6 GHz PLL brick oscillator by Fairchild Microwave, model MS-540XO--the higher power version. Contains an adjustable high-Q cavity oscillator that is phase locked to a harmonic of the internal reference crystal oscillator. For the pics, I have inserted a 101.33333 MHz XTAL, the X12 harmonic is 1216 MHz to which the cavity oscillator is phase locked ( X12 the crystal reference), and the multiplier block is X5 giving 6080 MHz output at the TNC female connector.
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