Comb Generators Series 900 Series 95 Combline Spacing 1 to 1000 MHz Commercial -- Military Features ■ Built-in-Test (BIT) ■ Jammers ■ Phase Locked Loops ■ Lower Cost ■ Modulation Option Spectrum Microwave Series 95 Comb Generators use a Step Recovery Diode (SRD) to generate very narrow voltage spikes; these in turn produce an output frequency spectrum rich in harmonics. The spacing between the signals is equal to the source that drives the SRD, which in most cases is a stable crystal oscillator. Examples of the spectrum for a number of comb generators are included on the reverse side of this fact sheet. The crystal oscillator is normally internal; however, an external signal can be used to drive the SRD. If only certain combline signals are required for a particular application, a filter tuned to the desired combline must be used. Comb Generators have several applications. They are commonly used as Built-in-Test (BIT) oscillators to calibrate receivers; other uses are in Phase Locked Loops (PLL), Jammers, Antenna Testing, Linearizing Voltage Controlled Oscillators, etc. Spectrum Microwave, Inc. www.SpectrumMicrowave.com 2707 Black Lake Place Phila, Pa. 19154 PH: 215-464-4000 FAX: 215-464-4001 Comb Generators SERIES 95 Series 900 SPECIFICATIONS Comb Spacing .......................................................... 1 to 1000 MHz Output Spectrum ................................................ See plots (Typical) Frequency Stability ................................................... +1 to +30 ppm Temperature ...................................... (0 to +50 ºC) to (-55 to +85 ºC) Input Voltage ..................................................................... +15 VDC Connectors ................................................................ RF-SMA Jack DC Input .............................................. Solder Type Filter Capacitors SERIES 95 SPECTRUM ENVELOPES Spectrum Microwave, Inc. www.SpectrumMicrowave.com 2707 Black Lake Place Phila, Pa. 19154 PH: 215-464-4000 FAX: 215-464-4001