7.5. Radio Settings
Below is the description of functions and their meanings:
• Callsign – The sign of our station with SSID extension. The default SSID is 0,
• TX delay (ms) – The delay time TX / RX in milliseconds for sending packages. It is
a kind of preamble that is sent before the data frame in order to synchronize the
receivers which listen on an APRS network. The recommended value is not less
than 250ms,
• Quiet time (ms) – Minimum time off after the radio channel is busy. After this time
data frame is sent from the transmit buffer,
• PTT – PTT output selection, we can choose between two options:
• SEPARATE OUTPUT – PTT output pin is short-circuit to ground while
broadcasting,
• 2K2 RESISTOR – AUDIO OUT is short-circiut to ground with 2k2 Ohm resistor,
function used in some handheld radios for broadcasting,
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