set of Bitx40 questions

Discussion in 'Homebrew and Kit Projects' started by N4AAB, Jul 16, 2017.

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  1. N4AAB

    N4AAB Ham Member QRZ Page

    At the last club meeting I went to a new ham had a Bitx 40m SSB kit and said he was in over his head and asked that someone else complete it. I volunteered.

    I don't have a parts list. Their discussion group said to follow a particular web page for assembly instructions.

    This is the suggested assembly page.

    I have a small plastic box of parts, the Radiuno, plastic case unassembled, wires. Some of the parts are apparently extras...

    So, where do I find a parts list ?

    Is there anything else I might be missing ?
  2. W9GB

    W9GB Ham Member QRZ Page

    Jim -

    There are MULTIPLE versions of the BitX QRP transceivers.

    When Ashhar Farhan, VU2ESE first published this transceiver in 2003,
    it had some issues (stability and spectral to meet FCC standards.)
    These were addressed in other kits or PC boards based on his work.

    First determine where he purchased (whose version).

    HF Signals (Ashhar's web site)
    The Radiuno is the newest version offered by Ashhar.

    Pacific Antenna (formerly Hendricks Kit/NorCal QRP version)
    A decade ago, Dan Tayloe, Jim Kortge and Arv Evans designed a PCB version of BitX that was stable and would meet United States F.C.C. Specifications
    Last edited: Jul 16, 2017
  3. VK3YE

    VK3YE Ham Member QRZ Page

  4. N4AAB

    N4AAB Ham Member QRZ Page

    Yes, I've been there. They just say look at the web page I linked to... but that is not a parts list. So I came here.

    I have the revision 3, he said he bought it from India.
  5. KB1YFD

    KB1YFD Ham Member QRZ Page

    If you have a schematic, then you could follow the traces on the PCB and figure it out one part at a time.

    I just bought one last month from It is a surface mount version fully populated. 10 minutes after putting it on the workbench I had it up and running with clip leads and made a nice contact to the UK.

    I have since made some mods to it and mounted it in a box. I'll publish my mods soon.

    Best, John KB1YFD
  6. N4AAB

    N4AAB Ham Member QRZ Page

    Yup, it was populated when he handed it to me. But I have spare parts and no idea if I install them or not. The schematic is very small. I do have an 8 power crafting maginfier that would help, it also helps for working on arduino stuff, but a parts list would be great.


    When I next get the chance, I can look the schematic and the Raduino over.
  7. KB3UWC

    KB3UWC Subscriber QRZ Page

  8. KG5QBI

    KG5QBI Subscriber QRZ Page

    There are spare parts supplied in case you want to convert from the radioduino external VFO back to the on board, unstable analog VFO. Presuming the purchaser did not do any mods, and is not asking for any mods, you should not need to put an iron to the board. All the work is in completing the connections between the connector pigtails and the jacks, pots, etc.
  9. N4AAB

    N4AAB Ham Member QRZ Page

    I have a case he either bought or made.

    Okay, I have a number of small cables in the box, and a small box of spare parts. I was told on that the capacitor is for going back to the analog VFO. So I can leave that off.

    It doesn't look like he made any mods. I can drill holes for the tunning and speaker potentiometer and mount them. I don't know if this radio is mine or if I have been asked to just finish it up.

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