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Grundig YB400 service manual needed

Discussion in 'Electronic Repair' started by msg, Jun 4, 2007.

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  1. msg

    msg Guest

    Greetings:

    I have built a software controlled receiver based on
    the RF section from a Grundig YB400 (YB 400, Yacht Boy
    400) radio; I have the schematics from the Grundig
    service manual (kindly posted to a web forum) but
    I need to locate the remainder of the service manual
    for component call-outs and alignment data among
    other things. I have generated some call-out graphics
    from tedious tracing under a magnifier but many
    components are hidden under shields which I won't
    remove until necessary and tracing the remainder of
    the rig would take quite a stretch of time.

    Doe anyone have this book in electronic or hardcopy
    form?

    Much thanks in advance,

    Michael
     
  2. Arfa Daily

    Arfa Daily Guest

    Software Controlled Radio or Software *Defined* Radio ? If the latter, I
    would have thought that a Yacht Boy would not have had the front-end
    performance to sufficiently showcase an SDR module. Just interested. Sorry,
    don't have the service info for that model.

    Arfa
     
  3. It's an old style radio.

    ANd the guy hasn't designed anything, he's stealing the design, and
    hasn't even gotten that far, or else he'd not be looking for the schematic.

    When I got an older Grundig shortwave receiver last fall at a community
    sale, it wasn't long before I had the cover off, and at least had a general
    layout of the circuit, just by looking at it. If someone is going to
    steal a design, at least they should do thw work.

    Michael
     
  4. msg

    msg Guest

    <snip>

    Thanks for your reply; no it is not SDR. The RF section from the
    radio was a convenient starting point for a personal project.

    Regards,

    Michael
     
  5. msg

    msg Guest

    <snip>

    Please refrain from unwarranted vitriol; in my post I stated that I had
    the schematics, I just hoped to find the rest of the book. This is a
    personal project and I should have written 'used the RF section from
    a YB 400' rather than 'based on the RF section from a YB 400'. Aren't
    there any homebrewers here?

    Regards,

    Michael
     
  6. msg

    msg Guest

    I must mention that I tried to purchase a manual
    from 'Eton', the current owner of the Grundig radio
    line and I was told that they don't have this manual,
    that it was unavailable to them. Ergo, my usenet
    request. The service manual was published in Germany
    and was not restricted.

    Regards,

    Michael
     



  7. --
    Service to my country? Been there, Done that, and I've got my DD214 to
    prove it.
    Member of DAV #85.

    Michael A. Terrell
    Central Florida
     
  8. msg

    msg Guest

    Indeed; if you check the archives you'll find my post
    to that NG with this request some weeks ago. It seems
    to me more likely that folks involved in depot repair
    and service will potentially have the manual and are
    more likely to read this NG...

    Regards,

    Michael
     

  9. Have you contacted the factory authorized service center(s)?


    --
    Service to my country? Been there, Done that, and I've got my DD214 to
    prove it.
    Member of DAV #85.

    Michael A. Terrell
    Central Florida
     
  10. Arfa Daily

    Arfa Daily Guest

    Yes, I am both licensed, and an old-school home brewer, which is why I was
    interested in exactly what you were talking about, and what you were trying
    to do with it. This month's RadCom has an article which actually deals with
    the principle of what it would seem that you are trying to do, using an old
    FT290 as a VHF front end for an SDR module - that's assuming that we are
    talking SDR here, a point which you haven't cleared up yet.

    Arfa
     
  11. Arfa Daily

    Arfa Daily Guest

    OK. That's that cleared up then. So what exactly are you controlling, and
    with what software ?

    Arfa
     
  12. msg

    msg Guest

    Thanks for asking.

    I designed a digital section to control the pll 1st LO, filter selection,
    BFO, and misc. power and control lines with provision for additional signals
    as the design progresses. I modified the RF section to accommodate my digital
    design, removed superfluous components no longer used and added modules at
    appropriate places where real estate permitted, changed the antenna input
    circuits and provided a 50 ohm bnc input. The RF section and digital
    section are separately encased in faraday cage shields, all dc lines are
    bypassed and filtered, serial i/o is ferrite choked and ground straps
    are liberally used. I have work to do yet to quench processor clock
    harmonics and mcu conducted RFI on a small number of i/o lines between
    the modules (I've reduced this RFI by about 10db since I started...). I
    may need to do some software-based autonotching to move the birdies out
    of the passband dynamically.

    I download operating code over an rs232 port which also serves as the
    control interface and I'm writing a comprehensive VT100-graphics based
    control program for a systems-agnostic way to operate the receiver.

    I will be posting a link to the website documenting this project soon
    (in rec.radio.amateur.homebrew) and will provide online access to the
    receiver with realtime RTP audio streaming.

    Regards,

    Michael
     
  13. DaveM

    DaveM Guest

    You might try http://home.arcor.de/walter.groer/schema.htm. They seem to have a
    pretty good stock of manuals and schematics for European made radios, including
    Grundig. The Grundig page lists the YB-400, but don't know if it's the complete
    manual or just the schematic. Six pages, if that helps.

    --
    Dave M
    MasonDG44 at comcast dot net (Just substitute the appropriate characters in the
    address)

    Life is like a roll of toilet paper; the closer to the end, the faster it goes.
     
  14. msg

    msg Guest

    Thanks for the lead; I know that the service manual has at least
    20 pages and the schematics as foldouts occupy 6 A4 pages so he
    must have only schematics. Also, he lists the year of introduction
    of the YB400 as '81 which is a bit odd since many ICs it uses weren't
    produced until the late '80s :) However, I will email him and inquire
    further.

    Regards,

    Michael
     
  15. Arfa Daily

    Arfa Daily Guest

    Interesting project. I'd like to see the website when it's available.

    Arfa
     
  16. msg

    msg Guest

    Hi, I sent you an email with the URL to my preliminary site for
    accessing the receiver. If you did not get it, please contact me at
    msg _at_ cybertheque _dot_ org.

    Thanks,

    Michael
     
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