User manual DRAKE DIGITAL AC1686

[. . . ] Retain Instructions--The safety and operating instructions should be retained for future reference. Heed Warnings--All warnings on the product and in the operating instructions should be adhered to. Follow Instructions--All operating and use instructions should be followed. Attachments--Do not use attachments that are not recommended by the product manufacturer as they may cause hazards. [. . . ] Safety Check--Upon completion of any service or repairs to this product, ask the service technician to perform safety checks to determine that the product is in proper operating condition. Wall or Ceiling Mounting--The product should be mounted to a wall or ceiling only as recommended by the manufacturer. Heat--The product should be situated away from heat sources such as radiators, heat registers, stoves, or other products (including amplifiers) that produce heat. NOTE TO CATV SYSTEM INSTALLERS: THIS REMINDER IS PROVIDED TO CALL THE CATV SYSTEM INSTALLER'S ATTENTION TO ARTICLE 820 - 40 OF THE NEC THAT PROVIDES GUIDELINES FOR PROPER GROUNDING AND, IN PARTICULAR, SPECIFIES THAT THE CABLE GROUND SHALL BE CONNECTED TO THE GROUNDING SYSTEM OF THE BUILDING, AS CLOSE TO THE POINT OF CABLE ENTRY AS PRACTICAL. EXAMPLE OF ANTENNA GROUNDING ANTENNA LEAD IN WIRE GROUND CLAMP ANTENNA DISCHARGE UNIT (NEC SECTION 810-20) ELECTRIC SERVICE EQUIPMENT GROUND CLAMPS POWER SERVICE GROUNDING ELECTRODE SYSTEM (NEC ART 250, PART H) GROUNDING CONDUCTORS (NEC SECTION 810-21) Table of Contents/Specifications/General Description TABLE OF CONTENTS ii. Caution Statements Important Safety Instructions Table of Contents / Specifications General Description 2. 5. iii Front and Rear Panel Connections and Controls Installation - Applications Service / If You Need To Call For Help Warranty SPECIFICATIONS 54 - 860 MHz 16. Input Adjustable Attenuator: Front panel setting, 15 dB minimum range. Maximum Input Level: +60 dBmV (input attenuator set to limit output level to rated maximum), each input. Bandwidth: Number of Inputs: Input Impedance: Input Return Loss: Input-Input Isolation: Maximum Output Level: +48 dBmV each video carrier with 16 equal input NTSC signals. Composite Triple Beat: -60 dBc, 16 channels at output level of +48 dBmV per channel. Cross Modulation: -60 dBc, 16 channels at output level of +48 dBmV per channel. Weight: 4 Lbs. GENERAL DESCRIPTION AC1686 ACTIVE COMBINER POWER OUTPUT TEST OUTPUT LEVEL 20 dB The AC1686 Active Combiner permits combining the outputs of up to 16 Audio/Video Modulators, Channel Processors, etc. The unit includes a low distortion Ga As output amplifier to permit linear signal output and very low input noise figure. The AC1686 is housed in a standard 1-3/4" H x 19" W rack space. A monitor output is provided at the front panel of the combiner. AC1686 Attenuator 0-15dB adjustable Input Amp INPUTS 1-16 +60 dBmV maximum Output Level Power Supply Power Indicator -20 dB Low Noise Ga As Amp +20 dB OUTPUT Monitor Output 14 VAC Power Input AC1686 BLOCK DIAGRAM 2 Front and Rear Panel Connections and Controls F1 F2 F3 FRONT PANEL AC1686 ACTIVE COMBINER POWER OUTPUT TEST OUTPUT LEVEL 20 dB F1 - POWER Indicator Lights to indicate that the combiner is connected to a source of power. F2 - MONITOR Test Point Connector This type F connector is provided for sampling the combined RF Output of the combiner. The level of each signal at this connector is approximately 20 dB below the level of the respective signal present at the rear panel `RF OUTPUT' connector. The rear panel output connector must be terminated in 75 Ohms. F3 - OUTPUT LEVEL Control This screwdriver adjusted attenuator permits setting the attenuation of the combined signals applied to the `INPUTS 1-16' rear panel connectors prior to amplification. The range of attenuation adjustment is at least 15 dB. REAR PANEL R1 R2 R3 R1 - INPUTS 1-16 Connectors These type F connectors accept signals with levels up to 60 dBmV each, maximum. R2 - RF OUT Connector This type F connector provides the single coax output connection of the combined signal inputs. With the front panel `OUTPUT LEVELS 1-16' control set maximum clockwise, the signal level output is approximately 2 dB to 3 dB above the respective signal level input at the `INPUTS 1-16' connectors. For best noise performance, it is best to keep modulator outputs within 5 dB of the maximum output. Start with the active combiner attenuation adjustment at the extreme counterclockwise position and adjust to bring output levels up to desired level. Next, adjust individual modulator outputs slightly to equalize all channels. 4 Service / If You Need To Call For Help In the rare case that this fuse is blown, the transformer must be replaced. [. . . ] DRAKE COMPANY or the nearest authorized service facility, or ship the same in its original container or equivalent, fully insured and shipping charges prepaid. Correct maintenance, repair, and use are important to obtain proper performance from this product. DRAKE COMPANY determines is due to: (1) Improper maintenance or repair, including the installation of parts or accessories that do not conform to the quality and specifications of the original parts. All implied warranties, if any, including warranties of merchantability and fitness for a particular purpose, terminate three (3) years from the date of the original purchase. [. . . ]