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 TOTAL)
Operator’s Manual
Nevada - 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
Flexible Booster Loop Assembly (CHA F-LOOP 2.0 TOTAL).......................................................................9
Power Compensator Installation ............................................................................................................10
Loop Operation.......................................................................................................................................11
Disassembly.............................................................................................................................................12
Troubleshooting......................................................................................................................................12
Preventive Maintenance.........................................................................................................................12
Specifications ..........................................................................................................................................12
Accessories..............................................................................................................................................13
Chameleon AntennaTM Products............................................................................................................14
References ..............................................................................................................................................14
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 TOTAL). 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 military-style MOLLE bag. The CHA F-LOOP
2.0 TOTAL includes a four-foot diameter booster
flexible loop and larger coupling loop that improve
efficiency in the 40 - 15 meter bands.
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. Please read this
operator’s manual so that you may maximize the
utility you obtain from your CHA F-LOOP 2.0
antenna.
Plate 1. Complete 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 of shorted coaxial cable with UHF
Plugs (PL-259) at both ends.
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 2.0 standard configuration. A larger, 8 inch diameter rigid
aluminum loop, is used in conjunction with the Booster Flexible Loop (e) in the CHA F-LOOP 2.0 TOTAL
antenna configuration.
Plate 3. CHA F-LOOP 2.0 Tuning Unit.
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 2.0 to operate the 80 meter ham
band.
e. Flexible Booster Loop
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 2.0 TOTAL efficiency from 60 to 15 meters.
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).
g. Telescoping Mast
The Telescoping Mast attaches the Tuning Unit (a) to the Coupling Loop (c).

CHA F-LOOP 2.0 Page 7
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 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 transmit 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
4.7 –22.4
6.7 –29.7
Double
2.8 –10.2
5.0 –11.9
Booster
4.0 –17.9
5.4 - 23.1
*Range may vary
Table 2. CHA F-LOOP 2.0 and CHA F-LOOP TOTAL Frequency Ranges.
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 Feedline
The Coaxial Cable Feedline (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 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 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. Not used
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 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 Plate (2).
5. Extend the Telescoping Mast sections so that
the Telescoping Mast is 24 inches in length.

CHA F-LOOP 2.0 Page 9
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 Feedline (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 procedure
below).
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 2.8 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) “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.
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 procedure
below).
Flexible Booster Loop Assembly (CHA F-LOOP 2.0 TOTAL)
The CHA F-LOOP 2.0 TOTAL uses the Flexible Booster Loop and a larger Coupling Loop to increase efficiency in the
60 to 15 meter ham bands. The CHA F-LOOP 2.0 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

CHA F-LOOP 2.0 Page 10
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 Flexible Booster Loop Antenna, see plates (2) and (3).
1. Select a location to setup the CHA F-LOOP 2.0
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 2.0 TOTAL 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 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 Plate (2).
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 middle of 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.
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 Feedline (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 procedure
below).
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 11
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 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. Although the mechanism
includes a clutch to prevent damage, you
should not force the knob past the stops.
Plate 8. CHA F-LOOP 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 2.0:1 or less is
satisfactory. Your hand may slightly
influence the resonance of the loop while

CHA F-LOOP 2.0 Page 12
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 Feedline (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 the Flexible Booster 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 the Coaxial Cable Feedline 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 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.
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: Standard Flexible Loop: approximately 4.7 –29.7 MHz (60 through 10 meter ham bands),
Double Flexible Loop: approximately 2.8 –11.9 Mhz (80 through 30 meter ham bands), Flexible Booster
Loop: approximately 4.0 - 23.1 MHz (60 through 15 meter ham bands).

CHA F-LOOP 2.0 Page 13
•Power: 25W intermittent duty cycle (SSB and SSB-based digital), 10W continuous duty cycle (CW, AM, FM,
RTTY).
•Diameter: 34 inches (Standard Loop) or 48 inches (Booster Loop)
•Ingress Protection: Not water resistant. Equivalent to IP30 (not tested).
•RF Connection: UHF Plug (PL-259)
•SWR: Operator tunable, typically not greater than 2.0:1 at resonance.
•Table (3) shows typical 2:1 bandwidth for the three antenna configurations.
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
•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.
•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 2.0 efficiency from 60 to 15 meters. (This kit is included with
the CHA F-LOOP 2.0 TOTAL)
•Power Compensator. Increases power handling of the CHA F-LOOP 2.0 from 25W to 60W for SSB
telephony.
Recommended non-supplied accessories:
•SWR Power Meter.
•Multi-Meter.
•Heavy-Duty Tripod.

CHA F-LOOP 2.0 Page 14
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.