4 - Precision OCXO Xtal Crystal Oscillator 3.000 MHz Only what is listed above and/or shown in the pictures below are included in this auction. This auction is for a lot of two oscillator units that each contain two precision 3 MHz oscillators. These were frequency generators removed from Nortel cell site equipment. The oscillators are very nice ovenized units. There are various model numbers on different units consisting of Isotemp OCXO127-10, EROS-800-M45, and McCoy MC839X4-001. The oscillator unit itself measures 2.375" x 2.75" x 1.75"H and has an adjustment port on one side. The pinout of the oscillator is +27V (assumed to be for the oven, +24 would probably work as well), +15V (for the oscillator, GND, and output (also with GND pin). The module has two +27 volt power connections, one for each oscillator section. The output is via the RCA jack on the board (one for each section). There is a 10-pin connector for status but we do not have the pin out. There is an output level adjustment for each oscillator (near the power connector). Output is a sine wave and can be varied from 0-9V p-p. Great units for building timing projects, divide by 3 gets you to 1MHz. Total weight of the lot is about 4.5 pounds