Hello Jim,

That is total and absolute bullpuckey.



Huh? See the 2nd paragraph (mode):

http://www.euroquartz.co.uk/tech-xtal.htm

Regards, Joerg

http://www.analogconsultants.com

Rich Grise wrote:
On Mon, 28 Feb 2005 12:07:49 -0800, Tim Wescott wrote:

IIRC Digi-Key has 100MHz crystals, but I may be remembering 100MHz
oscillators. YMMV. IDNKWTFIAS. Caviat Emptor (so _that's_ what CE

----------

means! Here I thought it was a quality mark). Etc.


I Do Not Know WTF I Am Saying?

Thanks,
Rich


OK, silly I know, but I cant figure out YMMV...

OTOH, WTF, IAAR

Cheers
Terry

RST Engineering wrote:
That is total and absolute bullpuckey.

Jim



---
You can use a fundamental mode crystal as an overtone oscillator, but
even if you can get it to oscillate, it won't be generating an
overtone at 100MHz, since overtone modes of oscillation aren't
harmonically related to the fundamental.

sorry dude, 50 years of IEEE UFFC papers suggest *you* are wrong. I was
surprised when I learned this too.

Cheers
Terry

Terry Given wrote:

OK, silly I know, but I cant figure out YMMV...

Your Mileage May Vary


--
Beware of those who post from srvinet.com!

Michael A. Terrell
Central Florida

I read in sci.electronics.design that Terry Given
wrote (in ) about 'Using non-
overtone crystal in overtone mode?', on Tue, 1 Mar 2005:

OK, silly I know, but I cant figure out YMMV...

Year 2005. (;-)
--
Regards, John Woodgate, OOO - Own Opinions Only.
The good news is that nothing is compulsory.
The bad news is that everything is prohibited.
http://www.jmwa.demon.co.uk Also see http://www.isce.org.uk

I read in sci.electronics.design that douglas dwyer
wrote (in )
about 'Using non-overtone crystal in overtone mode?', on Mon, 28 Feb
2005:
Overtone crystals are mechanical resonators and the overtone shear mode
which has additional shear planes within the volume wont occupy exactly
the same volume as the fundamental so the frequency will not be exactly
3X or 5X the fundamental but approx 2000ppm high or low?

I remember being told by a crystal 'expert' that with some cuts the
difference can be much larger than that. Is that so?
--
Regards, John Woodgate, OOO - Own Opinions Only.
The good news is that nothing is compulsory.
The bad news is that everything is prohibited.
http://www.jmwa.demon.co.uk Also see http://www.isce.org.uk

Depending on whether the circuit is designed for overtone oscillation or
harmonic generation, how perfect the overtone crystals are, and how the
circuit is tuned, I'd expect either:
1) No oscillation
2) Very close to 100.1 MHz
3) Very close to 100.3 MHz

What did you experience?

Joe
W3JDR


"Asimov" wrote in message
...
"John Fields" bravely wrote to "All" (28 Feb 05 14:34:30)
--- on the heady topic of " Using non-overtone crystal in overtone
mode?"

JF From: John Fields
JF sci.electronics.components:12029 rec.radio.amateur.homebrew:8635

JF Check out "Chladni patterns" if you're interested.

I've done some putzing with crystals. What frequency say would a
100.3MHz xtal in series with a 100.1Mhz xtal settle on? 100.2Hz?

A*s*i*m*o*v

... It's kind of fun to do the impossible... -Walt Disney

John Woodgate wrote:
OK, silly I know, but I cant figure out YMMV...
Year 2005. (;-)

Honestly John! That should be AMMV.

I read in sci.electronics.design that Paul Burke wrote
(in ) about 'Using non-overtone crystal
in overtone mode?', on Tue, 1 Mar 2005:
John Woodgate wrote:
OK, silly I know, but I cant figure out YMMV...
Year 2005. (;-)

Honestly John! That should be AMMV.

The promulgation of a 'horrible hybrid' is justified in pursuit of a
whimsical coincidence.
--
Regards, John Woodgate, OOO - Own Opinions Only.
The good news is that nothing is compulsory.
The bad news is that everything is prohibited.
http://www.jmwa.demon.co.uk Also see http://www.isce.org.uk

On Mon, 28 Feb 2005 18:33:53 -0800, "RST Engineering"
wrote:

That is total and absolute bullpuckey.

Jim


---
You can use a fundamental mode crystal as an overtone oscillator, but
even if you can get it to oscillate, it won't be generating an
overtone at 100MHz, since overtone modes of oscillation aren't
harmonically related to the fundamental.

---
RST what???

--
John Fields