Experimenting with a 74ls86 XOR doubler for 5 to 10 Mhz. Typically this would use a 90 degree phase shift to the other gate. The gate acting as a mixer to produce 10 Mhz. The reason to experiment is that I have noticed most of the doubler discussions take a 5 Mhz square wave filter it to a sine wave, feed it to a multiplier scheme and then filter the output. The 7486 method eliminates one of those processes. I have accurate delay lines I can adjust in 2 ns increments (Allen Aviation lump LC). The output is a semi asymmetrical square wave due to some gate timing I need to deal with if possible. Setting the delay taps to 90 degrees produces a 10 MHz output with 5 and 15 Mhz 8-10 db down. Lots of other higher frequency outputs. At this point I have no filtering on the output of the 7486. Purposely mis-adjusting the taps sets either the 5 Mhz or 15 Mhz level higher.
Other noise and such are many DB down 50 plus. Why is this a bad method as compared to our typical time-nuts discussions? Regards Paul WB8TSL _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
