Related Manuals for Chameleon Antenna CHA TD
Summary of Contents for Chameleon Antenna CHA TD
- Page 1 Tactical Dipole (CHA TD) Operator’s Manual California - USA WWW.CHAMELEONANTENNA.COM VERSATILE – DEPENDABLE – STEALTH – BUILT TO LAST...
-
Page 2: Table Of Contents
Products ......................22 References .............................. 24 Be aware of overhead power lines when you are deploying the CHA TD. You could be electrocuted if the antenna gets near or contacts overhead power lines. All information on this product and the product itself is the property of and is proprietary to Chameleon Antenna . -
Page 3: Introduction
Antennas built by Chameleon Antenna 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 TD. HF Propagation HF radio provides relatively inexpensive and reliable local, regional, national, and international voice and data communication capability. -
Page 4: Parts Of The Antenna
The CHA TD is comprised of the following components: a. Matching Transformer, EMCOMM II The EMCOMM II Matching Transformer, see plate (1), provides impedance matching for the CHA TD. b. Antenna Wire The Antenna Wires, see plate (2), are two 60 foot lengths of black insulated wire, wrapped around Line Winders (f). - Page 5 (2) and (3). They enable rapid deployment and recovery of the CHA TD. Plate 2. Antenna Wire. Termination Resistor, CHA R-300 The Termination Resistors, see plate (4), are non-inductive 300 Ohm resistors. They enable the CHA TD to be broad-banded without use of a tuner or coupler. CHA TD...
- Page 6 . At least one additional assembly is highly recommended for deployment of some antenna configurations. Stakes The four stainless steel stakes (not pictured) are used to anchor various ends of the CHA TD to the ground, depending upon the antenna configuration. Coaxial Cable The Coaxial Cable assembly, see plate (5), is a 50 foot length of RG-58 coaxial cable with built-in RF current isolation, terminated at each end with a UHF Plug, PL-259 (o).
- Page 7 The Bottom Transformer Connection is located on the bottom of the Matching Transformer (a), see plate (1). n. Transformer Eyebolt The Transformer Eyebolt is located on the top of the Matching Transformer (a), see plate (1). Plate 5. Coaxial Cable. CHA TD Page 7...
-
Page 8: Antenna Configurations
Antenna Configurations Using the supplied components, the CHA TD can be deployed into a number of configurations. Six configurations are described in this manual, each with unique performance characteristics. Table (2) shows the antenna configurations described in this manual. -
Page 9: Sloping "V
(Note: * see configuration for coverage) Sloping “V” The CHA TD Sloping “V” configuration, see figure (1), is a broadband medium to long range HF antenna. This configuration exhibits directionality towards the opening of the “V” at medium to higher frequencies, while on lower frequencies it is bidirectional to the sides of the “V”. - Page 10 Paracord (around 4 feet) to the Antenna Wires to the Resistor Connection (p). Carabiners at the unconnected end of both Tighten the wing nuts finger tight. Antenna Wires. Attach the Counterpoise Wires. 13. Extend one Antenna Wire to its full length. CHA TD Page 10...
-
Page 11: Horizontal Dipole
Tighten the wing nuts finger tight. Horizontal Dipole The CHA TD Horizontal Dipole configuration, see figure (4), is a broadband short to long range HF antenna. The Horizontal Dipole is the standard for wire HF antennas and will provide good sky wave (including NVIS) propagation. -
Page 12: Sloping Wire
21. Perform operational test. Sloping Wire The CHA TD Sloping Wire configuration, see figure (5), is a broadband medium range HF antenna. It should provide acceptable ground wave and sky wave propagation. This configuration is predominately omnidirectional, slightly favoring the direction of the low end of the antenna on lower frequencies, broadside around 10 MHz, and the high end of the antenna on higher frequencies. - Page 13 21. Extend the Counterpoise Wire that is attached Wire to the Resistor Connection (p) of the to the Matching Transformer along the ground Termination Resistor. Tighten the wing nut in any convenient direction. finger tight. 22. Perform operational test. CHA TD Page 13...
-
Page 14: Inverted "L
Inverted “L” The CHA TD Inverted “L” configuration, see figure (6), is a broadband medium range HF antenna. This configuration is somewhat unidirectional, favoring the Terminating Resistor end of the antenna as the frequency increases. It is also provides effective ground waves communication during the day time on frequencies between 1.8 –... -
Page 15: Horizontal Nvis
Raise the Antenna. Horizontal NVIS The CHA TD Horizontal NVIS configuration, see figure (7), is a special configuration designed to provide good NVIS propagation on lower frequencies. It is predominately omnidirectional and also provides medium range sky wave propagation on frequencies above 10 MHz. It is suitable for hasty deployment and requires two supports that will enable the antenna to be raised to a height of 10 –... -
Page 16: Half Rhombic
Paracord over the other support. Half Rhombic The CHA TD Vertical Half Rhombic configuration, see figure (8), is a low noise broadband medium range HF and line-of-sight VHF Low Band (30.0 - 54.0 MHz) antenna. This configuration is unidirectional in the direction of the Matching Transformer below 12 MHz and the Termination Resistor above 25 MHz. - Page 17 Antenna tight. Wire. This Antenna Wire is the counterpoise for 13. Attach a short length (4 feet) of Paracord to the this configuration. Carabiner from step (11). 22. Perform operational test. CHA TD Page 17...
-
Page 18: Recovery Procedure
12. Remove dirt from antenna components and inspect them for signs of wear. Packing Procedure Note: If you have just received your CHA TD, you may want to go through this procedure to pack your new antenna in its backpack. -
Page 19: Specifications
Personnel Requirements and Setup Time: one trained operator, less than 15 minutes Far Field plots for the various CHA TD are shown in figures (9) through (13) Figure 9. Sloping “V” Far Field Plot, 7 MHz (left), 14 MJHz (right). - Page 20 Figure 10. Horizontal Dipole Far Field Plot, 3.7 MHz (left), 14 MHz (right). Figure 11. Sloping Wire Far Field Plot, 7 MHz (left), 14 MHz (right). CHA TD Page 20...
- Page 21 Figure 12. Inverted “L” Field Plot, 7 MHz (left), 14 MHz (right). Figure 13. Half Rhombic Field Plot, 7 MHz (left), 50 MHz (right). CHA TD Page 21...
-
Page 22: Accessories
Accessories The following accessories are available for purchase from Chameleon Antenna . Please contact us at support@chameleonantenna.com for current prices and availability. 50’ Paracord and Line Winder Assembly (h). This is highly recommended to enable installation of the CHA TD in certain configurations or situations where available supports are higher or further apart. - Page 23 HYBRID-MICRO is a great quick deployment backup capabilities of the common HF radio application by for the CHA TD and will fit in the same backpack. allowing faster tuning operation across the HF bands The CHA HYBRID-MICRO and a CHA MIL Whip including MARS/CAP frequencies.
-
Page 24: References
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. CHA TD Page 24...