500 kHz VFO ?
andre.kesteloot at verizon.net
Tue Jan 3 10:37:02 CST 2006
Just as an experiment, I decided to assemble the permeability tuned
Vackar VFO kit offered by WA6OTP
For about $21 (incl. postage), you receive all the parts. If enclosed in
a metal box (not included), and kept at fairly constant temperature, the
oscillator --after an overnight warming up period-- drifts less than +
and - 25 Hz at 7.500 MHz. (as measured on my HP 5245L counter).
If it were to be re - dimensioned for 5 MHz (or 10 MHz), and followed by
a divider by 10 (or 20), we should be able to expect a stability of
about + and - 2.5 Hz at 500 KHz.
Because the output is only about 0.3 volt RMS, the only thing that would
need be added to the kit is a X10 amplifier to drive the CMOS divider IC.
Not bad for $21 :-)
More information about the Tacos