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Supplier for ceramic resonators in the UK?

Discussion in 'Electronic Design' started by Paul Burridge, Feb 5, 2004.

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  1. Hi,

    Does anyone know a company that carries a good range of these and/or
    can maybe make up 'specials' if required? I'm ideally looking for an
    8.2Mhz resonator but so far have only seen standard values of 2, 4, 8,
    10Mhz and so forth..
    Thanks,

    p.
     
  2. Leon Heller

    Leon Heller Guest

    What's wrong with a crystal? Specials are easy to obtain, unlike ceramic
    resonators.

    Leon
     
  3. Tim Wescott

    Tim Wescott Guest

    He wants to pull the frequency +/- 35kHz off center, and he's wisely noticed
    that resonators can be rubbered much more easily than crystals.
     
  4. Leon Heller

    Leon Heller Guest


    Putting two crystals in parallel makes them a lot more 'pullable' and
    has been used by some radio amateurs. Not sure if Paul will get 35 kHz,
    though.

    Leon
     
  5. In that case, what's wrong with an LC tank?

    Best regards,
    Spehro Pefhany
     
  6. 35 kHz + - at 8 MHz would allow for a LC with varicap.
     
  7. Are you serious? They drift like crazy if not built very carefully
    indeed and even then the stability wouldn't be sufficient in this
    case.
     
  8. It does increase 'pullability' but not by much. I read one instance of
    200Khz with care for one resonator and only 220 easily with two in ||
    so it's not very encouraging - although I do have more than one. Hey,
    maybe I should parallel-up a dozen or so. :)
     
  9. So you multiply up to get the needed frequency range, and then
    mix down to the actual needed output frequency.

    Michael
     
  10. <rant>
    Ah come on, never designed a good communications receiver in
    the past?
    A good VCO? In your theory my good old (tube) Trio would not work...
    it did drift a bit on 20 MHz so the SSB pitch got high (say 3 kHz drift
    after warm up, but hey...)
    Before <<<<<< PLL any old radio with shortwave managed to stay
    on station in a wide temp range, as far back as I remember in 1958...
    Transistors and zero tc caps improved a lot.
    It is difficult to make one with transistors these days that drifts.
    Unless you have no clue, read up some old RSGB handbook, back to
    the first issue
    </rant>
    Jan
     
  11. Tim Shoppa

    Tim Shoppa Guest

    If you can summarize what you really want in a single post, instead
    of spreading your requirements out over a large set of threads,
    you will almost certainly get more usable responses.

    An LC tank VFO as an input into a mixer/multiplier chain is certainly
    capable of your desired stability, although perhaps not meeting some other
    requirement.

    Tim.
     
  12. Genome

    Genome Guest

    Ceramic resonator.

    Tolerance +/-0.5%
    Tempco +/-0.2% over 100C (-20 to +80)

    40-40.5MHz in 10KHz steps.

    Do sums........

    Ah yes, head still up bum.


    DNA
     
  13. Yes! I did actually suss this fact out by myself at about 3am this
    morning in a moment of personal revelation. Isn't it amazing what
    insomnia can do? :)
     
  14. Erm, no. Oh - you're having a laugh at my expense, eh? Well I suppose
    I'm pretty well used to that by now. :-(
     
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