I've had several discussions with Chris Bartram about this and similar
VHF oscillators.
My understanding is that Chris' variant of this particular Driscoll osc.
has been designed specifically for low close-in phase noise, and that is
why the phase-shift network has a low-pass response (to try
Grant Hodgson wrote:
I've had several discussions with Chris Bartram about this and similar
VHF oscillators.
My understanding is that Chris' variant of this particular Driscoll
osc. has been designed specifically for low close-in phase noise, and
that is why the phase-shift network has a
My understanding is that Chris' variant of this particular Driscoll osc.
has been designed specifically for low close-in phase noise, and that is
why the phase-shift network has a low-pass response (to try and reduce
flicker noise) rather than the more common high-pass network.
The
- Original Nachricht
Von: Bruce Griffiths bruce.griffi...@xtra.co.nz
An: Discussion of precise time and frequency measurement
time-nuts@febo.com
Datum: 28.12.2009 06:52
An inductor in series with the 220 ohm emitter resistor will improve the
phase noise floor.
In
dk...@arcor.de wrote:
- Original Nachricht
Von: Bruce Griffithsbruce.griffi...@xtra.co.nz
An: Discussion of precise time and frequency
measurementtime-nuts@febo.com
Datum: 28.12.2009 06:52
An inductor in series with the 220 ohm emitter resistor will improve the
Interesting read on a low phase noise oscillator by Chris Bartram GW4DGU
http://www.christopherbartramrfdesign.com/blaenffos/oscillator/VLNO.pdf
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Tom Clifton wrote:
Interesting read on a low phase noise oscillator by Chris Bartram GW4DGU
http://www.christopherbartramrfdesign.com/blaenffos/oscillator/VLNO.pdf
There are several VHF crystal Oscillators designed by M Driscoll.
The one shown is merely derived from one variant.
It has
Hi
The feedback network in the Fig 7 schematic makes a lot more sense than the
network in the first Fig 7
Bob
On Dec 27, 2009, at 7:19 PM, Tom Clifton wrote:
Interesting read on a low phase noise oscillator by Chris Bartram GW4DGU
An inductor in series with the 220 ohm emitter resistor will improve the
phase noise floor.
The MMIC output amplifier has a wider bandwidth than necessary and
doesn't have a particularly high reverse isolation.
One could improve this by substituting a CB cascade or other discrete
amplifier
