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Giant Box Fan Antenna

MFJ-1784

INSTRUCTION MANUAL

©

2020

MFJ Enterprises, Inc.

300 Industrial Park Rd. Starkville, MS 39759

P: (662) 323-5869
F: (662) 323-6551

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Summary of Contents for MFJ-1784

Page 1: ...Giant Box Fan Antenna MFJ 1784 INSTRUCTION MANUAL 2020 MFJ Enterprises Inc 300 Industrial Park Rd Starkville MS 39759 P 662 323 5869 F 662 323 6551 ...

Page 2: ...al handbooks or other official publications The copy of this manual provided to the customer will not be updated to reflect current data Customers using this manual should report errors or omissions recommendations for improvements or other comments to MFJ Enterprises 300 Industrial Park Road Starkville MS 39759 Phone 662 323 5869 Fax 662 323 6551 Business hours M F 8 00 AM 4 30 PM CST ...

Page 3: ...TURES 6 3 SYSTEM SETUP OPERATION 6 3 1 CONTROLS CONNECTIONS 7 3 2 TUNING 8 3 3 OUTDOOR INDOOR USE 8 4 TECHNICAL ASSISTANCE 9 List of Figures 1 Horizontally polarized Electromagnetic Plane Wave 1 2 The Electromagnetic Spectrum 2 3 Various Mounting Orientations 4 4 Field and Null Patterns 5 5 Typical Station Setup 6 6 Super Hi Q Loop Remote Control 7 i ...

Page 4: ...verted into signal by the radio The term electromagnetic field refers to the electric and magnetic environment existing at some location due to a radiating source such as an antenna Figure 1 Horizontally polarized Electromagnetic Plane Wave An electromagnetic wave consists of oscillating orthogonal electric E and magnetic B fields These fields propagate together with direction and velocity v In a ...

Page 5: ...4 2 1 INTRODUCTION The MFJ 1784 Giant Box Fan Portable Loop Antenna is the next step in box fan antennas Adding four feet to the circumferance and fine tuning the physical dimensions for the perfect inductance has created an antenna that functions on more bands than its predecessor while still being slim enough to fit just about anywhere Covering from 7 MHz to 22 MHz this is the best performing po...

Page 6: ...apacitor above 10 kV This consideration also applies to any conductors used to connect the loop to the capacitor Therefore care must be taken when choosing materials in the loop The best electrical connections possible are those using soldered or welded joints The heart of the MFJ 1784 is the Butterfly loop tuning capacitor which has no rotating electrical contacts Coupling this capacitor to a low...

Page 7: ...her objects as possible The null be placed along the direction that you do not want to transmit or receive If the loop can not be placed more than fifteen feet above ground level the best placement arrangement will be with the loop oriented vertically Otherwise it is possible to mount the antenna horizontally In the vertical position the Box Fan loop nulls can be used to reduce interference from u...

Page 8: ...e with the loop As you move around the loop towards the sides the pattern skews and eventually becomes completely horizontal broadside to the loop Unlike linear verticals small vertically polarized loops also radiate straight up and down from the antenna This high angle of radiation can be used to cover short distances by sky wave The high angle horizontal radiation in a vertically polarized loop ...

Page 9: ...e Control RF and DC sent along a single piece of coax Foldable Fiberglass Feet Feet are designed to rotate out of the way for mounting Convenient Carry Handle An ergonomic aluminum handle makes carrying the MFJ 1784 a breeze 3 SYSTEM SETUP OPERATION Figure 5 shows a simple layout for a portable station using the MFJ 1784 Connect the controller either the standard one or the Deluxe Loop Controller ...

Page 10: ...rent power supply than the one provided the power supply must not share a common ground with anything else in your radio system Figure 6 Super Hi Q Loop Remote Control The controller supplies the control signals to the loop antenna through the coaxial feedline These signals are low voltage and low current so that the length of the coaxial line does not affect the operation of the motor It is impor...

Page 11: ...then release Step 4b If the SWR degrades switch to the other button Hold it until you pass the minimum then release Step 5 Once past the SWR minimum press and hold the opposite FINE TUNE button until the SWR is matched Step 6 The MFJ 1874 is now ready to operate at full power 3 3 OUTDOOR INDOOR USE The best outdoor location for the MFJ 1784 or any other antenna is high above ground and away from m...

Page 12: ... 662 323 0549 or the MFJ Factory at 662 323 5869 You will be best helped if you have your unit manual and all information on your station handy so you can answer any questions the technicians may ask You can also send questions by mail to MFJ Enterprises Inc 300 Industrial Park Road Starkville MS 39759 by Facsimile FAX to 662 323 6551 or by email to techinfo mfjenterprises com Send a complete desc...

Page 13: ...USER NOTES ...

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