I. Overview: PDI-3900M the channel agility adjacent channel TV modulator with high reliability vestigial side band filter, the parasitic output inhibition greater than 60dB; quadruple PLL frequency lock, stable and reliable performance; and RF amplification using quality module components, nonlinear distortion; microcomputer CPU control, programmable 101 channels, three LED displays real channels, with the addition of channel indication (PAL-D / K system), and the power and memory function; RF output power level up to 113dBμV, excellent audio and video linearity. Second, the technical parameters: Output frequency range MHz 48-871 (PAL-D / K DS01-DS58, Z01-Z43) continuously adjustable RF output level dBμV 113 (M); spurious output suppression than dB ≥ 60 (RF output when) RF output return loss dB ≥ 13 video modulation% 87.5 (video input level 1Vp-p) video band flatness dB ± 1.2 the differential gain% ≤ 3 Differential Phase ° ≤ 3 video signal-to-noise ratio dB ≥ 60 colors / light time delay difference Δt ns | of Δτ | ≤ 45 images, sound frequency spacing KHz 6500 ± 2 (PAL-D / K); 6000 ± 2 (PAL-D / I) image carrier frequency accuracy Δf KHz ≤ 5 (VHF ); ≤ 10 (UHF) the audio carrier modulated frequency offset KHz the 50 audio total harmonic distortion% ≤ 1 audio signal-to-noise ratio dB ≥ 60 audio Preemphasis μs 50 supply V AC 90 to 264V Ambient temperature ℃ 5-50 Relative Humidity % ≤ 85 work environment atmospheric pressure Kpa 86-106 Dimensions mm 483 * 140 * 45 Weight Kg 1.7 three installed and connected TV modulator using a common international standard 19-inch models, the installation is recommended, under the machine should be set aside an interval, so that the free flow of air at the same time the cabinet should be well grounded. 1, power indicator in front of the name and function of POWER RF OUTPUT LEVEL adjusting knob, so that the output level of system design requirements AUDIO MOD Adjusting the system to adjust the volume VIDEO MOD to get the best video effect CH marked for Channel 2, followed by Name Function VIDEO IN using the video cable is connected to the AUDIO IN video source using the audio cable to connect the RF OUT RF cable to the audio source connected to the multiplexer mixer SOCKET equipped with a power cord to connect power to the cabinet, the use of multiple modulators the ring string installation, the connections are correct, power for more than 10 minutes after the power up, and then adjust the parameters. Note: The use should avoid frequent switching power supply, should be an interval of more than one minute and then boot after every shutdown.