Chameleon Antenna CHA F-LOOP 3.0 User manual

CHA F-LOOP 3.0 Page 1
HF Portable Loop Antenna 3.0
(CHA F-LOOP 3.0)
Operator’s Manual
Nevada - USA
WWW.CHAMELEONANTENNA.COM
VERSATILE –DEPENDABLE –STEALTH –BUILT TO LAST

CHA F-LOOP 3.0 Page 2
Table of Contents
Introduction ..............................................................................................................................................2
HF Propagation .........................................................................................................................................4
Parts of the Antenna.................................................................................................................................6
Standard Single Flexible Loop Assembly (CHA F-LOOP 3.0 BASIC) ...........................................................9
Double Flexible Loop Assembly (CHA F-LOOP 3.0 BASIC).......................................................................10
Flexible Booster Loop Assembly (CHA F-LOOP 3.0 TOTAL).....................................................................11
Rigid Radiator Loop Assembly (CHA F-LOOP 3.0 PLUS) ..........................................................................12
Power Compensator Installation ............................................................................................................13
Loop Operation.......................................................................................................................................14
Disassembly.............................................................................................................................................15
Troubleshooting......................................................................................................................................15
Preventive Maintenance.........................................................................................................................16
Specifications ..........................................................................................................................................16
Accessories..............................................................................................................................................17
Chameleon AntennaTM Products............................................................................................................18
References ..............................................................................................................................................18

CHA F-LOOP 3.0 Page 3
Introduction
Thank you for purchasing and using the Chameleon AntennaTM High Frequency (HF) Portable Loop
Antenna 3.0 (CHA F-LOOP 3.0). The unique craftsmanship of the CHA F-LOOP 3.0 distinguishes itself from
the competition. You are now part of the magnetic loop HF antenna craze that is sweeping the amateur
radio community. The CHA F-LOOP 3.0 is available in three models:
1. CHA F-LOOP BASIC 3.0 –Standard and extended length flexible magnetic loop antenna covering
2.8 –29.7 MHz (80 through 10 meter amateur bands);
2. CHA F-LOOP 3.0 PLUS –Same as BASIC model, but also includes a super high-efficiency two-piece
rigid aluminum radiator loop;
3. CHA F-LOOP 3.0 TOTAL –Same as BASIC model, but also includes a larger 48 inch diameter booster
flexible loop and coupling loop to improve performance from 4.0 - 23.1 MHz (40 through 15 meter
amateur bands).
Easily deployable HF magnetic loop antennas, also called small transmitting loops, have been routinely
used for many years in professional defense, military, diplomatic, and shipboard HF communication links,
where robust and reliable general coverage radio communication is deemed mandatory. These antennas
have only recently become commercially available for amateur radio.
You will be amazed by the performance of this antenna. The real practical advantage of the small loop,
compared to a short vertical whip tuned against earthor a full-sized vertical antenna, is the loop’s freedom
from dependence on a ground plane and earth for achieving efficient operation; this unique characteristic
has profound significance for small, restricted space antenna operation. In comparison, the bottom of a
vertically oriented the loop does not need to be more than a loop diameter above ground making it very
easy to install in a restricted location. There is no significant improvement in performance when a small
loop is raised to great heights; all that matters is the loop is substantially clear of objects in the immediate
area and oriented towards the desired direction of radiation.
Field trials of the CHA F-LOOP 3.0 (BASIC model
shown in plate [1]), demonstrated that an inside
magnetic loop antenna was only around one to
two S-units lower, on both transmit and receive,
than an outside full-size quarter wave vertical
antenna. Remarkable for an antenna that is less
than three foot in diameter and covers the 80 –
10 meter ham bands!
The magnetic loop is different than typical
antennas because it emphasizes the magnetic
part of the radio wave (H field) rather than the
electric part (E field) of the radio wave. It also
has a high Q (bandwidth of 17 KHz on 40 meters)
providing immunity from interference outside
the bandpass. The CHA F-LOOP 3.0 Antenna was
designed with weight, portability, versatility and
Plate 1. CHA F-LOOP 3.0 BASIC.

CHA F-LOOP 3.0 Page 4
cost in mind, and is ideal for RVs, hotels, apartments, condominiums, townhouses, and places with
restrictions where it is not feasible to erect a multi-band wire or vertical antenna.
The CHA F-LOOP BASIC 3.0, shown in plate (1), is
comprised of a three-foot diameter flexible
radiator loop, a coupling loop, a specially
designed smaller tuning unit, new-style twist-
lock telescoping mast, and coaxial feedline –all
of which fit in the supplied military-style duffel
bag.
The CHA F-LOOP 3.0 PLUS, shown in plate (2), has
all the components and features of the BASIC
model, plus a super high efficiency two-piece
rigid aluminum radiator loop.
The CHA F-LOOP 3.0 TOTAL, not pictured, has all
the components and features of the BASIC
model, plus a larger four-foot diameter booster
flexible loop and coupling loop that improves
performance in the 40 –15 meter amateur
service bands.
Plate (2). CHA F-LOOP 3.0 PLUS.
The CHA F-LOOP 3.0 doesn’t require a ground-plane and doesn’t need to be mounted up high. Do not use
an antenna tuner or coupler, as it may cause you to mistune the antenna.
Antennas built by Chameleon AntennaTM are versatile, dependable, stealthy, and built to last. Please read
this operator’s manual so that you may maximize the utility you obtain from your CHA F-LOOP 3.0
antenna.
HF Propagation
HF radio provides relatively inexpensive and reliable local, regional, national, and international voice and
data communication capability. It is especially suitable for undeveloped areas where normal
telecommunications are not available, too costly or scarce, or where the commercial telecommunications
infrastructure has been damaged by a natural disaster or military conflict.
Although HF radio is a reasonably reliable method of communication, HF radio waves propagate through
a complex and constantly changing environment and are affected by weather, terrain, latitude, time of
day, season, and the 11-year solar cycle. A detailed explanation of the theory of HF radio wave
propagation is beyond the scope of this operator’s manual, but an understanding of the basic principles
will help the operator decide what frequency will support their communication requirements.
HF radio waves propagate from the transmitting antenna to the receiving antenna using two methods:
ground waves and sky waves.

CHA F-LOOP 3.0 Page 5
Ground waves are composed of direct waves and surface waves. Direct waves travel directly from the
transmitting
antenna to the receiving antenna when they are within the radio line-of-sight. Typically, this distance is 8
to 14 miles for field stations. Surface waves follow the curvature of the Earth beyond the radio horizon.
They are usable, during the day and under optimal conditions, up to around 90 miles, see table (1). Low
power, horizontal antenna polarization, rugged or urban terrain, dense foliage, or dry soil conditions can
reduce the range very significantly. The U.S. Army found that in the dense jungles of Vietnam, the range
for ground waves was sometimes less than one mile.
Frequency
Distance
Frequency
Distance
2 MHz
88 miles
14 MHz
33 miles
4 MHz
62 miles
18MHz
29 miles
7 MHz
47 miles
24 MHz
25 miles
10 MHz
39 miles
30 MHz
23 miles
Table 1. Maximum Surface Wave Range by Frequency.
Sky waves are the primary method of HF radio wave propagation. HF radio waves on a frequency below
the critical frequency (found by an ionosonde) are reflected off one of the layers of the ionosphere and
back to Earth between 300 and 2,500 miles, depending upon the frequency and ionospheric conditions.
HF radio waves can then be reflected from the Earth to the ionosphere again during multi-hop propagation
for longer range communication. The most important thing for the operator to understand about HF radio
wave propagation is the concept of Maximum Usable Frequency (MUF), Lowest Usable Frequency (LUF),
and Optimal Working Frequency (OWF). The MUF is the frequency for which successful communications
between two points is predicted on 50% of the days of in a month. The LUF is the frequency below which
successful communications are lost due to ionospheric loses. The OWF, which is somewhere between the
LUF and around 80% of the MUF, is the range of frequencies which can be used for reliable
communication. If the LUF is above the MUF, HF sky wave propagation is unlikely to occur.
The HF part of the Radio Frequency (RF) spectrum is usually filled with communications activity and an
experienced operator can often determine where the MUF is, and with less certainty, the LUF by listening
to where activity ends. The operator can then pick a frequency in the OWF and attempt to establish
contact. Another method is using HF propagation prediction software, such as the Voice of America
Coverage Analysis Program (VOACAP), which is available at no cost to download or use online at
www.voacap.com.The operator enters the location of the two stations and the program show a wheel
with the predicted percentage of success based on frequency and time. ALE, which is the standard for
interoperable HF communications, is an automated method of finding a frequency in the OWF and
establishing and maintaining a communications link.
Even under optimal conditions, there is a gap between where ground waves end (around 40 to 90 miles)
and the sky wave returns to Earth on the first hop (around 300 miles). NVIS propagation can be used to
fill this gap. The frequency selected must be below the critical frequency, so NVIS is can normally only be

CHA F-LOOP 3.0 Page 6
used on frequencies from around 2 to 10 MHz. Frequencies of 2 –4 MHz are typical at night and 4 –8
MHz during the day.
A magnetic loop antenna radiates at all angles from horizon to zenith, making it an equally effective
antenna for both local and long-distance (DX) communication. While not specifically designed for NVIS,
during field testing of the CHA F-LOOP 3.0, both DX and NVIS contacts were made on the 30 meter ham
band within minutes of each other.
Parts of the Antenna
The CHA F-LOOP 3.0 is comprised of the following components, see plates (3) and (4):
Plate 3. CHA F-LOOP 3.0 Antenna Components.
a. Tuning Unit –The Tuning Unit adjusts the resonant frequency of the CHA F-LOOP 3.0 antenna.
b. Flexible Radiator Loop - The Flexible Radiator Loop consists of a 34 inch diameter / 102 inch
length of shorted coaxial cable with UHF Plugs (PL-259) at both ends.

CHA F-LOOP 3.0 Page 7
c. Coupling Loop - The Coupling Loop is a 6 1/2 inch diameter rigid aluminum loop, which is
attached to the end of the Telescoping Mast (g) and used in the CHA F-LOOP BASIC 3.0 and CHA
F-LOOP 3.0 PLUS antenna configurations. A larger, 8 inch diameter rigid aluminum loop, is used
in conjunction with the Booster Flexible Loop (e) in the CHA F-LOOP 3.0 TOTAL antenna
configuration.
Plate 4. CHA F-LOOP 3.0 Tuning Unit Details.
d. Flexible Radiator Loop Extension - The Flexible Radiator Loop Extension consists of a 102 inch
length of shorted coaxial cable with UHF Plugs at both ends. The Flexible Radiator Loop
Extension enables the CHA F-LOOP 3.0 BASIC to operate the 80 meter ham band.
e. Flexible Booster Loop (included with TOTAL model) - The Flexible Booster Loop consists of a 48
inch diameter / 146 inch length of shorted coaxial cable with UHF Plugs at both ends and is
designed to increase CHA F-LOOP 3.0 TOTAL performance in the 60 through 15 meter ham
bands.
f. Flexible Radiator Loop Connections - The Flexible Radiator Loop Connections are UHF sockets
(SO-239) located on the right and left sides of the Tuning Unit (a).
g. Telescoping Mast - The Telescoping Mast attaches the Tuning Unit (a) to the Coupling Loop (c).
h. Tuning Knob - The Tuning Knob is located on the front of the Tuning Unit (a) and is used to adjust
the resonant frequency of the loop. The tuning capacitor rotates a total of around 2 ¾
revolutions. Left, or counter-clockwise, increases the resonant frequency of the antenna. Right,
or clockwise, decreases the resonant frequency of the antenna.
i. Band Switch - The Band Switch is located on the top of the Tuning Unit (a). It has two positions,
marked “A” and “B”. “A” is the Low Range and “B” is the High Range. See the section “Loop
Operation” for more details on operation of the Band Switch.

CHA F-LOOP 3.0 Page 8
j. Coupling Loop Attachment - The Coupling Loop Attachment is used to attach the Coupling
Loop (c) to the top of the Telescoping Mast (g).
k. Coupling Loop Adjustment - The Coupling Loop Adjustment is used to tighten the Coupling
Loop Attachment (j).
l. Loop Connection - The Loop Connection is a UHF socket located on the bottom of the Coupling
Loop (c) used to attach the Coaxial Cable (m).
m. Coaxial Cable - The Coaxial Cable (not shown) is a 12 foot length of RG-58 coaxial cable, with an
RF isolator at the antenna end, used to connect the CHA F-LOOP 3.0 Antenna to your radio set.
n. Aluminum Base Plate - The Aluminum Base Plate is on the bottom of the Tuning Unit (a). It is
used to provide a stable base for placing the CHA F-LOOP 3.0 on a flat surface, such as a table,
or to mount the CHA F-LOOP 3.0 to a heavy-duty camera tripod or an 3/8”antenna mount.
o. Rigid Radiator Loop (included with PLUS model) - The Rigid Radiator Loop (not pictured) is a
super high efficiency two-piece aluminum radiator loop included with the PLUS model.
p. Rigid Radiator Loop Mounts - The Rigid Radiator Loop Mounts are used to attach the Rigid
Radiator Loop (o) to the Tuning Unit (a).
q. Telescoping Mast Stud - The Telescoping Mast Stud is located on top of the Tuning Unit (a) and
is used to attach the Telescoping Mast (g) to the Tuning Unit.
r. Loop Extension Barrel Connector - The Loop Extension Barrel Connector is a double-female
UHF connector (SO-239) used to join the Flexible Radiator Loop (b) to the Flexible Radiator
Loop Extension (d), which enables the CHA F-LOOP 3.0 to operate the 80 meter ham band.
s. Power Compensator (optional) - The optional Power Compensator attaches to Flexible
Radiator Loop Connection (f) on the left side of the Tuning Unit (a). It is used to increase the
power handling capability of the CHA F-LOOP 3.0.
t. Camera Tripod Mount - The Camera Tripod Mount is used to mount the CHA F-LOOP 3.0 to a
heavy-duty camera tripod using a ¼” x 20 standard camera tripod stud. There are two
threaded Camera Tripod Mounts in the Aluminum Base Plate (n), one in the center and one
near the back edge. Either may be used.
A ¼” x 20 to 3/8” x 24 adapter (CHA SS ADAPTER) is available for purchase to enable use of the
CHA SPIKE MOUNT, CHA JAWMOUNT, or CHA UCM optional high-quality antenna mounts.

CHA F-LOOP 3.0 Page 9
u. 3/8” Antenna Mount - The 3/8” Antenna Mount is an unthreaded hole at the rear of the
Aluminum Base Plate (n) that enables attachment of the CHA F-LOOP 3.0 to any 3/8” antenna
mount using a 3/8” x 24 hex bolt.
v. Duffel Bag –The military-style Duffel Bag (not shown), is included with all models and is used to
store the components of the CHA F-LOOP 3.0 when not deployed. It is incredibly versatile and
can also be used as a backpack.
Standard Single Flexible Loop Assembly (CHA F-LOOP 3.0 BASIC)
The Standard Single Flexible Loop configuration uses the standard Flexible Radiator Loop (b) and small
Coupling Loop (c) included with the CHA F-LOOP 3.0 BASIC, CHA FLOOP 3.0 PLUS, and CHA F-FLOOP 3.0
TOTAL antennas.
The CHA F-LOOP 3.0 BASIC antenna should be installed near the radio set; either indoors or in a sheltered
outside area, such as a balcony or porch. Because the magnetic component of an electromagnetic wave
is maximum at the boundary between the ground and the space above, loop performance is usually best
when the loop is located near the ground at a distance outside of the loop’s close-in induction field (just
a loop diameter or two). The CHA F-LOOP 3.0 BASIC is not waterproof and must be installed in an area
protected from the weather. Do not use an antenna tuner or coupler with this antenna, as it may cause
you to mistune the antenna.
Perform the following steps to assemble the Standard Single Flexible Loop configuration.
1. Select a location to setup the CHA F-LOOP
3.0 BASIC antenna. The location can be
indoors or in an outdoors area protected
from the weather. The location must
facilitate accessibility by the operator to the
Tuning Knob (h). The operator needs to be
able to adjust the Tuning Knob while
listening to the receiver, activating the
transmitter, and observing the SWR meter.
If used indoors, the location should also be
reasonably away from switching power
supplies, Internet routers, and other sources
of electrical and electronic interference.
2. Remove the CHA F-LOOP 3.0 BASIC
components from the Duffel Bag (v).
3. Attach the Telescoping Mast (g) to the
Tuning Unit (a) by screwing the bottom of
the Telescoping Mast onto the Telescoping
Mast Stud (q), located on the top of the
Tuning Unit. Tighten snuggly, by gripping the
base of the Telescoping Mast and turning
clockwise. Do not grip the mast tubing or
use tools when tightening.
4. Attach the small 6 ½ inch Coupling Loop (c)
to the Coupling Loop Attachment (j), located
at the top of the Telescoping Mast, by
placing the threaded hole in the Coupling
Loop bracket over the Coupling Loop
Attachment stud and turning the Coupling
Loop Adjustment (k) knob until snug. The
UHF connector should be in front of the
Telescoping Mast and point down, as shown
in the upper-left inset of Plate (3).
5. Extend the Telescoping Mast sections so that
the Telescoping Mast is 24 inches in length.
6. Connect one end of the Flexible Radiator
Loop (b) to the left Radiator Loop
Connection (f).

CHA F-LOOP 3.0 Page 10
7. Connect the other end of the Flexible
Radiator Loop to the right Radiator Loop
Connection.
8. Secure the top middle of the Flexible
Radiator Loop to the top middle of the
Coupling Loop with one of the attached
Sticky Straps.
9. Shape the Flexible Radiator Loop into a
circular shape. The Coupling Loop and
Flexible Radiator Loop should be in the same
plane.
10. Place the CHA F-LOOP 3.0 BASIC on a flat
surface, such as a tabletop, or attach the
Aluminum Base Plate (n) to a heavy-duty
camera tripod or other compatible antenna
mount (see the Accessories section for a list
of compatible 3/8”antenna mounts
available from Chameleon AntennaTM).
11. Connect the Coaxial Cable (m) to the Loop
Connection (l).
12. Secure the Coaxial Cable Feedline along the
Telescoping Mast to ensure easy tuning and
consistent low SWR.
13. Perform an operational test (see section on
Loop Operation).
Double Flexible Loop Assembly (CHA F-LOOP 3.0 BASIC)
The Double Single Flexible Loop configuration uses the standard Flexible Radiator Loop, Flexible Radiator
Loop Extension (d) and small Coupling Loop included with the CHA F-LOOP 3.0 BASIC, CHA FLOOP 3.0
PLUS, and CHA F-FLOOP 3.0 TOTAL.
The CHA F-LOOP 3.0 Double Flexible Loop configuration allows you to use the CHA F-LOOP 3.0 on the 80
meter ham band by extending the lower frequency of the CHA F-LOOP 3.0 down to 2.8 MHz. See Plate
(5) and perform the following steps.
Plate 5. Double Flexible Loop Antenna.
(CHA F-LOOP 2.0 shown)
1. Perform assembly of the Standard Single
Flexible Loop configuration.
2. Disconnect one end of the Flexible Radiator
Loop (b) “Loop 1” from one of the Flexible
Radiator Loop Connections (f).
3. Connect the free end of the Flexible Radiator
Loop “Loop 1” to the Loop Extension Barrel
Connector (r).
4. Connect one end of the Flexible Radiator
Loop Extension (d) “Loop 2” to the open
Flexible Radiator Loop Connection from step
2.
5. Form the Flexible Radiator Loop Extension
“Loop 2” into a loop, like the Flexible
Radiator Loop “Loop 1”.
6. Attach the top of the Flexible Radiator Loop
Extension “Loop 2” to the top of the
Coupling Loop (c) using the attached sticky
strap.

CHA F-LOOP 3.0 Page 11
7. Connect the free end of the Flexible Radiator
Loop Extension “Loop 2” to the open end of
the Loop Extension Barrel Connector.
8. Set Band Switch (i) to the “A” position.
9. Perform an operational test (see section on
Loop Operation).
Flexible Booster Loop Assembly (CHA F-LOOP 3.0 TOTAL)
The CHA F-LOOP 3.0 TOTAL uses the Flexible Booster Loop (e) and a large Coupling Loop to increase
performance in the 60 to 15 meter ham bands. The CHA F-LOOP 3.0 TOTAL antenna should be installed
near the radio set; either indoors or in a sheltered outside area, such as a balcony or porch. Because the
magnetic component of an electromagnetic wave is maximum at the boundary between the ground and
the space above, loop performance is usually best when the loop is located near the ground at a distance
outside of the loop’s close-in induction field (just a loop diameter or two). The CHA F-LOOP 3.0 TOTAL is
not waterproof and must be installed in an area protected from the weather. Do not use an antenna
tuner with this antenna, as it may cause you to mistune the antenna.
Perform the following steps to assemble the Flexible Booster Loop Antenna, see plates (2) and (3).
1. Select a location to setup the CHA F-LOOP
3.0 TOTAL antenna. The location can be
indoors or in an outdoors area protected
from the weather. The location must
facilitate accessibility by the operator to the
Tuning Knob (h). The operator needs to be
able to adjust the Tuning Knob while
listening to the receiver, activating the
transmitter, and observing the SWR meter.
If used indoors, the location should also be
reasonably away from switching power
supplies, Internet routers, and other sources
of electrical and electronic interference.
2. Remove the CHA F-LOOP 3.0 TOTAL
components from the Duffel Bag (v).
3. Attach the Telescoping Mast (g) to the
Tuning Unit (a) by screwing the bottom of
the Telescoping Mast onto the Telescoping
Mast Stud (q), located on the top of the
Tuning Unit. Tighten snuggly, by gripping the
base of the Telescoping Mast and turning
clockwise. Do not grip the mast tubing or
use tools when tightening.
4. Attach the large 8 inch Coupling Loop (c) to
the Coupling Loop Attachment (j), located at
the top of the Telescoping Mast, by placing
the threaded hole in the Coupling Loop
bracket over the Coupling Loop Attachment
stud and turning the Coupling Loop
Adjustment (k) knob until snug. The UHF
connector should be in front of the
Telescoping Mast and point down, as shown
in the upper-left inset of Plate (3).
5. Fully extend the Telescoping Mast sections.
6. Connect one end of the Flexible Booster
Loop (e) to the left Radiator Loop Connection
(f).
7. Connect the other end of the Flexible
Booster Loop to the right Radiator Loop
Connection.
8. Secure the top middleof the Flexible Booster
Loop to the top middle of the Coupling Loop
with one of the attached Sticky Straps.
9. Shape the Flexible Booster Loop into a
circular shape. The Coupling Loop and
Flexible Booster Loop should be in the same
plane.
14. Place the CHA F-LOOP 3.0 TOTAL on a flat
surface, such as a tabletop, or attach the
Aluminum Base Plate (n) to a heavy-duty
camera tripod or other compatible antenna
mount (see the Accessories section for a list

CHA F-LOOP 3.0 Page 12
of compatible 3/8”antenna mounts
available from Chameleon AntennaTM).
10. Connect the Coaxial Cable Feedline (m) to
the Loop Connection (l).
11. Secure the Coaxial Cable Feedline along the
Telescoping Mast to ensure easy tuning and
consistent low SWR.
15. Perform an operational test (see section on
Loop Operation).
Rigid Radiator Loop Assembly (CHA F-LOOP 3.0 PLUS)
The CHA F-LOOP 3.0 PLUS uses the Rigid Radiator Loop (o) and the small Coupling Loop to improve
efficiency in the 40 to 10 meter ham bands. The CHA F-LOOP 3.0 PLUS antenna should be installed near
the radio set; either indoors or in a sheltered outside area, such as a balcony or porch. Because the
magnetic component of an electromagnetic wave is maximum at the boundary between the ground and
the space above, loop performance is usually best when the loop is located near the ground at a distance
outside of the loop’s close-in induction field (just a loop diameter or two). The CHA F-LOOP 3.0 PLUS is
not waterproof and must be installed in an area protected from the weather. Do not use an antenna
tuner with this antenna, as it may cause you to mistune the antenna.
Perform the following steps to assemble the Rigid Radiator Loop Antenna, see plate (6).
1. Select a location to setup the CHA F-LOOP
3.0 PLUS antenna. The location can be
indoors or in an outdoors area protected
from the weather. The location must
facilitate accessibility by the operator to the
Tuning Knob (h). The operator needs to be
able to adjust the Tuning Knob while
listening to the receiver, activating the
transmitter, and observing the SWR meter.
If used indoors, the location should also be
reasonably away from switching power
supplies, Internet routers, and other sources
of electrical and electronic interference.
2. Remove the CHA F-LOOP 3.0 PLUS
components from the Duffel Bag (v).
3. Attach the Telescoping Mast (g) to the
Tuning Unit (a) by screwing the bottom of
the Telescoping Mast onto the Telescoping
Mast Stud (q), located on the top of the
Tuning Unit. Tighten snuggly, by gripping the
base of the Telescoping Mast and turning
clockwise. Do not grip the mast tubing or
use tools when tightening.
4. Attach the small 6 1/2 inch Coupling Loop (c)
to the Coupling Loop Attachment (j), located
at the top of the Telescoping Mast, by
placing the threaded hole in the Coupling
Loop bracket over the Coupling Loop
Attachment stud and turning the Coupling
Loop Adjustment (k) knob until snug. The
UHF connector should be in front of the
Telescoping Mast and point down, as shown
in the inset of Plate (3).
Plate 6. Rigid Radiator Loop Assembly.

CHA F-LOOP 3.0 Page 13
(F-LOOP 2.0 shown)
5. Extend the Telescoping Mast sections so that
the Telescoping Mast is 24 inches in length.
6. Attach the flange at the bottom of one end
of the Rigid Radiator Loop (o) to the left Rigid
Radiator Loop Mount (p) using the hardware
provided. Do not tighten.
7. Attach the flange and the bottom of the
other end of the Rigid Radiator Loop to the
right Rigid Radiator Loop Mount using the
hardware provided. Tighten the wing nuts
on both sides of the loop finger tight.
8. Secure the top middle of the Rigid Radiator
Loop to the top middle of the Coupling Loop
with one of the attached Sticky Straps. The
Coupling Loop and Rigid Radiator Loop
should be in the same plane.
16. Place the CHA F-LOOP 3.0 PLUS on a flat
surface, such as a tabletop, or attach the
Aluminum Base Plate (n) to a heavy-duty
camera tripod or other compatible antenna
mount (see the Accessories section for a list
of compatible antenna mounts available
from Chameleon AntennaTM).
9. Connect the Coaxial Cable Feedline (m) to
the Loop Connection (l).
10. Secure the Coaxial Cable Feedline along the
Telescoping Mast to ensure easy tuning and
consistent low SWR.
17. Perform an operational test (see section on
Loop Operation).
Power Compensator Installation
The optional Power Compensator will increase the power handling capability of the CHA F-LOOP 3.0 BASIC
or TOTAL to 60W intermittent duty cycle (SSB telephony) and 25W continuous duty cycle (CW, AM, FM,
RTTY, and SSB-based digital). To install the Power Compensator, place the bracket of the Power
Compensator (s) over the left Flexible Radiator Loop Connection (f) and position the canister as shown in
Plate (7).
Plate 7. Power Compensator.
CAUTION: When using the Power Compensator,
exceeding the specified power limits or
prolonged transmission with an SWR above 3.0:1
will permanently damage the internal
components of the Power Compensator. Also,
dropping or rough handling the Power
Compensator will permanently damage the
internal components. Damage caused by these
conditions is not covered by the warranty.

CHA F-LOOP 3.0 Page 14
Loop Operation
The CHA F-LOOP 3.0 is very easy to use. Perform the following steps whenever you change frequency.
1. The CHA F-LOOP 3.0 is bidirectional
favoring the sides, see plate (8). If
possible, point one side toward the
target signal and rotate the antenna for
maximum signal strength.
Plate 8. CHA F-LOOP Antenna Directivity.
2. Set the Band Switch (i) to the desired
frequency range. The Band Switch
Label, shown in figure (1), symbolically
depicts the typical Band Switch setting
for the operating frequency range when
using the Standard antenna
configuration.
Figure 1. Band Switch Label.
Table (2) shows the more precise
frequency range for each antenna
configuration and switch setting. If the
desired operating frequency is in both
positions, “A”is preferrable.
Table 2. “A/B” Frequency Ranges.
3. Adjust the Tuning Knob (h) for maximum
receive signal strength. Turn the Tuning
Knob counterclockwise to decrease the
resonant frequency, see Plate (9).
Plate 9. CHA F-LOOP Antenna Tuning.
You will know when you are close to
resonant frequency because you will
start hearing signals and a marked
increase in receiver background noise.
The Tuning Knob uses a 6:1 reduction
drive which allows for fine adjustment
and will rotate approximately 2¾
revolutions from lowest to highest
frequency. Although the mechanism

CHA F-LOOP 3.0 Page 15
includes a clutch to prevent damage, you
should not force the knob past the stops.
4. Ensure your transmitter is set for no
more than 5 Watts during tuning.
5. Transmit a carrier and gradually turn the
Tuning Knob counterclockwise and then
clockwise, around the highest receive
signal point found in step 3, to obtain the
lowest SWR. An SWR of 3.0:1 or less is
satisfactory. Your hand may slightly
influence the resonance of the loop
while turning the Tuning Knob. This is
completely normal, and you may have to
“touch up” the adjustment slightly. The
bandwidth of the loop at 60 meters is
only 8 KHz, so once you are close to
resonance, make only the slightest of
Tuning Knob adjustments.
6. Increase transmitter power to no more
than 25 Watts, see specifications.
Disassembly
1. Disconnect Coaxial Cable and neatly coil cable.
2. If used, disconnect Flexible Radiator Loop, carefully coil loop, and secure with attached sticky strap.
3. If used, disconnect Flexible Radiator Loop Extension, carefully coil loop, and secure with attached
sticky strap.
4. If used, detach the Flexible Booster Loop and secure pieces with attached sticky straps.
5. If used, un-attach the Rigid Radiator Loop. Re-install the hardware in the Rigid Radiator Loop
flanges, so they do not get lost.
6. Fully collapse Telescoping Mast.
7. Remove Coupling Loop from the Telescoping Mast.
8. Remove the Telescoping Mast from the Tuning Unit.
9. Clean and inspect antenna components and then place them into the Duffel Bag.
10. The antenna is now ready for transport and storage.
Troubleshooting
1. Ensure the loop is away from metal surfaces. Sometimes simply reorienting, relocating, or elevating
the loop around two to four feet higher will reduce the SWR.
2. Ensure Radiator Loop Connections are securely tightened.
3. Inspect Flexible Radiator Loop for damage. Replace if damaged.
4. Ensure the Coaxial Cable Connection is securely tightened to the Loop Connection.
5. Inspect the Coaxial Cable Feedline for cuts in insulation or exposed shielding. Replace if damaged.
6. Ensure Band Switch is set for your frequency range.
7. Turn Tuning Knob fully counterclockwise.
8. Slowly adjust the Tuning Knob over entire range listening for a marked increase in received signal
strength and receiver background noise.
9. If still not operational, replace the Coaxial Cable Feedline. Most problems with antenna systems are
caused by the coaxial cables and connectors.
10. If still not operational, contact us for technical support.

CHA F-LOOP 3.0 Page 16
Preventive Maintenance
Like all our products, the CHA P-LOOP 3.0 is built to be rugged, long lasting and with details in mind. The
craftsmanship of the system is unique to Chameleon AntennaTM.The materials used in this antenna are
water and rust resistant and do not require preventive maintenance, but they should be inspected for
damage and cleaned with mild household cleaners after field use.
Specifications
•Frequency:
CHA F-LOOP 3.0 BASIC: Standard Flexible Loop: approximately 4.7 –29.7 MHz (60 through 10
meter ham bands), Double Flexible Loop: approximately 2.8 –11.9 MH (80 through 30 meter
ham bands),
CHA F-LOOP 3.0 PLUS: Rigid Radiator Loop: not measured, but guaranteed 5.4 to 29.7 MHz (60
through 10 meter ham bands).
CHA F-LOOP 3.0 TOTAL: Flexible Booster Loop: approximately 4.0 - 23.1 MHz (60 through 15
meter ham bands).
•Power: 25W intermittent duty cycle (SSB telephony), 10W continuous duty cycle (CW, AM, FM,
RTTY, and other digital modes).
•Diameter: 34 inches (Standard Loop), 48 inches (Booster Loop), 36 inches (Rigid Loop)
•Ingress Protection: Not water resistant. Equivalent to IP30 (not tested).
•RF Connection: UHF Plug (PL-259)
•Color: Black and Gray
•SWR: Operator tunable, typically not greater than 3.0:1 at resonance.
•Table (3) shows typical 2:1 bandwidth for the three antenna configurations. Note: The
bandwidth of the Rigid Loop was not measured but should be comparable to the Standard
configuration.
BAND
2:1 SWR BANDWIDTH (KHZ)*
STANDARD
DOUBLE
BOOSTER
80
-
6
-
60
8
12
-
40
17
14
16
30
27
28
30
20
40
-
60
17
60
-
90
15
100
-
140
12
160
-
-
10
210
-
-
*Bandwidth may vary
Table 3. 2:1 SWR Bandwidth.
•Weight: 4 lbs.
•Personnel Requirements and Setup Time: one operator, around 2 minutes.
•IMPORTANT: Do not use an antenna tuner or coupler with this antenna!

CHA F-LOOP 3.0 Page 17
Accessories
The following accessories are available for purchase from Chameleon AntennaTM. Please contact us at
[e-mail] for current prices and availability.
•CHA SS ADAPTER –Stainless steel adapter that converts ¼”x 20 camera tripod to 3/8”x 24
antenna mount.
•CHA JAWMOUNT - The Chameleon Jaw Mount has been assembled to offer portable antenna
versatility for Chameleon Antenna owners. The mount orientation can easily be changed with a
simple 3/16 Allen Key.
•CHA UCM - The CHA UCM is by far the ultimate mounting system on the market. Durable, and
perfect for use in semi-permanent or portable installations. Quick, easy installation, and
removal. The Easy up UCM lets you easily mount your antenna, to virtually any flat surface.
•CHA SPIKE MOUNT - The CHA SPIKE MOUNT is an innovative product built exclusively by the
skilled machinists at Chameleon AntennaTM. It is a precision fabricated heavy-duty stainless-steel
stake with a fitting for attaching a counterpoise. It is rugged and highly portable and enables
easy ground mounting of Chameleon antenna systems.
•CHA POWER COMPENSATOR - The CHA PC is built exclusively by Chameleon Antenna and
increases the power handling capability of all Chameleon Antenna magnetic loop antennas by
about 2 1⁄2 times.
•Booster Kit. Includes a 48 inch diameter / 146 inch long shorted coaxial cable loop and a 8 inch
rigid coupling loop, which increases CHA F-LOOP 3.0 efficiency from 60 to 15 meters. (This kit is
included with the CHA F-LOOP 3.0 TOTAL)
•Power Compensator. Increases power handling of the CHA F-LOOP 3.0 from 25W to 60W for SSB
telephony.
Recommended non-supplied accessories:
•SWR Power Meter.
•Heavy-Duty Tripod.

CHA F-LOOP 3.0 Page 18
Chameleon AntennaTM Products
Please go to http://chameleonantenna.com for information about additional quality antenna products available
for purchase from Chameleon AntennaTM –The Portable Antenna Pioneer.
References
1. Silver, H. Ward (editor), 2013, 2014 ARRL Handbook for Radio Communications, 91st Edition, American Radio
Relay League, Newington, CT.
2. 1987, Tactical Single-Channel Radio Communications Techniques (FM 24-18), Department of the Army,
Washington, DC.
3. Turkes, Gurkan, 1990, Tactical HF Field Expedient Antenna Performance Volume I Thesis, U.S. Naval Post
Graduate School, Monterey, CA.