M2 Antenna Systems KT34M2 Bedienungsanleitung

M2 Antenna Systems, Inc. 4402 N. Selland Ave. Fresno, CA 93722

Tel: (559) 432-8873 Fax: (559) 432-3059 Web: www.m2inc.com

11/14/18

Rev.03

Model .........................................KT34M2

Frequency Range.......................14.0-14.350 MHz

Frequency Range.......................21.0-21.450 MHz

Frequency Range.......................28.0-29.0 MHz

*Gain in free space.....................See Chart

Front to back ..............................See Chart

Feed type ...................................“T” Match

Feed Impedance........................50 Ohms Unbalanced

Maximum VSWR........................1.5:1

Input Connector..........................SO-239, Others avl.

Power Handling..........................3 kW, Higher avl.

Boom Length / Dia......................16’ / 3.0 x .065 Wall

Element Length / Dia..................25’ / 1” To 1/2”

Turning Radius:..........................15’

Stacking Distance.......................37’ To 43’

Mast Size....................................2” to 3 ” Nom.

Wind area / Survival...................4.5 Sq. Ft. / 100 MPH

Weight / Ship Wt.........................40 Lbs. / 62 Lbs.

M2 Antenna Systems, Inc.

Model No: KT34M2

FEATURES:

The KT34M2 is now the best performing and strongest short tribander available today. All four elements resonant

on each band. A dual driven element allows a beautiful flat match, broad gain, and high front to back curves across 10,

15, and 20M. A 3kW 4:1 balun efficiently matches the antenna to 50. All sheet metal parts has been upgraded to our

new machined shorting bars, stiffening and strengthening the antenna noticeably. The long term performance is en-

hanced by the total contact machined joints. This antenna will be competitive with most monobanders! Be surprised, get

the NEW KT34M2.

SPECIFICATIONS:

10m

f, MHz G, dBi F/B, dB

28.0 7.3 18

28.2 7.3 23

28.4 7.4 25

28.6 7.5 24

29.2 7.6 20

15m

f, MHz G, dBi F/B, dB

21.0 6.9 19

21.1 6.9 22

21.2 7.0 24

21.3 7.0 24

21.45 7.1 23

20m

f, MHz G, dBi F/B, dB

14.0 6.5 17

14.1 6.6 24

14.2 6.7 21

14.35 6.8 23

*Subtract 2.14 from dBi for dBd

Tools: Phillips head screw driver, ‘green’, 11/32” nut driver, 7/16” wrench, 7/16” socket, socket wrench,

tape measure, and a friend.

NOTE: To prevent galling of the stainless steel hardware, apply a light coating of Penetrox to all bolts

and screws. The term ‘SWAGE’ refers to a physical reduction made in one diameter of tubing in order to

fit into or over another.

1. SHORTING BARS

Included with this kit are five different shorting bars, pictured in Figure 1. First locate the 10m shorting bars and

shorting bar insulators (black or white). For each 10m shorting bar press a single shorting bar insulator into the

large hole. This can be done initially with a vise or with a hammer and a block of wood. After the insulator has

been partially set into the hole, take two element clamp plates and center the shorting bar on top of the two

plates. Now place the block of wood on top of the insulator and give a final strike. You should hear a snap. This

is the indication that the insulator has been

secured. Next install the 8-32 hardware listed to

the right of each part into each respective

shorting bar. Remember to apply a light coating

of Penetrox to the threads of each screw. Finger

tighten each locknut for now. Locate the small

container of Penetrox and for each shorting bar,

apply a light coating to the walls as indicated in

the figure.

2. CAPACITOR TUBE ASSEMBLY

There are three sizes of capacitor tubes. Tube

sizes 8”, 9” and 10” are for the 10m capacitor

while the 16” pieces are for 15m. NOTE: THESE

CAPACITOR TUBE SHOULD BE VERY CLEAN

INSIDE. PUSH KLEENEX OR EQUIVALENT

THROUGH AS REQUIRED TO REMOVE

CHIPS, OIL ETC. Locate the bag of capacitor

caps. As shown in Figure 2, starting with the 8”

tube, slide on the long 10M shorting bar about an

inch. Then lay a capacitor cap on a flat surface

and with your own weight/strength, press on a

cap. Turn the tube over, and install another cap.

Each capacitor cap will engage the 3/4” tube

3/8”(.375) so a measurement can be taken to

insure complete engagement of the caps to the tube, simply measure between the inside edge of the two

installed caps, it should be 5/8”(.625) to 3/4”(.750) shorter than the capacitor tube being measured. Repeat this

procedure for the 9” and 10” capacitor tubes For the 16” tubes follow the same procedure but slide on a different

shorting bar as shown in the figure.

Figure 1

KT34M2 ASSEMBLY MANUAL

3. CAPACITOR ASSEMBLIES ONTO LONGER 3/8” TUBES

Locate the (8) longer 3/8” diameter tubes. Upon inspecting the tubes, you’ll notice there are two holes

drilled on one side only. These holes equalize the atmospheric pressure in the capacitors and prevent

moisture build up inside the capacitor tubes. Denote the hole side of the tube by making a identifying

mark NEAR the tube end, with a pen or marker. Following the information in Table 1, make another

mark on the hole side of the tube indicating the location of where to initially center the two capacitor

tubes (about 1/4” apart) As shown in Figure 3 below, make this measurement from the side that has

the shorter distance from hole to tube end. Now pair up the capacitor assemblies with the correct 3/8”

tube sizes using the first three columns of Table 1.

For each set of capacitor tube assemblies and 3/8” tubes, insert the 3/8” tube as shown in Figure 3

into the back end of the 15m capacitor assembly. Move the capacitor up the length of the tube until

the face of the black capacitor cap ON THE SHORTING BAR SIDE of the capacitor assembly is within

1/4” from the mark you made. Now slide on the 10m capacitor tube assembly up the length of the

tube in the same fashion, making sure that the face of the capacitor cap is at the mark. There should

now be about 1/4” separation distance between the two capacitor assemblies. If the caps are tight

together moisture can stay there a long time increasing the chance for water to migrate inside the

capacitor. This is bad as water in any capacitor will cause VSWR problems.

ELEMENT 10m CAPACITOR

TUBE 15m CAPACITOR

TUBE 3/8” DIA. TUBE

CENTER CAPACITOR

TUBES ON 3/8” DIA TUBE

REFLECTOR 10” 16” 80” 29”

REAR DRIVEN 9” 16” 80” 28”

FRONT DRIVEN 8” 16” 74” 28”

1ST DIRECTOR 8” 16” 72” 26-1/2”

TABLE 1

KT34M2 ASSEMBLY MANUAL

4. GENERAL ASSEMBLY OF HALF ELEMENT SECTIONS

We recommend assembling the half element sections on a

clean, flat surface. There is an “DIMENSION/ ASSEMBLY”

drawing for each of the four elements with both the right

and left halves shown on each page. We also recommend

briefing yourself with the general directions before

skipping to the assembly drawings.

The general assembly procedure for a half element section

begins with laying each capacitor assembly on a level surface,

with the 10m capacitor tube on the left hand side. Locate the

two swaged 3/4” diameter tubes and the 5/8 x 6” fiberglass

rod. NOTE: BE SURE TO USE THE CORRECT LENGTH 3/4”

SECTIONS MATCHING UP WITH THE 10M CAPACITOR

LENGTH. Insert the fiberglass rod into the LIGHTLY

swaged end side of the longer 3/4” section. Align the two

holes and secure loosely with a single 8-32 x 1” screw and lock

nut in the outer hole as shown in Figure 4. Next slide the

other end of the fiberglass rod into the center hole of the 10M shorting bar connected to the 10m capacitor. Now

slide the lightly swaged end of the shorter 3/4” x 12” tubing through the hole of the shorting bar connected to the

15m capacitor tube. Secure with a single 8-32 x 1” screw and locknut, again through the “OUTER HOLE” in the

figure. Now insert the inner two 8-32 x 1” screws and locknuts, and tighten LIGHTLY. NOTE: IF YOU OVER

TIGHTEN, YOU MAY NOT BE ABLE TO MOVE THE SHORTING BARS TO THE FINAL POSITION. Slide the

two shorting bars right up against the two inner locknuts as shown. Now tighten all four inner and outer screws

and locknuts. Position the capacitor tube assembly so that the gap rests in between the two shorting bars and

MAKE SURE THE MARKS YOU MADE ON THE 3/8” TUBE ARE UP. Tighten all of the 8-32 hardware installed

to this point.

Locate the appropriate 1/2’ element tip section and insert the end with two holes into the 3/4 x 12” swaged end.

Secure the 1/2” tip with two 8-32 x 1” screws and locknuts. With a tape measure hooked to the inner edge of the

15m capacitor tube shorting bar, make a mark on the 3/8” tube at the dimension called out for the 15m shorting

bar. Slide the 15m shorting bar onto the 3/8 and 1/2“ tube and set the inner edge if the bar to the mark. Install

two 8-32 x 1” screws, add locknuts, align with the other two bars, and tighten.

Locate the 10m shorting bar and the shorter 3/8” tube. Using a tape measure connected to the inner edge of the

10m capacitor tube shorting bar, mark the dimension called out for the 10m shorting bar. Slide on the 10m

shorting bar, set the inner edge to the mark and tighten the top 8-32 screw. Now insert the shorter 3/8” tube

through the other hole on the 10m shorting bar and into the free hole on the 10m capacitor tube shorting bar.

Allow the tube to extend 1” past the shorting bar connected to the 10m capacitor and tighten the 8-32 hardware

on both of the shorting bars.

Using the general directions above and the four TIP DIMENSION assembly drawings, proceed in fabricating the

8 half element sections. After double checking your dimensions and making sure that your elements are labeled

correctly proceed to the next step.

KT34M2 ASSEMBLY MANUAL

48.50”

KT34M2 ASSEMBLY MANUAL

47.25”

26.75”

KT34M2 ASSEMBLY MANUAL

43.75”

25.00”

KT34M2 ASSEMBLY MANUAL

44.00”

KT34M2 DIMENSION SHEET

48.50”

26.75”

47.25”

43.75”

25.00”

44.00”

5. HF CLAMP PLATE PAIR ASSEMBLY

Locate the 8 element clamp plates, the Balun ‘L’-Bracket, 2-1/2” U-bolt & Saddle, and element clamp cap.

Assemble the plates into four pairs with the radii facing each other using four 1/4-20 x 2” bolts. On one of the

‘alike’-pair combinations, attach the Balun ‘L’-Bracket to the outside clamp plate with the flat side up and higher

than the plates. Install the 2-1/2” U-bolt & Saddle combination on the top side of the ‘L’-Bracket and add the

5/16” nuts and lockwashers. This assembly will be used for the FRONT DRIVEN ELEMENT. Finger tighten all

the hardware.

6. FRONT AND REAR DRIVEN ELEMENT ASSEMBLY

Take the element clamp plate pair assembly for the FRONT DRIVEN ELEMENT (previous step) and one of the

‘alike’ element clamp pairs, and for both insert a 7/8 x 14-3/4” fiberglass rod through the plates. Orient the four

holes up and make sure the rod is centered. Tighten the four bolts evenly on the clamp plates. Locate the four

7/8” poly disc insulators. Slide a poly disc onto both ends of each 7/8” fiberglass rod and position them right up

against the element clamp plates. They are supposed to be tight so if the discs won’t fit onto the rod, try soaking

them in HOT water for a few minutes. Locate four of the 1 x 72” SOE (swaged one end) tubes. Select two to be

used for the FRONT DRIVEN ELEMENT. Locate the two ‘T’-match shorting bars and slide one about 2 feet onto

each of the straight ends of the 1” tubes you have selected. The other pair of 1 x 72” SOE tubes will be for the

REAR DRIVEN ELEMENT. For all four 1” tubes, slide the straight ends on both sides of the two fiberglass rods.

Align the holes, insert two 1/4-20 x 2” bolts up through the bottom, and temporarily lay the two assemblies flat.

Locate the eight 3/8” clamp blocks.

Spread a little Penetrox on each clamp

block face. Slide two clamp blocks with

their faces towards one another onto the

1/4-20 bolt posts on each element

assembly and thread on the 1/4-20

locknuts. Do not tighten the locknuts at

this time.

7. REFLECTOR, AND DIRECTOR #1

INNER SECTION ASSEMBLY

Locate the remaining four 1 x 72” SOE

(swaged one end) tube sections and the

two 7/8 x 36” aluminum center sleeves.

With the two remaining pairs of element

clamp plates, insert a 7/8” center sleeve

and slide onto both sides of the sleeve, a 1

x 72” tube section. Align the two holes

and secure with 1/4-20 x 1-1/2” bolts and

locknuts. Orient the tubes so that the

locknuts are down and centered. Tighten

the 1/4-20 hardware evenly. A gap

between the two tube sections is normal.

8. BOOM ASSEMBLY

Prior to assembling the boom, inspect each mating surface and holes for any metal chips or burrs. Apply a light

coating of PENETROX to the swaged ends of each piece. Using the DIMENSION SHEET as a guide, lay out

the three 3” pieces as shown. Note that the single straight section is the FRONT end of the antenna. Now

assemble the boom and secure the pieces together with 1/4-20 x 3-1/2” bolts and locknuts. Tighten until no

movement is felt at each joint.

9. ELEMENT INSTALLATION

We advise that you elevate the antenna boom onto a couple of sawhorses or bucks for the remaining assembly

steps. Use the DIMENSION SHEET as a guide to properly install the elements onto the boom. If you have not

labeled which side of the element faces towards the front of the antenna, you will want to pay close attention to

the DIMENSION SHEET. In fact, you might want to label them now. You also might want to have a friend handy

to keep the antenna from moving on you.

Place the REFLECTOR ELEMENT onto the boom in the orientation shown on the DIMENSION SHEET. Set the

outside edge of the element clamp plate 2-1/2” from the rear of the boom. Locate two 3” saddles, apply

zinc paste or grease to the threads and insert two 1/4-20 x 3” bolts through each of the holes. Next attach the

two saddles to the underside of the element clamp plates, and lightly tighten the entire assembly, so the element

won’t move. Using a tape measure hooked to the outside edge of the clamp plate facing the rear, mark off the

KT34M2 ASSEMBLY MANUAL

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