In message [EMAIL PROTECTED], Magnus Danielson writ
es:
Sony professional Studio Monitors cut back on the range to improve
picture quality, and won't do much more than the 810Hz...
That is actually _not_ to improve the picture quality on the studio
monitor, but to improve it the end product
In a message dated 7/4/2006 09:52:33 Pacific Daylight Time, [EMAIL PROTECTED]
writes:
Hello,
Please excuse the fact that this is not what we all consider precise
frequency. I am selecting crystals to use for a medium to high volume
application.
The basic criterion are:
- used with a
At 02:48 AM 7/5/2006, [EMAIL PROTECTED] wrote:
In a message dated 7/4/2006 09:52:33 Pacific Daylight Time, [EMAIL PROTECTED]
writes:
Hello,
Please excuse the fact that this is not what we all consider precise
frequency. I am selecting crystals to use for a medium to high volume
application.
von Stan Searing
Gesendet: Dienstag, 4. Juli 2006 18:53
An: 'Discussion of precise time and frequency measurement'
Betreff: [time-nuts] questions on uncompensated crystal oscillators
Hello,
Please excuse the fact that this is not what we all
consider precise frequency. I am selecting
In a message dated 7/5/2006 08:30:44 Pacific Daylight Time,
[EMAIL PROTECTED] writes:
I would agree with you Said, 10ppm is a lot to ask and let's be
honest, production trimming is not so difficult these days. Without
going to 10ppm you can get your crystal manufacturer to group your
From: [EMAIL PROTECTED]
Subject: Re: [time-nuts] questions on uncompensated crystal oscillators
Date: Wed, 5 Jul 2006 14:12:48 EDT
Message-ID: [EMAIL PROTECTED]
Hi John,
Hi,
great idea to compensate for temperature using the varicaps in a
free-running system.
Recall that AT-cut crystals
As I recall there is a hysteresis effect on the frequency vs. temperature
curve that needs to be compensated for as well. - Mike
Mike B. Feher, N4FS
89 Arnold Blvd.
Howell, NJ, 07731
732-886-5960
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From: [EMAIL PROTECTED]
Subject: Re: [time-nuts] questions on uncompensated crystal oscillators
Date: Wed, 5 Jul 2006 15:25:46 EDT
Message-ID: [EMAIL PROTECTED]
Hi Magnus,
Hi Said,
the trick is to get away without any compensation if possible, since the
Varicap diodes, temp sensor etc all
Even if you get the crystal adjusted at the factory to say 5ppm, can
it be guaranteed that all the other effects combined stay at 45ppm
over the lifetime of the product (these days it's about 6-12 months
depending on the warranty period)?
After initial calibration, the main consideration
In a message dated 7/5/2006 13:00:41 Pacific Daylight Time,
[EMAIL PROTECTED] writes:
Yes, it is hard.
PAL is 4433618.75 +/- 5 Hz or +/- 1.12 ppm.
NTSC is 3579545 +/- 10 Hz or +/- 2.79 ppm.
That is straight out of ITU-R Rec. BT.470-6.
The MPEG transport stream is clocked at 2700 +/-
From: [EMAIL PROTECTED]
Subject: Re: [time-nuts] questions on uncompensated crystal oscillators
Date: Wed, 5 Jul 2006 16:51:43 EDT
Message-ID: [EMAIL PROTECTED]
Hi Magnus,
Hi Said,
yup, that +-810Hz is the number I had in mind on the receiver side. The
tighter 3ppm numbers you mentioned
Hello,
Please excuse the fact that this is not what we all consider precise
frequency. I am selecting crystals to use for a medium to high volume
application.
The basic criterion are:
- used with a VLSI inverter based oscillator with
3.3 V supply, but somewhat high impedance output.
-
The basic criterion are:
- used with a VLSI inverter based oscillator with
3.3 V supply, but somewhat high impedance output.
An inverter is not specified for oscillator duty.
It cannot be analyzed for this application on SPICE.
It will never be a high precision oscillator circuit.
(10
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