INSTALLATION AND ASSEMBLY
ANTENNA PRODUCTS, INC.
99 NORTH WILLOW ST. FELLSIVIERE FL 32948
Congratulations on your purchase of the GAP TITAN antenna. You soon
will enjoy the ultimate in vertical antenna technology. Your GAP antenna
has been designed and manufactured to provide superior performance, and
a long trouble free life.
GAP technology produces highly efficient, wide bandwidth performance.
As a result, no tuning is required in most amateur installations. This
manual is organized to minimize the amount of time necessary to assemble
and install your GAP vertical. It is recommended that you follow the instructions
and use the figures as a guide.
Before beginning assembly, take a few minutes to read through the site
selection chapter and to review the SAFETY notices. Please refer to Figure
1, the TITAN Antenna, as you proceed with the assembly. Locate the parts
from Figure 2.
The TITAN has been designed to operate efficiently on eight
bands at 1500 watts PEP or less. The TITAN cannot be run continuously i.e.
Amtor, RTTY at maximum power on 75/80 meters.
The use of an antenna tuner is not required. Tuners will not improve
the performance of the TITAN, however they may permit a solid state transmitter
to put out increased power. Operation of an antenna tuner when the VSWR
is 2:1 or less is permitted. High power operation outside the specified
bands using a tuner can damage the antenna.
CHAPTER 1: SITE CONSIDERATIONS SAFETY - nearby structures,
READ THE SAFETY NOTICE ON PAGE 1 BEFORE CONTINUING
CHAPTER 2: ANTENNA MOUNTING - Pole, tower, or chimney
CHAPTER 3: MAST ASSEMBLY - Space required, Mast Assembly, Step by Step
CHAPTER 4: TUNER ROD ASSEMBLY - Top, Mid, Lower and Extensions
CHAPTER 5: COUNTERPOISE AND MOUNT ASSEMBLY
CHAPTER 6: INITIAL TEST - First operation ... a place to record VSWR
CHAPTER 7: TIPS AND TROUBLE SHOOTING
WARNING! POWER LINES
CAN KILL. DO NOT ERECT THIS ANTENNA NEAR ANY OVERHEAD WIRES, UNDER ANY
CIRCUMSTANCES. READ AND FOLLOW THESE INSTRUCTIONS CAREFULLY:
Do not erect this antenna near any overhead wires. Assume all such wires
to be power lines and deadly.
Do not transport this antenna from an assembly location to the installation
site, if you must travel near or under overhead wires.
Request advice from your local power company, if power wires are anywhere
near the proposed installation.
If the antenna falls, do not try to stop it. Get out of the way.
If any part of the antenna should touch overhead wiring, DO
NOT TOUCH IT! Call the power company immediately for
In the event of an accident involving power wiring: DO
NOT TOUCH THE VICTIM DIRECTLY. Send someone for help.
Select a site which limits public access to the antenna. During operation
the lower tuner rods can be at High RF potential. If any possibility exists
that people or pets could touch the antenna, place a small wooden fence
around the antenna after installation.
Choose a calm, dry day to erect the antenna.
Always enlist the aid of at least one person in erecting the antenna.
Do not use or stand on a ladder in the process of erecting your GAP Antenna.
A ladder is not needed and could be dangerous.
Do not connect the antenna coax until the antenna is firmly mounted.
CHAPTER 1: SITE CONSIDERATIONS
General Ideally, it is best to locate the TITAN in a clear area, away from
wires, metal buildings, fences and trees. As a practical matter, many amateurs
must compromise in locating their antennas. This section contains specific
guidelines to assist in making those compromises.
If you have not read the safety notice, do so now. Stay away from power
lines, they are life threatening.
Choose a site that it is not easily accessible to people or pets. CONTACT
WITH THE ANTENNA IS DANGEROUS AND CAN BE FATAL. The counterpoise rods and
the rest of the TITAN may be at high RF potential during operation. If
it not possible to site the TITAN to prevent access, then it should be
placed high enough such that people cannot reach it or surround it with
Nearby Wires and Antennas
In general, any vertical antenna can exhibit mutual coupling with any other
vertical metal structure or wire if placed within a few wavelengths or
the structure approaches resonance at the operating frequency.
Try to avoid metal objects which may be within 30' of the proposed GAP
installation site. These may include wires, towers, downspouts, screened
porches, feebleness from other amateur antennas or TV antennas, metal pipes
on your property or adjoining properties. Naturally, if these metal objects
are short you can get closer than 30'.
Nearby horizontal wires or structures may affect the performance of a vertical
antenna, but they are not as likely to, as a vertical structure is.
It is best to locate the antenna as far from the home as possible, to minimize
interaction with house wiring, and RFI to consumer electronics.
Metal walled or roofed buildings can affect antenna operation. If you have
no choice, your GAP should be located at a corner of the building rather
than broadside. In any case, the TITAN should be tested first away from
the building. See Section 6.0.
Stucco buildings may have metal mesh in their walls and should be viewed
as a metal structures, until proven otherwise.
Mobile homes or RV's are a special case, which involve individual experimentation.
Test the antenna on the ground before attempting installation near or on
the RV. Mounting above the roof line is preferred.
The TITAN is designed to withstand substantial winds unguyed. Guys
are a form of insurance, however, which we recommend. Four nonconductive
guy ropes should be fastened above the center insulator. Use a stainless
clamp or optional guy clamp available from GAP. Leave some slack to allow
for temperature changes. Guys should be used for roof mounting. Do not
rely on a chimney mount or tripod to support the TITAN, even moderate winds
can produce enough force to damage the mount or the chimney.
CHAPTER 2: ANTENNA MOUNTING
The TITAN will accommodate a variety of mounting situations, some of
which are described below. The preferred mount is a pole mount. It is simple
and avoids the hazards of a roof top installation. Electing to roof mount
the antenna is solely your decision and extreme caution should be exercised.
If you elect to elevate the antenna, always pre-test the antenna on the
ground first. See Section 6.0 Locating a loose connection when the antenna
is on top of a 40' mast is not easy!!
The TITAN is designed to be pole mounted. A mount plate assembly has
been provided to attach the TITAN to a pole of your choice. It is recommended
that you select a very heavy gauge steel pipe. The outside diameter of
which should be 1.25". This pole may be attached to the side of a structure
i.e. house or garage for additional support. If you elect to side mount,
be certain your pole extends above the roof line to allow clearance for
the Counterpoise hoop. Three foot clearance is typical.
If you elect to mount the TITAN on a pole in the yard, the pole should
be mounted in an 18" diameter hole 3 feet deep or more and filled with
concrete. It is far easier to erect the antenna with your support pole
attached, rather than trying to lift the TITAN onto your support pipe.
Thus your support pole should be such that it is removable from the concrete.
T achieve this, procure a 3' length of 1.25" schedule 40 PVC. Make sure
it will sleeve over your support pipe, if it is not large enough slit the
pipe lengthwise and slide it over your pipe. Cover the slit with tape and
place the PVC covered pipe in the 3' hole and fill with concrete. When
the concrete has set remove your support pipe. You can now drop your support
pipe into the hole you created by your PVC form.
The TITAN may be mounted to a tower. Do not clamp directly to the tower
Use the Mount Plate Assembly to insulate the TITAN from the tower itself
1 the support. The TITAN must be placed at the top of the tower and not
parallel with it. You may experience reduced bandwidth on a band if you
tower mount the TITAN. This is generally a result of the tower exhibiting
a resonance for that frequency.
The TITAN may be mounted in a tripod or to a chimney mount. Use the
'mount plate assembly to insulate the TITAN from the tripod or chimney
The TITAN and mount are in excess of 29' tall. Under no circurnstances
should a tripod or chimney mount exist without guy ropes. Guy
CHAPTER 3: ASSEMBLY
The assembly of the GAP TITAN requires no special tools and a nut driver
has been supplied for your convenience. Plastic stand-offs that support
the tuner rods are attached to the aluminum mast at their approximate proper
positions to simplify assembly. Do not remove these at this time. Before
starting assembly, check the various parts in the shipping container against
the pictorial parts list in figure B to establish all parts are present.
Next review Figure A which depicts an assembled TITAN. As you proceed to
assemble your Titan, use this diagram.
NOTE: That in the assembly instructions,
when a single hole is identified on a tuner rod it is through drilled.
through drilled holes provide you with a backup should you accidentally
strip a hole by over tightening.
We found that telling you to insert a screw and washer gets repetitive,
therefore. whenever a screw is called for include a washer as well. When
attaching jumpers and transitions, the washer should be placed between
the ring terminal -and the tube. Not between the screw head and ring terminal.
When we refer to the "GAP" we are referencing the center insulator with
the yellow band.
To get started with the assembly, you will need a flat space approximately
30' in length. A driveway or patio surface is ideal. The key to an easy
assembly is room. to move, a surface which allows you to find the screws
you drop and careful attention to the directions. Extra screws have been
provided because we know how lawns like to eat screws.
Standoffs are positioned on the various mast sections at their approximate
final positions. Do not loosen the clamps.
Locate the Main Section. Place the Main Section on a flat surface. Stretch
out the coax that protrudes from each end. NOTE The coax that goes to the
top of the antenna has a yellow ring terminal.
Locate the Top Section. Place the end without the notch over the coax cable
with the yellow terminal.
Slide the Top Section into the Main Section. Gently push the Top Section
into the Main Section beyond the matching holes, until the yellow terminal
and spade connectors are exposed.
Plug the CAP unit onto the spade connectors found on the coaxial cable.
Make sure the male spades on the CAP unit align with the female
spade terminals on the coax.
Pull the Top Section back out and align it's four screw holes with the
four holes in the Main Mast Section. Insert 4 screws and tighten securely.
Place the yellow ring terminal at the top of the antenna through the slot
and over the nearby drill hole. Insert a screw and tighten securely.
WARNING: Make sure the CAP unit is pushed down below the screw,
so it does not crack the CAP unit when you insert it.
Locate the black dust cover and place it over the Top Section.
Locate the Mid Section. It has 4 standoffs attached to one end. Slide the
end with the 4 standoffs over the coax tail protruding from the Main Section
Align the holes on the insulator with the holes in the Mid Section. Insert
4 screws and tighten. Leave the standoffs as is for the moment.
Locate the Lower Section. It is a double wall section for added strength.
It has four long standoffs at one end.
Slide the end with the standoffs over the coax tail and partially over
the Mid Section. Align the 4 holes, insert 4 screws and tighten securely.
CHAPTER 4: TUNER ROD ASSEMBLY
There are four 102" Mid tuner rods, two Lower tuner rods 30" and 60"
and one 51 " Top tuner rod. Two extender rods complete the tuner rod package.
The standoffs have been pre positioned at the factory for your convenience.
When orienting these standoffs you should not have to move them along the
mast, but simply twist them in their shipped position. If you should slightly
shift their relative position along the mast don't despair.. Slight movement
is not critical.
Locate the two short standoffs on the Main Section. Slide the 51 " Top
tuner rod through these standoffs so the screw holes are towards the GAP.
Loosen and adjust the standoffs so the tuner rod is parallel to the mast,
now tighten the clamps.
Locate the drill hole 10" from the end of this tuner rod. Position this
hole between the two standoffs and insert a screw and tighten. This is
a stop screw Q Slide the tuner rod toward the GAP. Locate a black jumper.
Remove the screw holding the lower ' GAP lead, see fig. 3. Place the black
jumper under the screw with the GAP' lead, reinsert and tighten.
Attach the other end of the jumper to the hole at the end of the Top tuner
rod with a screw and tighten.
Locate the four standoffs on the Mid section just below the GAP. Loosen
their clamp. Form these four into a cross, perpendicular and immediately
below the GAP. Tighten the clamp securely.
Locate the four standoff assembly at the top of the Lower Section. Form
these four into a cross perpendicular to the mast. Tighten the clamp lightly.
Now locate the longest standoff on the upper cross assembly. Rotate the
lower cross assembly until it's longest standoff is in line with the one
on the upper unit. Tighten the clamp.
Take the four 102" Mid tuner rods and insert a screw in the hole 10" from
the end of each rod and tighten. This a stop screw.
Slide a 102" rod through each standoff in the top cross, starting with
the end opposite the screw just inserted and then into the bottom standoffs.
Each rod should be parallel to the Main mast. You may have to adjust the
lower cross unit to achieve parallel rods. Each rod should stop at the
There are four yellow transition wires at the GAP, one longer than the
other three. Attach one to each Mid tuner rod with a screw and tighten.
The longest wire attaches to the tuner rod on the longer standoff. All
wires should not be taut. If you find a wire is taut it may be necessary
to rotate the two cross units to relieve any tension on the transition
Locate the 23" extension rod with the attached slotted extender. Locate
the Mid tuner on the longer standoffs. Slide the slotted extender over
the bottom end of this 102" rod until it butts against the 23" extension.
Rotate the extender until the hole in the Mid tuner rod lines up with the
slot in the extender. Insert a screw into this hole and slot and tighten.
See figure 4.
Locate the remaining extender and place it over the Mid tuner rod opposite
the tuner rod just installed. Align the slot in the extender with the hole
on the tuner rod and secure as in J above so it extends 4.5 inches.
Loosen the clamp on the short pair of standoffs on the Lower section. Rotate
this pair until they line up with the Mid tuner rods without the extenders.
Take the last two short standoffs on the Lower section, loosen each clamp
and orient one of these standoffs so it is in line with one from the pair
above it. Orient the other so it is in line with the remaining standoff
of the pair. Tighten the clamps
Slide the shortest Lower tuner rod through the closest spaced standoffs,
with the drill hole closest to the GAP. Locate a black jumper and attach
one end to the top of the short tuner rod with a screw and tighten.
Slide the longer lower tuner rod through the remaining short standoffs,
again, so the screw hole is closest to the GAP. Take the remaining black
jumper and attach it to the top of this rod with a screw and tighten.
Take the other ends of each black jumper and attach it to the Mid Tuner
rod directly above with a screw and tighten. These jumpers should be loose.
If they are taut you can raise or lower the position of the clamp on the
short standoff pair to remove any tension. Proper positioning can be achieved
by making sure the bottom of these two Mid tuner rods are in the same plane
as the tops of your Lower tuner rods.
CHAPTER 5: COUNTERPOISE AND HOOP
The Counterpoise and hoop assembly includes a Counterpoise support
bracket, 4-80" rods, Counterpoise Hoop - a 35' length of copper wire with
a ring terminal, a 4' length of Dacron with a ring terminal, 3 counterpoise
End Caps and a 4' 9" fixed wire extension with 2 ring terminals. The Counterpoise
hoop replaces the conventional radials of a ground mounted vertical.
Counterpoise Bracket Assembly see figure 5.
Locate the Counterpoise bracket. It is partially assembled. Locate the
3/4" x 9" long PVC section with 2 screws attached
Push a 11/4" screw thru one of the vacant holes in the aluminum bracket.
Place one of the drill holes in the PVC tube over this screw.
Push a second screw thru the remaining vacant hole in the aluminum bracket
and then thru the remaining vacant drill hole in the PVC tube.
Attach lock nuts to each screw and tighten both securely
COUNTERPOISE ASSEMBLY see figure 6
Undo the clamp on the assembled Counterpoise bracket. Place the bracket
against the Lower Section in between the two sets of screws at the base.
Reconnect the clamp and tighten securely
It is recommended that the Counterpoise Hoop assembly, be deferred
unt-il the TITAN has been installed in it's final position. RAISING the
antenna with the hoop installed is cumbersome and can damage the antenna.
The following section is easier to complete after the antenna has been
mounted. Check section 6.0 before continuing.
Locate the 80" counterpoise rods. There are drill holes on both ends. Slide
each rod into the Counterpoise bracket see figure 5 & 6. Make sure
the rod with the yellow end cap slides into one side of the aluminum tube,
not the PVC.
Align the hole in the 80" rods with the hole in the counterpoise tubes.
Insert a screw in both holes and tighten.
Locate the 3 Counterpoise End Caps and the 35 foot tinned copper Counterpoise
Hoop with 1 ring terminal. The factory has placed a screw in these End
Each End Cap has a thru drilled hole close to one end. Thread the end of
the copper wire without the ring terminal thru these holes in the End Caps.
Locate the wire extension with the two ring terminals.
Take the ring terminal from the Counterpoise Hoop wire and one terminal
from the wire extension. Place both terminals over the drill hole at the
end of the 80" counterpoise rod that has the yellow end cap and is attached
to the aluminum tube on the Counterpoise bracket. see figure 6. Insert
a screw attaching these terminals to the Counterpoise rod.
Circle the ends of the Counterpoise rods with the Counterpoise Hoop placing
an End Cap on each Counterpoise rod as you circle.
Find the Dacron cord with the ring terminal. Feed the end of the Counterpoise
wire thru the ring terminal on the Dacron cord about 18", fold it
back on itself and secure with the split bolt.
Thread the Dacron cord thru the vacant ring terminal of the wire extension.
Pull the cord until the hoop has no slack in it but, do not over tension
the hoop. Tie a temporary knot in the Dacron cord to the ring terminal
on the wire extension.
IMPORTANT The length of the Counterpoise Hoop controls the center
frequency on 40m. The longer the Counterpoise wire is, the shorter the
Dacron rope is and the lower the resonant frequency will be. Likewise the
shorter the length of the Counterpoise Hoop the higher the resonant frequency
will be and the longer the Dacron rope will be. Adjust the Counterpoise
Hoop so that it ends about 50" from the last End Cap and check the frequency
with your VSWR meter on 40m. Adjust the length to suit your preference
5.4 POLE MOUNT ASSEMBLY-REFER TO FIGURE 7
Locate the 3"xl 2" aluminum plate, the six U-bolts and twelve nuts.
Insert the U-bolts into the plate as shown in figure 7.
Finger tighten the nuts on the ends of all the U-bolts.
Locate the six collar insulators. Place each under a U- bolt.
Using a 7/16" wrench tighten the U-bolts until the collars are just held
Take the assembled unit and slide it over the base of the antenna. They
should slide freely. If not, they are overtightened and the U-bolts should
Continue to slide this unit up the base, until the collar on the first
unit butts, against the lower portion of the antenna. Tighten the nuts
securely on the top unit.
Make sure the nuts that hold the Lower section to the mount plate assembly
Locate your 11 /4" mast. Carefully slide your mast thru the 3 vacant insulating
collars until your mast pipe is flush with the top of the mount plate assembly.
Tighten all U'bolts with a 7/16" wrench
A) Bring the coax tail out through the exit hole in the side of the Lower
Section. Locate the PL259 connector with adapter. Attach the connector
to the coax. See the ARRL Handbook it you are unsure of the procedure.
In your final installation, make sure the connector does not touch your
If properly connected, an ohm meter will read "open" when placed from centerpin
NOTE If your pipe is slightly oversized slit the PVC collars
to allow for expansion. Operating without these insulators can affect performance.
6.0 PRETEST PROCEDURE
It is always best to test the TITAN at ground level before
elevating it. Pretesting is not difficult and may save time and effort
in-the total process. This is particularly true if the antenna is to be
Locate an open space.
Obtain an 11/4" pipe 5' long.
Attach this pipe to the TITAN see section 5.4.
Obtain 3 lengths of rope 25-30' long.
Attach ropes just above the GAP.
Insert a screw driver or small diameter tube in the ground.
With help raise the antenna until it is vertical.
Place your 5* pipe over the screwdriver or tube, this will keep the base
Secure the temporary guy ropes
Complete the hoop assembly see section 5.3. For this test it is not necessary
to put screws into the Counterpoise rods.
A ham band transceiver and SWR meter are required for these tests.
It is recommended that you use the minimum necessary power for the measurement.
If possible, use an SWR bridge separate from that provided in your transceiver.
Using a pencil, record your data in the space provided below.
If the TITAN has been assembled properly it will resonate close to the
selected frequency on 75~80 meters. You should see a useable bandwidth
in excess of 100 KHz under normal operation. Using minimal power, 10 watts
Record the minimum VSWR on 75/80. _______________________
2:1 VSWR Hi frequency ________________________
2:1 VSWR Low frequency ________________________
Using minimal power, determine the resonate frequency on 40 meters.
Minimum VSWR _________________________
2:1 Hi frequency _________________________
2:1 Low frequency _________________________
30 meters is next. Frequency: 10.100
20 meters 14.00 ________________________
17 meters 18.068 ________________________
15 meters 21.00 _________________________
12 meters 24.890 _________________________
10 meters 28.00 _________________________
CHAPTER 7 TIPS AND TROUBLE SHOOTING
The TITAN DX-VIII has been designed to operate on the 8 bands specified.
Operation outside the -- specified bands may damage the antenna. Use of
an antenna tuner is not required nor recommended. Tuners will not improve
the performance of the antenna, although they may permit a solid state
transmitter to put out more power. Operation of the antenna using a tuner
on any frequency where the VSWR exceeds 2:1 may damage the antenna. Use
when VSWR is less than 2:1 is acceptable.
If you are unable to solve the problem,
contact the factory for assistance. Please have section 6.2 filled in and
handy when you call. We do not charge for assistance and our phone number
is (561) 571-9922.
If the antenna fails to resonate on the 75/80 meter band the CAP unit plugged
on at the top of the antenna may not be making proper contact or was inadvertently
shorted when the screw was inserted.
If all your standing waves are high, double check the PL259 connector at
the base of the antenna and make sure it is open from center pin to shield.
If only a couple of bands are high eliminate the following possibilities;
Bad coaxial feedline. If the coax has been in use for some time,
it may be contaminated. Place a 50 ohm dummy load at the far end of your
feedline, in place of the antenna. Any indication of varying VSWR or a
standing wave greater than 1 :1 suggest defective coax.
Mutual coupling with nearby vertical metal objects may detune the TITAN.
Check to see if any of the items suggested in section 1.2 & 1.3 apply.
Transceivers with built in SWR bridges may not correctly indicate when
their power reduction circuits take over. Retest with a separate VSWR meter.
The transceiver or transmitter may be emitting a spurious signal in addition
to the desired signal. Retest using the lowest possible power level. If
possible try another rig.
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May 28, 20001