Hi
Drop in frequency = mass increase. Mass is moving on to the crystal as time
goes on.
Since the package (hopefully) is sealed, there are a fairly limited number of
ways to do that.
1) The case of the crystal was more dirty than the blank when things were
sealed, equilibrium is to move to
Garland' 4cx2...@muohio.edu
Sent: Monday, February 14, 2011 3:26 AM
Subject: [time-nuts] Why do crystals go bad?
Group,
Jim Garland on the boatanch...@theporch.com list asked about crystals:
A 22.5MHz crystal (HC-5 case) in my homebrew receiver, built about forty
years ago, no longer oscillates
Hi
From a number of radios I've torn crystals out of and looked at:
1) The blank is broken / cracked. Most likely the radio got dropped somewhere
along the line. Just like that stone hit on your windshield (on two cars at the
moment), the crack can start small and propagate. Time from impact
Very interesting Bob Thanks.
It brings to mind an annoying issue I run into from time to time.
VCXO 12.8 Mhz used as a reference in communications gear. Most of the gear is
roughly 10 years old and of similar make, both mobile and portable styles.
They all are dropping in operating
And sorry about the typos! Still getting used to this touch screen!
Sent from my iPhone
On Feb 14, 2011, at 19:47, Shawn Tayler sh...@xmtservices.net wrote:
Very interesting Bob Thanks.
It brings to mind an annoying issue I run into from time to time.
VCXO 12.8 Mhz used as a reference
On Mon, Feb 14, 2011 at 7:47 PM, Shawn Tayler sh...@xmtservices.net wrote:
My question is what is the process in the aging if the crystals that causes
this drop in frequency? I understand it may be mechanical but the level if
vibration the radios are exposed to varies greatly and there does
On 2/14/11 7:47 PM, Shawn Tayler wrote:
Very interesting Bob Thanks.
It brings to mind an annoying issue I run into from time to time.
VCXO 12.8 Mhz used as a reference in communications gear. Most of the gear is
roughly 10 years old and of similar make, both mobile and portable styles.
Group,
Jim Garland on the boatanch...@theporch.com list asked about crystals:
A 22.5MHz crystal (HC-5 case) in my homebrew receiver, built about forty
years ago, no longer oscillates. It seems to be purely an age-related
problem.
It is in a standard solid state circuit which bandswitches six
Two authors come to mind regarding crystal oscillators: Eric Vittoz and
Marvin Ferking. Eric Vittoz is the more modern of the two. His writings
tend towards long term stability of crystal oscillators. Basically, most
designs put too much energy into the crystal, which he claims wears it
out.
On 14/02/11 04:26, Bill Hawkins wrote:
Group,
Jim Garland on the boatanch...@theporch.com list asked about crystals:
A 22.5MHz crystal (HC-5 case) in my homebrew receiver, built about forty
years ago, no longer oscillates. It seems to be purely an age-related
problem.
It is in a standard solid
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