Frequency selection system having gang switched crystal oscillators

Claim 1

A CRYSTAL REFERENCE SYSTEM COMPRISING: A LOCAL OSCILLATOR, THE FREQUENCY OF WHICH IS TO BE CONTROLLED; A HARMONIC GENERATOR; BALANCED MIXER MEANS CONNECTED TO SAID LOCAL OSCILLATOR AND HARMONIC GENERATOR FOR HETERODYNING THE OUTPUTS THEREOF; A CRYSTAL INTERPOLATION OSCILLATOR HAVING INPUT AND OUTPUT ELECTRODES; A PLURALITY OF CRYSTALS CONNECTED TO SAID INTERPOLATION OSCILLATOR INPUT ELECTRODE; A MULTI-POSITION SWITCH HAVING DRUM ROTOR; A PLURALITY OF SPURS PROGRESSSIVELY SPACED AXIALLY AND CIRCIMFERENTIALLY ALONG SAID DRUM ROTOR, A PLURALITY OF PAIRS OF SINGLE-POLE SINGLE-THROW SWITCHES MOUNTED ON OPPOSITE SIDES OF SAID ROTOR SO THAT EACH SPUR FIRST CLOSES ONE SWITCH OF ITS OSSOCIATED PAIR AND THEN AFTER A 180* ROTATION CONTACTS THE OTHER SWITCH OF THAT PAIR; MEANS TO CONNECT ONE TERMINAL OF EACH OF SAID PLURALITY OF SWITCHES TO SAID INTERPOLATION OSCILLATOR OUTPUT ELECTRODE, THE SECOND TEMINAL OF EACH OF SAID PLURALITY OF SWITCHES BEING RESPECTIVELY CONNECTED TO SAID PLURALITY OF CRYSTALS; A SECOND MIXER, THE INPUTS OF WHICH ARE CONNECTED FTO THE OUTPUTS OF SAID BALANCED MIXER AN SAID INTERPOLATION OSCILLATOR; A PHASE DISCRIMINATOR; A CRYSTAL REFERENCE OSCILLATOR HAVING INPUT AND OUTPUT ELECTRODES; FIRST AND SECOND CRYSTALS CONNECTED TO SAID REFERENCE OSCILLATOR INPUT ELECTRODE; A TWO POSITION SWITCH HAVING A STAR RACEWAY CONNECTED TO ONE END OF SAID DRUM ROTOR, A PAIR OF VERTICALLY DISPOSED RODS, A VERTICALLY MOVABLE MEMBER WHICH RIDES ON SAID RODS ADJACENT SAID STAR RACEWAY, A PILOT PIN ON ONE SIDE OF SAID VERTICALLY MOVABLE MEMBER FOR ENGAGEMENT IN SAID STAR RACEWAY, A PAIR OF FIXED CONTACTS LOCATED ADJACENT SAID VERTICALLY MOVABLE MEMBER ON THE SIDE THEREOF OPPOSITE SAID STAR RACEWAY, AND TWO MOVABLE CONTACTS AFFIXED TO SAID VERTICALLY MOVING MEMBER AND LOCATED BETWEEN SAID PAIR OF FIXED CONTACTS; MEANS TO CONNECT ONE PAIR OF SAID FIXED OR MOVABLE CONTACTS TO SAID REFERENCE OSCILLATOR OUTPUT ELECTRODE; THE OTHER PAIR OF SAID FIXED OR MOVABLE CONTACTS BEING RESPECTIVELY CONNECTED TO SAID TWO CRYSTALS; THE OUTPUTS OF SAID REFERENCE OSCILLATOR AND SAID SECOND MIXER BEING CONNECTED TO SAID PHASE DISCRIMINATOR; AND MEANS TO CONNECT THE OUTPUT OF SAID PHASE DISCRIMINATOR TO SAID LOCAL OSCILLATOR.