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Tarheel Antennas MFJ-1792 Instruction Manual

Manual is about: Vertical Antenna

Summary of MFJ-1792

  • Page 1

    Mfj-1792/1793 instruction manual vertical antenna mfj-1792/1793 vertical antenna table of contents: introduction ................................................................................................................ 1 description................................................................

  • Page 2: Mfj-1792/1793

    Mfj-1792/1793 instruction manual vertical antenna 1 mfj-1792/1793 instruction manual introduction in cases where vertical polarization and low wave angle is desired, at frequencies below 7 mhz, the antenna must a vertical. At these low frequencies, the height of a vertical half wave dipole antenna i...

  • Page 3

    Mfj-1792/1793 instruction manual vertical antenna 2 the radiating element on the 80 meter band is 33 feet tall, constructed with large diameter aluminum tubing. The smallest diameter used is 1 1/8 inches. The antenna has a swivel base to allow easy mounting and access to the top for tuning the 80 me...

  • Page 4

    Mfj-1792/1793 instruction manual vertical antenna 3 2.) do not locate the antenna support where it can contact power lines in the event of mechanical failure or accident. 3.) follow the guidelines for antenna installation as recommended by the us consumer product safety commission. Choosing a locati...

  • Page 5

    Mfj-1792/1793 instruction manual vertical antenna 4 maintenance your antenna is constructed of heavy duty non-corrosive materials and should withstand normal climates for many years. The use of some type of coaxial connector moisture protection is recommended at the bottom coax connection and also a...

  • Page 6

    Mfj-1792/1793 instruction manual vertical antenna 5 safety precautions!! 1.) this antenna is an electrical conductor. 2.) any contact between the antenna, feedline or supporting structure and power lines will result in death or serious injury. For safety please: 1.) do not install this antenna where...

  • Page 7

    Mfj-1792/1793 instruction manual vertical antenna 6 [ ] one 10-32 nut [ ] one 1/4" id spacer [ ] nine 1/4-20 nuts [ ] nine 1/4" split washers [ ] two 6-32 nuts hardware bag #3 (20 meter kit - for 1793 only) [ ] two 3/16" id x 1" aluminum couplers [ ] three l-brackets [ ] three 4.5" x 3/4" fiberglass...

  • Page 8: Figure 1

    Mfj-1792/1793 instruction manual vertical antenna 7 note: this antenna can be mounted on ground or roof level mounts only! 1- prepare a ground-level mounting mast that will permit easy initial testing and adjustment. Set up stable supports (table, saw horses etc.). Also a flat ground can be used. 2-...

  • Page 9: Figure 3

    Mfj-1792/1793 instruction manual vertical antenna 8 8- insert end b of tube 4 into end a of coupler 2. Line up holes. Bolt tube and coupler together with a 1/4 - 20 x 1 3/4" bolt, 1/4 - 20 nut and split washer. Place and secure a hose clamp over the slit. See figure 2. 9- insert end b of tube 5 into...

  • Page 10: Figure 5

    Mfj-1792/1793 instruction manual vertical antenna 9 16- screw a #10 nut over the threaded rod. Slide the threaded end of the 55" rod through the triangular support bracket with the angle pointing down. Thread another #10 nut over the rod to sandwich the bracket between the two nuts. Refer to figures...

  • Page 11: Figure 8

    Mfj-1792/1793 instruction manual vertical antenna 10 23- attach the 20 meter element to the antenna using hose clamps over the l- brackets. Secure hose clamps. See figure inside front cover and figure 3. 24- place guy wires on guy wire mounts. Make sure the guys are non- conductive and long enough t...

  • Page 12

    Mfj-1792/1793 instruction manual vertical antenna 11 26- assemble the loading coil assembly by placing six of the 27" long spokes into the ring assembly. Tighten the 6-32 x 1/4" screws until the spokes are snug. See figure 9. 27- with the help of another person, move the antenna to the location of t...

  • Page 13

    Mfj-1792/1793 instruction manual vertical antenna 12 32- secure antenna to the base mount, by placing a u-bolt saddle clamp between the fiberglass solid rod and the aluminum wall. (see inside front cover) line up the saddle clamp with the 1/4" holes. Insert the u-bolt through. Thread two 1/4" - 20 n...

  • Page 14

    Mfj-1792/1793 instruction manual vertical antenna 13 80 m: 1" trimmed off a spoke equals approximately 10 khz warning: shortening the spokes from the looped end will affect the performance of the antenna and degrade its power handling capabilities. If the resonant frequency on 80 meter is lower than...

  • Page 15

    Mfj-1792/1793 instruction manual vertical antenna 14.