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QRP Labs Ultimate3S, Manual

The QRP Labs Ultimate3S is a powerful, feature-packed kit for amateur radio enthusiasts. Its user-friendly manual provides step-by-step instructions for assembly and operation. Download your free manual from the QRP Labs website to get started with this cutting-edge device today.

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Rev 1.01

4

Multi-band Ultimate3S with 5W HF PA kit and relay-switched LPF kit

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Summary of Contents for Ultimate3S

Page 1: ...w to interface the PA kit to the QRP Labs Ultimate3S transmitter kit The assembly document for the PA kit is ESSENTIAL reading prior to this application note 2 Block Diagram The basic Ultimate3S trans...

Page 2: ...timate3S stack then you will need to put the 5W HF PA kit at the BACK of the stack due to the 65mm tall heatsink You will also need to purchase a set of four 25mm nylon spacers from the QRP Labs shop...

Page 3: ...the original Ultimate3S PA and the Low Pass Filter on the U3S PCB is to remove capacitor C5 If you don t mind a little aggression you can even just cut it out with wire cutters For routing the RF out...

Page 4: ...Rev 1 01 4 Multi band Ultimate3S with 5W HF PA kit and relay switched LPF kit...

Page 5: ...g rather than a plug socket solution The RF connections between boards can be thin coax but don t worry if none is available and you just need to use a piece of hook up wire The envelope control signa...

Page 6: ...e DAC A safe value would be 115 for a 12V supply or 140 for a 13 8V supply Please refer to the PA Assembly instructions section 5 3 for an explanation of this value and for values that suit other PA s...

Page 7: ...the PA Assembly instructions download at the PA Kit page http qrp labs com pa For any questions regarding the assembly and operation of this kit please join the QRP Labs group see http qrp labs com g...

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