MFJ Enterprises MFJ-1792 Instructions Manual

Vertical antenna

Hide thumbs

Table of Contents

Quick Links

Download this manual

MFJ-1792/1793 Vertical Antenna

Instructions

MFJ-1792/1793 Vertical Antenna

Need help?

Do you have a question about the MFJ-1792 and is the answer not in the manual?

Questions and answers

William D. Perkins

March 2, 2025

need manuals for MFJ 1777 and MFJ 1778

Summary of Contents for MFJ Enterprises MFJ-1792

Page 1: Table Of Contents
Choosing a Location for the Antenna................3 Grounding........................3 Maintenance ........................4 Tools and Time Required for Assembly ................. 4 MFJ-1792 Parts List ......................5 Assembly and Installation Procedure ................6 Raising the Antenna ......................11 Tuning the Antenna......................12...
Page 2: Introduction
80 meters. DESCRIPTION The MFJ-1792 / 1793 operates as a full quarter wave on 40 and 20 meters, and a top loaded 1/8 wavelength antenna on 80 meters. When used with a good ground system, the MFJ-1792 / 1793 has excellent efficiency and bandwidth on 40 and 20 meters.
Page 3: Bandwidth, Swr, And Power Handling
MFJ-1792/1793 Vertical Antenna Instructions aluminum tubing. The antenna has a swivel base to allow easy mounting and access to the top for tuning the 80 meter band. The swivel base is constructed with heavy duty aluminum plate, and a large diameter, super strong, solid fiberglass insulator. The antenna can be mounted on a short mast with 2"...
Page 4: Choosing A Location For The Antenna
2" OD. Soft or thin wall masts should not be used to mount this antenna to any supporting structure. The MFJ-1792 / 1793 will perform quite well in ground mounted installations with a good ground system of either welded mesh wire fence or 8 or more 33 foot long (or longer) radials.
Page 5: Tools And Time Required For Assembly
MFJ-1792/1793 Vertical Antenna Instructions protection is recommended at the bottom coax connection and also around the matching network feed point, especially in coastal areas where salty mist is commonplace. GE makes a pure silicone grease called "SILICONE DIELECTRIC COMPOUND" that can be applied SPARINGLY to the threaded area of the female connector.
Page 6: Mfj-1792 Parts List
MFJ-1792/1793 Vertical Antenna Instructions IN DEATH OR SERIOUS INJURY. FOR SAFETY PLEASE: 1.) DO NOT INSTALL THIS ANTENNA WHERE THERE IS ANY POSSIBILITY OF CONTACT WITH UTILITY LINES. 2.) DO NOT LOCATE THE ANTENNA SUPPORT WHERE IT CAN CONTACT POWER LINES IN THE EVENT OF MECHANICAL FAILURE OR ACCIDENT.
Page 7: Assembly And Installation Procedure
MFJ-1792/1793 Vertical Antenna Instructions 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 Insulators [ ] One Triangular Support Bracket [ ] Nine 6-32 x 1/2"...
Page 8 MFJ-1792/1793 Vertical Antenna Instructions 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.
Page 9 MFJ-1792/1793 Vertical Antenna Instructions 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.
Page 10 MFJ-1792/1793 Vertical Antenna Instructions 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.
Page 11 MFJ-1792/1793 Vertical Antenna Instructions 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 to reach their attaching ground position when antenna is up.
Page 12: Raising The Antenna
MFJ-1792/1793 Vertical Antenna Instructions 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 the ground pole.
Page 13: Tuning The Antenna
TUNING THE ANTENNA Measure and record the frequency on which the lowest SWR occurs for the 80, 40 and 20 meter bands. The MFJ-1792 is tuned for lowest SWR either at the lower frequency of each band or slightly below.
Page 14: Technical Assistance
This will help with any questions the technicians may have. You can also send written correspondence to MFJ Enterprises INC., PO Box 494, Mississippi State, MS 39762. Send a complete description of your problem, an explanation of exactly how you are using your unit and a complete description of your station.
Page 15 Wired and tested PC board products are covered by this warranty provided only the wired and tested PC board product is returned. Wired and tested PC boards installed in the owner's cabinet or connected to switches, jacks, or cables, etc. sent to MFJ Enterprises, Inc. will be returned at the owner's expense unrepaired.

This manual is also suitable for:

Mfj-1793