater cabinet. Using any kind of detector
or sensor, a GND signal must be present all the time connected to alarm input (CN2-7) in order to not trigger the
alarm. If this ground signal is missing, the alarm will be triggered and stay in alarm until a command is sent to turn
it off. A siren sound will be transmitted over the air.
0Disable
1Enable
Note: Even with alarm activated the repeater will still be available for communication, but the siren sound will return
as soon as the communication ends.
21 –MONITOR INPUT (Default = 0)
A monitor input is available for lost AC voltage or logic state monitoring. When this input (CN2-8) is open or high
(5V), a short tone will precede the regular courtesy tone otherwise (low) nothing happens.
0Disable
1Enable
Note: Due to a pull-up resistor this input will be considered high if not connected.
22 –REPEATER PORT (Default = 1)
If disabled, the repeater will only accept signals coming from the link port.
0Disable
1Enable
Note: This function only can be disabled if link port is enabled.
23 - LINK PORT (Default = 0)
0 –Disable
Signals from link port will be discarded
1 –Auxiliary
Allow access to repeater coming from another frequency (high priority)
2 –Control
Allow control access coming from another frequency (high priority)
3 –Link
Link operation (no hang time for signals coming through this port)
4 –Cross
Cross repeater operation
24 –TRANSMITTER TEST (Default = 0)
0Disable
1Carrier
2Carrier with Tone
Note: This option has no time-out. Make sure your transmitter can stay keyed up for extended periods without
overheating. The tone frequency will be the same as simple courtesy tone (function 05)

ELEKTRA 2500 HAMTRONIX
12
25 –SIMPLEX REPEATER (Default = 0)
Does not require separate receiver and transmitter. Even an HT can be used for this. When enabled, any incoming
signal will be recorded and played back. The duration of each transmission should not exceed 20s or it will be
cropped. Due to its low cost, simplex repeater mode can be invaluable for emergency and expedition purposes.
0Disable
1Enable
2Enable with courtesy tone
Note: As use the space for voice message ID, all prior contents will be lost. Function 38 must be disabled in order
to use this function.
26 –REPEATER TIME-OUT (Default = 6)
Determines the maximum allowed time for each transmission. 10 seconds before the time is up, a short beep will
indicate that the time-out time has almost been reached. After time-out, a melody will be heard, and the transmitter
may or may not drop depending on the setting of function 09. If dropped, will remain that way until the COR that
caused the time-out is dropped.
0No time-out
260s (1min)
4 120s (2min)
6180s (3min)
8240s (4min)
130s
390s
5150s
7210s
9270s
Note: The timer counter is reset at courtesy tone. If the signal that caused the time-out drop is still on the receiver
holding the transmitter keyed, you can send * to bring it back (your signal must be stronger in order to gain control). 
27 to 32 –REMOTE OUTPUTS 1 to 6 (Default = 0)
6 remote outputs are available for general purpose use.
0Disable
1Enable
2Pulse (inverts state for 100ms)
Example: To enable output 5 press: 1234311#

Note: These outputs are CMOS logic and can drive a maximum of 10mA each. If you need to interface with a relay,
use a transistor as a buffer. In model 2500CT, this output should not be used if build-in CTCSS decoder is being
used. Changing remote outputs will cause CTCSS frequency to change randomly.

33 –REPEATER DTMF CONTROL ENABLE (Default = 1)
You can disable the repeater port from accepting DTMF commands when the link port is up, and you can control it
by another frequency on the link port.
0Disable
1Enable
Note: You can’t enable this function if the link port is down.
34 - DTMF MUTE ENABLE (Default = 0)
When enabled, anytime a DTMF tone is received, the audio will be muted to the Repeater's transmitter. The transmit
audio will remain muted for 2s after the last DTMF tone is received. This feature prevents control commands from
being repeated. It provides an extra measure of security. There may be times when it is desirable to pass the DTMF
tones through the repeater and you can disable this function.
0Disable
1Enable
Note: Do not use excessive levels at RX-1 trim pot because saturated audio with high tone voices may fool the
DTMF decoder and cause an undesirable mute over a voice communication.
35 –PASSWORD SETUP (Default = 1234)
To change the password.
If the actual password is 1234 and you want 5678 press: 123435#56785678#
Note: The new password is entered twice for security purposes.

ELEKTRA 2500 HAMTRONIX
13
36 - RESET
Restart the microcontroller with user programmed values. A melody is heard to indicate a successful reset. Have the
same effect as power up.
Ex: 123436#
Note: The voice message and CW programming are not affected.
37 –REMOTE FULL RESET
Restart the microcontroller and all functions with default values.
Ex: 123437#
Note: The voice message and CW programming are not affected.
38 –VOICE MESSAGE LOCK (Default =1)
This is a security measure to protect the voice message from being erased by mistake. To be able to record a voice
message or use the Simplex Repeater function, this function must be disabled.
0Voice Lock Disable
1Voice Lock Enable
39 –MULT-FUNCTION BUTTON (Default = 2)
Determine the action of button S1.
0PLAY
Starts message 1 playback
1COR/REC
COR simulation (acts like a REC button after function 19 to record a message)
2TX OFF
Drops transmitter (Useful when checking for duplexer desense)
40 –VOICE MESSAGE DURATION (Default = 1)
1One 20s message
2Two 10s messages
41 –VOICE ID PRIORITY (Default = 0)
When repeater is busy, and the ID time is up or the voice is playing back and a signal is received, the voice will be
replaced by CW ID. If this option is enabled, the voice message will not be replaced.
0Disable
1 Enable
42 –SUPER USER MODE (Default = 0)
If enabled, the password will not be required. Just enter the function and option.
0Disable
1Enable
Note: The Master Reset is not available in this mode.
43 –COURTESY TONE EDITOR (Default=611 611 61)
You can create your own exclusive courtesy tone. The courtesy tone can be composed by 3 tones and you can
control the interval, duration and frequency of each one. This function acts on the simple tone (Function 06-1).
0
300 Hz
3
600 Hz
6
900 Hz
9
1200 Hz
C
1500 Hz
1
400 Hz
4
700 Hz
7
1000 Hz
A
1300 Hz
D
1600 Hz
2
500 Hz
5
800 Hz
8
1100 Hz
B
1400 Hz
[F][D][I] [F][D][I] [F][D]#
F=Frequency, D=Duration e I=Interval
Try the following combinations: 830 330 62, 230 430 62 and 722 742 00 (CW letter A).
To enter the first example, press: 1234 43 # 830 330 62#
Note: Zero duration tone will not be transmitted.

ELEKTRA 2500 HAMTRONIX
14
TROUBLESHOOTING
In case of malfunction, perform a Full reset so that the values programmed by the manufacturer are reestablished.
In this way all options of the functions return to the default values. It can be performed in three different ways:
1) Over the air, using a function 37: Enter: 123437#
2) Over the air, using the master password. Enter: NNNN123#

Where NNNN is a 4-digit master password for full reset from the back cover If the master password is 6986,
the command would be: 6986123#
Note: The Master password cannot be changed by the user, so keep that password confidential. This
command is not available if the controller is running in Super User mode (function 42).
3) On the controller board, using the multifunction button: Switch off the controller by opening the SW1
switch; keep the multifunction button pressed; turn on the SW1 switch (the green RX1 LED will light); wait
for it to flash (up to 20s) and then release the button. An open squelch noise followed by the startup melody
will be transmitted and all functions will return to their default values.
Note: The recorded messages and CW programming are not affected by any of the reset methods.
If the problem persists, contact technical support.
ACCESSORIES
•7” Mini rack (Motorola) box
•TED300 Encoder / Decoder CTCSS module
•SSM350 Super Squelch Module
For more details on these accessories visit www.hamtronix.com

Serial Number
2592
Firmware Version
2.52
Master Password
0592
Hamtronix
www.hamtronix.com
www.hamtronix.com.br
© 2000 - 2021