MFJ MFJ-1768 Bedienungsanleitung

144/440 MHz Dual Band Yagi

Model MFJ-1768

INSTRUCTION MANDAL

READ ALL INSTRUCTIONS BEFORE OPERATING EQUIPMENT

MFJ ENTERPRISES, INC.

P.O. BOX 494, MISSISSIPPI STATE, MS 39762, USA

Red Cap

MEI-1768

Dual Band Yagi

36 3/8" (A)



3/8" (D)

Red

Block

Red

3/8" (D)

Boom

1/2" (E)

Yellow

1 1

Block

7/8"

(F)

37" (B)

White

5/8" (G)

6 3/8" x 1/4"

Tube

13 3/4" (H)

19 1/4"x 1/4"

/-1



Tube

L-Bracket

with Coax Connector

Green

Capacitor

Thin Plates

Ferrite Balun Beads

Green

U-Bolt and

Saddle Clamp

Red Cap

1/4 - 20 Nuts

and Split Wahers

NOTE:

This drawing is not to scale

U-Bolt and

Sacicle Clamp

MFJ-1768

Dual Band Yogi

Red Cap

3/8" (D)

3/8" (A)

_--

3/8" (D)

Boom

1 /2" (E)

7/8" (F)

3T (B)

5/8" (G)

Red



Red

Yellow

Block



White

} Block

White

6 3/8" x 1/4"

Tube

13 3/4" (H)

19 1/4" x 1/4

Tube

Green

Capacitor

Thin Plates

L-Bracket

with Coax Connector



Ferrite Balun Beads

39 3/4" (C)



Green

1/4 - 20 Nuts

and Split Wahers

NOTE:

This drawing is not to scale

MEI-1768 Dual Band Yagi



Instruction Manual

MFJ-1768

Instruction Manuil

Table of Contents

Introduction



Choosing a Location for the Antenna



Tools and Time Requiretnents



MFj-1768 Parts List



Safety Precautions



Assembly and Installation



Timing



Grounding Considerations



Maintenance



Technical Assistance



ME1-1768 Duval Band Yagi



hist

niet

ion Manna'

MFJ-1768

Instruction Manual

1NTRODECTION

The MO-1768 is a National Bureau of Standards (NBS) style yagi that provides optimum gain and

front to back ratio on both the 2 meter and the 70 centimeter bands. On the 2 meter band the MFJ-1768

is a 4 element antenna, on the 70 centimeter band the MR1-1768 is a 7 element antenna. It is constructed

using lightweight and strong 6061-T6 aluminum material for both the elements and the boom. The MFJ

1768 elements are insulated from the boom to eliminate the problem of poor electrical contact to the

boom. This antenna uses a dual balante driven element that provides a clean pattern with minimal

skewing. The antenna's 1/4" diameter driven elements provide wille bandwidth that covers both bands

with a low SWR. This antenna uses a single feedline with a ferrite decoupled current balup for both

hands. This technique eliminates the need for extra coax tables, and stops all the parallel RF current. on

the coax shield. This prevents unwanted radiation.

The MH-1768 is an excellent antenna for use with dual band transceivers. Since the MD-1768 is a dual

band antenna there is no need to switch antennas when changing bands. With the use of a duplexer

(such as the MD-016) you can connect two different radios (two different bands) to the ML1-1768 at

the same time.

CHOOSING A 1,OCA1 ION FOR THE ANTENNA

The NIFJ-1768can be mounted on any 1" to 1 1/2" mast

(conduclive or non-conduclive)

capable of

supporting the weiglit of the antenna and the torque developed by the boom. The MFT-1768 can he

mounted vertically (generally used for FM transmission), or horizontally (commonly used for SSB

transmission).

The best performance on receiving and transmitting will be obtained by mounting the antenna as high as

possible in a clear location above or away from buildings, feed biles, utility wires, and other antennas.

Your ingenttity and particular circumstances will determine the final mounting method.

The MD-1768 is a directional antenna with a major high gain forward lobe and fewer lover gain side

and back lobes. The operating frequency of this antenna is used only in line of site communication. For

that reason it is best to molmt the MD-1768 on a rotor and be able to orient its major lobe toward the

desired location and obtain maximum performance. Also since the side and the back lobe exist but with

low gain, it is possible to use these lobcs for local area communication without rotating the antenna

N1FJ-1768 I)ual Band Vagi



Instruction Mantra!

TOOLS AND TIME REQUIREMENTS

The estimated time of assembly for this antenna (including reading time) is 1 hour.

Tools required for this antenna are as follows:

#1 Phillips screwdriver

1/4" nut driver

7/16" open end wrench

Push nut assembly tool (supplied)

Eye protection

Temporary mast and a table, or flat ground

MFJ

1768 PARTS LIST

The MH-1768 parts and hardware are stainless steel, aluminum, or non-corrosive material.

As you unpack your antenna you should Eind the following list:

[ ] One bundle of long elements for the two meter band

[ J One bundle of short elements for the 440 Mhz band

()ne bag containing the following, hardware:

Twenty 3/16" ID insulators

30 push nuts 3/16" ID

Two 1 1/8" red end caps

One U-bolt and saddle damp assembly

Push nut assembly tool

Vwo capacitor thin plates for 2 m elements

Two 4-40 x 1/2" SST screws

Ten 4-40 SST nuts

One 1 1/8" diameter (6061-T6) aluminum tubing boom

SAFETY PRECAUTIONS

WARN NG

This antenna is an electrical conductor.

(.:ontact with power lines can .result in de th, ot serious injuries.

:not



this antenna- witere there is any possibilitv OI contact witli power rables Or.

serNiee drop to buildings.

The: antenná stippOrting mast andlor tower should not be

elose to any power lines

during

installation Or

tiloval in theevent the system stronk! accident:Lily rail.

- Fellow the guidelines for antenna in.stallation recommerided hy the



consumer

product safety

commission.

MEI-1768

Dual Band Yagi



Instruction Manual

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ASSEMBLY AND 1NSTALLATION

During assembly of this antenna refer to figures in this manual and the picture on the front cover. The

assembly instructions tell you, step by step, how to install the insulators, the drives and parasitic

elements, and the U-bolt assembly.

All parasitic elements, for 2 meter and 70 cm band, are colon coded at their ends and alphabetically

labeled on ligure-1 and on ligure inside tiont cover to facilitate the antenna assembly_ Pay extreme case

while assembling the antenna and ahvays refer to the mentioned figures.

Step by Step Procedure

Prepare a strong mounting mast that can withstand a wind load of at least 2 square Peet and permit

easy installation. Set up a table or other stable support.

Sort out party you have unpacked info groups of similar Aarts. These consist of

1 1

twenty 3/16" ID black insulators

[]30 push nuts 3/16" ID

[1 One U-bolt assembly

[ 1 Two capacitor thin platen for 2 in elements

Two 4-40 x 1/2" SST serews and ten 4-40 SST nuts

0119 1 1 /8

" diameter (60(>1-

V) aluminum tubing boom \ ith matching network and SO-239

connector on an "1," bracket

(pw-ctss

embled)

[

One bundle of long elements ffir the two meter band

GROUP

Two 19 1/4" x 1/1" long tubes

One 3() 3/8"



_Block

One 37" long



....... _White

One 39 3/4" long....



.Green

MFJ-1768 Dual Band Yagi



Instruction Manaal

[ ] One bundle of short elements for the 440 MHz band (eiglit of them)

GROUP 2

Two 6 3/8" x 1/4" short tubes

Two 11 3/8" long



Red

One 11 1/2" long



Yellow

One 11 7/8" long



Black

One 11 5/8" long



White

One 13 3/4" long



Green

Group 1

Group 2

6-3/8" (2)

19-1/4"(2)



F3lock



36-3/8'



Red



11-3/8"

A ,---



37''

B '

White ---1



■

Yellow--



11-1/2"



39-3/4''



5/8

11-7/8"

Green

C-2.----



Block

---1

Whtle

i 13-3/4"

Green '

3- Insert eighteen of the 3/16" ID black insulators using your thumb into the designated holes on the sides

of the 1-1/8" boom.

F1G URE

kek"

to ligare on inside front cover and ligure 2 to loeide the designated holes and the installatimij

example

I,ay the antenna boom on a flat stal

ace, a table perhaps, with the feed plate faeing up.

5- Refer to Figure 3 and start the assembly of the driven elements as follows:

The 2 meter driven element:

Align the holes drillecl on the end of a 19 1/4" x 1/4" tube with the 1-10 screws located on the

rear end of the feed plate (



3for

exacl localion ).

Insert the 4-40 screws into these

holes. Thread 4-40 mits over the two screws and tighten to ensure goud connections. Repeat

the same procedure for the remaining 19 1/4" x 1/4" driven element.

1 1 /8 '

The 441) :1111.: drive', element:

Align the holes drtiled on the end of a 6 3/8"" x 1/4" tube

with the 4-40 screws located on the front end of the feed

plate



see

fiKure

3 ffir exact location )



Insert the 1-10

screws Mto these !mies



T hread 4-40 nuts over the two

screws and tighten to ensure Bood connections Repeat the

same procedure Hu the lemainimi h 1'8" x 1,i4" driven

element,

tik,C1hr



tof

IFIGURE 2

63/8" x 1/4

70 Centimeter

Driven

Element

Instruction Nianual

MFJ-1768 Dual Band Yagi

4-40

nut

19 1/4" Y. 1/4"

Tube

Feed Plato

4-401ockinQ riuls

19 1/4" x 1/4"

2 Met et

Driven Element

FIGURE

•

—

40 scres,w

(.apaciter

11)in plats

6 3/8' x 1/4'

Tube

Refer to figure 4 and figure 5 and start the assemhly of the parasitic elements

6- Assemble one push nut on each of the parasitic elements of both groups (fabeled

A-11)

using the

provided Jool.

Slide the push nut until it reaches the first mark en the element (see figure 4

)

WARN ING:

1f 3,ou pasled the mark, do not ny to slide the push nut haekward Sliding the

push nut baekward wilt tend to losrage it

instead slide the push nut all tie

way

out

titen

reinstall it. Nole: Extra push nuts are providedfor replacement of damaged ones.

Note : for section 7

and 8 refer to figure 1, figure 4 and figure 5 while assembling

Insert element "A" ( black end ) from GROUP 1 into its

designated hole in the boom, as shows in the ligure en the

inside front cover. Assemble another push nut from the other

side ( see ligure 4 and figure 5 ), and slide it until it reaches the

3/16" black insulator. Make sure that the element is secured

place with minimum free play .

Repeat the previous procedure for the remaining elements

from GROUP 1 and GROUP 2. See inside front cover and

figure 1 for 'bil detail en hole positions, elements locations,

colon code, and alphabetical label

After installing all the parasitic elements

insert

the lj-bolt in

its designated holes keeping in mind the polarization of the

antenna (see figure 6).

Push Nut Push Nut Tool

Do not slide

push nut backwards

FIGURE 4

1/4 - 20 Nuts

and

Split Washers

Boom

Mast

Saddle Clamp

1111111111111111111111111.

1111iIII111

■

111111!1111

MEI-1768 Dual Band Yagi

list ruct ion Manna!

Insuiator

Push Nut

Element -

FIGURE

FIGURE 5 1

10-

Lay the antenna on a flat surface to install the thin capacitor plates for the 2 meter driven elements.

Insert. a 4-40 x 1/2" scrcw through the hole located in the middlc of the element, pass it through a thin

capacitor plate. Thread a 1-10 nut on the screw and tighten. Repeat this procedure for the second

driven element (sec Figure 3).

IMPORTANT: Make sure the capacitor thin piate font] a 90 degrees angle with the 2 meter

driven elements

11-

The antenna is ready now to be mounted on the permanent mast and ready to be used ()n the air.

Note:

Make sure to dress the feed coax eable along the boom and run it along the permanent

mast. llold it. in biace using either electric tape or black cabie ties

TUNING

The ME1-1768 is pre-tuned on both bands, additional tuning is not required. The antenna bandwidth is

verg wide, it covers the entire 2 meter and 70 centimeter band with an SWR less than 2.0:1.0.

GROUNDING (1):11)EIZ.V1 (ONS

Althou2h this antenna is designed to operate efficiently without the requirement of an carth ground,

SAFETY GROENDING MUST STIL!, 13E PROVIDED to proleet equipment, property and persons

from the hazards of lightning strikes and other weather related electrical discharges. In addition the.

coaxial cable feeding the officium should ha\e the shield

esotincled to eliminate the risk of any

Indom

equipment failure trom allowing hatardous voltages 1rolll appearing indoors and creating a shock

hazard.

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