C78D Full Range Agile Tunable Modulator User's Manual Model C78D
Model C78D Features Reliable,durable & easy to operate Superior spurious harmonic output 45.00-870.00MHz(90MHz) IC bus-mastering GaAs Component used Specification RF Frequency range 45.00MHz to 870.00MHz Frequency stability 5KHz Agile stepping 50KHz Output level 113dB V max Level adjustable range 0dB Output Impedance 75 Spurious Output -6dB Output return loss 14dB C/N in band 70dB min 65dB out-of-band 65dB min 6dB) IF IF/picture output frequency: 38.00MHz IF/pucture output level: 85dB V Aural IF frequency 31.5MHz A/V carrier ratio -10 to -0dB Video Standard Video input level 1.0V p-p Input Impedance 75 Visual S/N 53dB Video response: 1.0dB Differential gain:.5% 1 Front panel control board to adjust frequency, modulation level, A/V ratio, stability etc. through the LCD by tuning keys. Differential phase.5 Chrominance luminance delay 40nS Modulation level 87.5% Audio Input level range +5 to +5dBmV Input impedance >10k Frequency response 1.0dB Aural S/N 55dB Distortion 0.4% Video/audio separation 6.5MHz 500Hz Maximum sound deviation 50KHz Audio modulation deviation:1 Pre-emphasis 50 s General 3 levels adjustable Power 0V/60Hz.AC Dimension 19"(W) 1.6"(D) 1.75"(H) Operating temperature: -10 +40 1 3 levels adjustable Weight about 3.5KG
Before packing and shipment, every product was quality and durability tested and approved. After opening the box, please check to ensure all components are attached. In case physical damage found, please notify distributor immediately. C78 D is designed to be ready to install in "EIA 19" type of cabinet. X0 LCD Display Upward/Value Increasing key Downward/Value Decreasing Key Left/Function selection Right/Function selection OK/Confirmation MENU key enter to or exit from menu -0dB test/rf test outlet 4 6 "F"type RF output connector output of modulated RF signal "F"type IF input connector input of TV IF signal "F"type IF output connector output TV IF signal "BNC" type Video input connector "BNC" type Audio input connector AC power supply 0V/50Hz socket with fuse
Operation Instruction Stage One Main page in normal operation. Push "MENU" key to enter Stage two Menu Page Stage Two It shows frequency of 847.5MHz video modulation rate 87.5% sound deviation 50KHz(the values of video modulation rate and sound deviation are for reference only) 4 Menu pages with 7 items item selected indicated by, can be moved upward by and downward by,to the left by,to the right by. After choosing, confirm the selection by the OK key and go on to next stage. 1.Freq. selection.video modulation rate selection 5.Level selection for A/V carrier 6.RF level selection Stage three 3.Sound frequency selection 4.Sound deviation selection 7.characters edit Adjustment Page,pushing the upward and downward key to adjust data. By pushing the key continuously over seconds, fast data adjustment will occur. After adjustment, push the MENU key to exit this page. Frequency 847.5MHz Sound deviation Stepping KHz Range 6 68KHz Video modulation rate Stepping 1.5% Range 53 99.5% A/V carrier ratio Stepping 1dB Range -10-0dB Sound frequency 6.50MHz 6.5\6.0\5.5\4.5 RF level: for reference Stepping 1dB Range 0dB 3
Operation Instruction Character edit English A~Z Number 0~9 Data Storage Push twice the MENU key to enter Storage Page. YES: push OK key, all data stored automatically. NO: push OK key all data stored according Back to Main Page to last setting. Back to Main Page. Data storage Storage finished All data adjusted, system will be back to normal operation. Last data memory with Power off.. * When power off and restart, it'll operate according to last setting data. (Last data memory with power off) * To avoid influence from temperature change, data adjusting should started after the modulator has operated for half an hour. * When several machines works together, enough space for heat emission is necessary or put them in cabinet with exhaust device. If problem occurs and persists, please contact your local authorized agent. Please do NOT disassemble the machine yourself and cause permanent damage. 4