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SB-55-SF Analog 55dBmV SAW Filtered CATV Modulator Available In Channels 2-134

Specifications and Documentation

The SB-55SF / PDI-55-SF is a fixed channel, PLL controlled, video and audio modulator with SAW filtering. It is available for any cable channel between 2 through 134. Its video dynamic range insures 87.5% modulation depth over a wide video input range. The vestigial sideband selectivity allows maintenance free adjacent channel configuration. An efficient power supply enables cool and stable operation. The unit offers high performance, low cost and compact design.


• +55dBmV RF output level 
• Phase lock loop frequency control 
• SAW filtering for true adjacent channel operation 
• BTSC composite baseband stereo compatible 
• Spurious output -60dBc 
• Auxiliary AC outlet 
• Cool operation 
• Available In All PAL Configurations 
• UL Listed Canada/U.S


• Frequency Range Channels 2-134 (54-860MHz) 
• Video Input Level 0.7 to 1.5 Vp-p for 87.5% modulation 
• Video C/N 60dB (4MHz BW) 
• Output Level +55dBmV (±2dBmV audio RF level is adjustable from 13-20dB below video carrier) 
• Frequency Stability ±5kHz Maximum 
• Hum and Noise -60dB min. @ 87.5% modulation 
• Audio Input Level 250mV min. for ±25kHz deviation 
• Audio Input Impedance 600 ohms or High Z, unbalanced 
• Spurious Output -60dBc typical (@ A/V ratio-15dB) 
• Power Requirement 117 V AC, 60Hz 15 Watts 
• Dimensions 19” W x 1 3/4” H x 6 1/2” D


• Frequency Response 20Hz to 14kHz + 1dB 
• Separation 27dB 20Hz to 14kHz Typical 
• Pilot Rejection 50dB 
• Signal to Noise Ratio 60dB 
• Audio Input Impedance 10K ohms unbalanced 
• Nominal Input Level (APL) 0dBm, Adjustable + 10dB 
• Distortion 0.5% Maximum THD

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