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Table of Contents
Related Manuals for MFJ MFJ-8504
Summary of Contents for MFJ MFJ-8504
- Page 2 Fully shielded enclosure Reverse polarity power supply protected with internal fuse The MFJ-8504 is an amplified, single or dual input, one to four output, broadband receiver multicoupler. This broadband coupler has excellent performance over a very wide frequency range, from below 300 kHz to above 500 MHz.
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Page 3: Quick Start
The plug must be center pin positive. Use a good well-filtered supply. Connectors The MFJ-8504 has two standard BNC input connectors. It is best to keep the receive antenna(s) well away from any transmitting antennas. This unit is generally as safe as any SDR receiver. -
Page 4: General Overview
If the receiver is ideal in gain and sensitivity, without any antenna connected, you should just perceptibly hear the background noise hiss change turning the MFJ-8504 off and on. Receiver sensitivity beyond this point will decrease dynamic range. -
Page 5: Filter Installation
Filter Jumpers Termination Jumpers Figure 1 Filter Installation Filter Jumpers Antenna Jumper Settings Antenna Function Port No Filter 1 TO 4 FL 1 ONLY 2 TO 3 FL 2 ONLY 1 TO 2 FL 2 ONLY 2 TO 3 FL 1 - 1 FL1 AND 2 2 TO 3 2 TO 3... - Page 6 If no filters are used then only ANTENNA 1 is available for input. Place the filters in the MFJ-8504 and set the jumpers according to the Filter Jumper chart to properly connect the filters up.
- Page 7 Schematics MFJ-8504 Main Board High Pass Filter Low Pass Filter Notch Filter Band Pass Filter...
- Page 8 Filter Board Standard Values 862-8504-HP 30MHz High Pass Part VALUE Desc C1, C3 56pF 220-0056 CAPACITOR, MULTILAYER, .1, 50V, 5%, NPO, 56 PF 33pF 220-0033 CAPACITOR, MULTILAYER CER., NPO, 5%, 50 V, 33 PF L1, L2 0.27uH 401-2270 INDUCTOR, MOLDED, .3~, 10%, 0.27UH J1, J2 5 PIN SOCKET 612-3105...
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Page 9: Band Pass Filter
Band Pass Filter The MFJ-8504-BP is a blank board for use by the customer to produce custom band pass filters such as a single Ham Band to limit out of band signals and possible overload. The board consists of a 5-pole low pass filter to set the upper limit of signals and a 5-pole high pass filter to set the lower limit of signals. - Page 10 NOTES...
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Page 11: Full 12-Month Warranty
MFJ Enterprises, Inc. at the time of warranty service. MFJ Enterprises, Inc. shall have the discretion to deny warranty without dated proof-of- purchase.
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