Thread: Crystal VCO
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Old November 26th 05, 02:15 PM posted to rec.radio.amateur.homebrew
Scott
 
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Default Crystal VCO

Wouldn't it be easier to use a frequency counter? If one is not
available, but a general coverage HF receiver or transceiver with a
digital readout is available, you could zero beat the oscillator, note
the reading on the display, cause the oscillator to shift to your other
frequency, zero beat that signal, note the display reading and subtract
to find the difference in frequency.

Scott



Roy Lewallen wrote:
Apparatus wrote:

. . .
I'm at home where I only have an analog tektronix 2213 60MHz scope (no
spectrum analyzer). How can I measure the frequency deviation / pull of
the crystal with the series configuration? Any ideas?



If you have another crystal, build a second oscillator. Run the two into
a mixer followed by a simple lowpass filter, and measure the resulting
difference frequency.

Roy Lewallen, W7EL