Bedini RPX Sideband Generator

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Thread: Bedini RPX Sideband Generators

  1. #101
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    Barrie,
    I just went on chat with DigiKey and they said you can go on their website and chat the same as I did. Qualifying orders over $50 are free shipping to Australia. They ship to Australia every day and they claim 1 to 3 business days shipping. They have no knowledge of Australia's custom charges.
    I've bought from them off and on over many years and find them pleasant to deal with. I have also used Newark and Mouser, the two other giant electronic suppliers.
    Best of luck.

  2. #102
    Senior Member Tom C's Avatar
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    Erwei,

    you have stolen from John, stolen from teslagenx, and now you think you can sell product here? you are banned


    Tom C


    experimental Kits, chargers and solar trackers

  3. #103
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    Thanks Tom C. I reckon you & Richard have helped enough for me to give this one a go. Like Richard, all I need now is a Spectrum Analyser, which I think I can get cheap outta China on my next trip there (just $400 return with a direct flight now - can you believe it?). One more point to clear up, if you don't mind looking into....

    I've found a quote from JB on the matter, "The output is coupled to a de-tuned pi-filter using an inductor of 22uH. The two tuning capacitors allow for slight adjustment IF NEEDED on the electrodes."

    I reckon that the way forward from here is to review all my Electronic Engineering notes on 'π' (pi) filters, find out what gives the best results & just experiment within the guidelines given, or like you said, just do the maths & plonk in some fixed values for caps instead of trimmers. Would take quite some time, but I'll keep you all posted.

  4. #104
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    Thanks for all your help, Richard. I'm planning on moving to California one day in the future! I bought the last Velleman Function Generator at Jaycar for a really great price & like you, just need to look at a proper spectrum analyser, which I really should have anyway. I have an old valve type from the 1960's, but it's not going & I have no chance of getting the bits for it.

    I see what you mean regarding being spoilt for choice on inductors. I'll have to see if I can narrow the list down to what works best on 'pi filters', then let you know which types I'm buying. Locally, I can see we have, just in the wire-wound SMD range alone, several different core materials ranging from the usual ferrite (in four different classes!) to Manganese-Zinc to some you-beaut superflux stuff outta Europe, composite iron powder, metal composite, magnetic metal, carbonyl powder, a manganese-zinc-ferrite compound, pure iron(!), a mix of two different classes of ferrite & something they call "metal" which they're not ever going to tell you exactly what's in there! Then there's the option of shielding, & I'm assuming that'd be more ideal(?). I tend to favour as lower DC resistance as possible, as it makes me believe that it's closer to a 'pure' or ideal inductor.

    I reckon there's a fair bit of room for play on the inductor value, as JB explains that it's really just the ratio that's important, so as to get the most out of it, but that other one needs to be fixed or you won't get the right side-bands. Once I get the Spectrum Analyser, I'll just build 100 different versions & see what works best... after all, Edison failed 10000 times just trying to make a light bulb!

  5. #105
    This is a very interesting thread and I saw a few reports from persons that shared their experience with this device. I would very much be interested in reading more about what settings people used and what kind of results they had. I am not sure whether this is the best place to ask or whether there is any other forum out there (here) where experimental results are being discussed?

  6. #106
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    Barrie, have you considered just buying an RPX and opening it up to get some idea of what the inductor looks like? I think that would be cheaper and easier than "building a hundred" versions.
    I will not volunteer to open mine and post my observations without permission from Tom C. And I haven't done this for myself because I already bought two and have a number of unrelated projects going on so no time at the present to build more. However, I did get 10 preprogramed crystals from DigiKey. I'm also hoping someone may come up with a tiny homemade specific purpose sweep generator (no display) that will fit inside the RPX box or everything inside a larger box with that nice TalentCell. It should also include an adjustable on-off timer for example 7 minutes on, 20 minutes off with a total of three such cycles then off until the operator starts it again, not a terribly difficult circuit, just need to fit it in the schedule. Life gets in the way.

  7. #107
    Senior Member Tom C's Avatar
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    Richard,

    The RPX
    units are potted, it would take a heck of a lot of work to get the potting off, and you would probably destroy the components.

    Tom C


    experimental Kits, chargers and solar trackers

  8. #108
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    OK, thanks Tom. I hadn't attempted to look inside yet.
    What is your support policy for those interested in building their own with regard to selecting the correct components such as the inductors?

  9. #109
    Networking Architect Aaron Murakami's Avatar
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    Quote Originally Posted by Richard View Post
    OK, thanks Tom. I hadn't attempted to look inside yet.
    What is your support policy for those interested in building their own with regard to selecting the correct components such as the inductors?
    Get the book and video set where John Bedini gives you schematics for one. http://bedinirpxbook.com
    Aaron Murakami





    You never change things by fighting the existing reality. To change something, build a new model that makes the existing model obsolete. ― Richard Buckminster Fuller

  10. #110
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    Thanks, Aaron, I have the book and disk. But he doesn't specify details about the inductors like "ohms" and core type. Looking through DigiKey there is a great variety of inductors of that specific Henry rating which includes tiny to huge and under a dollar to $28. All the rest of the components seem well defined. I wouldn't mind paying $28 for some of the inductors if necessary but they wouldn't fit in the case (of the RPX's that I bought) so I am guessing it should be something smaller.

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