Chameleon Antenna CHA F-LOOP 2.0 User manual

HF Portable Loop Antenna 2.0
(CHA F-LOOP 2.0)
and
(CHA F-LOOP 2.0 PLUS)
Operator’s Manual
California - USA
WWW.CHAMELEONANTENNA.COM
VERSATILE –DEPENDABLE –STEALTH –BUILT TO LAST

CHA F-LOOP 2.0 Page 2
Table of Contents
Introduction ..............................................................................................................................................3
HF Propagation .........................................................................................................................................3
Parts of the Antenna.................................................................................................................................5
Standard Single Flexible Loop Assembly...................................................................................................8
Double Flexible Loop Assembly ................................................................................................................9
High-Efficiency Loop Assembly ...............................................................................................................10
Power Compensator Installation ............................................................................................................11
Loop Operation.......................................................................................................................................12
Disassembly.............................................................................................................................................13
Troubleshooting......................................................................................................................................13
Preventive Maintenance.........................................................................................................................13
Specifications ..........................................................................................................................................13
Accessories..............................................................................................................................................14
Chameleon AntennaTM Products............................................................................................................15
References ..............................................................................................................................................16
WARNING! Never mount this, or any other antenna near power lines or utility wires! Any materials:
ladders, ropes, or feedlines that contact power lines can conduct voltages that kill. Never trust insulation to
protect you. Stay away from all power lines.
WARNING! Never operate this antenna where people could be subjected to high levels of RF exposure,
especially above 10 watts or above 14 MHz. Never use this antenna near RF sensitive medical devices, such as
pacemakers.
WARNING! A tuned loop can exhibit several hundred Volts and concentrated electromagnetic radiation
when operating at QRP power levels (5-10 W). At higher RF levels, several thousand volts will be present at
resonance! Exercise caution when using this antenna. Operate this antenna at your own risk.
All information on this product and the product itself is the property of and is proprietary to Chameleon
AntennaTM. Specifications are subject to change without prior notice.

CHA F-LOOP 2.0 Page 3
Introduction
Thank you for purchasing and using the Chameleon AntennaTM High Frequency (HF) Portable Loop Antenna 2.0
(CHA F-LOOP 2.0) or (CHA F-LOOP 2.0 PLUS). The unique craftsmanship of the CHA F-LOOP 2.0 distinguishes itself
from the competition. You are now part of the magnetic loop HF antenna craze that is sweeping the amateur radio
community. 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 earth or 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 more than a loop diameter
above ground making it very easy to site in a restricted space 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 towards the desired direction of radiation. Field trials of the CHA F-LOOP 2.0
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 only less
than three foot in diameter and covers 3.5 MHz to 29.7 MHz (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 resonance of 17 KHz on 40 meters, providing immunity
from interference outside the bandpass. The CHA F-LOOP 2.0 Antenna was designed with weight, portability,
versatility and cost in mind and is ideal for RV/camping, hotels, apartments, condominiums, homeowner’s
associations, deed restrictions and CCRs (Covenants, Conditions & Restrictions), Shortwave Listening (SWL) and
other places where it is not feasible to erect a multi-band wire or vertical antenna.
The CHA F-LOOP 2.0, see plate (1), is comprised of a
three foot diameter flexible radiator loop, a coupling
loop, a specially designed tuning unit, telescoping
mast, and coaxial feedline –all of which fit in the
supplied Flat Dark Earth (FDE) / Coyote Brown
military-style MOLLE bag. A high-efficiency 1”
collapsible aluminum tubing radiator loop, which
increases efficiency an average of 142% over the
standard flexible radiator loop, and a slightly larger
coupling loop is included with the CHA F-LOOP 2.0
PLUS and is also available as an option for the CHA F-
LOOP 2.0. The CHA F-LOOP 2.0 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.
Plate 1. Complete CHA F-LOOP 2.0 Antenna.
Please read this operator’s manual so that you may
maximize the utility you obtain from your CHA F-
LOOP 2.0 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

CHA F-LOOP 2.0 Page 4
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.
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 multihop 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.

CHA F-LOOP 2.0 Page 5
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 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 2.0, 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 2.0 is comprised of the following components, see plates (2) through (4):
Plate 2. CHA F-LOOP 2.0 Antenna.
a. Tuning Unit
The Tuning Unit adjusts the resonant frequency of the CHA F-LOOP 2.0 antenna.
b. Flexible Radiator Loop

CHA F-LOOP 2.0 Page 6
The Flexible Radiator Loop consists of a 34 inch diameter (102 inch length) insulated flexible metal loop with
UHF Plugs (PL-259) at both ends.
c. Coupling Loop
The Coupling Loop is a 6.5 inch diameter aluminum loop, which is attached to the end of the Telescoping Mast
(g) and used in the CHA F-LOOP 2.0 standard configuration. A larger, 7.0 inch diameter aluminum loop, is used
in conjunction with the High-Efficiency Radiator Loop (e) in the CHA F-LOOP 2.0 PLUS antenna configuration.
Plate 3. CHA F-LOOP 2.0 Tuning Unit.
d. Flexible Radiator Loop Extension
The Flexible Radiator Loop Extension consists of a 92 inch length of insulated flexible metal loop with UHF
Plugs at both ends. The Flexible Radiator Loop Extension enables the CHA F-LOOP 2.0 to operate the 80 meter
ham band.
e. High-Efficiency Radiator Loop
The High-Efficiency Radiator Loop consists of two sections of rigid aluminum tubing with end fittings and is
used with the CHA F-LOOP 2.0 PLUS antenna configuration.
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 Capacitor Box (a). These connections are not used in the CHA F-LOOP 2.0 PLUS antenna configuration.
g. Telescoping Mast
The Telescoping Mast attaches the Tuning Unit (a) to the Coupling Loop (c).
h. Tuning Knob

CHA F-LOOP 2.0 Page 7
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 relative position of the tuning capacitor, which rotates around 2 ¾ revolutions is shown on the
front panel Tuning Quadrant Indicator. 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, see plate (3), is located on the top of the Tuning Unit (a). It has two positions, marked “A”
and “B”. Table (2) shows the approximate frequency range of the CHA F-LOOP 2.0 in the three antenna
configurations.
Antenna
Configuration
Frequency Range (MHz)
in A Position
Frequency Range (MHz)
in B Position
Standard
4.9 –22.0
6.8 –29.7
Double
2.9 –12.0
4.1 - 14.3
High-efficiency
5.2 –24.0
7.5 –29.9
Table 2. CHA F-LOOP 2.0 Frequency Range.
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).
m. Coaxial Cable Assembly
The Coaxial Cable Assembly (not shown) is a 12 foot length of coaxial cable, with an RF isolator at the antenna
end, used to connect the CHA F-LOOP 2.0 Antenna to your radio.
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 2.0 on a flat surface, such as a table, or to mount the CHA F-LOOP 2.0 to a tripod or
other antenna mount with a 3/8” stud.
o. Portable Bag
The Portable Bag (not shown) is a high quality Flat Dark Earth (FDE) / Coyote Brown military-style MOLLE bag
used to store and transport the components of the CHA F-LOOP 2.0, making it highly portable.

CHA F-LOOP 2.0 Page 8
p. High-Efficiency Radiator Loop Connections
The connections for the CHA F-LOOP 2.0 PLUS High-Efficiency Radiator Loop (e), see plate (5) are brackets
located on the rear edge of the Tuning Unit (a). They are not used in the CHA F-LOOP 2.0 standard
configuration.
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 Radiator Loop Barrel Connector is used to join the Flexible Radiator Loop (b) to the Flexible Radiator Loop
Extension (d), which enables the CHA F-LOOP 2.0 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 P-Loop 2.0.
Standard Single Flexible Loop Assembly
The CHA F-LOOP 2.0 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 2.0 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 Flexible Loop Antenna, see plates (2) and (3).
1. Select a location to setup the CHA F-LOOP 2.0
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 2.0 components from
the Portable Bag (o).
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 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

CHA F-LOOP 2.0 Page 9
connector should be in front of the Telescoping
Mast and point down, as shown in Plate (2).
5. Extend the lower Telescoping Mast section 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).
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 2.0 on a flat surface, such
as a table top, or attach the Aluminum Base
Plate (n) to a tripod or other compatible
antenna mount.
11. Connect the Coaxial Cable Assembly (m) to the
Loop Connection (l).
12. Secure the Coaxial Cable Assembly along the
Telescoping Mast to ensure easy tuning and
consistent low SWR.
13. Perform an operational test (see procedure
below).
14. This completes installation of the CHA F-LOOP
2.0 standard configuration.
Double Flexible Loop Assembly
The CHA F-LOOP 2.0 Double Flexible Loop configuration allows you to use the CHA F-LOOP 2.0 on the 80 meter
ham band by extending the lower frequency of the CHA F-LOOP 2.0 down to 2.9 MHz. See Plate (4) and perform
the following steps.
Plate 4. Double Flexible Loop Antenna.
1. Perform assembly of the Standard Single
Flexible Loop configuration.
2. Disconnect one end of the Flexible Radiator
Loop (b) from the Flexible Radiator Loop
Connection (f).
3. Connect the free end of the Flexible
Radiator Loop to the Loop Extension Barrel
Connector (r).
4. Connect one end of the Flexible Radiator
Loop Extension (d) to the open Flexible
Radiator Loop Connection from step 2.
5. Form the Flexible Radiator Loop Extension
into a loop, like the Flexible Radiator Loop.
6. Attach the top of the Flexible Radiator Loop
Extension to the top of the Coupling Loop
(c) using the attached sticky strap.
7. Connect the free end of the Flexible
Radiator Loop Extension 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 procedure
below).
10. This completes installation of the Double
Flexible Loop configuration.

CHA F-LOOP 2.0 Page 10
High-Efficiency Loop Assembly
The CHA F-LOOP 2.0 PLUS includes a rigid aluminum high-efficiency radiator loop. This loop increases performance
of the CHA F-LOOP 2.0 Antenna, particularly on 60 through 20 meters. The CHA F-LOOP 2.0 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 2.0 PLUS 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 High-Efficiency Loop Antenna, see plate (5).
1. Select a location to setup the CHA F-LOOP 2.0
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 2.0 PLUS
components from the Portable Bag (o). Note
that the High-Efficiency Radiator Loop (e) will
not fit in the Portable Bag.
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 larger, 7.0 inch diameter, 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 back of the
Telescoping Mast and point down, as shown
in Plate (4).
5. Extend the lower Telescoping Mast section so
that the Telescoping Mast is 25 3/8 inches in
length.
6. Connect one section of the High-Efficiency
Radiator Loop (e) to the High-Efficiency
Radiator Loop Connection (p) on the left side
of the Tuning Unit (a) by inserting a hex bolt
through the curved side of the tubing section
end fitting. Then position the flat edge (if the
edge is rounded, rotate the tubing section
end-over-end) of the tubing section end
fitting against front of the bracket on the side
of the Tuning Unit and push the knurled bolt
through the hole in the bracket. Place a flat
washer and then a split washer on the knurled
bolt on the back of the bracket. Place a wing
nut on the end of hex bolt and tighten
securely (finger tight).
7. Attached the other section High-Efficiency
Radiator Loop to the right side of the Tuning
Unit as instructed in step (6). The Flexible
Radiator Loop Connections (f) are not used in
this configuration.
8. Attach the two sections of the High-efficiency
Radiator Loop together at the top by inserting
a knurled bolt through the round side of one
of the tubing sections. Place the hole in the
end fitting of the other section over the
knurled bolt. The flat edges of the tubing
section ends should be together. Put a flat
washer and then a split washer over the end
of the knurled bolt. Attach a wing nut on the

CHA F-LOOP 2.0 Page 11
end of the knurled bolt and tighten securely
(finger tight).
9. Secure Coupling Loop (c) top to the top
middle of the High-efficiency Radiator Loop
using the attached sticky straps. A 1/4 inch
gap between the top of the Coupling Loop
and High-Efficiency Radiator Loop will usually
provide good results, although some
adjustment may be necessary.
Plate 5. CHA F-LOOP 2.0 PLUS Antenna.
10. Connect one end of the Coaxial Cable
Assembly (m) to the Loop Connection (l).
11. Secure the Coaxial Cable Assembly along the
Telescoping Mast to ensure easy tuning and
consistent low SWR.
12. Place the CHA F-LOOP 2.0 on a table top or
attach the Aluminum Base Plate (n) to a tripod
or other antenna mount.
13. Perform an operational test (see procedure
below).
14. This completes installation of the CHA F-LOOP
2.0 PLUS antenna.
Power Compensator Installation
The optional Power Compensator will increase the power handling capability of the CHA F-LOOP 2.0 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 (6).

CHA F-LOOP 2.0 Page 12
Plate 6. Power Compensator.
CAUTION: When using the Power Compensator,
exceeding the specified power limits or prolonged
transmission with an SWR above 2.0:1 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.
Loop Operation
The CHA F-LOOP 2.0 is very easy to use. Perform the following steps whenever you change frequency.
1. The CHA F-LOOP 2.0 is bidirectional favoring
the sides, see plate (7). If possible, point
one side toward the target signal and rotate
the antenna for maximum signal strength.
Plate 7. CHA F-LOOP 2.0 Antenna
Directivity.
2. Set the Band Switch (i) to the desired
frequency range.
3. Adjust the Tuning Knob (h) for maximum
receive signal strength. Turn the Tuning
Knob counterclockwise to decrease the
resonant frequency, see Plate (8). 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. Do not attempt to force the
Tuning Knob past the stops.
Plate 8. CHA F-LOOP 2.0 Antenna Tuning.
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 1.5:1 or less is
satisfactory. Your hand may slightly
influence the resonance of the loop while

CHA F-LOOP 2.0 Page 13
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
15 Watts, see specifications
Disassembly
1. Disconnect Coaxial Cable Assembly (m) and neatly coil cable.
2. If used, disconnect Flexible Radiator Loop (b), carefully coil loop, and secure with attached sticky strap.
3. If used, disconnect Flexible Radiator Loop Extension (d), carefully coil loop, and secure with attached sticky
strap.
4. If used, detach High-Efficiency Radiator Loop (e) and secure pieces with attached sticky straps.
5. Fully collapse Telescoping Mast (g).
6. Remove Coupling Loop (c) from the Telescoping Mast.
7. Remove the Telescoping Mast from the Tuning Unit (a).
8. Clean and inspect antenna components and then place them into the Portable Bag (o).
9. 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 (f) are securely tightened.
3. Inspect Flexible Radiator Loop (b) for damage. Replace if damaged.
4. Ensure the Coaxial Cable Connection (m) is securely tightened to the Loop Connection (l).
5. Inspect Coaxial Cable assembly for cuts in insulation or exposed shielding. Replace if damaged.
6. Ensure Band Switch (i) is set for your frequency range.
7. Turn Tuning Knob (h) fully counterclockwise.
8. Adjust Tuning Knob over entire range listening for a marked increase in received signal strength and receiver
background noise.
9. If still not operational, replace Coaxial Cable assembly. Most problems with antenna systems are caused by
the coaxial cables and connectors.
10. If still not operational, contact us for technical support.
Preventive Maintenance
Like all of our products, the CHA P-LOOP 2.0 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: Single Flexible Loop: 4.9 –29.7 MHz (60 through 10 meter ham bands), Double Flexible Loop:
2.9 –14.3 Mhz (80 through 20 meter ham bands).
•Power: 25W intermittent duty cycle (SSB and SSB-based digital), 10W continuous duty cycle (CW, AM, FM,
RTTY).

CHA F-LOOP 2.0 Page 14
•Diameter: 34 Inches
•Ingress Protection: Not water resistant. Equivalent to IP30 (not tested).
•RF Connection: UHF Plug (PL-259)
•SWR: Operator tunable, typically not greater than 1.5:1 at resonance.
•Table (3) shows typical 2:1 bandwidth for the three antenna configurations.
BAND
2:1 SWR BANDWIDTH (KHZ)
STANDARD
DOUBLE
HIGH-EFFICIENCY
80
-
8
-
60
8
12
9
40
17
17
16
30
27
42
31
20
40
40
44
17
60
-
75
15
100
-
110
12
160
-
160
10
210
-
180
Table 3. 2:1 SWR Bandwidth.
•Weight: 4 lbs
•Personnel Requirements and Setup Time: one operator, around 2 minutes
•Do not use an antenna tuner or coupler with this antenna
Accessories
The following accessories are available for purchase from Chameleon AntennaTM. Please contact us at
[e-mail] for current prices and availability.
•High-Efficiency Radiator Loop. A high-efficiency 1” collapsible aluminum tubing radiator loop and larger
coupling loop, which increases efficiency an average of 142% over the standard flexible radiator loop, is
available as an option.
•Booster Flexible Loop. A 146 inch long (48 inch diameter) flexible loop, which increases CHA F-LOOP 2.0
efficiency from 40 to 15 meters.
•Power Compensator. Increases power handling of the CHA F-LOOP 2.0 from 25W to 60W for SSB
telephony.
•Coaxial Cable Assembly. 50 feet of RG-58 with integrated RFI Choke. Used to connect the CHA F-LOOP
2.0 to the radio set.
•RF Choke Assembly. The CHA RFI CHOKE will prevent, greatly reduces or totally eliminates the RFI carried
by the coax cable. This accessory is recommended if you are not using the Chameleon AntennaTM Coaxial
Cable Assembly.
•Remote Tuner –Remote Rotator. The CHA RT-RR enables remote tuning and rotation of the CHA -FLOOP
2.0 from up to 20 feet away from the operator to allow the antenna to be positioned in a more
advantageous location.
Recommended non-supplied accessories:
•SWR Power Meter.

CHA F-LOOP 2.0 Page 15
•Multi-Meter.
•Heavy-Duty Tripod.
Chameleon AntennaTM Products
The following products are available for purchase at Chameleon AntennaTM.
Go to http://chameleonantenna.com for ordering and more information.
CHA MPAS - The Modular Portable Antenna System
(MPAS) is a concept allowing the radio operator to
configure and deploy the antenna system in a variety
of configurations. Some of the possible deployment
configurations: Vertical, Horizontal, Sloper, Inverted
“V”, Inverted “L”, NVIS, Balcony, Vehicle (Stationary),
or Man-Pack.
CHA SKYLOOP - The CHA SKYLOOP is a 250' full wave
loop antenna cut for 80M. With the help of an
antenna tuner, the CHA SKYLOOP will cover all the
bands between 80M and 6M.
CHA WINDOM 40 –The CHA WINDOM 40 Antenna is
designed for 40, 20, and 10 meters. Amateur Bands
from 60 through 10 meters can be operated using an
antenna tuner. Built with the portable operator in
mind, it is very light weight, easy to set up, and
comes with a military-style pouch.
CHA EMCOMM II - The CHA EMCOMM II Antenna
has been specially designed for backup emergency
HF system or permanent installation. The integral
broadband impedance matching network allows
broadband antenna tuning.
CHA HYBRID Vehicular Base - The CHA HYBRID
Vehicular Base is designed to enhance the
capabilities of the common HF radio application by
allowing faster tuning operation across the HF bands
including MARS/CAP frequencies. This antenna base
has an integral broadband impedance matching
network allowing broadband antenna tuning. The
CHA HYBRID can be used mobile with the CHA V1L
and V2L mobile antennas or stationary with the
provided 30' wire.
CHA V1 Mobile Antenna - The CHA V1 antenna is
our first and classic broadband HF mobile antenna
that we designed. It has been updated from
fiberglass to 7075 alloy and stainless steel.
CHA V1L Mobile Antenna - The CHA V1L antenna is a
rugged multiband HF mobile antenna that can be
erected in a minimum of time and space.
CHA V2L Mobile Antenna - The CHA V2L is a rugged
multiband HF antenna designed for smaller vehicles.
CHA VHF/UHF Magnetic Mount Mobile Antenna -
The CHA VHF/UHF is a simple but great dual band
antenna for 2M and 70CM.
CHA Hybrid Mini –Portable HF Antenna Base - The
CHA HYBRID-MINI Base is the portable version of the
regular HYBRID. The HYBRID-MINI is smaller and
about 50% lighter than the regular HYBRID. An
external antenna tuner is required to provide a low
VSWR. The connector provided with the antenna is a
SO-239 sealed. The entire unit is also waterproof.
The HYBRID-MINI will serve as impedance
transformer matching network and will greatly
reduce the VSWR at the load for the following
antennas: V1, V1L, V2L and MIL.
CHA Hybrid Micro - Portable HF Antenna Base -
The CHA HYBRID-MICRO is a lightweight highly
portable broadband antenna system designed to
offer maximum portability and performance. The
antenna weights about 1 lb. The antenna will
operate at all frequencies in the 1.8-54 MHz band
without any adjustment with most modern external
antenna tuners. No masts or guying are required.
The antenna will work successfully supported by
trees, masts, the tops of vehicles or any convenient

CHA F-LOOP 2.0 Page 16
object or structure. The antenna works most
effectively when elevated at a reasonable height.
CHA MIL Whip - The CHA MIL whip is a broadband
(28 to 54 MHz) monopole antenna designed for
portable or man-pack radios requiring compact but
rugged antenna systems. Its design has been
borrowed from similar antennas utilized by many
armies all over the world. The CHA MIL is very hardy,
sturdy and portable (being collapsible). Un-mounted
the entire antenna length is less than 29”. The 5
aluminum sections are hold together by a piece of
1/8th inch US GI MIL SPEC shock cord. The CHA MIL
Whip and a CHA HYBRID-MINI Base perfectly
complements the capability of the CHA F-LOOP 2.0.
CHA MIL EXT Whip Extension - The CHA MIL EXT
whip has been designed to offer maximum
portability and performance for those already using
the portable CHA MIL whip for man-pack antenna
system. This collapsible antenna extension needs to
be used with the CHA MIL to create a 17’4” long
portable antenna. When combined with any HYBRID
series antenna bases the CHA MIL EXT will operate at
all frequencies in the 1.8-54 MHz band without any
adjustment with most modern external antenna
tuners.
CHA TD Tactical Dipole LITE - The CHA TD LITE
(Tactical Dipole LITE) is a HF broadband antenna
specially designed for portable HF communication
where rapid deployment and simplicity of operation
is essential but compactness is primordial. The
antenna will operate at all frequencies in the 1.8-54
MHz band without any adjustment with most
modern external antenna tuners. No masts or guying
are required.
CHA TD Tactical Dipole - The CHA TD (Tactical
Dipole) Antenna has been designed as an add-on for
the CHA F-LOOP 2.0. The CHA TD is a HF broadband
antenna specially designed for portable HF
communication where rapid deployment and
simplicity of operation is essential. The antenna will
operate at all frequencies in the 1.8-30 MHz band
without any adjustment with most modern internal
antenna tuners. It is ideal for use in conjunction with
modern, digitally configured, HF communication
transceivers where features such as ALE and
frequency hopping require true broadband
capability. No masts or guying are required. The
CHA TD can also be used without antenna tuner, as
the SWR will stay under 2.5:1 between 10M and
80M and under 2.75:1 on 160M.
FT-817 Brackets 2.0. The CHA FT-817 BRACKETS 2.0
CHA are a military-style pair of precision fabricated
aluminum brackets and high quality carrying strap
for the popular Yaesu FT-817 series portable QRP
transceiver. The brackets have built-in folding legs to
tilt the front panel of the FT-817 toward the
operator during use. There is also a custom-made
microphone holder.
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.