In a message dated 1/13/2008 10:58:10 Pacific Standard Time, [EMAIL PROTECTED] writes:
>The oscillator has obviously jumped to the so-called B-mode of the >SC-cut crystal. The C-Mode operation (3rd overtone) is enforced by a >circuit consisting of two inductors and two capacitors which is Hi Philip, Bernd, happy new year! I agree with Bernd completely, there are two tank circuits, one that keeps the crystal at third overtone (L2 with DC-blocker C5), and one that prevents operation at 10.75MHz (C6 and L3) C6 with L3 compose the 10.75MHz tank which is supposed to prevent B Mode operation by loading down the crystal at that frequency. One of those two components is very likely damaged. Try replacing them with high-temp, high accuracy components. Try to get components with as high a Q as possible. If L2 is broken, then the circuit would oscillate at about 3.5MHz. bye, Said **************Start the year off right. Easy ways to stay in shape. http://body.aol.com/fitness/winter-exercise?NCID=aolcmp00300000002489 _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
