• Repeater Foundation
• PI1BER (APRS digi)
• PI1BOZ D-Star
• PI2BOZ 70cm
• PI3BOZ 2m
• PI6BOZ ATV
CTCSS also known as SUBaudioWhat is CTCSS ?
This abbreviation stands for "Continues Tone Controlled Squelch System".
Why do we use this ?
To prevent unwanted transmission of the repeater (for example by stations that use another repeater).
When have we started this?
On 1 januari 2010 has the input of the repeater also been activated by CTCSS.
How does it work?
To open the relaisstation, the user continuously has to transmit the 88.5Hz tone, together with the speech. The tone is made by a special oscillator (the tone ENcoder).
Schematic diagram of a CTCSS encoder :
A home made pcb, drawn by hand :
PCB after the etching :
Drilled pcb :
PCB in test:
At the bottom of the pcb are some SMD components .
Firmware of the CTCSS encoder:
Version 0.1 of the firmware
Version 0.2 of the firmware (bugfix)
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