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MFJ-1780 

Box Fan

 Loop Antenna                                                         Instruction Manual 

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MFJ-1780

 Box Fan

 Portable loop Antenna  

 
 

WARNINGS ................................................................................................................... 2 
THEORY OF OPERATION........................................................................................... 3 
PATTERNS, POLARIZATION AND LOCATION....................................................... 3 
NULLLING UNWANTED SIGNALS:.......................................................................... 4 
Vertical Polarization: ...................................................................................................... 4 
Horizontal Polarization: .................................................................................................. 5 
OUTDOOR USE............................................................................................................. 5 
INDOOR USE................................................................................................................. 6 
CONTROLLER BOX INSTALLATION ....................................................................... 7 
CONTROLLER BOX OPERATION ............................................................................. 7 
TESTING AND OPERATION....................................................................................... 9 
GENERAL OPERATION AND TROUBLESHOOTING ............................................. 11 
TUNING WHEN YOU DO NOT KNOW THE LAST OPERATING FREQUENCY . 11 
TUNING WITH A KNOWN DIRECTION OF FREQUENCY MOVEMENT ............ 12 
TROUBLE SHOOTING ................................................................................................. 12 
TECHNICAL ASSISTANCE ......................................................................................... 13 

Summary of Contents for Box Fan -1780

Page 1: ...NTED SIGNALS 4 Vertical Polarization 4 Horizontal Polarization 5 OUTDOOR USE 5 INDOOR USE 6 CONTROLLER BOX INSTALLATION 7 CONTROLLER BOX OPERATION 7 TESTING AND OPERATION 9 GENERAL OPERATION AND TROUB...

Page 2: ...all welded low resistance high current butterfly tuning capacitor WARNINGS Keep this antenna out of reach of adults children and animals Any contact with this antenna while transmitting will cause sev...

Page 3: ...little difference between the signal from the MFJ Box Fan Loop and the signal from a larger size none portable loop at the same height PATTERNS POLARIZATION AND LOCATION WARNING Keep this antenna out...

Page 4: ...of the attic the null can be positioned directly below and the antenna through the building This placing arrangement helps receiving by reducing the noise pick up from devices in the building and hel...

Page 5: ...ot expect the best results if you mount this loop antenna horizontally less than 15 feet above ground Since ground wave signals only propagate well along the earth when they are vertically polarized a...

Page 6: ...ace is available The MFJ 1780 is a portable antenna with an easy carrying handle you can take it with you anywhere hotel camp sites traveling etc You can place the antenna on a picnic table wooden tab...

Page 7: ...You must only use the MFJ 1312B supply or batteries to operate this unit If you chose to use an other power supply to power this unit the power supply must not have a common ground with anything else...

Page 8: ...xial plug with the center conductor positive The MFJ 1312B power supply will supply the correct power to the controller box There is also an internal battery connection that uses two 9 volt batteries...

Page 9: ...Y FURTHER MAKE SURE YOU UNDERSTAND ALL WARNINGS BEFORE YOU ATTEMPT TO TEST OR OPERATE THIS ANTENNA 1 With power disconnected set the group FAST TUNE switches in the OFF position out 2 Connect the loop...

Page 10: ...e capacitor back to the tuning position with the lowest SWR Note The tuning of this antenna is very sharp due its high Q and narrow bandwidth few KHz Watch you meter carefully while tuning Now you hav...

Page 11: ...ight as the loop moves to the highest frequency range After the LED goes out release the Fast Tune UP button 2 Select the proper wattmeter range for the power you intend to use in tuning the loop then...

Page 12: ...ground If you push a Tune button and the Tune LED stays on for more than 40 seconds Check for moisture in the feedline or antenna If you press a Tune button and an LED does not light Check to see if...

Page 13: ...f the continental U S A 601 323 5869 You will be best served 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...

Page 14: ...is available by calling 601 323 5869 5 This warranty does not apply to kits sold by or manufactured by MFJ Enterprises Inc 6 Wired and tested PC board products are covered by this warranty provided o...

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