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    THE FUN CUBE DOGLE HF CONVERTER

    By. Tony CT1FFU ano Diogo CT2IRW

    If you are a FCD owner I am sure you are a very satisfied with the quality and performancereceiving satellites and all sorts of communications in VHF and UHF.However, the FCD only starts receiving properly from 64Mhz up, and misses all the good fun that isreceiving HF and 6m on a SDR.

    That is why we decided to make a simple HF converter to the FCD, and get access on all the bands,extending the RX now from DC to 1700Mhz.

    The HF converter is very simple, as you can see in diagram, any person with some solderingexperience in kit build, will have no problems to get it work properly.

    Circuit description:

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    The Filter on the Input is a Low Pass Filter.Designed the aloud only frequencies from DC to 52Mhz travel into the mixer.

    The Local Oscillator is a crystal clock and runs on 106.250Mhz. (this is our IF)

    The mixer ADE-1 minicircuits, making the conversion of signals.

    In the output we have another filter, Hi Pass Filter, preventing image frequencies and aloud onlythe signals up 100Mhz be received by the FCD

    VCC, 5V are supplied from a USB connector or from Phantom-power of FCD.

    Aspect of the Converter ready build.

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    You have a paper like this, check that all the parts are there.Carefully remove the tape, you dont want to lose any small SMD.

    Assembling it's be easy, start with caps and resistors first, then go to coils, and finally the mixer andclock.You might need to use solder flux so it will help the SMDs to get well soldered to the PCB.

    The Trap L5/C10 and C15 are optional, and not supplied on this version.On Mixer and Clock look carefully on DOT mark, the PCB and parts face together, as show on

    picture.

    Testing:

    Wen plug the converter to a USB, check with a multimeter for 5V on Clock Oscillator VCC pin.And on both diodes.

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    If you have a Frequency counter or Oscilloscope you can now check for 106.250 Mhz carrier onthe output of clock.

    Test point.

    Read 106.250Mhz on R1.

    You will use this frequency on LO, the more accurate reading, the better Nice sin wave from clock.( in fact, the LO is not sin wave, it is more like square wave, but on a 100Mhz oscilloscope this ishow is looks.You will need a higher frequency oscilloscope to see the real wave shape)However, if you see a wave like this, it means you have LO running!

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    If you dont have no frequencies meter or oscilloscope, you can listen to the LO carrier on a FMreceiver or a Walkie-talkie tuned near the frequency 106.250 Mhz

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    Plot for the input Low-pass-filter

    Plot for the high-pass-filter

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    About SDR-Radio:As Version 3.0 have very high gain on conversion, you will improve the reception

    by reducing the LNA gain on FCD.

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