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VK5DGR

7/28/2017

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Episode 156 - David Rowe - VK5DGR

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David Rowe, VK5DGR, has been a guest target since QSO Today episode 16 with Bruce Perens, K6BP because of David’s seminal work with audio codecs for digital audio on HF.  David has a strong background in digital voice, a technology that is now the foundation for all of the telephony and voice over IP that we do.  As an advocate of open source and the consummate teacher, David shares all of his work while educating us with his blog, rowetel.com.  VK5DGR is Eric, 4Z1UG’s  QSO Today.

Show Notes
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How to make an Amazon Shortcut

First License: Novice, Age 13, VK5PDR

Electronics Australia Magazine

Roger Harrison, VK2ZRH, Australian entrepreneur

Adelaide, South Australia

Wireless institute of Australia

First Rig:
Kenwood: TS-120V  
Converted CB Radio on 10 meters

Favorite Mode: digital voice

Elmer:  Bob Barnes VK5NRN

Current Rig:
  • Icom IC-7200
  • Yaesu FT-817
Early computers mentioned:
  • Altair 8800
  • Imsai 8080
David's first computer: Microbee Z-80

​Model 15 teletype to use with the Z80

Education:
University of South Australia, BENG,  PhD
Speech Compression

Craig Newmark’s nerd values - from Craig Newmark’s blog Craig Connects.

David Rowe’s Blog

Asterisk Software PBX

Embedded Asterisk in Blackfin Processor

OSLEC echo canceller

K6BP, Bruce Perens - QSO Today Guest in Episode 15

FreeDV 1600 - digital speech compression for HF

Codec 2 - speech compression software

Rowetel SM1000- embedded implementation of the FreeDV software.

C4FM codec

Village Telco - bring telephony to rural villages

Mesh Potato - Mesh network embedded asterisk telephone terminal

Shuttleworth Foundation

David’s Electric Car Conversion -

Excited by: SDR - software defined radio

Advice to new or returning hams: join a club

LilacSat 2 - Satallite FM to Codec 2 transponder

David’s Test Equipment:
  • Marconi 2031 Signal Generator
  • Tektronix TDS540
  • Rigol DSA815TG spectrum analyzer with tracking generator
  • HackRF One - from Great Scott Gadgets is a Software Defined Radio peripheral capable of transmission or reception of radio signals from 1 MHz to 6 GHz.

AREG Group - Amateur Radio Experimenter’s Group


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Kenwood TS-120V
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SM1000 Rowetel HF Codec
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Village Telco Mesh Potato 2.0
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David's modified electric car
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