Grant Hodgson G8UBN New Microwave Transverter Concepts.

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Presentation transcript:

Grant Hodgson G8UBN New Microwave Transverter Concepts

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

New Microwave Transverter Concepts Conventional 10GHz transverter 10GHz based on DB6NT modules G3PHO

New Microwave Transverter Concepts Conventional transmit converter

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

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

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

New Microwave Transverter Concepts

Performance of HMC264 sub-harmonic mixer

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

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

New Microwave Transverter Concepts 90 degree phase shift network

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

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!

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 MHz 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 - Possibility of Dual-band transverter

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

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

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

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

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