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PDI-50121CM SAW Filtered Fixed Channel 12 in 1 Mini Modulator For Channels 2 - 134PDI-50121CM SAW Filtered Fixed Channel 12 in 1 Mini Modulator For Channels 2 - 134PDI-50121CM SAW Filtered Fixed Channel 12 in 1 Mini Modulator For Channels 2 - 134

Specifications and Documentation


The PDI-50121CM is a space saving, fixed channel modulator system. It consists of 12 individual, vertically mounted, fixed frequency modulators and an efficient switching type power supply module mounted in one 3-1/2” high housing. It is designed for 19” rack mounting. Each modulator is SAW filtered and is factory set to the desired channel and proper offset. Precise frequency is maintained with PLL circuitry. Recessed front panel controls are preset, at the factory, for 87.5% depth of modulation, ±25kHz audio deviation, and -15dBc video audio ratio. RF is set at maximum. It offers excellent video performance and high reliability in a 2U rack. Now available with internal stereo so that a separate module is no longer needed!


• +45dBmV output with very low spurious response
• Precise frequency control with PLL circuitry
• Easy setup
• SAW filtering for true adjacent channel operation
• Heavy duty cast housing
• With optional internal stereo
• Available in all PAL configurations
• Compatible with all competitors 12 in 1 modulator systems
• UL listed Canada/U.S.


Frequency Range Channel 2-134 (54 to 860MHz) 
Channels VHF, CATV (STD) 
Output Level +45dBmV 
Output Impedance 75 ohms 
Audio/Video Ratio Adjustable -12 to -20dBc 
Frequency Stability ±5kHz 
Spurious Outputs >-60dBc (A/V ratio at -15dBc) 
Out of Band Noise -90dBc 
In Band C/N Ratio >60dB


Input Level 0.8 to 1.2 Vp-p for 87.5% modulation
Frequency Response <+ 1.5dB (30Hz to 4.2 MHz)
Differential Phase <+3 degrees
Differential Gain + 4%
Chroma/Luminance Delay Meets FCC group delay requirement


Input Level 250mV minimum for 25kHz deviation 
Input Impedance 20 Kohms unbalanced 
Frequency Response ±1.0dB, (50Hz-15KHz) 
Pre-emphasis 75 microseconds 
Frequency Stability ±5kHz minimum (±3kHz typical) 
Out of Band Noise -90dBc 
Internal Stereo optional


AC Line and Power 90-260Vac, 50.6 Hz
Operating Temperature -10°C to + 50°C
Dimensions 19"L x 9.5"W x 3.5"H
Weight 1.8 Lbs


Video Input "F"
RF Output "F"
Audio Input "RCA"

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