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Dan Kemppainen

Sun, Feb 28, 2021 11:35 PM

Hi All,

I've picked up a couple of old crystals. Mostly because they look neat.
They are 1Mhz, in a glass tube. The quartz is ~25mm dia, at about 1 mm
thick. Was able to get them to oscillate using a Colpitts circuit. They
will oscillate at 2.851Mhz (probably some strange mode) if given the
chance.

I've been scouring my reference books here, and haven't had much luck
finding any details on how one would even guess at the parameters of a
quartz like this.

There area few numbers on them, 33 stamped on the side, 1000 (KHz???) on
the top, 87 on the top, and hand written 501 (probably a SN). Digging on
line, I'd guess an AT cut based on thickness. I'm guessing the 33 is
capacitance in pF. 87, might be year.

If any of you have any suggestions on where to find information on how
to get something like this to oscillate properly, guess at correct
parameters, or even measure any of the parameters I would really
appreciate it.

I'm sure these are really nothing special, but it would be neat to give
them a fighting chance to show what they can or can't do without
breaking them!

Thanks,
Dan

Hi All, I've picked up a couple of old crystals. Mostly because they look neat. They are 1Mhz, in a glass tube. The quartz is ~25mm dia, at about 1 mm thick. Was able to get them to oscillate using a Colpitts circuit. They will oscillate at 2.851Mhz (probably some strange mode) if given the chance. I've been scouring my reference books here, and haven't had much luck finding any details on how one would even guess at the parameters of a quartz like this. There area few numbers on them, 33 stamped on the side, 1000 (KHz???) on the top, 87 on the top, and hand written 501 (probably a SN). Digging on line, I'd guess an AT cut based on thickness. I'm guessing the 33 is capacitance in pF. 87, might be year. If any of you have any suggestions on where to find information on how to get something like this to oscillate properly, guess at correct parameters, or even measure any of the parameters I would really appreciate it. I'm sure these are really nothing special, but it would be neat to give them a fighting chance to show what they can or can't do without breaking them! Thanks, Dan

BA

Bob Albert

Sun, Feb 28, 2021 11:58 PM

Is that a PR Peterson Radio logo?
On Sunday, February 28, 2021, 03:53:32 PM PST, Dan Kemppainen dan@irtelemetrics.com wrote:

Hi All,

I've picked up a couple of old crystals. Mostly because they look neat.
They are 1Mhz, in a glass tube. The quartz is ~25mm dia, at about 1 mm
thick. Was able to get them to oscillate using a Colpitts circuit. They
will oscillate at 2.851Mhz (probably some strange mode) if given the
chance.

I've been scouring my reference books here, and haven't had much luck
finding any details on how one would even guess at the parameters of a
quartz like this.

There area few numbers on them, 33 stamped on the side, 1000 (KHz???) on
the top, 87 on the top, and hand written 501 (probably a SN). Digging on
line, I'd guess an AT cut based on thickness. I'm guessing the 33 is
capacitance in pF. 87, might be year.

If any of you have any suggestions on where to find information on how
to get something like this to oscillate properly, guess at correct
parameters, or even measure any of the parameters I would really
appreciate it.

I'm sure these are really nothing special, but it would be neat to give
them a fighting chance to show what they can or can't do without
breaking them!

Thanks,
Dan

time-nuts mailing list -- time-nuts@lists.febo.com
To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com
and follow the instructions there.

Is that a PR Peterson Radio logo? On Sunday, February 28, 2021, 03:53:32 PM PST, Dan Kemppainen <dan@irtelemetrics.com> wrote: Hi All, I've picked up a couple of old crystals. Mostly because they look neat. They are 1Mhz, in a glass tube. The quartz is ~25mm dia, at about 1 mm thick. Was able to get them to oscillate using a Colpitts circuit. They will oscillate at 2.851Mhz (probably some strange mode) if given the chance. I've been scouring my reference books here, and haven't had much luck finding any details on how one would even guess at the parameters of a quartz like this. There area few numbers on them, 33 stamped on the side, 1000 (KHz???) on the top, 87 on the top, and hand written 501 (probably a SN). Digging on line, I'd guess an AT cut based on thickness. I'm guessing the 33 is capacitance in pF. 87, might be year. If any of you have any suggestions on where to find information on how to get something like this to oscillate properly, guess at correct parameters, or even measure any of the parameters I would really appreciate it. I'm sure these are really nothing special, but it would be neat to give them a fighting chance to show what they can or can't do without breaking them! Thanks, Dan _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.

E

EB4APL

Mon, Mar 1, 2021 12:11 AM

Hi,

If you have access to a Network Analyzer, either Scalar or Vector, you
can measure the crystal parameters. You need a test fixture (homemade)
to convert the impedance to 12.5 Ohm and you sweep the crystal to obtain
its serial resonance and the -3dB points. From these there are formulas
to obtain the motional resistance, inductance and capacitance, and the
crystal Q. Even some low cost hobby type analyzers have a mode for
measuring crystals with these calculations integrated.

Regards,

Ignacio EB4APL

El 01/03/2021 a las 0:35, Dan Kemppainen escribió:

Hi All,

I've picked up a couple of old crystals. Mostly because they look
neat. They are 1Mhz, in a glass tube. The quartz is ~25mm dia, at
about 1 mm thick. Was able to get them to oscillate using a Colpitts
circuit. They will oscillate at 2.851Mhz (probably some strange mode)
if given the chance.

I've been scouring my reference books here, and haven't had much luck
finding any details on how one would even guess at the parameters of a
quartz like this.

There area few numbers on them, 33 stamped on the side, 1000 (KHz???)
on the top, 87 on the top, and hand written 501 (probably a SN).
Digging on line, I'd guess an AT cut based on thickness. I'm guessing
the 33 is capacitance in pF. 87, might be year.

If any of you have any suggestions on where to find information on how
to get something like this to oscillate properly, guess at correct
parameters, or even measure any of the parameters I would really
appreciate it.

I'm sure these are really nothing special, but it would be neat to
give them a fighting chance to show what they can or can't do without
breaking them!

Thanks,
Dan

--
El software de antivirus Avast ha analizado este correo electrónico en busca de virus.
https://www.avast.com/antivirus

Hi, If you have access to a Network Analyzer, either Scalar or Vector, you can measure the crystal parameters. You need a test fixture (homemade) to convert the impedance to 12.5 Ohm and you sweep the crystal to obtain its serial resonance and the -3dB points. From these there are formulas to obtain the motional resistance, inductance and capacitance, and the crystal Q. Even some low cost hobby type analyzers have a mode for measuring crystals with these calculations integrated. Regards, Ignacio EB4APL El 01/03/2021 a las 0:35, Dan Kemppainen escribió: > Hi All, > > I've picked up a couple of old crystals. Mostly because they look > neat. They are 1Mhz, in a glass tube. The quartz is ~25mm dia, at > about 1 mm thick. Was able to get them to oscillate using a Colpitts > circuit. They will oscillate at 2.851Mhz (probably some strange mode) > if given the chance. > > I've been scouring my reference books here, and haven't had much luck > finding any details on how one would even guess at the parameters of a > quartz like this. > > There area few numbers on them, 33 stamped on the side, 1000 (KHz???) > on the top, 87 on the top, and hand written 501 (probably a SN). > Digging on line, I'd guess an AT cut based on thickness. I'm guessing > the 33 is capacitance in pF. 87, might be year. > > If any of you have any suggestions on where to find information on how > to get something like this to oscillate properly, guess at correct > parameters, or even measure any of the parameters I would really > appreciate it. > > I'm sure these are really nothing special, but it would be neat to > give them a fighting chance to show what they can or can't do without > breaking them! > > Thanks, > Dan -- El software de antivirus Avast ha analizado este correo electrónico en busca de virus. https://www.avast.com/antivirus

KW

Ken Winterling

Mon, Mar 1, 2021 12:12 AM

I am restoring my first Hallicrafters SX-100 Mark 2 and found this 100kc
XTAL in the calibrator.
It works perfectly.

[image: Hallicrafters SX-100 100kc XTAL Calibrator.jpg]
[image: Hallicrafters SX-100 100kc XTAL For Calibrator.jpg]
Ken
WA2LBI

On Sun, Feb 28, 2021 at 6:53 PM Dan Kemppainen dan@irtelemetrics.com
wrote:

Hi All,

I've picked up a couple of old crystals. Mostly because they look neat.
They are 1Mhz, in a glass tube. The quartz is ~25mm dia, at about 1 mm
thick. Was able to get them to oscillate using a Colpitts circuit. They
will oscillate at 2.851Mhz (probably some strange mode) if given the
chance.

I've been scouring my reference books here, and haven't had much luck
finding any details on how one would even guess at the parameters of a
quartz like this.

There area few numbers on them, 33 stamped on the side, 1000 (KHz???) on
the top, 87 on the top, and hand written 501 (probably a SN). Digging on
line, I'd guess an AT cut based on thickness. I'm guessing the 33 is
capacitance in pF. 87, might be year.

If any of you have any suggestions on where to find information on how
to get something like this to oscillate properly, guess at correct
parameters, or even measure any of the parameters I would really
appreciate it.

I'm sure these are really nothing special, but it would be neat to give
them a fighting chance to show what they can or can't do without
breaking them!

Thanks,
Dan

time-nuts mailing list -- time-nuts@lists.febo.com
To unsubscribe, go to
http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com
and follow the instructions there.

I am restoring my first Hallicrafters SX-100 Mark 2 and found this 100kc XTAL in the calibrator. It works perfectly. [image: Hallicrafters SX-100 100kc XTAL Calibrator.jpg] [image: Hallicrafters SX-100 100kc XTAL For Calibrator.jpg] Ken WA2LBI On Sun, Feb 28, 2021 at 6:53 PM Dan Kemppainen <dan@irtelemetrics.com> wrote: > Hi All, > > I've picked up a couple of old crystals. Mostly because they look neat. > They are 1Mhz, in a glass tube. The quartz is ~25mm dia, at about 1 mm > thick. Was able to get them to oscillate using a Colpitts circuit. They > will oscillate at 2.851Mhz (probably some strange mode) if given the > chance. > > I've been scouring my reference books here, and haven't had much luck > finding any details on how one would even guess at the parameters of a > quartz like this. > > There area few numbers on them, 33 stamped on the side, 1000 (KHz???) on > the top, 87 on the top, and hand written 501 (probably a SN). Digging on > line, I'd guess an AT cut based on thickness. I'm guessing the 33 is > capacitance in pF. 87, might be year. > > If any of you have any suggestions on where to find information on how > to get something like this to oscillate properly, guess at correct > parameters, or even measure any of the parameters I would really > appreciate it. > > I'm sure these are really nothing special, but it would be neat to give > them a fighting chance to show what they can or can't do without > breaking them! > > Thanks, > Dan > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. >

BK

Bob kb8tq

Mon, Mar 1, 2021 12:22 AM

Hi

Best guess is that it’s a 1 MHz fundamental. Your magic circuit is
running it on the third overtone.

Past that:
AT cut? Probably.
32 pf load? maybe.
Heated application? maybe.
Russian manufacture? yup

Bob

On Feb 28, 2021, at 6:35 PM, Dan Kemppainen dan@irtelemetrics.com wrote:

Hi All,

I've picked up a couple of old crystals. Mostly because they look neat. They are 1Mhz, in a glass tube. The quartz is ~25mm dia, at about 1 mm thick. Was able to get them to oscillate using a Colpitts circuit. They will oscillate at 2.851Mhz (probably some strange mode) if given the chance.

I've been scouring my reference books here, and haven't had much luck finding any details on how one would even guess at the parameters of a quartz like this.

There area few numbers on them, 33 stamped on the side, 1000 (KHz???) on the top, 87 on the top, and hand written 501 (probably a SN). Digging on line, I'd guess an AT cut based on thickness. I'm guessing the 33 is capacitance in pF. 87, might be year.

If any of you have any suggestions on where to find information on how to get something like this to oscillate properly, guess at correct parameters, or even measure any of the parameters I would really appreciate it.

I'm sure these are really nothing special, but it would be neat to give them a fighting chance to show what they can or can't do without breaking them!

Thanks,
Dan
<OldXtal.jpg>_______________________________________________
time-nuts mailing list -- time-nuts@lists.febo.com
To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com
and follow the instructions there.

Hi Best guess is that it’s a 1 MHz fundamental. Your magic circuit is running it on the third overtone. Past that: AT cut? Probably. 32 pf load? maybe. Heated application? maybe. Russian manufacture? yup Bob > On Feb 28, 2021, at 6:35 PM, Dan Kemppainen <dan@irtelemetrics.com> wrote: > > Hi All, > > I've picked up a couple of old crystals. Mostly because they look neat. They are 1Mhz, in a glass tube. The quartz is ~25mm dia, at about 1 mm thick. Was able to get them to oscillate using a Colpitts circuit. They will oscillate at 2.851Mhz (probably some strange mode) if given the chance. > > I've been scouring my reference books here, and haven't had much luck finding any details on how one would even guess at the parameters of a quartz like this. > > There area few numbers on them, 33 stamped on the side, 1000 (KHz???) on the top, 87 on the top, and hand written 501 (probably a SN). Digging on line, I'd guess an AT cut based on thickness. I'm guessing the 33 is capacitance in pF. 87, might be year. > > If any of you have any suggestions on where to find information on how to get something like this to oscillate properly, guess at correct parameters, or even measure any of the parameters I would really appreciate it. > > I'm sure these are really nothing special, but it would be neat to give them a fighting chance to show what they can or can't do without breaking them! > > Thanks, > Dan > <OldXtal.jpg>_______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there.

AK

Attila Kinali

Mon, Mar 1, 2021 12:23 AM

On Sun, 28 Feb 2021 18:35:57 -0500
Dan Kemppainen dan@irtelemetrics.com wrote:

If any of you have any suggestions on where to find information on how
to get something like this to oscillate properly, guess at correct
parameters, or even measure any of the parameters I would really
appreciate it.

The best way would be to use a network analyzer and measure
the crystals LCR parameters. Using that you can use the
standard harmonic oscillator literature (Parzen, Frerking,...)
to design the circuit.

I seem to have misplaced my literature on how to measure
crystal oscillators. But if you search for "Neubig" and
"crystal measurement", you should be able to find some of
the nice documents that Bernd Neubig has written on the topic.

		Attila Kinali

--
The driving force behind research is the question: "Why?"
There are things we don't understand and things we always
wonder about. And that's why we do research.
-- Kobayashi Makoto

On Sun, 28 Feb 2021 18:35:57 -0500 Dan Kemppainen <dan@irtelemetrics.com> wrote: > If any of you have any suggestions on where to find information on how > to get something like this to oscillate properly, guess at correct > parameters, or even measure any of the parameters I would really > appreciate it. The best way would be to use a network analyzer and measure the crystals LCR parameters. Using that you can use the standard harmonic oscillator literature (Parzen, Frerking,...) to design the circuit. I seem to have misplaced my literature on how to measure crystal oscillators. But if you search for "Neubig" and "crystal measurement", you should be able to find some of the nice documents that Bernd Neubig has written on the topic. Attila Kinali -- The driving force behind research is the question: "Why?" There are things we don't understand and things we always wonder about. And that's why we do research. -- Kobayashi Makoto

JN

Jeremy Nichols

Mon, Mar 1, 2021 12:25 AM

Here’s something similar, made by HP a in the early 70s. It’s a 1 MHz
crystal, used in a predecessor to the 105B Frequency Standard. Similar
construction to yours.

On Sun, Feb 28, 2021 at 4:10 PM Bob Albert via time-nuts <
time-nuts@lists.febo.com> wrote:

Is that a PR Peterson Radio logo?
On Sunday, February 28, 2021, 03:53:32 PM PST, Dan Kemppainen <
dan@irtelemetrics.com> wrote:

Hi All,

I've picked up a couple of old crystals. Mostly because they look neat.
They are 1Mhz, in a glass tube. The quartz is ~25mm dia, at about 1 mm
thick. Was able to get them to oscillate using a Colpitts circuit. They
will oscillate at 2.851Mhz (probably some strange mode) if given the
chance.

I've been scouring my reference books here, and haven't had much luck
finding any details on how one would even guess at the parameters of a
quartz like this.

There area few numbers on them, 33 stamped on the side, 1000 (KHz???) on
the top, 87 on the top, and hand written 501 (probably a SN). Digging on
line, I'd guess an AT cut based on thickness. I'm guessing the 33 is
capacitance in pF. 87, might be year.

If any of you have any suggestions on where to find information on how
to get something like this to oscillate properly, guess at correct
parameters, or even measure any of the parameters I would really
appreciate it.

I'm sure these are really nothing special, but it would be neat to give
them a fighting chance to show what they can or can't do without
breaking them!

Thanks,
Dan

time-nuts mailing list -- time-nuts@lists.febo.com
To unsubscribe, go to
http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com
and follow the instructions there.

--
Jeremy Nichols
Sent from my iPad 6.

Here’s something similar, made by HP a in the early 70s. It’s a 1 MHz crystal, used in a predecessor to the 105B Frequency Standard. Similar construction to yours. On Sun, Feb 28, 2021 at 4:10 PM Bob Albert via time-nuts < time-nuts@lists.febo.com> wrote: > Is that a PR Peterson Radio logo? > On Sunday, February 28, 2021, 03:53:32 PM PST, Dan Kemppainen < > dan@irtelemetrics.com> wrote: > > Hi All, > > I've picked up a couple of old crystals. Mostly because they look neat. > They are 1Mhz, in a glass tube. The quartz is ~25mm dia, at about 1 mm > thick. Was able to get them to oscillate using a Colpitts circuit. They > will oscillate at 2.851Mhz (probably some strange mode) if given the > chance. > > I've been scouring my reference books here, and haven't had much luck > finding any details on how one would even guess at the parameters of a > quartz like this. > > There area few numbers on them, 33 stamped on the side, 1000 (KHz???) on > the top, 87 on the top, and hand written 501 (probably a SN). Digging on > line, I'd guess an AT cut based on thickness. I'm guessing the 33 is > capacitance in pF. 87, might be year. > > If any of you have any suggestions on where to find information on how > to get something like this to oscillate properly, guess at correct > parameters, or even measure any of the parameters I would really > appreciate it. > > I'm sure these are really nothing special, but it would be neat to give > them a fighting chance to show what they can or can't do without > breaking them! > > Thanks, > Dan > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. > > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. > -- Jeremy Nichols Sent from my iPad 6.

EB

ed breya

Mon, Mar 1, 2021 12:53 AM

I have some similar, that came from some old HP OCXOs. They look like
they were built inside octal tube envelopes, without the pin bases. I'm
pretty sure they are 1 MHz, and came from some HP51110 (I think ?)
reference generators, part of one of their ancient synthesizers - it was
a two-piece rack mount beast, with bundles of coax between. I junked
them out long ago, and saved the ovens and crystals and some other stuff
for possible reuse. I also have some others from ancient, unidentified gear.

One thing I recall is that at least in one, or maybe all, the crystal
itself is shaped like a double-convex optical lens, not a flat disc.

Ed

I have some similar, that came from some old HP OCXOs. They look like they were built inside octal tube envelopes, without the pin bases. I'm pretty sure they are 1 MHz, and came from some HP51110 (I think ?) reference generators, part of one of their ancient synthesizers - it was a two-piece rack mount beast, with bundles of coax between. I junked them out long ago, and saved the ovens and crystals and some other stuff for possible reuse. I also have some others from ancient, unidentified gear. One thing I recall is that at least in one, or maybe all, the crystal itself is shaped like a double-convex optical lens, not a flat disc. Ed

AG

Adrian Godwin

Mon, Mar 1, 2021 1:03 AM

I've got one with a similar shape crystal wafer but packaged in a glass
HC6/U package. However most of the glass-packaged crystals I've seen have
been in a small vacuum-tube style package with a long, narrow strip of
crystal. I think 16kHz is the lowest I've seen.

On Mon, Mar 1, 2021 at 12:10 AM Bob Albert via time-nuts <
time-nuts@lists.febo.com> wrote:

Is that a PR Peterson Radio logo?
On Sunday, February 28, 2021, 03:53:32 PM PST, Dan Kemppainen <
dan@irtelemetrics.com> wrote:

Hi All,

I've picked up a couple of old crystals. Mostly because they look neat.
They are 1Mhz, in a glass tube. The quartz is ~25mm dia, at about 1 mm
thick. Was able to get them to oscillate using a Colpitts circuit. They
will oscillate at 2.851Mhz (probably some strange mode) if given the
chance.

I've been scouring my reference books here, and haven't had much luck
finding any details on how one would even guess at the parameters of a
quartz like this.

There area few numbers on them, 33 stamped on the side, 1000 (KHz???) on
the top, 87 on the top, and hand written 501 (probably a SN). Digging on
line, I'd guess an AT cut based on thickness. I'm guessing the 33 is
capacitance in pF. 87, might be year.

If any of you have any suggestions on where to find information on how
to get something like this to oscillate properly, guess at correct
parameters, or even measure any of the parameters I would really
appreciate it.

I'm sure these are really nothing special, but it would be neat to give
them a fighting chance to show what they can or can't do without
breaking them!

Thanks,
Dan

time-nuts mailing list -- time-nuts@lists.febo.com
To unsubscribe, go to
http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com
and follow the instructions there.

I've got one with a similar shape crystal wafer but packaged in a glass HC6/U package. However most of the glass-packaged crystals I've seen have been in a small vacuum-tube style package with a long, narrow strip of crystal. I think 16kHz is the lowest I've seen. On Mon, Mar 1, 2021 at 12:10 AM Bob Albert via time-nuts < time-nuts@lists.febo.com> wrote: > Is that a PR Peterson Radio logo? > On Sunday, February 28, 2021, 03:53:32 PM PST, Dan Kemppainen < > dan@irtelemetrics.com> wrote: > > Hi All, > > I've picked up a couple of old crystals. Mostly because they look neat. > They are 1Mhz, in a glass tube. The quartz is ~25mm dia, at about 1 mm > thick. Was able to get them to oscillate using a Colpitts circuit. They > will oscillate at 2.851Mhz (probably some strange mode) if given the > chance. > > I've been scouring my reference books here, and haven't had much luck > finding any details on how one would even guess at the parameters of a > quartz like this. > > There area few numbers on them, 33 stamped on the side, 1000 (KHz???) on > the top, 87 on the top, and hand written 501 (probably a SN). Digging on > line, I'd guess an AT cut based on thickness. I'm guessing the 33 is > capacitance in pF. 87, might be year. > > If any of you have any suggestions on where to find information on how > to get something like this to oscillate properly, guess at correct > parameters, or even measure any of the parameters I would really > appreciate it. > > I'm sure these are really nothing special, but it would be neat to give > them a fighting chance to show what they can or can't do without > breaking them! > > Thanks, > Dan > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. > > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. >

DG

David G. McGaw

Mon, Mar 1, 2021 1:39 AM

Stamp on the top is 1000 kHz in Russian.

David N1HAC

On 2/28/21 6:35 PM, Dan Kemppainen wrote:

Hi All,

I've picked up a couple of old crystals. Mostly because they look
neat. They are 1Mhz, in a glass tube. The quartz is ~25mm dia, at
about 1 mm thick. Was able to get them to oscillate using a Colpitts
circuit. They will oscillate at 2.851Mhz (probably some strange mode)
if given the chance.

I've been scouring my reference books here, and haven't had much luck
finding any details on how one would even guess at the parameters of a
quartz like this.

There area few numbers on them, 33 stamped on the side, 1000 (KHz???)
on the top, 87 on the top, and hand written 501 (probably a SN).
Digging on line, I'd guess an AT cut based on thickness. I'm guessing
the 33 is capacitance in pF. 87, might be year.

If any of you have any suggestions on where to find information on how
to get something like this to oscillate properly, guess at correct
parameters, or even measure any of the parameters I would really
appreciate it.

I'm sure these are really nothing special, but it would be neat to
give them a fighting chance to show what they can or can't do without
breaking them!

Thanks,
Dan

time-nuts mailing list -- time-nuts@lists.febo.com
To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com
and follow the instructions there.

Stamp on the top is 1000 kHz in Russian. David N1HAC On 2/28/21 6:35 PM, Dan Kemppainen wrote: > Hi All, > > I've picked up a couple of old crystals. Mostly because they look > neat. They are 1Mhz, in a glass tube. The quartz is ~25mm dia, at > about 1 mm thick. Was able to get them to oscillate using a Colpitts > circuit. They will oscillate at 2.851Mhz (probably some strange mode) > if given the chance. > > I've been scouring my reference books here, and haven't had much luck > finding any details on how one would even guess at the parameters of a > quartz like this. > > There area few numbers on them, 33 stamped on the side, 1000 (KHz???) > on the top, 87 on the top, and hand written 501 (probably a SN). > Digging on line, I'd guess an AT cut based on thickness. I'm guessing > the 33 is capacitance in pF. 87, might be year. > > If any of you have any suggestions on where to find information on how > to get something like this to oscillate properly, guess at correct > parameters, or even measure any of the parameters I would really > appreciate it. > > I'm sure these are really nothing special, but it would be neat to > give them a fighting chance to show what they can or can't do without > breaking them! > > Thanks, > Dan > > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there.

time-nuts@lists.febo.com

Old Crystal.