ELEKTRA 2000 Hamtronix
5
TURNING YOUR CONTROLLER ON FOR THE FIRST TIME
Place jumper J1 (ON). A melody should be heard if all transmitter connections were made correctly. Key
up on repeater input frequency to check if the received signal is being retransmitted. If the receiver
connections were made correctly, you should be able to hear the courtesy tone after transmitter drops. If
you hear no melody at power up or you can’t access the repeater receiver, remove J1 and check all
connections on the CN1.
AUDIO ADJUSTS
Repeater audio coming from repeater receiver
Repeater audio going to repeater transmitter
Link audio coming from link transceiver
Link audio going to link transceiver
Courtesy tone/CW audio level
All tones generated by microcontroller chip
Note: Ideally the level of a coming signal should be retransmitted with the same level. Ask for someone to transmit a
tone or a DTMF tone (turn off mute function for this approach) at repeater input frequency. Using a radio with
REV/MON/Reverse switch, check the AC voltage at radio speaker or discriminator output. Adjust RX-1 and TX-1 to
obtain the same level.
LEDS
The controller is powered
A signal is present at repeater or link receiver
The repeater or link is transmitting
FAN CONTROL OUTPUT
When the repeater transmits, this output will be on (active low) and will remain on for 2 additional
minutes after the TX drops. Use this output to control a fan relay to cool the repeater’s transmitter. This
is an open collector output and can drive 500mA max. ID messages are not considered for fan control.
AUDIO EQUALIZATION
If you need some audio equalization, experiment with capacitors at C11 for repeater audio and
C12 for link audio. A start point could be 1nF until 10uF.
When getting audio from discriminator’s receiver and sending that audio directly to the
transmitter, equalization maybe unnecessary.
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General