SGC STEALTH Kit Quick Start Guide

The STEALTH Kit

Thank you for choosing the American made, SGC STEALTH
Kit. We are confident that you will be happy with your purchase and
assure you of our full commitment to customer service. Since 1971,
SGC has been designing and manufacturing a wide range of HF SSB
communications products. Our goal is to provide reliable equipment,
which is competitively priced and which fits the need of the radio user.
With the STEALTH Kit, SGC has provided an all-in-one,
convenient antenna solution. The STEALTH Kit is perfect for emer­gency use, when an urgent communications command center must be
setup in minutes. The STEALTH Kit contains everything a novice or
professional needs to erect an antenna in any location—and provides
performance equivalent to most dipole antennas!
And, in keeping with its’ name, the STEALTH Kit is an ideal
antenna solution for restricted areas, such as condominiums and gated
communities where dipoles and towers are forbidden. Or, use the
STEALTH in city apartments where access to roofs or large open areas
is restricted. The STEALTH Kit is also a great antenna solution when
you are on vacation. Whether in an RV or a hotel room, the STEALTH
Kit is a “Grab and Go” box - filled with everything you need to com­plete your communications center.
We are proud of the STEALTH Kit as it provides an antenna
system that is automatic, easy to install and easy to use. Any location,
any radio and any situation - the STEALTH Kit is the perfect choice
for a quick and convenient antenna solution.

Pierre Goral
President
KI7UA

Table of Contents

Quick Start.............................................................4

1.0 Introductio n.......................................................5

2.0 Specifications....................................................6

3.0 Supplied Items..................................................7

4.0 Installatio n.........................................................7

4.1 Advance preparation for emergency use...........7

4.1 Antenna Installation ..........................................8

4.1.1 Antenna Orientation.......................................8

4.1.1.1 Horizontal - for less than 500 miles.............9

4.1.1.2 Vertical - for more than 500 miles..............10

4.1.2 Shape of the antenna loop...........................10

4.1.3 Antenna Directivity.......................................10

4.1.4 Height of antenna.........................................11

4.1.5 Inside or outside...........................................11

4.1.6 Environment.................................................11

4.2 So what should I do?.......................................11

4.2.1 One Loop Configurations .............................12

4.2.2 Two Loop Configurations .............................13

4.2.3 Three Loop Configurations ...........................14

4.2.4 Four Loop Configurations.............................14

4.2.5 Coupler Connection Point ............................14

4.3 Sample Installation..........................................15

4.4 SG-237 Smartuner Coupler Installation...........19

4.5 Tips: Do’s & Don’ts .........................................19

5.0 Adjustable Directive Loop Antenna .................21

5.1 Antenna Setup with Four Brooms....................25

5.2 General Appl ications.......................................27

6.0 SGC Limited Product Warranty.......................29

7.0 Appendix.........................................................30

8.0 Global Reference Database............................38

9.0 Conclusion......................................................38

10.0 Further Reading............................................39

11.0 Special Thanks .............................................39

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Quick Start

1. Locate a proper area where you would like to erect your loop
antenna. Initially the system could b e o perated with the antenna
lying on the floor.

2. Connect your coupler to the transceiver and a suitable 12VDC
power supply. This can be the same source as the power supply to
the radio if it is a 12VDC unit. Avoid regulated linear or switch­ing power supplies as they may be susceptible to RF radi ation
and may lose regulation and apply higher voltage than permissi­ble. Power supplies may also lose regulation at peak modulation
and cause intermittent operation.

3. Connect your loop antenna to the two terminals of the coupler;
one hot side, one ground side. Both have a wing nut terminal to
allow easy attachment.

4. If urgent operation is required, transmit on an emergency fre­quency with the antenna on the ground. Although this setup is not
efficient, it will allow you to easily establish a communication
link in an emergency.

5. Configure your antenna in single or multiple loops (not to exceed
four loops).

6. Elevate your system to any surrounding high points such as a
tree, roof, top of car, ceiling, mast, etc. Attach with 4 ropes and
clips provided. The coupler can also be elevated using the fifth
piece of rope.

7. After your initial contact, you may improve your antenna ins talla­tion following the guidelines in this manual.

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Toll-Free: 800-259-7331 • Phone [phone] • Fax: [phone]

www.sgcworld.com • Email: [e-mail]

© March 2002 - SGC, Inc.

1.0 Introduction

The Smart Tuning, Emergency Antenna Loop, Tactical HF Kit ­STEALTH - antenna kit is a high-freque ncy antenna for situations
where a full size antenna is not possible. Its main features are:

•

Easily configured to the space available

•

Groundless - no RF ground re quired

•

Easy to install - kit contains all necessary items

•

Automatic operation

•

Easy to use - no meters or lights to watch, no buttons to
push

•

Wide bandwidth - 2.5 (and lower for non-amateur radio
usage) to 30 MHz

•

High performance - can match the performance of a full
size dipole

STEALTH is a loop antenna chosen for its radiation efficiency and
because it does not require an electrical ground. It can be horizontal or
vertical mounted for short and long range communications needs.

An important use of STEALTH is as an emergency antenna.
STEALTH is easy to install and easy to operate. Its small size makes
it easy to transport and quick to install.

But STEALTH was also designed for...
The amateur radio user who is struggling with Homeowners’

“Covenants, Conditions & Restrictions”. A stealth antenna can be
installed with no visible signs of its presence, in developments where
erected antennas are forbidden.

Those living in an apartment or similar limited environment.
STEALTH provides an effective antenna in small spaces. It can be
installed in an area as small as 5 feet by 5 feet.

Use as an effective, ready to go, compact vacation antenna.

Offices, farms, etc. It can be used where other antennas are not practi­cal.

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Shipping: 13737 SE 26th St., Bellevue, WA 98005

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1.1 Disclaimers

RF Burns can occur if the output terminals or antenna wire of the SG­237 are touched while transmitting. Use caution to avoid injury and
burns.

Prolonged exposure to RF should be avoided. Those persons using
heart pacemaker devices should avoid RF exposure.

To avoid injury and damage to equipment: Whenever possible, we
strongly recommend reducing transmit power. Preferably, 10 to 25
watts should be used and will generally provide good communica­tions. If using an outside antenna, 100 watts can be used without any
harmful consequences.

If for any reason a particular setup or frequency does not provide the
expected results, minor changes can significantly improve perform­ance. For example: move the radio as far away as possible from the
coupler or antenna; avoid coiled power or coaxial feed cables; recon­figure setup, etc.

SGC accepts no responsibility for performance or results from the
STEALTH Kit. SGC accepts no responsibility for any unlikely dam­age or injury resulting from the use of the STEALTH Kit.

2.0 Specifications

• Antenna loop perimeter: 80’ (24m)

• Maximum square configuration - 20’ (6.1m)

• Minimum squa re configuration - 5’ (1.5m)

• Number of turns - 1 to 4

• HF frequency range - 2.5 to 60 MHz.

• Maximum power - 100 watts

• Package size 3.5” x 10” x 15” (8.9cm x 25.4cm x 38.1cm)

• Package Weight 5lbs. (2.3kg)

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Toll-Free: 800-259-7331 • Phone [phone] • Fax: [phone]

www.sgcworld.com • Email: [e-mail]

© March 2002 - SGC, Inc.

Performance and results may vary and SGC does not warrant any in­stallation or any result. SGC reserves the rig ht to change the specifica­tions without notice.

3.0 Supplied Items

•

SG-237 Smartuner HF Antenna coupler and manual.

•

80’ (25m) of loop antenna wire.

•

4 - antenna mounting clips and 20’ (6m) ropes attached

•

30’ (9.14m) of nylon support rope with clip

•

12 - Releasable cable ties

•

2 - spare antenna mounting clips

4.0 Installation

4.1 Advance Preparation for emergency use

Plan your emergency station before you need it! You should consider
things like:

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• Equipment - Have you selected the equipment to be used
in an emergency situation? Is that equipment able to
withstand possible abuse? Do you have all power
sources immediately available and, in the case of batter­ies, are they fully charged?

• Cable extensions - Do you have AC cords long enough
for typical situations? Is your coax long enough or
should you have some exten si ons? If your installation
will be battery powered, do you have cables to reach
them and also the cables needed to maintain the charge
on them?

• Connector installation(s) - Have you installed all con­nectors on all the cables which might be needed?

• Where are your emergency supplies - Are they in one,
quickly retrievable location? Or do you have them scat­tered around?

Do not wait for an emergency to happen - be ready. Test
everything including STEALTH. Be fully prepared to react
in the event of an emergency.

4.1 Antenna Installation

There are several factors which need to be considered before install­ing the antenna and some can affect others.

WARNING!

Never mount any antenna near power lines or utility wires. Any

materials, ladders, ropes, feedlines, etc., which come in contact

with power lines can conduct voltages that can be fatal.

Stay away from all power lines.

4.1.1 Antenna Orientation

Because the signal radiation of a loop antenna is perpendicular to the
plane of the loop, how you orient the antenna should be determined
by your communica tio n need s .

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© March 2002 - SGC, Inc.

This is called polarization. A loop mounted horizontally is considered
to be vertically polarized as the signal is primarily radiated vertically
and will provide more effective short distance communications. Like­wise, a loop mounted vertically is horizontally polarized as its signal
is primarily radiated horizontally and is better for long range commu­nications.

4.1.1.1 Horizontal - for less than 500 miles
(830km)

If your needs are expected to be less than 500 miles (830km), the best
results can be obtained by orienting the antenna so the plane of the
loop is horizontal.

Horizontal triangular plane - f or vertical radiation, the coupler is
supported by rope, approx. 25 ft. in the center of the back segment.

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4.1.1.2 Vertical - more than 500 miles
(830km)

Use this type of antenna when you need to maintain long range com­munications of 500 to 5000 miles (830km to 8300km).

Vertically mounted two-turn
loop. The coupler is installed in
center of lower section antenna.

4.1.2 Shape of the an­tenna loop

The ideal shape of the antenna for
this situation would b e a single turn
circle. However, this would require
complicated mounting.

Most needs can be fulfilled with a

one-turn square, rectangle or trian­gle shape. When there are limitations on what the size and shape of
the loop can be, it might be necessary to reduce the size by making
the loop two, three or four turns.

4.1.3 Antenna directivity

Like any antenna, a loop antenna is directional. As the size of the loop
is reduced, by configuring it as two, three o r four turns, the directivity
becomes more significant.

10

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© March 2002 - SGC, Inc.

4.1.4 Height of antenna

As is the case with all antennas, the rule of thumb is “the higher the
better”. You should attempt to make the lowest point of the loop at
least 10 feet (3mtr) above ground.

4.1.5 Inside or outside

If possible, the antenna should be located outside and clear of any
structures for maximum effectiveness. If you find this impossible, and
you must locate the antenna inside, consider the following:

•

Ensure that the antenna will be at least 4 inches (10cm.)
away from any larger metal objects such as a corner
column or window support.

•

Does the ceiling or roof of the room contain metal mate­rial? This can have a negative effect on the performance
of the antenna.

•

Is there any metal within the outside wall s o f the build­ing? This can also have a negative effect.

4.1.6 Environment

Your physical environment can influence how you mount STEALTH.
For example, in a rainy area, an outside mounted antenna would need
to be mounted as high as possible to avoid interaction with the wet
ground. In a desert, where it is dry, this would be less of a considera­tion.

4.2 So what should I do?

The above descriptions are the ideal situations and may not always be
obtainable. You should make every effort to install the antenna in an
optimum way.

Although a square or rectangular antenna loop is generally more ef­fective, a triangular loop can also be used. If necessary, shape the an­tenna as two-turn or three-turn loop and lay it on an inside floor. It
will not be as efficient as possible but you should be able to conduct
effective communications.

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The sketches below show possible shapes.

One Loop Configurations

Configuration 101

Configuration 102

These configurations are the most common and
are used for installations outsid e and away from buildings.

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Configuration 103

© March 2002 - SGC, Inc.

Two Loop Configurations

Configuration 201

Configuration 202

Configuration 203

The two turn loop is primarily used for inside situations. It is also a
very convenient installation for vacationing, a small patio, or even a
greenhouse.

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Three Loop Configurations

Configuration 301

Four Loop Configurations

Configuration 302

Configuration 401

Configuration 402

The three and four turn loops are almost always indoor antennas and
are very convenient for situations where there is a limited amount of
space available. This will be of significant importance for the office or
apartment user where they can be mounted near a window or door.

Coupler Connection Point

In the case of the triangular configurations above, the coupler is
shown connected at a mid point of one of the legs which is the sug­gested point. If necessary, it can also be connected at a corner of the
triangle. Testing has sho wn that the corner connection performs better
when the coupler is connected at a midpoint of one of the legs or seg­ments. (Configurations 501, 502 & 503 will perform better than 302
& 402.)

14

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© March 2002 - SGC, Inc.

Configuration 502

Configuration 501

Configuration 503

Tip: one drawback when connecting the coupler at a corner of a tri­angular configuration is that the support ropes for the coupler can
become long and difficult to install p ro perly.

If you have obtained the STEALTH for emergency use, practice
installing the antenna. This will benef it yo u when it comes to an
actual emergency situation.

4.3 Sample installation

WARNING!

Never mount any antenna near power lines or utility wires. Any

materials, ladders, ropes, feedlines, etc., which come in contact

with power lines can conduct voltages that can be fatal.

Stay away from all power lines.

For the limited space available, a three-turn square loop antenna,
mounted vertically, for long range communication needs, is to be as­sembled with the coupler resting on the floor.

This will show how to construct the antenna so that emergency opera­tions can begin as quic kly as possible. You will then be shown how to
finish the installation for better performance.

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• Form the antenna wire into the approximate desired shape and

size and slightly knot the ends of the wire together for later at­taching to the coupler.

•

Attach four support ropes at corners of antenna using the supplied
antenna clips. The wires will easily snap into the clips.

The two loops of
the antenna
wire have been
strapped into a
support clip.

• Raise the antenna as much as possible and secure the ropes.

The antenna,
which was
formed on the
floor, is being
raised to its
final position.

• Secure the lower corners of the antenna.

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© March 2002 - SGC, Inc.

In this sample installation, the
support ropes were attached to
2 chairs.

• Attach the coupler to ends of antenna wire and lay it on the floo r .

The antenna has been
raised to its final posi­tion and ends have
been connected to the
coupler which is lying
on the floor.

• Attach the cable from the coupler to the radio and connect the
coupler power leads - see section 4.4.

Do not coil any cables! Doing so can make them susceptible to the

radiated signal from the antenna and they can have a negative
effect on the performance of the antenna and radio system.

At this point in the constructio n o f the antenna, which required 15

minutes to accomplish, emergency operation is possible.

When time permits, the installation should be completed to improve

the performance of the antenna by...

• Only in an emergency should coupler be hung by antenna wir e. A
30 foot rope has been provided to support the coupler mechani­cally and provide relief to the antenna wire. Attach a section of
rope through mou nting holes on each side of the coup ler.

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A support rope
has been passed
through the
mounting holes
of the coupler.

And secure the ropes so the coupler is supported.

• The corners of the antenna loop located near the floor can be

raised.

The lower cor­ners of the an­tenna have been
attached to two
chairs which are
then moved to
form the an­tenna into its
final shape.

The test results of this three-turn vertically mounted antenna can be
found in Appendix A

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www.sgcworld.com • Email: [e-mail]

© March 2002 - SGC, Inc.

4.4 SG-237 Smartuner HF Antenna Coupler In-

stallation

Read the SG-237 manual, which is included, as it provides detailed
information which can be helpful to your installation.

The coaxial connector at the end of the coupler cable can then be se­curely attached to the radio equipment.

The red wire should be attached to a +12 volt power source and the
black wire to ground.

4.5 Tips, Do’s and Don’ts

• Do not coil any cables, even those which are not part of the an-
tenna. Doing so can make them susceptible to the signal radiated
by the antenna and could impact the performance of the antenna
and the radio system.

• If an “RF Burn” - it feels like a sting - is experienced by touching
the radio while transmitting, eliminate potential RF by grounding
the radio by attaching one or more 15 to 40 foot wires (not sup­plied) to the ground terminal of the radio.

• When shaping the wire for a multi -turn antenna, it will be much
easier to accomplish if you can get another person to help. Form
the loops, them alternate shaking and gently pulling the wire until
all of the loops are the same length.

• To verify that the antenna is radiating a signal, any 5 to 100 Watt
fluorescent light tube can be used. By moving the bulb around the
perimeter of the antenna you will find spots where the bulb lights
up indicating the presence of radiated RF power. Intensity of light
increases with power in the antenna and on lower frequencies.

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For RF radiation
detection, the fluo­rescent tube has
been moved
around the loop
until a position was
found where the
bulb glowed.

• Knot the ends of the supplied antenna wire together before at-

tempting to shape or install the antenna. Once the antenna has
been raised into position, the knot can be r emoved and the cou­pler attached to the ends of the wire.

• Whenever nylon rope is cut, the ends will quickly become unrav-

eled. This can be eliminated by slowly warming the ends with a
small flame until the rope is melted slightly. You may use a
match or a lighter for this p ur pose.

• The coupler should be supported by a section of rope passed

through its mounting holes. Do not

allow it to hang unsupported

from the antenna wire.

• When the installation of STEALTH will be a two-turn or three-

turn configuration, forming the loops first will make the installa­tion much easier to accomplish.

Appendix A (pg. 31) contains photographs of sample configurations
and performance test results.

20

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© March 2002 - SGC, Inc.

5.0 Adjustable Directive Loop Antenna

A small, highly directive, four-turn loop antenna can be constructed
for indoor or outdoor use. The Adjustable Directive Loop Antenna
can be used in a room as small as 10 by 10 feet. It can be hung from
the ceiling with the supplied rope for orientation of the antenna for
the best receiving or transmitting signal. By listening to a station, the
operator can simply rotate the antenna for b e st signal strength or intel­ligibility.

When used indoors, appliances may cause local interferences or radio
frequency pollution which could substantially impair the incoming
signal. In this situation, the antenna can be oriented to minimize the
interference and enhance the incoming signal. Also, when reaching
the contact station, a test can be performed by asking the contact sta­tion for a signal report. Rotating the antenna in 45 degree incre ments
is the best way to determine the be st r a diation direction.

Direction of the angle is perpendicular to the plane of the antenna
with directivity gain varying from 6 to 12db for a 4-turn loop antenna.
This depend s on the operating frequency - the lower the frequency the
higher the directivity.

For this construction, two wooden flagpoles, sticks or plastic plumb­ing tubes of 6 feet long would be required and a hookup point on the
ceiling, 7 feet or more above the ground.

The following pages describ e this type of installation.

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First construct the cross sectio n of the two sticks by using the sup­plied rope - on the vertical stick by approximately 2 to 3 inches
above the center.

Next, use two of the supplied cable ties at the end of each pole; one
to go around the pole and to hold the other in place. Four sets of two
will be required, one set for each of the four ends of the poles.

22

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© March 2002 - SGC, Inc.

Attach the cable ties 2 inches from three ends of the pole. For the
fourth side (the bottom), place the cable ties 14 to 15 inches from the
end of the pole. This will create a 4 by 4 foot loop approximately.

Next, on the bottom below the cable ties, attach the coupler vertically
with rope or more cable ties.

Now, attach the antenna wire to the coupler output and loop the an­tenna five times through t he loops previously made. When completed,
attach the end of the loop antenna to the couplers ground terminal. If
any wire is left, pass it through an additional cab le tie or just let it
hang from the lowest part of the loop. If the antenna ends up too short
to get to the ground terminal, re move it from the last cable tie and go
directly to the ground terminal.

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This setup is an effective way to improve the connections.

Configuration 601

Note: Drawing shows construc­tion details and is not to scale.

Rotate the antenna until the best direction is achieved. Then, secur e it
with an additional rope attached to a nearby object such as a window
or door.

Note: Any materials can be used for this set up with the exception of
metal. Test performances expected are similar to the four loop an­tenna described on page 35.

24

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© March 2002 - SGC, Inc.

5.1 Directive Loop Antenna Improvised

with Four Brooms

This is an example of a 15 minute improvisational setup using
wooden brooms in a very small area.

These are the steps used to install our
sample setup.

1. Tie four brooms together in a criss­cross fashion using the ropes pro­vided.

2. Loop the antenna wire around the
brooms four times. Use the bristles
to keep each loop of the wire apart.

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25

3. Hang system from ceiling
using cable ties provided.

4. Attach tuner to antenna
wires.

5. Attach the coupler to the
lower broom.

6. Attach coupler to radio.

7. Rotate system horizontally
until the best connectio n is r e­ceived.

26

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© March 2002 - SGC, Inc.

5.2 General Applications

Most of the loop antennas described can be used anywhere, on board
boats, aircraft and cars.

For example,
the loop an­tenna can be
configure d on
a sail boat
from the top

Radiation

of the mast to
the front or
back of the
vessel, with

Vessel
Groundless
Loop

Coupler

the coupler
located on the
deck avoiding
installation of
expensive
backstay iso­lators.

Lower mast connection

to coupler RF ground

On an airplane the
antenna could be
configured using a

Ground

Fixed Wing Aircraft

Wire goes to
the coupler

Wire antenna

Coupler

Isolator

single or multi-loop
triangular configu­ration from the
cockpit to the top
of the tail. Antenna

Aviation
control
head

Radio

Wire antenna

Isolator

wire supplied could
be replaced by
stronger bronze phosphorus cables (for airplanes faster than 80 miles
per hour).

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27

The antenna could be mounted on the top of a car or camper using
short plastic mountings of 4” to 8” in length and elevating it from the
roof of the vehicle.

18" PVC
pipe
standoffs

Recreational Vehicle
Antenna Installation

Antenna wire

Coupler

inside coach

mounted

Use a separate ground strap or wire for the body
and the chassis to the ground of the coupler.

Helicopters can also be fitted with a triang ular configuration from the
front to the back of the underside of the aircraft body.

Rotary Aircraft

Isolator

Wire antenna

Strut to space out
antenna with plastic
tubing or fiberglass
rod

Mailing: PO Box 3526, Bellevue, WA 98009

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28

Toll-Free: 800-259-7331 • Phone [phone] • Fax: [phone]

www.sgcworld.com • Email: [e-mail]

Coupler

© March 2002 - SGC, Inc.

6.0 SGC Limited Product Warranty

and Software License - 1Year Parts & Labor

This manual is p r oduced a s a gui de li ne f or t he S mart Tuni ng, E mer genc y Ant en na
Loop, Tactical HF Kit - STEALTH Kit. Performance and results may vary and
SGC does not warrant any installation or any result. This manual is subject to
change without notic e. You have purchased an SGC product together wi th a li­cense to use the software installed in that product. Please return the warra nty regis­tration card tha t accompanies this produc t so that we can ensure tha t you receive
proper warranty ser vice and important notices that may af fect the product. This
SGC product is war rant ed to be f r ee from defec t s i n work mans hip and mat eri a l for
a period of days f rom the origina l buyer’s da te of purcha se. In the event of a de­fect, malfunc tion or fa ilure of which SGC recei ves noti ce during t hat ti me period,
SGC, at its option, will repair or replace the product fr ee of charge to the bu yer.
The buyer must contact SGC for a Return Material Authorization (RMA) and
deliver the product back to SGC with this RMA nu mber and written proof as to
the date of purchase. SGC will ship a new or repaired product to the buyer, reserv­ing the discretionary right to return a newer model that offers at least equal per­formance. The foregoing warranty extends to the original buyer and does not in­clude (a) buyer’s c ost to return the pr oduct to SGC, (b) b uyer’s cost to remo ve or
reinstall the product for warranty work, or (c) added costs of special expedit ed
shipment that may be requested by the buyer. Except for the limited warranty
stated above, and to the full extent permitted by the law, SGC disclaims any other
express or implied warranties and liability for any incident, consequential, special
or exemplary damages i n connection with its produc t, even if SGC or its agents
are advised that such damages are foreseeable. (Note: some states do not allow
exclusion or li mitation of incidental or consequent ial damages, so t he above exclu­sion may not appl y to you.) Ther e is no war ranty with res pect t o (a) the product ’s
transmission r ange or ge ographi cal covera ge which c an var y by locati on, (b) non­performance caused by using an inadequate or improper antenna or grounding
system, or (c) r outine maintenanc e, periodic adjustments and p erformance test ing
of the product or s ystem. S GC c us to mar il y cha rges a flat f ee for r epairs p erf or med
outside of the war ranty coverage. To inquire ab out such charges, please cont act
SGC. SGC warrants tha t t he SOFT WARE i ncl ude d in t his pr oduc t will perform in
substantial accordance with the documentation. SGC grants to the original end
user of its product a non-exc lusive worldwide licens e to operate the software in­stalled therein. This license shall be transferred to any person or entity that subse­quently acquir es lawful ownershi p of the product. This lic ense shall be limited t o
the using of the soft ware for contemplated oper ation of SGC’s product. This li ­cense does not permit any end user to (a) modify or ada pt SGC’s software or

merge it into another program, (b) reverse engineer, disassemble, or otherwise
attempt to discover SGC’s software source code, or (c) sub license or other­wise transfer SGC’s software for any use other than operating the product
originally purchased from SGC.

to

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29

7.0 Appendix

The appendix contains seven sample configurations and the
results of the testi ng.

• One-turn loop antenna mounted horizontally outside, 12
feet above the ground. Tested at 20 watts. (page 31)

• Three-turn loop antenna mounted vertically inside a build­ing. Tested at 20 watts. (page 32)

• One-turn loop antenna mounted horizontally outside, 12
feet above ground. Tested at 100 watts. (page 33)

• Three-turn loop antenna mounted vertically inside a build­ing. Tested at 100 watts. (page 34)

• Four-turn loop antenna mounted vertically inside a build­ing. Tested at 100 watts. (page 35)

• Four-turn loop antenna mounted vertically inside building,
operating from 50 to 54 MHz. Tested at 20 watts & 100
watts (page 36)

• Adjustable Directive Loop Antenna, mounted inside. (page

37)

30

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www.sgcworld.com • Email: [e-mail]

© March 2002 - SGC, Inc.

Appendix A

Antenna Installation: One-turn triangular loop mounted 12 feet horizon­tally above ground. Used SG-2020 transceiver.

Bottom of band

f (MHz)

80 3.510 MHz

VSWR 1.1:1 1.1:1 1:1

40 7.010 MHz

VSWR 1:1 1:1 1.1:1

30 10.110 MHz

VSWR 1:1 1:1 1:1

20 14.010 MHz

VSWR 1:1 1:1 1.2:1

17 18.078 MHz

VSWR 1:1 1:1 1:1

15 21.010 MHz

VSWR 1:1 1:1 1.1:1

12 24.900 MHz

VSWR 1:1 1:1 1:1

10 28.010 MHz

VSWR 1.1:1 1.1:1 1:1

Fwd Ref Fwd Ref Fwd Ref

20w .7w

21w .2w

21w

23w

21w

21w

20w .1w

19w

Middle of band

f (MHz)

3.750 MHz
20w .7w

7.150 MHz
21w .1w

0 10.125 MHz

21w

0 14.175 MHz

22w .2w

0 18.118 MHz

21w

0 21.225 MHz

20w

24.940 MHz
20w

28.850 MHz

.6

19w 1.2

Top of band

f (MHz)

3.990 MHz
20w

7.290 MHz
21w 1.3w

0 10.140 MHz

21w

14.340 MHz
20w 2.1w

0 18.158 MHz

21w

0 21.440 MHz

20w 1w

24.980 MHz

.1

20w

29.690 MHz
21w

Notes:

Lowest Usable

0

Frequency =

2.6 MHz

Fwd = 20.2w

0

Ref = .2w

SWR = 1.02:1

0

.1

0

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31

Antenna Installation: Inside three-turn square loop mounted verti­cally. Used SG-2020 transceiver.

Bottom of band

f (MHz)

Fwd Ref Fwd Ref Fwd Ref

80 3.510 MHz

18w

VSWR 1:1 1.9:1 1.1:1

40 7.010 MHz

18w

VSWR 1.1:1 1.3:1 1.1:1

30 10.110 MHz

18w

VSWR 1:1 1:1 1:1

20 14.010 MHz

18w

VSWR 1:1 1:1 1.:1

17 18.078 MHz

18w

VSWR 1:1 1:1 1:1

15 21.010 MHz

17w

VSWR 1.3:1 1.1:1 1.1:1

12 24.900 MHz

16w

VSWR 1:1 1:1 1:1

10 28.010 MHz

14w

VSWR 2.1:1 1.2:1 1:1

Middle of band

f (MHz)

.2 3.750 MHz

17w

.9 7.150 MHz

19w

.2 10.125 MHz

18w

0 14.175 MHz

18w

0 18.118 MHz

18w

1.9 21.225 MHz
17w

0 24.940 MHz

16w

5 28.850 MHz

18w

Top of band

f (MHz)

5.1 3.990 MHz
17w

2.2 7.290 MHz
19w

.1 10. 140 MHz

18w

0 14.340 MHz

18w

0 18.158 MHz

18w

1 21.440 MHz

17w

.1 24. 980 MHz

16w

1.7 29.690 MHz
17w

1

Notes:

Lowest Usable

.5

Frequency =

2.4 MHz

0

Fwd = 18w

.2

Ref = 3w

.2

SWR = 1.4:1

1

0

0

32

Mailing: PO Box 3526, Bellevue, WA 98009

Shipping: 13737 SE 26th St., Bellevue, WA 98005

Toll-Free: 800-259-7331 • Phone [phone] • Fax: [phone]

www.sgcworld.com • Email: [e-mail]

© March 2002 - SGC, Inc.

Antenna Configuration: One-turn triangular loop mounted 12 feet
horizontally above ground. Used IC-736 Transceiver.

Middle of band

Bottom of band

f (MHz)

Fwd Ref Fwd Ref Fwd Ref

80m 3.510 MHz

110w 0

VSWR 1:1 1:1 1.2:1

40m 7.010 MHz

110w 0

VSWR 1:1 1:1 1:1

30m 10.110 MHz

45w

VSWR 1:1 1:1 1:1

20m 14.010 MHz

120w 0

VSWR 1:1 1.2:1 1.6:1

17m 18.078 MHz

120w 0

VSWR 1:1 1:1 1.1:1

15m 21.010 MHz

110w 3w

VSWR 1.1:1 1.1:1 1:1

12m 24.900 MHz

120w 1w

VSWR 1.1:1 1:1 1:1

10m 28.010 MHz

110w 5w

VSWR 1.1:1 1.1:1 1.1:1

f (MHz)

3.750 MHz
110w 0

7.150 MHz

110

0 10.125 MHz

44w

14.175 MHz
115w 8w

18.118 MHz
120w 0

21.225 MHz
107w 4w

24.940 MHz
122w 1w

28.850MHz
110w 3w

Top of band

f (MHz)

3.990 MHz
110w 8

0 7.290 MHz

115

0 10.140 MHz

42w

14.340 MHz
75w 18w

18.158 MHz

123w 4w

21.440 MHz

120w 0

24.980 MHz

124w 1w

29.690 MHz

110w 4w

Notes:

Lowest usable

0

frequency =

2.6 MHz

0

Fwd = 110w

Ref = 3w

SWR = 1.06:1

Mailing: PO Box 3526, Bellevue, WA 98009

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33

Antenna Installation: Inside three-turn square loop mounted vertically.
Used IC-736 Transceiver.

Fwd Ref Fwd Ref Fwd Ref

80 3.510

VSWR 1:1 1:1 1:1

40 7.010

VSWR 1:1 1:1 1:1

30 10.110

VSWR 1:1 1.1:1 1.1:1

20 14.010

VSWR 1:1 1:1 1.1:1

17 18.078

VSWR 1:1 1:1 1:1

15 21.010

VSWR 1:1 1:1 1.1:1

12 24.900

VSWR 1.1:1 1.1:1 1.1:1

10 28.010

VSWR 1.1:1 1.2:1 1:1

Bottom of band

f (MHz)

120w

123w

110w

120w

120w

120w

116w

112w

1w

1w

2w

0

0

0

4w

5w

Middle of band

f (MHz)

3.750
120w

7.150
125w

10.125
115w

14.175
113w

18.118
122w

21.225
116w

24.940
116w

28.850

90w

Top of band

f (MHz)

0 3.990

121w 0

7.290

2w

116w 0

10.140

6w

113w 7w

0 14.340

111w 3w

0 18.158

125w 1w

0 21.440

119w 2w

24.980

5w

116w 5w

29.690

9w

115w 0

34

Notes: There was a mild RF burn on the
10 MHz frequencies; it was eliminated
by laying 3 wires on the floor as a
ground which was connected to the
ground terminal on the transceiver.

Lowest usable frequency = 2.5 MHz
Fwd = 113w
Ref = 9w
SWR = 1.17:1

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www.sgcworld.com • Email: [e-mail]

© March 2002 - SGC, Inc.

Antenna Installation: Four-turn vertically mounted antenna,

mounted inside, using IC-736.

Bottom of band

Fwd Ref Fwd Ref Fwd Ref

80 3.510 MHz

VSWR 1:1 1:1 1.1:1

40 7.010 MHz

VSWR 1.1:1 1.1:1 1:1

30 10.110 MHz

VSWR 1.4:1 1.4:1 1.5:1

20 14.010 MHz

VSWR 1:1 1.1:1 1:1

17 18.078 MHz

VSWR 1:1 1:1 1:1

15 21.010 MHz

VSWR 1.1:1 1.1:1 1:1

12 24.900 MHz

VSWR 1.1:1 1.1:1 1.1:1

10 28.010 MHz

VSWR 1.2:1 1.1:1 1.1:1

f (MHz)

104w 2w

100w 3w

80w 14w

107w 1w

104w 1w

105w 7w

110w 4w

95w 8w

Middle of band

f (MHz)

3.750 MHz
104w

7.150 MHz
100w

10.125 MHz
80w

14.175 MHz

108w

18.118 MHz

104w

21.225 MHz

107w

24.940 MHz

110w

28.850 MHz

100w

2w

6w

14w

4w

0w

3w

4w

6w

Top of band

f (MHz)

3.990 MHz
100w 5w

7.290 MHz
105w 2w

10.140 MHz
75w 14w

14.340 MHz

104w 0w

18.158 MHz

105w 1w

21.440 MHz

107w 2w

24.980 MHz

105w 7w

29.690 MHz

105w 4w

Lowest usable fr eq uency =

2.5 MHz

Fwd = 102w

Ref = 5w

SWR = 1.1:1

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35

High End Frequency Test (6 meter)

Antenna: Three turn vertically mounted inside. Tested using
Alinco DR-M06

50.01 MHz Fwd = 19w Ref = 1w SWR = 1.1:1

51.00 MHz Fwd = 16.7w Ref = 1.5w SWR = 1.2:1

52.00 MHz Fwd = 19.8w Ref = 1.6w SWR = 1.2:1

53.00 MHz Fwd = 15w Ref = 3.7w SWR = 1.7:1

53.99 MHz Fwd = 19w Ref = 1.9w SWR = 1.2:1
Antenna: Four turn vertically mounted inside. Tested using

Alinco DR-M06

50.01 MHz Fwd = 19w Ref = .4w SWR = 1:1

51.00 MHz Fwd = 20w Ref = 2.5w SWR = 1.3:1

52.00 MHz Fwd = 17.5w Ref = 3.5w SWR = 1.5:1

53.00 MHz Fwd = 18.5w Ref = 3.7w SWR = 1.5:1

53.99 MHz Fwd = 18.5w Ref = .5w SWR = 1.1:1

36

Mailing: PO Box 3526, Bellevue, WA 98009

Shipping: 13737 SE 26th St., Bellevue, WA 98005

Toll-Free: 800-259-7331 • Phone [phone] • Fax: [phone]

www.sgcworld.com • Email: [e-mail]

© March 2002 - SGC, Inc.

Antenna Installation: Adjustable Directive Loop Antenna,
mounted inside.

Bottom of band

Fwd Ref Fwd Ref Fwd Ref

80 3.510 MHz

VSWR 1.1:1 1.1:1 1.1:1

40 7.010 MHz

VSWR 1.1:1 1.1:1 1.1:1

30 10.110 MHz

VSWR 1.1:1 1.1:1 1:1

20 14.010 MHz

VSWR 1.1:1 1:1 1:1

15 21.010 MHz

VSWR 1.1:1 1.1:1 1.1:1

12 24.900 MHz

VSWR 1.1:1 1.1:1 1.1:1

10 28.010 MHz

VSWR 1.1:1 1.1:1 1.1:1

f (MHz)

16w .5w

16w .1w

16w .1w

16w .1w

15w .8w

14w 1.2w

13.5w 1w

Middle of band

f (MHz)

3.750 MHz
16w

7.150 MHz
16w

10.125 MHz
16w

14.175 MHz
16w

21.225 MHz
15w

24.940 MHz
14w

28.850 MHz
14w

.2w

.1w

1.2w

0w

1w

1w

1w

Top of band

f (MHz)

3.990 MHz
16w 1.2w

7.290 MHz
16w

10.140 MHz
16w

14.340 MHz
16w

21.440 MHz
15w

24.980 MHz
14w

29.690 MHz
14w

.1w

0w

0w

.1w

1w

.6w

Lowest usable fr eq uency =

2.650 MHz

Fwd = 18w

Ref = 3w

SWR = 1.4:1

Mailing: PO Box 3526, Bellevue, WA 98009

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37

8.0 Global Reference Database

To illustrate and substantiate t he re sults and performance of the
loop antennas described in this book, SGC has established a special
online database describing contacts used with this equipment. This
database will effectively inform any user of the results that they
could expect using the STEALTH Kit. Anyone can add their con­tacts made to this database for the entire world to see.

For more information on this da tabase go to www.sgcworld.com/

stealth

9.0 Conclusion

The STEALTH KIT can be used in any emergency situation and be
erected in 15 minutes. In an urgent situation, lay the SG-237 Smar­tuner and the antenna on the floor in a distorted round or square
loop of approximately 20 by 20 feet, and establish communications
immediately. Later, the antenna system can be erected following the
guidelines in this book to provide better and more reliable commu­nication.

The addition of our Global Reference Database
(www.sgcworld.com/stealth) will give first time users a better un­derstanding of the outstanding capabilities of HF Radio Communi­cation in an emergency situation or by simply co ntacting other s
around the world.

The STEALTH Kit can be used throughout the complete HF Spec­trum from 2.5 to 60 MHz in any commercial, industrial, marine,
aviation, vehicular, government, militar y or residential app lication.

38

Mailing: PO Box 3526, Bellevue, WA 98009

Shipping: 13737 SE 26th St., Bellevue, WA 98005

Toll-Free: 800-259-7331 • Phone [phone] • Fax: [phone]

www.sgcworld.com • Email: [e-mail]

© March 2002 - SGC, Inc.

10.0 Further Reading

For more information regard ing HF technology, these publications
and all of our manuals are available to download for free at
www.sgcworld.com

These publications include:

•

The HF Users Guide

•

Go Mobile at 500 Watts

•

DSP Facts and Equipment

•

Smartuners for Stealth Antennas

11.0 Special Thanks

SGC would like to thank the following people for their field tests
and feedback to create the STEALTH Kit:

•

David Allred, N1EXQ

•

Randy Davenpo rt, KA4N M A

•

Terry Dettman, WX7S

•

Gary Evans, KA4YDO

•

Bruce Franklin, KG7CR

•

David Hatch, W9ZRT

•

David Ingram, K4TWJ

•

Gordon West, WB6NOA

•

Don Wilson, N9ZGE

•

Larry Winslow, W0NFU

Mailing: PO Box 3526, Bellevue, WA 98009

Shipping: 13737 SE 26th St., Bellevue, WA 98005

Toll-Free: 800-259-7331 • Phone [phone] • Fax: [phone]

www.sgcworld.com • Email: [e-mail]

39

Notes:

40

Mailing: PO Box 3526, Bellevue, WA 98009

Shipping: 13737 SE 26th St., Bellevue, WA 98005

Toll-Free: 800-259-7331 • Phone [phone] • Fax: [phone]

www.sgcworld.com • Email: [e-mail]

© March 2002 - SGC, Inc.

Notes:

Mailing: PO Box 3526, Bellevue, WA 98009

Shipping: 13737 SE 26th St., Bellevue, WA 98005

Toll-Free: 800-259-7331 • Phone [phone] • Fax: [phone]

www.sgcworld.com • Email: [e-mail]

41

Index

12 Volt Power Source 19
Aircraft 28
Antenna
Directivity 10
Height 11
Inside 11
Installation 8
Orientation 8
Outside 11
Shape 10
Wire 17
Antenna Configurations

101 One-turn Square 12
102 One-turn Rectangle 12
103 One-turn Triangle 12
201 Two-turn Square 13
202 Two-turn Rectangle 13
203 Two-turn Triangle 13
301 Three-turn Square 14
302 Three-turn Triangle 14
401 Four-turn Square 14
402 Four-turn Triangle 14
501 One-turn Inverted Triangle 15
502 Two-turn Inverted Triangle 15
503 Three-turn Inverted Triangle

15

601 Adjustable Directive Loop 21-26

Appendix 30-37
Cable extensions 8
Camper 29
Coaxial Connector 19
Coupler 17

Connection Point
Power leads

17

14

Connectors 8

High end frequency test 36
Horizontal Plane 9
Installation 7
Light Bulb 19, 21
Loop Antenna
One-turn 12, 31,
33
Two-turn 10, 13,
20
Three-turn 14, 20,
32, 34
Four-turn Loop 14, 35
Polarization 9
Radiating 19
RF Burn 19
Sample Installation 15
Smartuner 7, 19

(Smartuner is a registered trademark of SGC)

Specifications 6
Supplied Items 7, 43
Support Clip 16
Support Ropes 15, 17,
18, 20
Vertical Plane 9, 11
Warranty 29

Environment 11
Helicopter 29

42

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www.sgcworld.com • Email: [e-mail]

© March 2002 - SGC, Inc.

Supplied Items

SG-237 Smartuner HF An­tenna coupler and manual.

4 - antenna mounting clips
and 20’ (6m) ropes attached

30’ (9.1m) of nylon support
rope with clip

80’ (25m) of antenna wire

2 - spare antenna mounting
clips

12 - Reusable cable ties

Mailing: PO Box 3526, Bellevue, WA 98009

Shipping: 13737 SE 26th St., Bellevue, WA 98005

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www.sgcworld.com • Email: [e-mail]

43