[time-nuts] Interesting looking crystal on ebay
lists at rtty.us
Fri Mar 8 07:03:59 EST 2013
The 100 KHz IF with a series of LF crystals goes *way* back. The early implementations were tube based.
Your 100 KHz crystal should oscillate with any of the standard watch crystal circuits. If not, there may well be a wire loose in the oven.
On Mar 7, 2013, at 10:19 PM, Max Robinson <max at maxsmusicplace.com> wrote:
> I have in my collection of objects, my wife calls it junk, a 100 kHz crystal in a package that looks like an octal base tube. It was cast off from somewhere and is in an oven but I can't find a circuit that will make it oscillate at 100 kHz. That is probably the reason it was cast off. An HP wave analyzer, model number forgotten, used several similar appearing crystals in the narrow band filter of the 100 kHz IF. Also the HP 3570A network analyzer uses three of them the 100 kHz IF in each channel. It wouldn't surprise me to learn that the same engineer designed the IF strip for both instruments.
> Max. K 4 O DS.
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> ----- Original Message ----- From: "David Kirkby" <david.kirkby at onetel.net>
> To: "Discussion of precise time and frequency measurement" <time-nuts at febo.com>
> Sent: Thursday, March 07, 2013 4:50 AM
> Subject: [time-nuts] Interesting looking crystal on ebay
>> This is certainly not time-nut standard, but I've never personally
>> seen a crystal like this.
>> I guess it has so many pins so it fits in a valve base.
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