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Summary of Contents for MFJ MFJ-752D
- Page 1 MFJ SIGNAL ENHANCER II Model MFJ-752D INSTRUCTION MANUAL CAUTION: Read All Instruction Before Operating Equipment MFJ ENTERPRISES, INC. P.O. BOX 494, MISSISSIPPI STATE, MS 39762, USA 925- 0037D- 752D- REV 1 COPYRIG HT 2010 MFJ ENTERPRISES, INC.
- Page 2 INSTALLATION 1. Connect any 9-18V DC supply to the power jack on the back of the MFJ-752D. The adapter must have a 2.1 mm coaxial plug with the center pin position and the sleeve ground.
- Page 3 AUXILIARY FILTER: Function Switch: To select the PEAK function push button to the IN position. To select the NOTCH function push button to the OUT position. Frequency Control: Adjusts the center frequency of the auxiliary peak and notch circuits between approximately 300 Hz to 3000 Hz. Selectivity Control: Adjusts the bandwidth of the auxiliary circuits from 40 Hz to almost flat.
- Page 4 peak will form at the frequency set on the FREQUENCY control. The more the selectivity is increased, the more pronounced the peak will become. This peak may be preferred for CW operation when extra audio is needed and low frequency signals are not a problem.
- Page 5 Increase audio gain to compensate for the loss of audio. ALIGNMENT The MFJ-752D primary filter is a two-stage filter which required proper aligned at the factory. If for any reason a realignment is necessary use the procedure below. UNDER NO OTHER CIRCUMSTANCES SHOULD THE INTERNAL TRIMMERS (R319 and R5320) BE ADJUSTED.
- Page 6 CONTROL SETTINGS: AUXILIARY FREQUENCY CONTROL: Minimum AUXILIARY SELECTIVITY CONTROL: Minimum AUXILIARY FUNCTION SWITCH: In for Peak POWER: PRIMARY FUNCTION: Notch PRIMARY SELECTIVITY: 3 o'clock PRIMARY FREQUENCY: Maximum ALIGNMENT PROCEDURE: 1. Connect scope input to the speaker output or phone output of the filter. 2.
- Page 7 MFJ-752D Schematic Diagram...
- Page 8 MFJ Enterprises, Inc. warrants to the original owner of this product, if manufactured by MFJ Enterprises, Inc. and purchased from an authorized dealer or directly from MFJ Enterprises, Inc. to be free from defects in material and workmanship for a period of 12 months from date of purchase provided the following terms of this warranty are satisfied.
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