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ISBN-10: 1872309909

ISBN-13: 9781872309903

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Example text

Fig 19: Conversion step 7, extend the transmit filter elements. • • •! • 53 Microwave Projects Step 8. Add the tuning stubs to the x5 Multiplier stage. This stage is located directly to the left of the La filter which is shown in Fig17. The gate of the x5 Multiplier stage requires addition of two stripline stubs, as shown in Fig 20. Fig 20: Conversion step 8, add the tuninq stubs to the x5 Multiplier stage. Step 9. Modify the 2nd LO amplifier board Modify the 2nd La amplifier board, mount onto transverter and connect 1,136MHz La input throug h 1pF coupling capacitor as shown in Figs 21 - 23.

J mI al cCl'JP Ell en C'l-B a: c solder side with all smd parts. This design reduces interference between rf parts and micro-controller without great screening or filteri ng. The bottom side is shown in Fig 25. Another design criteria was to use a minimum of smd parts which are not currently accepted by radio amateurs. After component installation, no tuning is required for stable and controlled operation , this represent a big satisfaction for all! g. Mitsubishi model . M67715) to reach 2W output.

If available, use a spectrum analyser to check (sniff using a short probe connected by coax) the synthesiser output frequency and spectrum. The synthesiser should be operating on 2,272MHz and no 2MHz or other spurs should be visible. Carefully probe the drain of each FET in the La multiplier, La amplifier, and LNA to verify biases are approximately +2 to +3VDC. A drain voltage of near OV or 5V probably indicates a problem with that stage. Place the transverter in transmit mode and verify the biasing on the transmit La amplifier and transmit output amp stages.

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Microwave Projects


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