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Digital Modes

Digital Modes. What Are Digital Modes. Conversational (non-voice) Person to person Interactive Non-Voice keyboard to keyboard Not file driven Software driven Computer / Soundcard enabled Low bandwidth (mostly). Digital Modes - Advantages. Low bandwidth Low power requirements

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Digital Modes

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  1. Digital Modes

  2. What Are Digital Modes • Conversational (non-voice) • Person to person • Interactive • Non-Voice keyboard to keyboard • Not file driven • Software driven • Computer / Soundcard enabled • Low bandwidth (mostly)

  3. Digital Modes - Advantages • Low bandwidth • Low power requirements • Convenient software / hardware interface

  4. Digital Modes - Disadvantages • Computer required • Some radios can work PSK directly • Sometimes hard to set up • Winlink 2000 using software • Sometimes difficult to tune • Confusion factor

  5. PSK MCW RTTY JT65 Hellschreiber MT63 MFSK16 Amtor Pactor G-TOR Clover Packet WSJT Other Modes Popular Digital Modes

  6. Common Frequencies

  7. What Is Needed • Radio • Computer • Software • Interface

  8. Radio • SSB capable (USB is std sideband) • Keying circuit - solidstate compatible (nice) • ALC Metering • Adjustable power

  9. Yaesu FT 857/897 series FT-817 Kenwood TS-2000 TS-480 Series Ten-Tec Icom IC-703 IC-706 IC-7000 IC-718 Elecraft K2 K3 Popular Radios

  10. Computer & Related • 1GHz Pentium 4M or better (for Windows OS) • Soundcard • Serial interfaces or USB serial converters • Operating Systems • Linux (Many Varieties) • Macintosh • MS Windows • XP (Home or Pro) • Vista (Home or Business) • 7 • DOS↓

  11. Radio Operational Niceties • Data Port • Allows voice and data operation without unplugging a bunch of stuff • Control Port • Allows control software to change operating modes, frequency etc • Works with logging program for hands free logging

  12. DigiPan MixW ver. 2 MultiPSK TrueTTY AirLink HRD/DM 780 DxPSK Easyterm EZT3271 Fldigi Intercom - DOS KC9L PSK LinPsk - Psk31 program - Linux MPSKWIQ PacTerm for Windows - Kantronics™ TNCs PropNerPSK PSK31 by G3PLX PSK31 Deluxe PSKGNR Front end QuikPSK RoMac RX-PSK31SMARTPSK TWPSK - Linux W1SQLPSK WinPSK WinPSKse WinWarbler WO-PSK YG-PSK Zakanaka Some Popular Programs

  13. Sound Card Interfaces

  14. Connections (Data Port)

  15. Connections (No Data Port)

  16. Which Interface is Best? What to look for: • Transformer isolation on TX & RX • Keying circuit works with your radio • Boat anchors may require relays • Solidstate radios can us opto-isolators • Adjustable signal levels • Mike switching for radios without a data port

  17. Can I build my own Interface? • Yes • Breadboard • Dead bug • Circuit board

  18. Typical Audio Interface

  19. Typical Keying/PTT Interface

  20. Questions

  21. Demo Ham Radio Delux Demo Mode

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