User manual DRAKE DIGITAL DA7543

[. . . ] 2) Mount the amplifier in the desired location, using the four mounting screw holes on the sides of the amplifier. Vertical mounting on a wall with the output end up is recommended for best ventilation and the coolest operation. OUT 4) If the power transformer is to be wall mounted, install the included bracket as shown. WALL MOUNTING HOLES OF MOUNTING BRACKET SCREW HOLES FOR WALL MOUNTING (2 each side) SCREWS FOR FASTENING MOUNTING BRACKET TO TRANSFORMER CASE 5) Connect input and output cables to the amplifier. [. . . ] Tightens cover screws after positioning. FORWARD PATH FIXED INPUT ATTENUATION LOCATION A factory installed jumper is installed here for no attenuation. To install an input attenuator, remove jumper and plug in a "SXP" type attenuator rated for the same or higher frequency as the amplifier. IN OUT IN OUT GROUND ATTENUATOR +18 dBmV +10 dBmV +16 dBmV +7 dBmV +12 dBmV + 7 dBmV GROUND +44 dBmV +44 dBmV +40 dBmV +40 dBmV +38 dBmV +38 dBmV 110 CH 110 CH 129 CH 129 CH 150 CH 150 CH INSTALLING AN INPUT EQUALIZER Follow the same basic procedure as described above for the input attenuator except that the equalizer is installed at the equalizer location shown above. NOTE ABOUT COVER REMOVAL AND REPLACEMENT This note only applies if the input attenuator has been installed. There is a spacer mounted to the inside of the top cover that will be located directly above the input attenuator. When removing or replacing the cover, be sure that all of the cover screws are loosened several turns before moving the cover. Be sure the attenuator is seated fully in its socket before reinstalling the cover, and carefully place the cover in position with the spacer directly over the attenuator, before retightening the screws. POWER LED FORWARD PATH INPUT EQUALIZER LOCATION A factory installed jumper is installed here for no equalization. Install desired "QSA" type equalizer here. If the equalizer is later removed, the jumper must be reconnected between the IN and OUT connections, keeping the length as short as possible. If the input level is within the optimum input level window, distortion will be at or below that which is specified. If a higher input level is supplied, add a fixed input attenuator equal to the number of dB needed to reduce the level to be within the optimum input range. 4 Specifications and Warranty SPECIFICATIONS COMMON TO ALL MODELS Forward Gain Adjustment Range: 10 dB minimum. Slope Control Adjustment (54 MHz): 10 dB minimum. Fixed Input Attenuator: Plug-in (SXP type) available. Fixed Input Equalizer: Plug-in (QSA type) available. Frequency Coverage (return path): 5 to 36 MHz. Return Path Input Attenuator: 0 to 10 dB adjustable. RF Shielding: Leakage complies with FCC Part 76. Power Requirement: 26 VAC from supplied transformer with six foot amp-to-transformer cable. ADDITIONAL SPECIFICATIONS FOR SPECIFIC MODELS DA7533 Frequency Coverage (fwd path): 49 to 750 MHz. Output Level (maximum per channel for distortions listed below): +44 dBmV. Input Level (maximum without using fixed input attenuator): +18 dBmV. Optimum Input Level Range: +10 dBmV to +15 dBmV. [. . . ] To reduce the reverse path gain by 17 dB, move the 16 dB programmable attenuator jumper to the IN position. Then adjust the REVERSE PATH GAIN adjustment counterclockwise to obtain the additional 1 dB of attenuation. EXAMPLE 2 Assume that an installation requires 15 dB of gain reduction in the reverse path amplifier to achieve a gain of 7 dB. The step attenuator can be programmed for 12 dB (setting the 8 dB and 4 dB jumpers both to `IN') or to 14 dB (setting the 8 dB, 4 dB, and 2 dB jumpers all to `IN') and then adjusting the variable REVERSE PATH GAIN control to reduce the gain the additional 1 or 3 dB. The idea here is that one should set the step attenuator slightly less than the attenuation needed so that there can always be some fine adjustment of the variable gain control. (Jumpers at the "4 db" and "8 dB" "IN" positions) (Jumpers at the "2 dB", "4 dB", and "8 dB" "IN" positions) SUMMARY If reverse input levels are low, in the 0 dBmV area, use as little attenuation at the reverse path gain input attenuator as possible. [. . . ]