A good SAW oscillator will do 500 mHz. with the same performance as a crystal
oscillator.
Jim Miller <[EMAIL PROTECTED]> wrote:
I was looking last night at Harold Johnson's paper on the EMRFD CD that
described his 105Mhz VFO based on a helical resonator. From his summary:
"Measured noise sidebands with a divisor of 8 (Each synchronous division by
a factor of two provides close to a 6 dB improvement in phase noise) are
better than -123 dBc/Hz at 1 kHz and drop to -144 dBc/Hz at 5 kHz. At 20 kHz
spacing with divide by 8, those numbers measure -156 dBc/Hz and at 50 kHz
they exceed my ability to measure them. (-162 dBc/Hz to -165 dBc/Hz
depending on how I hold my tongue in my cheek on that particular day.) This
is better at ONE kHz spacing from the carrier than a current commercial
offering recently reviewed in one of our periodicals was at ANY spacing."
His oscillator was then used in an analog PLL by Bill Carver (not
described).
I'm starting to work through the numbers to see what a version at 400 -
500Mhz would look like. It could be Huff and Puffed against a crystal for
thermal stability.
For one...it gets tinier and probably more difficult to implement! Anyone
seen this done?
jim
ab3cv
----- Original Message -----
From: "Edson Pereira"
To:
Sent: Saturday, April 15, 2006 8:50 PM
Subject: [soft_radio] Re: SDR Basics
Do you know of a good source for a 500 MHz low jitter clock
oscillator?
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