Empathy List Archives

CH

Christopher Hoover

Wed, Nov 23, 2016 8:25 PM

Part number decoder on page 4 of:

http://www.mouser.com/catalog/supplier/library/pdf/AVXGlassDielectric.pdf

CY = glass
06 = case size
C = operating temp (-55 C to +125 C)
240 = 24 pF
J = tolerance (+/- 5%)

On Wed, Nov 23, 2016 at 12:19 PM, Christopher Hoover ch@murgatroid.com
wrote:

OK, I think this folded-over cap sets the nominal XO frequency:

(link in case it doesn't go through: https://goo.gl/photos
/XHUCKTnC3NAB5rKD6 )

I read the p/n as CY06C240J. 24 pFs? CGW would seem to be Corning Glass
Works.

On Wed, Nov 23, 2016 at 8:57 AM, Tom Van Baak tvb@leapsecond.com wrote:

Chris enjoying the pictures. Most likely I will never run into one of

these

oscillators. But it is nice to know that you have gone "where no man has
gone before". Star Trek? Not sure.
Regards
Paul
WB8TSL

Paul,

I have quite a few vintage FTS 1200's here and will be doing a grand
comparison in a few months. They are known for extremely good ADEV, way
down in the -13's. I'll put your name on one of them.

/tvb

time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/m
ailman/listinfo/time-nuts
and follow the instructions there.

Part number decoder on page 4 of: http://www.mouser.com/catalog/supplier/library/pdf/AVXGlassDielectric.pdf CY = glass 06 = case size C = operating temp (-55 C to +125 C) 240 = 24 pF J = tolerance (+/- 5%) On Wed, Nov 23, 2016 at 12:19 PM, Christopher Hoover <ch@murgatroid.com> wrote: > OK, I think this folded-over cap sets the nominal XO frequency: > > (link in case it doesn't go through: https://goo.gl/photos > /XHUCKTnC3NAB5rKD6 ) > > I read the p/n as CY06C240J. 24 pFs? CGW would seem to be Corning Glass > Works. > > > > > On Wed, Nov 23, 2016 at 8:57 AM, Tom Van Baak <tvb@leapsecond.com> wrote: > >> > Chris enjoying the pictures. Most likely I will never run into one of >> these >> > oscillators. But it is nice to know that you have gone "where no man has >> > gone before". Star Trek? Not sure. >> > Regards >> > Paul >> > WB8TSL >> >> Paul, >> >> I have quite a few vintage FTS 1200's here and will be doing a grand >> comparison in a few months. They are known for extremely good ADEV, way >> down in the -13's. I'll put your name on one of them. >> >> /tvb >> _______________________________________________ >> time-nuts mailing list -- time-nuts@febo.com >> To unsubscribe, go to https://www.febo.com/cgi-bin/m >> ailman/listinfo/time-nuts >> and follow the instructions there. >> > >

CH

Christopher Hoover

Wed, Nov 23, 2016 8:30 PM

And of course it is a discontinued part.

Taking suggestions for a replacement. COG(NP0)?

On Wed, Nov 23, 2016 at 12:25 PM, Christopher Hoover ch@murgatroid.com
wrote:

Part number decoder on page 4 of:

http://www.mouser.com/catalog/supplier/library/pdf/AVXGlassDielectric.pdf

CY = glass
06 = case size
C = operating temp (-55 C to +125 C)
240 = 24 pF
J = tolerance (+/- 5%)

On Wed, Nov 23, 2016 at 12:19 PM, Christopher Hoover ch@murgatroid.com
wrote:

OK, I think this folded-over cap sets the nominal XO frequency:

(link in case it doesn't go through: https://goo.gl/photos
/XHUCKTnC3NAB5rKD6 )

I read the p/n as CY06C240J. 24 pFs? CGW would seem to be Corning
Glass Works.

On Wed, Nov 23, 2016 at 8:57 AM, Tom Van Baak tvb@leapsecond.com wrote:

Chris enjoying the pictures. Most likely I will never run into one of

these

oscillators. But it is nice to know that you have gone "where no man

has

gone before". Star Trek? Not sure.
Regards
Paul
WB8TSL

Paul,

I have quite a few vintage FTS 1200's here and will be doing a grand
comparison in a few months. They are known for extremely good ADEV, way
down in the -13's. I'll put your name on one of them.

/tvb

time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/m
ailman/listinfo/time-nuts
and follow the instructions there.

And of course it is a discontinued part. Taking suggestions for a replacement. COG(NP0)? On Wed, Nov 23, 2016 at 12:25 PM, Christopher Hoover <ch@murgatroid.com> wrote: > Part number decoder on page 4 of: > > http://www.mouser.com/catalog/supplier/library/pdf/AVXGlassDielectric.pdf > > CY = glass > 06 = case size > C = operating temp (-55 C to +125 C) > 240 = 24 pF > J = tolerance (+/- 5%) > > > > On Wed, Nov 23, 2016 at 12:19 PM, Christopher Hoover <ch@murgatroid.com> > wrote: > >> OK, I think this folded-over cap sets the nominal XO frequency: >> >> (link in case it doesn't go through: https://goo.gl/photos >> /XHUCKTnC3NAB5rKD6 ) >> >> I read the p/n as CY06C240J. 24 pFs? CGW would seem to be Corning >> Glass Works. >> >> >> >> >> On Wed, Nov 23, 2016 at 8:57 AM, Tom Van Baak <tvb@leapsecond.com> wrote: >> >>> > Chris enjoying the pictures. Most likely I will never run into one of >>> these >>> > oscillators. But it is nice to know that you have gone "where no man >>> has >>> > gone before". Star Trek? Not sure. >>> > Regards >>> > Paul >>> > WB8TSL >>> >>> Paul, >>> >>> I have quite a few vintage FTS 1200's here and will be doing a grand >>> comparison in a few months. They are known for extremely good ADEV, way >>> down in the -13's. I'll put your name on one of them. >>> >>> /tvb >>> _______________________________________________ >>> time-nuts mailing list -- time-nuts@febo.com >>> To unsubscribe, go to https://www.febo.com/cgi-bin/m >>> ailman/listinfo/time-nuts >>> and follow the instructions there. >>> >> >> >

CS

Charles Steinmetz

Thu, Nov 24, 2016 1:55 AM

Christopher wrote:

And of course it is a discontinued part.

Taking suggestions for a replacement. COG(NP0)?

I applaud your ingenuity and resourcefulness in tackling this project!
I just love seeing nice old tech restored to service.

Your three basic choices are mica, C0G/NP0 ceramic, and porcelain (a
different type of ceramic). For this application, you want the highest
Q available (which is probably why the original is a glass capacitor).
Porcelain wins that contest hands down, and all of its other specs are
competitive with or superior to the others. They are also free of
microphonics.

Digi-Key carries the AVX SQ Series (AVX calls them "Microwave MLCs"):

http://www.digikey.com/en/product-highlight/a/avx/microwave-multi-layer-capacitors

http://www.digikey.com/catalog/en/partgroup/sq-series/3895?mpart=SQCB7M220JAJME&vendor=478

There are other manufacturers, but I don't believe anyone makes
porcelain through-hole parts anymore. You will probably end up
soldering leads onto one or a stack of SMD chips. It appears that the
original capacitor is installed in sockets. Measure the lead diameter,
and use the same size wire. Or just clip the leads off the original and
re-use them.

Note that the original glass capacitor has a tempco of about +140 ppm/C,
and the porcelain and C0G/NP0 parts are close to zero. This raises the
question whether the capacitor was intended to provide temperature
compensation (or whether other circuit elements have tailored tempcos to
offset the capacitor tempco). Since the capacitor is in a
temperature-stabilized environment, this is probably not critical.

Best regards,

Charles

Christopher wrote: > And of course it is a discontinued part. > > Taking suggestions for a replacement. COG(NP0)? I applaud your ingenuity and resourcefulness in tackling this project! I just love seeing nice old tech restored to service. Your three basic choices are mica, C0G/NP0 ceramic, and porcelain (a different type of ceramic). For this application, you want the highest Q available (which is probably why the original is a glass capacitor). Porcelain wins that contest hands down, and all of its other specs are competitive with or superior to the others. They are also free of microphonics. Digi-Key carries the AVX SQ Series (AVX calls them "Microwave MLCs"): <http://www.digikey.com/en/product-highlight/a/avx/microwave-multi-layer-capacitors> <http://www.digikey.com/catalog/en/partgroup/sq-series/3895?mpart=SQCB7M220JAJME&vendor=478> There are other manufacturers, but I don't believe anyone makes porcelain through-hole parts anymore. You will probably end up soldering leads onto one or a stack of SMD chips. It appears that the original capacitor is installed in sockets. Measure the lead diameter, and use the same size wire. Or just clip the leads off the original and re-use them. Note that the original glass capacitor has a tempco of about +140 ppm/C, and the porcelain and C0G/NP0 parts are close to zero. This raises the question whether the capacitor was intended to provide temperature compensation (or whether other circuit elements have tailored tempcos to offset the capacitor tempco). Since the capacitor is in a temperature-stabilized environment, this is probably not critical. Best regards, Charles

time-nuts@lists.febo.com

Re: [time-nuts] Inside of FT1200-100