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Grant Hodgson G8UBN

New Microwave Transverter Concepts. Grant Hodgson G8UBN. New Microwave Transverter Concepts. Grant Hodgson G8UBN. Topics presented :- Current Transverter Design New conecpts with new components Local Oscillator options. New Microwave Transverter Concepts.

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Grant Hodgson G8UBN

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  1. New Microwave Transverter Concepts Grant Hodgson G8UBN

  2. New Microwave Transverter Concepts Grant Hodgson G8UBN • Topics presented :- • Current Transverter Design • New conecpts with new components • Local Oscillator options

  3. New Microwave Transverter Concepts Conventional 10GHz transverter 5W @ 10GHz based on DB6NT modules G3PHO

  4. New Microwave Transverter Concepts Conventional transmit converter

  5. New Microwave Transverter Concepts The future of Transverters? • Highly Integrated Cicuit • All functions ‘on-chip’ • Includes :- • Mixer • Synthesiser • (PLL, VCO) • Driver/PA • LNA • T/R switching

  6. New Microwave Transverter Concepts The future of Transverters? • UNLIKELY - • Amateur market is too small • Difficult to customise

  7. New Microwave Transverter Concepts 24GHz Waveguide Filter Photo courtesy of Howard, G6LVB

  8. New Microwave Transverter Concepts

  9. New Microwave Transverter Concepts Performance of HMC264 sub-harmonic mixer

  10. New Microwave Transverter Concepts No-tune 24GHz transverter - Advantages • Elimination of tunable filters - i.e. • No-tune design • Lower cost • Allows for operation at 24048 or 24192MHz • Allows operation at 28GHz!

  11. New Microwave Transverter Concepts New transmit converter 5.7GHz or 10GHz

  12. New Microwave Transverter Concepts 90 degree phase shift network

  13. New Microwave Transverter Concepts HMC520 transmit converter - measured performance LO rejection 39dB Image rejection 42dB Other products >37dB Achieved with no filtering!

  14. New Microwave Transverter Concepts HMC443 Active Quadrupler - measured performance Fundamental -45dB 2nd Harmonic -25dB 3rd Harmonic -47dB 5th Harmonic -46dB 6th Harmonic -35dB Achieved with no filtering!

  15. New Microwave Transverter Concepts New transmit converter - Advantages • Elimination of tunable filters - i.e. • No-tune design • Lower cost • Allows for operation in other parts of the bands • eg. 10450MHz • Or even non-amateur bands such as 8.42GHz (Deep Space) • Allows flexibility in choice of type of LO (PLL, Xtal, DDS etc) • Choice of IF frequencies - 28, 144, 432MHz • High output power - 2W@10GHz • Possibility of Dual-band transverter

  16. New Microwave Transverter Concepts New transmit converter - Drawbacks • Output is not quite as ‘clean’ as fully filtered design • LO drive level is very high (+13dBm @ 10.224GHz) • DC current consumption may be higher • Close-tolerance capacitors required for phase shift network

  17. New Microwave Transverter Concepts Options for Local Oscillators • Crystal Oscillator - can be ovenised or Reflocked • Good (best?) phase noise • DDS - any frequency you like • Can use OCXO or other hi-stab reference, inc. GPS • Phase Locked Loop - operating at 2.4GHz, • good phase noise IS possible with careful design • Can use OCXO or other hi-stab reference, inc. GPS • Other novel applications - eg. • 120GHz Tx/Rx with single 2.4GHz LO

  18. New Microwave Transverter Concepts Other no-tune options • Active bias circuits allow -ve voltages to be set automatically

  19. New Microwave Transverter Concepts Summary • New components, particularly MMICs, allow new concepts • to be implemented • No-tune designs are possible

  20. New Microwave Transverter Concepts No-tune transverters are possible - will the next generation see the end of the trim tool?

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