Bedienungsanleitung MFJ Enterprises MFJ 1025

MFJ Enterprises MFJ 1025



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MFJ Enterprises 

  • Noise and Interference Canceler MFJ Enterprises MFJ 1025

  • Vorschau MFJ Enterprises MFJ 1025 Handbuch:
    MFJ-1025 Instruction Manual Noise and Interference Canceler / Signal Enhancer 4 MFJ recommends a 120 Vac to 12 Vdc (nominal voltage) adapter, model number MFJ-1312B, to power this unit. This power supply has good RF noise immunity. NOISE ANTENNA The noise antenna can be a special antenna, or a spare antenna not in use at the moment. LAMP 1 is a 50 mA 12 volt dial lamp used to protect the AUXILIARY ANTENNA input from excessive voltage. Illumination or failure of LAMP 1, near the AUXILIARY antenna jack, indicates excessive RF voltages at the AUXILARY ANTENNA connector. Excessive voltage from the transmitter can, under extreme conditions, burn out LAMP 1. If using an external AUXILIARY antenna causes LAMP 1 to illuminate or burn out, discontinue using that particular antenna or relocate it further from the transmitting antenna. USE WITH BEVERAGE OR OTHER LOW NOISE ANTENNAS The MFJ-1025 can be used to enhance reception on 160 and 80 meters, even if the station already employs low noise directional receiving arrays. If the receiving antennas connect to the receiver through a special receiving antenna input connection (a receive antenna jack), the MFJ-1025 should be inserted in that lead. A suggested method follows: 1. Connect the MFJ-1025 TRANSMITTER connector to the receiver's input line. 2. Connect the MFJ-1025 AUXILIARY ANTENNA connector to the noise antenna. 3. Connect the MFJ-1025 MAIN ANTENNA connector to the Beverage or receiving array. Note: The AUXILIARY ANTENNA input has different gain distribution than the MAIN ANTENNA input. The MAIN ANTENNA input has less internal noise, but also has less available gain than the AUXILIARY ANTENNA input. In some cases weak signal performance can be improved by swapping MAIN and AUXILIARY antenna inputs. Remember the transmitter output only appears on the MAIN antenna connector, so if you are trying to transmit through the MFJ-1025 (in other words if it is connected to the main antenna output of a transceiver) you will not be able to swap connections to the MAIN and AUXILIARY antennas. Remember in order to null or peak a signal both the MAIN antenna and the AUXILIARY antenna must "hear" the same signal. If the same noise or signal is not present on both antennas, noise or signals can not be nulled or peaked. This may require adding a special antenna near the source of the unwanted signal, or a separate good receiving antenna. MFJ-1025 Instruction Manual Noise and Interference Canceler / Signal Enhancer 5 GROUNDING CONSIDERATIONS Connect the MFJ-1025 to the station ground buss with a short ground connection. Always use a good station ground connection to reduce th .....
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