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Thread: Vintage Crystals

  1. #1
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    Default Vintage Crystals

    So I have a quantity of old crystals, I believe these are Motorola. Anyone have any idea what type of radios these would have gone in?

    I would like to get a low band PT500, PT400, or GE Porta-Mobil working on 43.04 and 43.00.



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    At a guess a Maxar80.

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    Do you know the actual crystal? That information might make it easier to determine what line it went with, at least it might eliminate some.

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    The only markings are:

    R43.00
    HHK6G

    And

    T43.00
    HHK7K
    JAPAN

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    the base freq is what Jimmn is asking for. Many RX are times 3 plus 10.7 and TX times 3 for Lowband.

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    Often the accual freq of the cryatal is stamped on the top of the crystal, sometimes it is printed on the side.

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    Definetely not for a PT or HT.
    Those pins are for a socket.
    The PT and HT series (same boards) used small wires and were soldered in.
    None of those numbers sound like anything Motorola to me.

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    Default Vintage Crystals

    Those crystals don't seem to match up to anything in the manufacturer cross-reference section of the International Crystal catalog:

    http://www.sphere.bc.ca/test/rf-parts/icm-2006.pdf

    Start looking on page 49 of the pdf.

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    I knew it was too good to be true for them to be Motorola.

    Unfortunately they have no marks msg other than what I posted. I have a whole packet of 43.04 T/R crystals that appear the same with similar marks mags, none of them have the IF freq.

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    Those are not Motorola part numbers on them. The bag also says Japan, I believe the Mfr. is HHK, as is stamped on the body - I have heard of them before, and I don't know exactly who that is but I have seen it on all sorts of Japanese radio stuff. The bags have an HP logo could that be a possible hint? I don't think they ever made any radio gear, though. Also, Motorola (I don't think) used socketed crystals in anything, maybe except HT90/440s? Maybe they are for the old Midland slant-face radios, I think they made a VHF low band version of that or maybe some old Johnson gear, who knows...

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    Default Vintage Crystals

    Quote Originally Posted by Alpha View Post
    Also, Motorola (I don't think) used socketed crystals in anything, maybe except HT90/440s?
    Motorola’s T-power radios used “crystal ovens” with socketed crystals. You would buy the crystals from ICM and specify a temperature compensation of 85C.

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    Maybe you can find some information here:

    http://www.af4k.com/mega/xtals.htm

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    if you have a simple oscillator you could use that to determine the base freqs. Other than that I cant see any practical use for the xtals.

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    The shop they came from did Service a lot of RCA, GE, Midland, and Motorola back in the day so that’s a good bet. If I can ever lay hands on the appropriate lunchbox I’ll just order new crystals. Low band PT500’s seem to be unobtainium these days.

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    As an aside, the frequency of those crystals - 43.0 - is/was a low band police frequency.

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    Quote Originally Posted by Number 6 View Post
    As an aside, the frequency of those crystals - 43.0 - is/was a low band police frequency.
    I have a nationwide license on 43.04 and my buddy has a license on 43.00 he lets me use.

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    I posted the xtal formulas on the other board for you.
    Still going to be pretty hard to get xtals for those.
    Have you thot of just buying a P200LB handheld?
    A packset is a lot cooler tho.