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M108C
User guide
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Maco M108C User guide

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8 ELEMENT - 11 METER
MAXIMUM BEAM
M108C
www.macoantennas.net
MACO M108C
PACKING LIST
HARDWARE BAG #1 S01 5 2” PLATED SADDLES ____ S03 13 3” PLATED SADDLES ____
HARDWARE BAG #2 (DOUBLE BAG) U01 5 2” PLATED U-BOLTS ____ U03 13 3” PLATED U-BOLTS ____ N03 36 5/16” LOCK NUTS ____
HARDWARE BAG #3
BE3P 8 3” BOOM TO ELEMENT MOUNTS ____
HARDWARE BAG #4
EG2 6 EGG INSULATORS ____ W58P 16 5/8” EXTRUDED ALUMINUM CLAMPS ____ S21 21 10-24 ½” MACHINE SCREWS ____ N11 21 10-24 SQUARE NUTS ____ N12 4 #10 LOCK WASHERS ____ S28 1 ½” 3 ½”” HEX BOLT ____ N15 1 ½” HEX NUT ____ N16 1 ½” LOCKWASHER ____ N17 3 ½” FLAT WASHERS ____ N18 2 5/16” EYEBOLTS-W/ 2 NO1 NUTS EACH ____ PL2 16 .437 PLASTIC CAPS – BLACK ____ PL6 1 3” PLASTIC CAP – BLACK ____ PL6R 1 3” PLASTIC CAP – RED ____ Z02 2 GAMMA STRAPS ____ 1 TIP SHEET ____ 1 WARRANTY SHEET ____ 1 INSTRUCTIONS ____
Please note: In an effort to keep the price on Maco Antennas down, we have decided not to clean up all the burrs and rough edges on the parts. We recommend that you deburr and clean up each part with files, sandpaper, etc. so that they go together easily. We are aware this needs to be done but have elected not to do it to save you the money we would have to add to the price of the kit for this service.
Revised 1/09
DIRECTOR
SECOND DIRECTOR
REFLECTOR
ELEMENT
BLACK PLASTIC
DIRECTOR
THIRD DIRECTOR
RADIATION
PLASTIC CAP
(PLGR)
SIXTH
DIREC
DIRECTION
OF
/
RADIATION
RED PLASTIC CAP (PLGR)
P
63
1-k’
HORIZONTAL POLARIATION
REFLECl
DRIVEN
SECOND DIRECTOR
1
TOR
BLACK PLASTIC CAP P-6)
VERTICAL POLARIATION
FIGURE 1 GENERAL INSTRUCTIONS
This drawing shows a view of the antenna assembled.
M108C
may be used horizontally or
The vertically. These instructions and FIGURES 2 through 4 show the correct assembly instructions. It is highly recommended that rope be put in the elements to prolong their life. All hardware should be tightened securely, and then coated with silicon rubber sealant or similar compound to prevent loosening from wind vibration.
Take care to locate all parts accurately per dimensions given. Complete each step as instructed before
going on to following steps.
Upon completion of assembly, install the red plastic cap (PL6R) on the director end of the antenna, and the black plastic cap (PL6) on the reflector end. This will allow you to determine at a glance the direction of transmit and receive.
M108C
2
3” BOOM
THREAD GUY WIRE THROUGH EGG INSULATOR AND TWIST END
DIRECTOR
TWIST END OF GUY
HEX NUT
,EYEBOLT
’
y
1” FROM ELEMENT
‘TW:,END
3”
BOOM
OF
2
END OF GUY
,’ ,v”\.
VERTICAL GUY SUPPORT
LOCKWASHERS
HEX NUTS
BOOM
/
NOTE-
THIS CLAMP DOES
-, ,- m,
I I--
NOT ATTACH TO
*Y-F --
'ntrLH't.
PURE
29
FIGURE 2 BOOM ASSEMBLY
(See figure 2A.) First mark the center of the 2.832” O.D. boom coupler (T35P). Slide both of the
20’ sections of 3” O.D. tubing over the ends of the coupler so they both butt at the coupler center.
(See figure 2B.) Mark the center of the boom to mast plate.
Center the plate (P04) on the boom and secure with four of the 3” U-bolts (U03) and saddles (S03) and eight of the j/16” lockwashers (N02) and hex nuts (NOl). Avoid over-tightening the U-bolts as doing so may crush and weaken the boom. Now, reverse a 3” U-bolt so that it points away from the boom to mast plate. Slide on a 3” saddle, followed by the vertical guy support, then secure with
5/16”
lockwashers and hex nuts.
From the roll of guy cable (WD3), cut two lengths 2’ long. Take the two eyebolts (N18) and pass one end of the cable through the eye of the bolt and wrap. Pass the opposite end of the cable through the hole in the egg insulator egg insulator is
l’,
then wrap the cable. Make two of these, then place the eyebolts onto the guy support with
(EGl)
and adjust so that the length of cable between the eye of the eyebolt and the
one nut inside and the other nut on the outside of the vertical guy support. Tighten only finger tight at this time.
3
MlOSC
Please end of this instruction booklet before assembling elements.
I
read the Assembly and Troubleshooting Tips
at
the
I
BE3 CLAMP
\
b-BOLT
ELEMENT
NUTS AND
FIGURE 3A ELEMENT CENTER SECTION MOUNTING
Refer to the main sketch (Figures 1A & B) for spacing of the elements. Slide the
5/8”
x 6’ center sections inside the boom to element mounts. Mount these onto the boom with 3”” U-bolt assemblies as shown. Refer to Figure 4 (Gamma Match Assembly) before mounting the driven element and note the position of the coaxial connector assembly. Space the first saddle 1” from the end of the boom. Again, be careful not to over-tighten the U-bolts. Line up all the sections after mounting with a level or by any other accurate means. At this time, refer to Figure 2B and complete the boom guy support system.
Allow 6” of cable for the egg insulator wraps and 16” for the wraps around the boom at the boom to element mounts. Distances shown should be adhered to plus or minus 1”. Pull the sag out of the boom by tightening the outside nuts on the guy support, then lock the inside nuts against the guy support.
IO-24 x
IO-24 SQUARE
ELEMENT
l/2”
MACHINE
SCREW
W58 CLAMP
FIGURE 3B ELEMENT END SECTION MOUNTING
Assemble the
square nuts
(Nl
position of the
5/8”
W58
clamps as shown in Figure 2B. Thread the l/2” machine screw (S21) into the
1) only slightly at this time. Refer to Figure 4 (Gamma Match Assembly) and note the
metal clamps that will attach the gamma match to the driven position.
Insert the l/2” O.D. x 72” tubing (no slots) into the driven element and director center sections. Slide
on a W58 clamp assembly over each element and tighten slightly.
Assemble the reflector in the same manner by using the l/2” O.D. x 72” slotted one end sections.
At this time, refer to the element length chart on page 7 and set the element lengths. In setting element lengths, telescope the telescoped into the next larger size should be 3”. Measure overall element lengths, then push the
l/2”
O.D. into the
5/8”
O.D. by equal amounts. In any case, the minimum length
.437”
plastic caps (PL2) over the ends of the premeasured elements.
black
MlOSC
4
MOUNTING
I
The
M108C
is recommended. If mounted on a guyed tower, break up the guys every 3’ by using egg insulators in the guy lines for the top 20’ of the guy cables. Also, the guys should be located at least 12’ below the level of the boom.
of the tower, this should not be attempted unless you are certain that your installation is sturdy enough for
this type of installation. mounting it 2’ above the top of the tower, or by mounting a rotator so that it lies between the vertical elements. The first consideration should always be the mechanical stability of the antenna.
to give a tilt feature to the boom, if desired.
Although it may be desirable to mount the antenna on a mast so that the elements clear the top
The l/2” x 3 l/2” hex bolt, l/2” lockwasher, (3) l/2” flat washer cut and l/2” hex nut are provided
A hole will have to be drilled through your mast to accommodate the l/2” bolt.
Place the parts as shown below.
is designed to accept a 2” O.D. mast. A l/4” heavy duty mast designed for this purpose
Experimentation has shown little, if any, effect on the operation of the antenna by
BOOM TO MAST TILT FEATURE
T
NUT
r-BOOM
TO
MAST
PLATE
5
M108C
*
m:
THESE DIMENSONS ARE APPROXIMATE. REFER TO THE INSTRUCTIONS ON ADJUSTINNG THE S.W.R. TO DETERMINE EXACT SETTINGS. THERE ARE2 SEPARATEGAMMA ADJUSTMENTS, 1. CAPACI­TOR ADJUSTMENT, 2. SLIDER POSITION. DO NOT MOVE BOTH AT THE SAME TIME. MOVE THE CAPACITOR FIRST, THEN, IF NECESSARY MOVE THE SLIDER. AND GO BACK TO THE CAPACITOR.
521,
Nil,
itln-7A Y 1/y SCREWS
., .- -- - .,-
LK. NUTS
ZO2P
GAMMA STRAPS (SLIDER)
N12-7
;&SQ.
WSHR5 -
\
DRIVEN
,.N
ELEMENT
318”
24 NUT\
318
STAR-e-(
WASHER
521.
Nil.
‘\
I
I
_
\
-
318
318
#IO-24
LK. WSHRS & SQ.
PLASTIC SHOULDER
WASHER
FLATWASHER
N12
x
I/2”
SCREWS
CABLE (CUSTOMER FURNISHED)
-
GO1 P GAMMA MATCH
FIGURE 4 GAMMA MATCH MOUNTING
Mount the gamma match
(GOlP)
to the driven element, using the gamma straps (202,
ZOS)
and attaching hardware as shown. Attach your 52 ohm coaxial cable to the connector (S42) and dress along boom and down the mast. The gamma is shown pointing down - this is to let water out.
ADJUSTING THE STANDING WAVE RATIO
(SWR)
Refer to Figure 4. The dimensions given are approximate and should be used as a starting point. * The gamma match has 2 adjustments. First is the capacitor adjust and second is the slider adjust. Connect a SWR bridge coax between your transmitter and the antenna and check the SWR. If adjustment is required, loosen the clamp on the gamma match and the screws holding the slider (gamma straps (202)). Next move the capacitor adjustment first one direction, then the other until a minimum SWR reading is obtained. out 2” away from the boom.
Ifthe reading has gone up move the slider
If SWR is not yet satisfactory, move the slider
backto
the original position and
then2”
towards the boom. Now readjust the capacitor for minimum SWR. You should now be able to determine which direction to move the slider. Repeat the above procedure moving the slider in smaller increments until a satisfactory SWR is
obtained. Tighten all hardware. Disconnect the SWR bridge and reconnect your coaxial cable.
NOTE!
When assembling for vertical use, set antenna on a pole about 8 to 9 feet above the ground horizontally and
adjust SWR to 1.7. When you turn the antenna vertical and mount it on the tower, etc., the SWR will drop to 1.4 to
1.5. This is good; QUIT! Antenna results best if vertical antenna clears the top of the tower.
7
MlOSC
Installing and rigging towers, masts and antennas require specialized skills and experience. Information supplied by M similar products before. No one should attempt to install towers or masts without these knowledgeable skills.
MACO assumes no liability if faulty or dangerous installation practices are used. There are available, trained and experienced personnel to assist in installation, maintenance, or dissassembly. Contact your local installer if consultation or assistance is required.
All tower and antenna installations should be throughly inspected at least twice a year by qualified, experienced, and trained personnel to insure proper performance and safety standards.
An additional warning precaution is given to be careful of surrounding high voltage power wires and other electrical hazards duing installtion of your tower, rotor, or antenna.
ACO assumes that all products will be installed by personnel having these skills and have installed
Do not erect a tower, rotor, or antenna during an electrical storm, rainstorm, or when lightning is a possibility.
www.macoantennas.net
(815) 244-3500
MACO Antennas is a Division of Charles Electronics, LLC
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