550MHz Professional Agile Modulator Introduction It is one practical and economical modulator manufactured by our company. Equipped with double frequency conversion LNB, CPU control technology, and easy to change RF output frequency by 0.25MHz stepping frequency, it is the first choice emergency standby equipment for medium and small sized TV system. Features Double digital PLL, CPU control. Output RF modulation frequency is adjustable in the range of 48~550MHz. Preset standard channels enable to select any channel at discretion. Audio carrier 4.5/5.5/6.0/6.5MHz is selectable on panel. Every channel carrier can be trimmed by 0.25MHz. Automatic storage, memory after power off. Specifications Item Unit Specifications RF Output Frequency MHz 45~550 Max Output Level dB 115 RF Output Range dB 13~20 V/A Ratio dB 20 Broadband Noise dB 60 Frequency Stability KHz ? Output Impedance Ω 75 Output Return Loss dB 16 Video Mod Depth % 87.5~90 Video Input Level for 87.5% Vp-p 1 Input Impedance Ω 75 Differential Gain % ≤5 Differential Phase ?≤5 C/L Delay ns 45 Frequency Response dB ?.0 Video S/N dB 60 Audio Input Level Vp-p 0.4 Input Impedance Ω 600 Distortion Factor % 0.6 V/A Spacing MHz 4.5, 5.5, 6.0, 6.5 Deviation dB ?.5 Pre-emphasis usec 50 General Power Supply V/A 180~250 Fuse A -20~0.5 Temperature Range ℃ 0~40 Dimensions cm 48.3?1?.5