[R-390] Crystal 200 KC

[Bob Camp]

Hi

The problem with the 200 Kc crystals is that they are not a "normal"  
low frequency cut. You have to chop quartz at a special angle for oven  
crystals at that frequency.

It's not going to be easy to find somebody doing that.

Bob


On Feb 23, 2008, at 10:31 PM, roy.morgan at nist.gov wrote:

> Quoting Patrick <brookbank at triad.rr.com>:
>
>> Wow, the last post went OK ok, could someone let me now a source  
>> for a 200
>> kc crystal and aprox. the cost??? Thank....Pat
>
> Patrick,
>
> There have been found one or two souces of low frequency crystals.   
> Most
> manufacturers will not make them any more.
>
> There have been reports of one fellow in Mexico I think, but I don't  
> have any
> info on that source.
>
> The only other one reputed to make low frequency crystals is:
>
>
> Universal Crystals Inc.
> Jim Little
> Private Company, Headquarters Location
> 5407 Payne St., Shawnee Mission KS 66226,
> United States
> (913) 334-6254,
> Line of Business: Manufacturing: Quartz crystals
>
> Here is the source of my information:
>
> To: <PHIL13 at STNY.RR.COM>; "Collins Reflector Posting" <collins at listserve.com 
> >
> Sent: Friday, July 01, 2005 12:46 PM
> Subject: Re: {Collins} xtal-75a-1
>
> At 03:52 PM 6/30/2005, you wrote:
> Is there a source for the 500 kc xtal for the 75a-1? or does someone  
> have one to
> sell?
>
> Phil and others,
> I have just gotten the following from Glenn Nash about a source for  
> low
> frequency crystals:
>
>  "Mel" is the guy at:
> www.mhelectronics.com.  (800 643 9825)
>
> Mel said that the best guy on the planet for those is : Universal  
> Xtal in
> Kansas City, phone 913-334-6254 ask for Jim Little.
>
> I called Little and lo and behold he says he bought up just about  
> every low
> frequency xtal blank in the US and is at this very minute cranking  
> out a bunch
> of 455KC types. They are a bit expensive, around $50, but less than  
> half what
> International Xtal gets for their low freqs.
>
> Try to contact  "Mel" and let us know what you find out, please.
>
> Roy
>
>
> Roy Morgan
> 13033 Downey Mill Road
> Lovettsville VA 20180
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