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Grant Hodgson G8UBN

A new AO-40 K-band Downconverter. Grant Hodgson G8UBN. A new AO-40 K-band Downconverter. Grant Hodgson G8UBN. Topics presented :- Conventional Downconverter Design New dual-injection design with new components New Synthesised Local Oscillator. A new AO-40 K-band Downconverter.

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Grant Hodgson G8UBN

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  1. A new AO-40 K-band Downconverter Grant Hodgson G8UBN

  2. A new AO-40 K-band Downconverter Grant Hodgson G8UBN • Topics presented :- • Conventional Downconverter Design • New dual-injection design with new components • New Synthesised Local Oscillator

  3. A new AO-40 K-band Downconverter

  4. A new AO-40 K-band Downconverter Conventional 24GHz Downconverter • Proven design • Image frequency is very close to wanted frequency - • Therefore a narrow waveguide filter must be used • Which requires adjusting and aligning • Local Oscillator multiplier (x4 or x5) requires aligning • Conventional Local Oscillator also requires aligning

  5. A new AO-40 K-band Downconverter Conventional 24GHz Downconverter Photo courtesy of Mike, N1JEZ

  6. A new AO-40 K-band Downconverter 24GHz Waveguide Filter Photo courtesy of Howard, G6LVB

  7. A new AO-40 K-band Downconverter New 24GHz Downconverter - design objectives • Be self-contained - no external LO etc. • No-tune design • Low frequency drift with temperature • Modular design - interchange various system components • (LO, LNA etc) • Allow reception of terrestrial Dx at 24192MHz as well as • AO-40 K-band downlink (24048MHz) • Use new components that will not become obsolete in • less than 5 -10 years • Encourage experimentation at microwave frequencies!

  8. A new AO-40 K-band Downconverter

  9. A new AO-40 K-band Downconverter

  10. A new AO-40 K-band Downconverter Harmonic suppression of HMC204 doubler

  11. A new AO-40 K-band Downconverter Brief overview - image response of mixers

  12. A new AO-40 K-band Downconverter

  13. A new AO-40 K-band Downconverter

  14. A new AO-40 K-band Downconverter PCB • Difficult choice at 24GHz • Various options, but probably :- • Separate (external) LNA • Duroid, Taconic or Similar • Main PCB on std. FR4 fibreglass

  15. A new AO-40 K-band Downconverter Summary • Most of the design objectives have been met • Next step is circuit design and prototyping • Waveguide image filter has been eliminated • True no-tune design • Operation on K-band should become easier, • whilst still leaving lots of room for investigation • and experimentation

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