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State-of-the-Art CW Technology: A Coherent Review

A brief review of advanced CW technology by George Heron, N2APB, focusing on synchronized Tx/Rx of 12wpm code using precise timing BPSK. Software algorithms and computer controls enhance performance, with improved noise immunity and Rx probability. Learn how to upgrade with the Sigma-Delta ADC board by VE2IQ for superior results. Find out about BPSK success stories where Peter Lumb G3IRM and Bill de Carle VE2IQ connect daily on 14.081 MHz. Explore simple to advanced station setups, featuring A/D converters, DSP, VFO, and more.

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State-of-the-Art CW Technology: A Coherent Review

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  1. Coherent CW A Brief Review of the State-of-the-Art George Heron, N2APB

  2. Technical Status • Tx & Rx of precisely timed (12wpm) code • Software algorithms synchronize • Computer controls the Tx in 1 Hz steps 0.1s 0.1s Precise 12wpm timing

  3. BPSK • CCW is dead … replaced by BPSK • BPSK uses Tx/Rx of 800 Hz tones • Better noise immunity • Improved probability of Rx

  4. How? • Sigma-Delta ADC board, by VE2IQ Computer serial port Rx audio 8-bit A/D

  5. Where? • Peter Lumb G3IRM & Bill de Carle VE2IQ have daily BPSK sked on 14.081 MHz at 1600z. Settings: MS25, ET1 enabled. • Active group on BPSK and LOWfer reflectors. (Subscribe to BPSK: messge to majordomo@qth.net with “subscribe bpsk” in body.

  6. A Simple CCW Station Rx A/D RS-232 PC XCVR Tx up/down control and Keyed input

  7. Simple CCW Station

  8. VE2IQ SD and SDAC boards

  9. An Advanced CCW Station A/D Converter PC Tx up/down control Tx keying Tx I DSP Audio Processor DDS VFO Phase Splitter R2 Rx Audio Out Q

  10. A More Advanced CCW Station A/D Converter PC Tx up/down control Tx keying Tx I DSP Audio Processor DDS VFO Phase Splitter R2 Rx Audio Out Q Key / Paddle

  11. R2 T2 xcvr + DDS VFO + DSP

  12. R2 Receiver

  13. T2 Transmitter and Amp

  14. DSP Board

  15. Q & A

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