1. DIGITAL & DATA MODES

2. Digital / Data Modes Fldigi FSK WinPack PSK USB TNC/Sound Card
Audio IN/OUT
USB
TNC/Sound Card

3. Digital / Data Modes 219 to 220 MHz, also others
Many different “flavors”
“parity bit” extra bit detects errors
BER = Bit Error Rate
GPS can provide APRS

4. PSK31 Low Data Rate (Keyboard) continuous whistle with a slight warble
Sound files from

5. MFSK Shifts Audio Frequency between a number of different tones
Low data rate 64 bps
Sounds like a crazy bird
Sound files from

6. Packet “High” Data Rate Checksum Header (Destination Call Sign)
Automatic Repeat if error detected
How it sounds:
Sound files from