FAQ - Frequent Asked Questions

HAM300/CRD300 - CONTROLE REMOTO DTMF

Which cellular phone is compatible? 

Any device with a headphone output jack and auto answer function, usually available in all today cellular phones.

How to activate auto answer function in my cellular phone?

Normally this option is in the settings of the accessories menu. Just activate it. Note that on some mobile brands such as Nokia, this option is only available when a headset is connected and the headphone icon is shown in the display.

How to connect a cellular phone to the board?

HAM300/CRD300 just need the audio signal (to decode the DTMF tones), the microphone signal (to send confirmations) and ground. These signals can be obtained via the headphone jack of the phone. You can use the own plug and cable that normally accompanies your device. These three signals are connected to the front panel connector.

Every cell phone has a feature called auto attendant. This function must be activated so that it meets when you get a call. Note that some devices, like the Nokia brand, allow the activation of ATM function if the headset is connected.

What is an open collector output?

It is an output which when switched off has no signal present (high impedance). When switched on, presents a voltage close to zero volts as if it is grounded. This type of output is common in digital circuits to drive external devices like relays or LEDs. In case of using a relay, one side of the relay coil is connected to it and the other side of the coil to 12 volts DC.

Is possible to increase the number of control outputs?

Yes, just connect the audio and microphone signals from two or more HAM300/CRD300 in parallel, multiplying the number of outputs. For example, if you need 18 outputs, connect three HAM300/CRD300, each with a different password and same number of rings before answering. When you call them, they all answer, but only one will recognize the correct password.

How can I tell that the command was received and executed?

The HAM300/CRD300 have an audible confirmation beep for all commands. If you send a command to turn an output on and the command is accepted and executed successfully, you will receive two short beeps confirming the operation. If you turn an output off, you will get a long beep. For the pulse command a short beep is sent, and in case of unrecognizable command a long beep will alert you to try again.

Can I operate the HAM300/CRD300 via LAN or the Internet?

Yes, with the aid of an Ethernet/Serial adapter (third party product not sold by Hamtronix). These adapters usually have a web interface that allows the sending of commands through RS232 serial port.

What is the difference between versions A, B and C?

All three versions can be controlled by any audio source containing DTMF signaling, such as cellular telephone and radio transceivers. The version B adds besides these options the possibility of also being controlled by landline telephone. Version A, the most complete, offers landline and also an RS232 serial port, which allows control via computer or even via network.

What is the difference between CRD300 and HAM300?

The CRD300A is the same board that goes inside the HAM300, only without universal switched power supply, cabinet and outlets, but sold for a lower price.

ELEKTRA 2000 - REPEATER CONTROLLER

What is C.O.R.? 

C.O.R. is an abbreviation of Carrier Operated Relay. It is a signal from the receiver that tells the controller when the squelch is open (signal present) or closed (no signal present). Typically when the squelch is closed there are a voltage above 2 volts and when opened a voltage near to zero volts (negative C.O.R). 

How to get the C.O.R signal from a transceiver/receiver?

Many today amateur transceivers provide a packet radio connector where the C.O.R. signal is available. The names for the C.O.R varies by manufacturer and the most common names are SQC P and SQL. Transceivers for commercial use such as Motorola and Vertex also usually provide the C.O.R. on their accessories connector.

How to find C.O.R. signal in old transceivers/receiver?

Every transceiver/receiver has the C.O.R. signal internally and one of its functions, as well as mute the audio when no signal is present, is to show the "BUSY" information in the display. For this reason, the C.O.R. signal is normally present in the connector between the front panel and the radio body. Just check with a multimeter the voltages in every pin while openning and closing the squelch knob. If there is a abrupt voltage change from some volts to near zero volt, you found C.O.R. signal.

Which transceivers are compatible with the Elektra 2000 controller?

Any HF/VHF/UHF transceiver operating in FM or DV (D-Star) should work.

Can I use a HT as the repeater transmitter or receiver?

Yes, but is not recommended. Portable radios, usually due to their miniaturization and wide band reception, do not have effective filters, and their reception usually suffers interference with ease. Because the repeater transmitter will be very close, there are great chances it´s transmission interfere with the reception. And as a transmitter, is also deficient in filtering.

Why weak signals fail to keep the repeater on the air?

This type of problem is not related to the controller itself, but with antennas and duplexer, if one is being used. The weak signal reaches the receiver, then the transmitter goes into the air and interferes with the reception and the weak signal is lost, the repeater beeps and there are the tail. But the weak signal is still present at the input triggers the repeater again, initiating a sequence of nagging beeps and falls of the tail. We call this phenomenon desense. If using two antennas, the vertical separation between them shall be larger, while the receiving antenna must always be over the reception antenna. Lowering the transmission power can help. If using duplexer check if the tunning is ok.

Why sporadic 2s cuts occur in the audio of the repeater?

This issue is more common with people with high timbre of voice. The controller has a feature called "Mute DTMF" which cuts the sound of the repeater to receive DTMF commands so those are not retransmitted. What happens is that DTMF tones are in the voice frequency range, and if any voice coincides with a DTMF tone, the audio is cut by up to 2s. One reason may be excessive audio input, in this case try lowering the audio level of the at VR1. If the problem persists, replace the resistor R28 to 680K or higher value such as 750K, 820K or even 1M. A temporary solution would be to disable the function "Mute DTMF", but the downside is that all commands are retransmitted by repeater.

I forgot the password, how to retrieve it?

Performe a Master Reset procedure detailed at the end of the instruction manual. This will cause the controller to go back to original factory settings and the default password is restored. The Master Reset can be executed locally in the board or over the air with the Master Reset Code.


MCR500 - MÓDULO DE CONTROLE REMOTO


Which cell phone is compatible?

Any handset with a headphone output jack and auto answering feature.

How active the auto service on my cell phone?

Normally this option is in the settings in the accessories menu. Just activate it. Note that in some mobile brands such as Nokia this option is only available when a headset is connected and the headphone icon is displayed.

How to connect a cellular phone to the module?

MCR500 just need the audio signal to decode the DTMF tones, the microphone signal to send confirmations and ground. These signals can be obtained via the headphone jack of the cellular phone. You can use the own plug and cable that normally accompanies your device. 

Every cell phone has a feature called auto attendant. This function must be activated so that it meets when you get a call. Note that some devices, like the Nokia brand, allow the activation of ATM function if the headset is connected.

What is an open collector output?

It is an output which when switched off has no signal present (high impedance). When switched on, presents a voltage close to zero volts as if it is grounded. This type of output is common in digital circuits to drive external devices like relays or LEDs. In case of using a relay, one side of the relay coil is connected to it and the other side of the coil to 12 volts DC.

How much credit I have to keep in a prepaid cellular phone?

In fact the cellular phone does not need the credits because it is you who will place the call. It only needs to be active and able to receive incomming calls. So make sure to have enough credits to not lose the activation of your cellular phone line.

What is the difference between versions A, B, C and D?

The software versions A and B have been developed exclusively for use as a car blocker. The only difference between version A and B is, in case of using it without the cellular phone battery, that the latter uses the output accessory 1 to turn the cellular phone on in case it does not come back on when the power is restored. Version C and D are for general use. In version C all outputs are available for commands ON, OFF, pulses and query status. The version D is similar to C, but two of its five outputs provide momentary contact and the pulse duration is not fixed but variable as long as the push button is held down.

 

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