[time-nuts] "Vanguard Ultra precision Golden Oscillator"

[Bob Camp]

Hi

The technique still works fine. If you have looked at the auction prices on 
the old crystals … good grief …..

If you do drop one into a “modern” circuit, it’s worth noting that the crystal 
in an FT style holder has another capacitor in it when compared to the model of
a modern (plated electrode) crystal. The air gap is the source of the element. Net
result is that (without the toothpaste) they are a bit harder to tune. 

Bob

> On Aug 24, 2015, at 1:49 PM, Don Latham <djl at montana.com> wrote:
> 
> Gee whatever happened to slipping it out of the ol' FT holder and rubbing with
> a little toothpaste?
> <g> Don
> 
> Bob Camp
>> Hi
>>> On Aug 23, 2015, at 10:29 PM, Hal Murray <hmurray at megapathdsl.net> wrote:
>>> 
>>> 
>>> kb8tq at n1k.org said:
>>>> There is not a lot to an un-compensated crystal oscillator. Tuning it on
>>>> frequency is fairly simple. Even for odd  frequencies Mouser will happily
>>>> sell you a crystal for next to nothing. Toss in a handful of parts and you
>>>> have a very respectable oscillator. For a basement project … much better
>>>> than spending $40 on something suspect from who knows who.
>>> 
>>> What's magic about a crystal as compared to an osc?  Is it really easier to
>>> get an odd-ball frequency in a crystal vs an osc?
>> 
>> 
>> When I do a Mouser search for frequencies in the range I mentioned, the number
>> of frequencies is pretty small. If I switch over to looking at crystals at
>> Mouser, the
>> frequency choices are a lot greater. Yes, as with the oscillators you need to
>> sort out
>> the ones that aren’t going to cut it.
>> 
>> To your point - no, you can’t get anything / any frequency through
>> distribution. That’s
>> true both of oscillators and of crystals. You just more picks with the
>> crystals.
>> 
>> Bob
>> 
>>> 
>>> The last time I bought a special frequency osc was over 10 years ago.  Once
>>> I
>>> found the right company, things were simple.  I don't remember the price.
>>> At
>>> the time, it seemed reasonable, but that was for a commercial project rather
>>> than a basement lab.
>>> 
>>> Do those companies still exist or have they all fallen through the cracks of
>>> higher volumes and lower prices.
>>> 
>>> 
>>> --
>>> These are my opinions.  I hate spam.
>>> 
>>> 
>>> 
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> 
> 
> -- 
> "If you don't know what it is,
> don't poke it."
> Ghost in the Shell
> -------------------------------
> "Noli sinere nothos te opprimere"
> 
> Dr. Don Latham, AJ7LL
> Six Mile Systems LLC, 17850 Six Mile Road
> Huson, MT, 59846
> mailing address:  POBox 404
> Frenchtown MT 59834-0404
> 
> VOX 406-626-4304
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> 
> 
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