I am attaching a file showing the schematic for the trap used in a Colpitts
oscillator which will look like 58pF at 5MHz and will be inductive at
5.5MHz. So something like this can be used in place of a pair of one of
the split capacitors at ~56pF loading the crystal.
Jerry N9XR
On Sat, Jul 18,
Hi
There are an enormous number of variations on the basic SC trap. Most of
what drives one to be “best” is the component selection process. If a coil above
X uh simply will not fit, time for a new circuit ….
Bob
On Jul 19, 2015, at 12:53 AM, jerry shirᴀr radio.n...@gmail.com wrote:
I am
-
From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Bob Camp
Sent: Sunday, July 19, 2015 8:17 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] 5 x 2 x 3 = 30 MHz
Hi
There are an enormous number of variations on the basic SC trap. Most of what
Good afternoon,
It comes as no big surprise that ultrastable oscillators has
double-isolation both on thermal and power-supply sides. Both being
important environmental noise injection paths for any oscillator, moving
the operating points of transistors about.
Long-term systematics is
Yes, all about experience , Ulrich
In a message dated 7/19/2015 9:46:17 A.M. Eastern Daylight Time,
kb...@n1k.org writes:
Hi
There are an enormous number of variations on the basic SC trap. Most of
what drives one to be “best” is the component selection process. If a
coil above
X uh
Good morning,
That is too close for my taste. For long term stability, 1 Hz and less the
transistor has more influence then considered . It is a pity that this
group does not address this topic.More to come. I am supervising a PhD
dissertation and it became clear that that is an issue
-nuts@febo.com
Subject: Re: [time-nuts] 5 x 2 x 3 = 30 MHz
Hi
The basic space grade crystal is in the $400 to $1000 range (depends on
quantity). After they
do the 10:1 sort, the resulting ones are (effectively) $4K to $10K each. The
cost just goes
up from there.If you count in the labor
Good morning,
the AT Cut is inherently noisier then the SC cut but the SC has some
spurious resonances modes. Measurements below 1 Hz are very tricky as the
oscillator must be (more or less) insulated from hum, infrared (heater) . Here
I
am still struggling .
Ulrich N1UL
In a
I am working with this .. amazing device, Ulrich N1UL ___
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Ulrich,
Nice picture. What are you doing with the crystal? I have several older
crystals that are nice but have never done anything with them.
Regards
Paul
WB8TSL
On Thu, Jul 16, 2015 at 6:02 PM, KA2WEU--- via time-nuts time-nuts@febo.com
wrote:
I am working with this .. amazing device,
He doesn't mention that that crystal is used in New Horizons:
http://www.bliley.com/products/crystals-precision-standard/vacuum-sealed/
Nice. I have a similar crystal from Valpey-Fischer, 5 MHz 5th overtone
AT-cut (as opposed to your 3rd overtone SC-cut). I would be interested
in what you
Hi
The basic space grade crystal is in the $400 to $1000 range (depends on
quantity). After they
do the 10:1 sort, the resulting ones are (effectively) $4K to $10K each. The
cost just goes
up from there.If you count in the labor, it probably adds another 30% to the
cost.
If you don’t do the
Looks like an SC cut. Let me know if you have any questions about this.
Jerry N9XR
On Jul 17, 2015 6:35 PM, paul swed paulsw...@gmail.com wrote:
Ulrich,
Nice picture. What are you doing with the crystal? I have several older
crystals that are nice but have never done anything with them.
I an curious to know the price of this crystal.
Luciano
On Fri 17/07/15 00:02 , KA2WEU--- via time-nuts time-nuts@febo.com wrote:
I am working with this .. amazing device, Ulrich N1UL
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