DX Engineering DXE-VGMT-3CG Manuale utente

75/80 Meter

Full Size

Quarter-Wave

Vertical Antenna

DXE-7580FS-VA-2

US Patent No. 8,130,168

DXE-7580FS-VA-2-INS Revision 6d

1200 Southeast Ave. - Tallmadge, OH 44278 USA

Phone: (800) 777-0703 ∙ Tech Support and International: (330) 572-3200

Fax: (330) 572-3279 ∙ E-mail: [email protected]

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Table of Contents

Introduction

Features

Warning

Overhead Power Line Safety

Tools Required

Manual Updates and Information

Installation Sequence

Site Selection

Mounting Pipe

Coaxial Cable to Mounting Pipe

Radial System

Assembly Notes

Radial Plate to Mounting Pipe

Attaching Ground Radial Wires to the Radial Plate

Overall Pivot and Antenna Base Assembly Reference Drawing

Pivot Base and Lower Antenna Assembly

Mounting and using the Optional DXE-VRW-1 Manual Winch

General Information about Aluminum Tubing

Assembling the Vertical Sections

Mating the Vertical Elements to the Pivot Base Assembly

Feedline Connection

Optional Guy Rope and Anchor Installation

Tuning the Vertical

Optional DXE-VMN-1 Vertical Antenna Matching Network

Locking the Pivot Base

DXE-7580FS-VA-2 Part Lists

Pivot Base Assembly

Optional DXE-VRW-1 Manual Winch Assembly

Feedpoint Hardware

Vertical Elements Assembly

Additional Material Required but not Supplied

Suggested Parts Not Included

Optional Accessory Items

Technical Support

Warranty

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Introduction

Congratulations on obtaining your DX Engineering DXE-7580FS-VA-2 Full size 75/80 Meter

Quarter-Wave Vertical Antenna. With this antenna you will have a high-performance vertical

antenna specifically for the 75/80 meter bands. The DX Engineering 68 foot vertical antenna

supplies the highest possible performance to achieve the strongest possible presence at your power

level and be competitive.

A FULL SIZE quarter-wave high-performance antenna that provides all the important design

details. The thick-wall 6061 sections provide you with a very stout antenna that can stay up with no

guying necessary and no worry on your part. When expecting a big storm the antenna can easily be

lowered with the supplied Heavy Duty Plus Stainless Steel Pivot Base (US Patent 8, 130,168) with

the optional hand winch.

A 2:1 SWR Bandwidth of 466 to 557 kHz depending on your radial field. Your internal tuner can

get SWR down to 1:1 on any DXing Frequency for maximum power transfer.

The DX Engineering DXE-7580FS-VA-2 is a slow taper 68 foot high vertical antenna system. The

vertical antenna is specifically designed to operate on 75/80 meters. Included with this antenna

system is a rugged heavy duty stainless steel pivot fixture for ease of assembly and adjustments.

Engineered with 6063 corrosion-resistant aluminum tubing, stainless steel mounting brackets and

stainless steel hardware, this antenna is very durable and attractive.

Features

Ultra-WIDE SWR Bandwidth and Unbeaten Gain

Highest Wind Ratings - High Strength 6063/6061 Tubing Manufactured to DX Engineering

Specifications

Easy Tilt Up and Down - Specially Manufactured Heavy Duty Stainless Steel Pivot Base

High Power Handling Capacity

No Rust - 100% Stainless Steel Tubing Clamps and Hardware

Reliability Second to None - Specially Manufactured Stainless and Aluminum Saddle

Clamps, Stainless Bolts and Precision Machining on each antenna

5 kW SSB and CW rated - unparalleled reliability

High Strength Heavy Duty Pivoting Base - US Patent No. 8,130,168

Ultra-rugged construction starts with 3 inch OD Aircraft Grade heavy wall tubing

Self supporting - will withstand steady-state winds in excess of 90 mph without guying

(guying required under extreme wind speed or ice conditions)

Massive Extren® channel insulator

Laser-cut high strength Stainless Steel brackets

The optional DXE-VRW-1 Manual Winch for easy one-person raising and lowering of the antenna

is available from DX Engineering. The DXE-VRW-1 winch can be moved between similar

antennas in a multi-antenna installation.

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This antenna system requires the installation of a heavy duty mounting pipe set in concrete.

Specifically, 3" OD (max) high strength galvanized steel tubing with 0.250” minimum wall

thickness and 7’ minimum length, which is available from DX Engineering; part number DXE-

VGMT-3CG. A customer supplied 2-1/2" Schedule 80 pipe that has an outside diameter of 2.875"

is also suitable. Thirty seven inches of the mounting pipe should extend above ground level. Depth

of the mounting hole and amount of concrete is dependent on local soil type, condition and

antenna guying.

WARNING!

INSTALLATION OF ANY ANTENNA NEAR POWER LINES IS DANGEROUS

Warning:Do not locate the antenna near overhead power lines or other electric light or power

circuits, or where it can come into contact with such circuits. When installing the antenna, take

extreme care not to come into contact with such circuits, because they may cause serious injury or

death.

Overhead Power Line Safety

Before you begin working, check carefully for overhead power lines in the area you will be

working. Don't assume that wires are telephone or cable lines: check with your electric utility for

advice. Although overhead power lines may appear to be insulated, often these coverings are

intended only to protect metal wires from weather conditions and may not protect you from electric

shock

Keep your distance! Remember the 10-foot rule: When carrying and using ladders and other long

tools, keep them at least 10 feet away from all overhead lines - including any lines from the power

pole to your home.

Tools Required

Two 9/16" wrenches, (one of them should be open-end)

One 7/16" open end wrench

Two 3/4" wrenches

Medium size flat blade screwdriver or 5/16" & 1/4” nut drivers for the element clamps

Tape measure

Black Felt Tip marker

Manual Updates and Information

Every effort is made to supply the latest manual revision with each product. Occasionally a manual

will be updated between the time your DX Engineering product is shipped and when you receive it.

Please check the DX Engineering web site (www.dxengineering.com) for the latest revision manual.

- 4 -

Please - Take the time to read the entire manual before you start assembly. There are plenty of

pictures and drawings to see, and if you read the entire manual first, you'll get a better feel for the

overall construction methods described. Assembly is not difficult, but there are a number of parts

that must go together in a certain sequence to make assembly easier.

Installation Sequence

1. Site Selection

2. Mounting Pipe

3. Coaxial Cable to Mounting Pipe

4. Radial System

5. Pivot Base Assembly (US Patent No. 8,130,168)

6. Mounting Pivot Base to Mounting Pipe

7. Antenna Assembly

8. Tuning

Site Selection

Select a mounting location clear from power lines, structures and other antennas by a minimum of

78 feet (68 + 10 ft safety rule). Consider overhead power lines, utility cables and wires. The

further away the vertical is mounted from local noise sources or other metallic objects, which can

re-radiate noise and affect the tuning, radiation pattern and SWR, the better. Determine the direction

you want the antenna to pivot and make sure there is adequate clearance (at least 80 feet).

Mounting Pipe

DX Engineering has a galvanized Chromoly Steel mounting mast available - Part Number DXE-

VGMT-3CG is 3 inches OD, Chrome-Moly 4130 Steel Tubing, 100K PSI Min. Yield, 3 in. OD,

0.250 in. Wall, 7 ft. Length,

- 5 -

This mounting pipe must be permanently mounted in the ground, preferably in a concrete base 2

feet by 2 feet by 4 feet deep (with gravel below for drainage). The antenna system requires this type

of mounting to help withstand the lateral forces present on the

antenna during wind conditions and when operating the pivot

function. Make the hole deep enough to accommodate at least 4

feet of pipe and 4 to 6 inches of gravel at the bottom for drainage.

Set the mounting pipe on the gravel, use the concrete to fill

around the pipe per the concrete instructions. Fill the hole until

the concrete is level with the ground around it. Use a level on the

mounting pipe as you fill the hole to be sure the mounting pipe is

vertically straight.

Your location, landscape and ground conditions may require

different mounting solutions in order to have the steel

mounting pipe and the vertical antenna in a secure position.

Note: Galvanized steel, rather than aluminum, is much more

suitable for mounting in concrete. Aluminum will

quickly corrode due to incompatibility with the

materials used to make concrete.

Coaxial Cable to Mounting Pipe

The coaxial cable should be routed to the base of the antenna system and be buried below the radial

system. PVC Conduit pipe may be used to house the coaxial cable. Bury the cable 6" to 12" below

ground level.

Radial System

The use of a radial system is a key requirement for a high performance

quarter wave vertical antenna system. With a vertical antenna system,

the radials are the second half of the antenna. The radials contribute to

the radiation efficiency of the entire vertical antenna system.

At a minimum, 32 radials, each 65 feet long, should be used with this

antenna. DXE-RADW Radial Wire, a 14 gauge stranded copper with a

black relaxed PVC insulation wire is suggested for the best results.

The wire radials should placed as symmetrically as possible straight

from the feedpoint around the vertical antenna and spaced evenly,

regardless of how many radials are used. Do not cross or bunch any radial wires as this nullifies

their effectiveness. If you have limited space, put in as many straight radials as you can. The radials

must be connected to the shield of your feedline. The DXE-RADP-3 Stainless Steel Radial Plate is

an ideal optional item which provides an excellent system for attaching radial wires to your vertical

antenna system feedpoint.

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Radial wires can be laid on the roots of the grass using DXE-STPL Radial Wire Anchor Pins to

hold them down. Using enough staples will ensure the wires will not be snagged by mowers,

people, or animals. Grass will quickly overgrow the radials and it will be virtually impossible to see

them. An article describing this process is available on the DX Engineering website in the Tech

Info section. Radials can also be buried just under the surface by using a power edger to make a slit

in the soil.

Assembly Notes

Note: JTL-12555 Jet-Lube™ SS-30 Anti-Oxidant must be used between all antenna

element sections. Jet-Lube™ SS-30 is an electrical joint compound to affect a substantial

electrical connection between metal parts such as telescoping aluminum tubing or other

antenna pieces. It ensures high conductivity at all voltage levels by displacing moisture and

preventing corrosion or oxidation.

Jet-Lube™ SS-30 must be used on all element clamps and stainless steel threaded hardware

to provide good electrical contact, prevent galling, allowing easier disassembly and to ensure

proper tightening.

Note: The following assembly instructions are based on using an optional DXE-

VGMT-3GC Mounting Pipe (referred to as 3” OD), with the optional DXE-

VR-1 Manual Winch, optional DXE-RADP-3 Radial Plate with one optional

DXE-SSVC-3P V Clamp, one optional DXE-UHF-FDFB-KIT -

SecureMount™dual SO-239 Bulkhead Connector and one DXE-FP-WIRE-

P Feedpoint Wire and Connector Assembly.

Radial Plate to Mounting Pipe

Place the optional DXE-RADP-3 Radial Plate over the 3" OD (maximum) mounting pipe. Attach

the Radial Plate to the mounting pipe using one DXE-SSVC-3P stainless steel V-Clamp. Allow

approximately one inch clearance between the bottom of the Radial Plate and the ground to allow

access to the radial wire mounting hardware (see Figure 1). Connections to the antenna will be

made via the optional DXE-UHF-FDFB-KIT SecureMount™dual SO-239 bulkhead connector.

The DXE-RADP-3 Radial Plate comes with 20 sets of stainless steel hardware for mounting the

radial wires. It is suggested that 32 radial each 65 feet long be used, therefore additional DXE-

RADP-1HWK Radial Plate Wire Attachment Hardware Kits will be required.

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Figure 1 - Optional DXE-RADP-3 Radial Plate Mounted to a 3" OD Mounting Pipe

Attaching Ground Radial Wires to the Radial Plate

Using the 20 sets of supplied 1/4" stainless steel hardware (Bolt, Star Washer, Flat Washer, Split

Washer, Nut) connect the optional ground radial wires to the DXE-RADP-3 Radial Plate as shown

below. Additional hardware kits are available (DXE-RADP-1HWK) that contain 20 sets of Radial

Plate Hardware.

There are optional DX Engineering Radial Wire Kits available. DXE-RADW-500K/BD contains a

500 foot spool of 14 gauge copper stranded wire with black PVC insulation, 20 Terminal Lugs and

100 Steel or Biodegradable Lawn Staples. The DXE-RADW-1000K/BD Radial Wire Kit contains

a 1,000 foot spool of 14 gauge copper stranded wire with black PVC insulation, 40 Terminal Lugs

and 200 Steel or Biodegradable Lawn Staples. RADW-20RT, -32RT or -65RT contain 20 each

radial wires with 1/4" terminal attached. These kits come in 20 Ft, 32 Ft or 65 Ft lengths.

Depending on the number of radial wires used, space them out evenly around the Radial Plate. The

Radial Plate will accommodate up to 60 radial wires (60 laser drilled holes), or up to 120 radials if

doubled up.

Radial Wire Pattern

Radial Wire Hardware Installation

- 8 -

Overall Heavy Duty

Pivot Base (US Patent No. 8,130,168)

Assembly Reference Drawing

The exploded view drawing

is for reference and shows

the overall Pivot Base

Assembly.

- 9 -

Pivot Base and Lower Antenna Assembly

1. Locate the heavy duty Extren®insulated channel.

There are 12 holes drilled in the insulated channel.

The top of the insulated channel is identified by two

holes located very near the top end.

2. Locate the stainless steel bottom hinge plate, backing plate, four carriage bolts, four 3/8" flat

washers, four 3/8" split lock washers and four 3/8" hex nuts. Assemble the bottom hinge to the

bottom of the heavy duty Extren®insulated channel as shown below.

3. Locate the stainless steel pivot base locking plate, backing plate, four carriage bolts, four 3/8"

flat washers, four 3/8" split lock washers and four 3/8" hex nuts. Assemble the pivot base

locking plate to the top of the heavy duty Extren®insulated channel as shown below.

Indice

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