On 2 Sep 2004 10:10:33 -0700, (Mike Monett) wrote:

Hi Paul,

Actually, I didn't write that. Those were excerpts from various
sites that discussed the pros and cons of inverted mesa crystals.


[excellent references snipped]

Thanks, Mike. That lot ought to keep me quiet for a while!

p.


--

"What is now proved was once only imagin'd." - William Blake, 1793.

Generally speaking. it is the part of the blank which is directly under the
electrodes, and very near to the edges of the electrodes, that determine the
frequency. I was close to some 135 MHz crystal filter some years ago, but
wasn not aware of the technology useed -- it wasn't used in the final
design.
--
Steve N, K,9;d, c. i My email has no u's.

Paul Burridge wrote:

[excellent references snipped]

Thanks, Mike. That lot ought to keep me quiet for a while!

p.

Now, watch you don't get too smart! I enjoy the discussions you raise and
usually end up learning something - which is more than I can say for some
of the self-appointed experts in other newsgroups

Best Wishes,

Mike Monett

On 1 Sep 2004 09:59:49 -0700 (Tom Bruhns) wrote:

Suggestion: just get a 100MHz TTL oscillator. I believe Harold
offered you one last time you posted about 100MHz xtals a couple years
ago. ECL won't have 2.5V output, but I could supply you with a nice
little PECL 100MHz VCXO that you could easily trim to "exactly"
100MHz. It will deliver about 800mV p-p into 50 ohms.

What is PECL?

What kind of stability and aging could I expect from this oscillator?

-
-----------------------------------------------
Jim Adney
Madison, WI 53711 USA
-----------------------------------------------

"Jim Adney" wrote in message
...
On 1 Sep 2004 09:59:49 -0700 (Tom Bruhns) wrote:

Suggestion: just get a 100MHz TTL oscillator. I believe Harold
offered you one last time you posted about 100MHz xtals a couple years
ago. ECL won't have 2.5V output, but I could supply you with a nice
little PECL 100MHz VCXO that you could easily trim to "exactly"
100MHz. It will deliver about 800mV p-p into 50 ohms.

What is PECL?

Plessey emitter-coupled logic, like MECL, which is made by Motorola.

Leon

From: "Leon Heller"
Newsgroups: rec.radio.amateur.homebrew
References:


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"Jim Adney" wrote in message
.. .
On 1 Sep 2004 09:59:49 -0700 (Tom Bruhns) wrote:

Suggestion: just get a 100MHz TTL oscillator. I believe Harold
offered you one last time you posted about 100MHz xtals a couple years
ago. ECL won't have 2.5V output, but I could supply you with a nice
little PECL 100MHz VCXO that you could easily trim to "exactly"
100MHz. It will deliver about 800mV p-p into 50 ohms.

What is PECL?

Plessey emitter-coupled logic, like MECL, which is made by Motorola.

Leon




PECL is ECL run from a positive supply. ECL is normally run from a negative
supply respect to ground. So, they have the sme swings, but different "bias"
levels.

Jure Z.

PECL = positive-supply ECL. It's set up to run from a +5V supply
(with the metal case grounded), instead of the usual -5.2V for ECL.
Has nothing to do with Plessey.

I believe it's spec'd +/-20ppm total from -40C to +85C. It uses a
standard AT-cut crystal, I believe, so one could find a zero-slope
operating temperature and it'd be quite stable.

Cheers,
Tom



Jim Adney wrote in message . ..
On 1 Sep 2004 09:59:49 -0700 (Tom Bruhns) wrote:

Suggestion: just get a 100MHz TTL oscillator. I believe Harold
offered you one last time you posted about 100MHz xtals a couple years
ago. ECL won't have 2.5V output, but I could supply you with a nice
little PECL 100MHz VCXO that you could easily trim to "exactly"
100MHz. It will deliver about 800mV p-p into 50 ohms.

What is PECL?

What kind of stability and aging could I expect from this oscillator?

-
-----------------------------------------------
Jim Adney
Madison, WI 53711 USA
-----------------------------------------------

"Tom Bruhns" wrote in message
m...
PECL = positive-supply ECL. It's set up to run from a +5V supply
(with the metal case grounded), instead of the usual -5.2V for ECL.
Has nothing to do with Plessey.

Yes, you are correct. Plessey used to make it. Please excuse my confusion.

Leon