[Test-Equipment] xtal tester

[Howie]

http://www.free-electronic-circuits.com/circuits/xtal-tester.html

----- Original Message ----- 
From: <josepho at shaw.ca>
To: "Discussion of Electronic Test Equipment" 
<test-equipment at mailman.qth.net>
Sent: Sunday, March 17, 2013 4:59 PM
Subject: Re: [Test-Equipment] xtal tester


Than you Bill, for the explanation, I'll see what I have in my boxes of
parts and try to put something together.
73s
Joe VE7LBI

-----Original Message----- 
From: Fuqua, Bill L
Sent: Sunday, March 17, 2013 1:51 PM
To: Discussion of Electronic Test Equipment
Subject: Re: [Test-Equipment] xtal tester

   A simple single transistor oscillator from the handbook where the crystal
is connected between emitter and collector and base is at RF ground.
A tank circuit in the collector tuned to the expected frequency will assure
it oscillates in the proper fundamental or overtone mode. The crystal
should oscillate in series resonance mode. This mode the crystal frequency
is independent of loading capacitance. It is the natural mechanical
resonance of the quartz slab. This type of oscillator was often used in VHF
converters since they operated in overtone mode and the loading
capacitance would vary with the transistor's temperature thus producing
drift.
  73
Bill wa4lav

________________________________________
From: test-equipment-bounces at mailman.qth.net
[test-equipment-bounces at mailman.qth.net] on behalf of josepho at shaw.ca
[josepho at shaw.ca]
Sent: Sunday, March 17, 2013 4:13 PM
To: Discussion of Electronic Test Equipment
Subject: Re: [Test-Equipment] xtal tester

Thank yuo Eric,
I know the frequencies of the crystals, I just want to know if they
oscilate.
73s
Joe VE7LBI

-----Original Message-----
From: eric lemmon
Sent: Sunday, March 17, 2013 12:24 PM
To: 'Discussion of Electronic Test Equipment'
Subject: Re: [Test-Equipment] xtal tester

Keep in mind that a given crystal may oscillate at a frequency quite
different from its intended frequency when operated in a circuit with the
wrong load and drive level.


73, Eric Lemmon WB6FLY



-----Original Message-----
From: test-equipment-bounces at mailman.qth.net
[mailto:test-equipment-bounces at mailman.qth.net] On Behalf Of Mike Manes
Sent: Sunday, March 17, 2013 12:13 PM
To: Discussion of Electronic Test Equipment
Subject: Re: [Test-Equipment] xtal tester

Some grid dip meters can also excite HF xtals simply by plugging it into the
coil socket (FT243 holders seem to fit perfectly).
Not sure how one would connect a counter directly, but tuning in the signal
on a receiver and zero-beating it with a counter-equipped sig gen might
work.
73 de Mike W5VSI

On 3/17/13 12:23 PM, GENE wrote:
> Joe:
>
> I built a neat little tester a year or so ago that I use with my HP
> counter that works like a charm.
>
> I will look later today or tomorrow for the info and get back to you
> then. . . .
>
> Gene,  WØQFC
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