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

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Presentation on theme: "Grant Hodgson G8UBN A new AO-40 K-band Downconverter."— Presentation transcript:

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

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

3 A new AO-40 K-band Downconverter

4 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 Conventional 24GHz Downconverter

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 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 years Encourage experimentation at microwave frequencies! New 24GHz Downconverter - design objectives

8 A new AO-40 K-band Downconverter

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10 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

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14 Difficult choice at 24GHz Various options, but probably :- Separate (external) LNA Duroid, Taconic or Similar Main PCB on std. FR4 fibreglass PCB

15 A new AO-40 K-band Downconverter 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 Summary


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