In article ,
says...
Hi

need a low-noise xtal oscillator using 14.7 or 15.7MHz rubber xtals in
series mode circuit to sweep xtal filters with good as possible noise
distance. The available xtals are believed to pull +/-10kHz or more.

Any suggestions.

Use a DDS hooked up to your PC's parallel port?

-- jm

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http://www.qsl.net/ke5fx
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J M Noeding wrote:

Hi

need a low-noise xtal oscillator using 14.7 or 15.7MHz rubber xtals in
series mode circuit to sweep xtal filters with good as possible noise
distance. The available xtals are believed to pull +/-10kHz or more.

Any suggestions.

73
Jan-Martin, LA8AK
http://home.online.no/~la8ak/c.htm
---
J. M. Noeding, LA8AK, N-4623 Kristiansand
http://home.online.no/~la8ak/c.htm

This is a fairly standard circuit -- why not just look in an ARRL manual
or one of the many QRP transmitter designs for an oscillator? You can
check for phase noise by mixing it with a good (fixed) crystal
oscillator, or you can just trust it.

--

Tim Wescott
Wescott Design Services
http://www.wescottdesign.com

Why do you need such such good phase noise?
An average oscillator will be good enough to measure to -70 dBc or so.
You could use a DDS with a crystal clock - this will have good close in
phase noise (neasrly as good as the clock), though coherent spurs might
be a problem.

Richard


J M Noeding wrote:
Hi

need a low-noise xtal oscillator using 14.7 or 15.7MHz rubber xtals in
series mode circuit to sweep xtal filters with good as possible noise
distance. The available xtals are believed to pull +/-10kHz or more.

Any suggestions.

73
Jan-Martin, LA8AK
http://home.online.no/~la8ak/c.htm
---
J. M. Noeding, LA8AK, N-4623 Kristiansand
http://home.online.no/~la8ak/c.htm