Preview only show first 10 pages with watermark. For full document please download

Mod6 Quad A/v Rf Pal Modulator

   EMBED

Share

Transcript

Below you can find a typical application example using MOD6: MOD6 Quad A/V RF PAL Modulator DESCRIPTION MOD6 is a professional DSB quad RF PAL, "full band" modulator. It can be used to convert and distribute four Audio/CVBS signals (eg. coming from 4 x DVD players or STBs etc.) into a CATV network as RF PAL signal. It consists of four independent internal RF modulators, able to work in different frequencies in the VHF/UHF band according to the selected norm! The onboard display and buttons provides a very friendly user interface for controlling and programming the MOD6. Finally, a very powerful amplifier at the output of MOD6 provides an RF output level of 100dBμV approx. in each output channel! Technical Specifications Figure Νο2 Lemco Electronics - www.lemco.gr VIDEO input: Input connector: : 4 x 1 Vpp / 75Ω 4 x RCA' female' Audio input Input connector: : 4 x Mono 0,25...0,5 VRMS / 47 ΚΩ 4 x L/R RCA 'female' Working frequencies : 174...862MHz (Norm B/G) RF output level Output attenuator Norm: Output Impedance : : : : Power Supply Operation Temperature : 230VAC / 5VA o : 0...+40 C 100dBμV approx. (in each channel) 0...-20 dB PAL B/G 75Ω MOD6 DISPLAY Step 1: Using the "MOD SELECT" button, we are able to choose which RF internal modulator we want to program. Step 2: Using the UP/DOWN buttons we are able to choose the required RF output channel. The RF output channels are presented in frequency order. The combination: "00" mutes the RF output of the selected modulator. Step 3: Wait for 2-3 seconds for the internal PLL to lock in desired frequency. Step 4: We are repeating the steps from 1 to 3 for the other modulators too. Step 5: We are able to adjust the RF output level by using the onboard attenuator. Caution!!! MOD6 is a quad DSB RF PAL modulator meaning the we must not program the output channels in adjacent channels. Typical application example Figure Νο1 1. Internal modulator selection 2. RF output channel selection using the UP/DOWN buttons. 3. LED indicates the current modulator selection 4. Displays the current RF output channel 5. Displays the frequency band of the selected output channel S-> for cable channels "S" E-> for VHF/UHF channel "C" or "E" 6. Attenuator 0...-20dB Functionality description MOD6 consists of four independent internal RF modulators which can be program in the following steps: MOD6 it is recommended to be used along with specific band pass filters for ultimate performance and excellent harmonics rejection, like the following:     BPF1 : BPF2 : BPF3 : BPF4 : 115...175MHz 170...230MHz 230...300MHz 300...440MHz