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Chameleon Antenna CHA TD, Руководство оператора

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CHA TD 

Page 14 

 

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  –  4.0  MHz  without  using  sky  wave  propagation.    The  Inverted  “L”  requires  two  supports  and  should  be 
mounted at a height of 25 feet for best performance, but will provide good performance at a height of 10 to 20 
feet and is usable when mounted as low as 3 feet.  

 

Figure 6. Inverted L Configuration. 

 

Site Selection and Preparation. 

1.

 

Select a  site to deploy the CHA TD Inverted “L” 
Wire  configuration,  see  figure  (6).  The  site 
should  have  two  trees  or  other  support  that 
would  enable  the  Termination  Resistor  and  the 
corner of the “L” in the Antenna Wire to be at a 
height  of  around  25  feet.    If  a  tall  supports  are 
unavailable,  any  convenient  object,  such  as  a 
fence post or the top of a vehicle, may be used 
as  a  field  expedient  support  with  reduced 
performance. 

2.

 

Remove the Matching Transformer (a), Paracord 
(h), one Antenna Wire (b), Coaxial Cable (j), two 
Stakes (i), both Counterpoise Wires (c), and one 
Termination Resistor (g) from the Backpack (s). 

3.

 

 If not already attached, connect a Carabiner to 
each  end  of  the  Antenna  Wire  and  to  the  Wire 
Connector end of both Counterpoise Wires.  

Connect  the  Matching  Transformer.    Refer  to  figure 
(2) for steps (4) 

–

 (9).  

4.

 

Connect  the  Carabiner  from  the  Counterpoise 
Wire to the Transformer Eyebolt (n). 

5.

 

Connect  the  Wire  Connector  (r)  from  the 
Counterpoise  Wire  to  the  Bottom  Transformer 
Connection  (m).    Tighten  the  wing  nut  finger 
tight. 

6.

 

Connect  the  Carabiner  from  one  end  of  the 
Antenna Wire to the Carabiner from step (4). 

7.

 

Connect  the  Wire  Connector  from  the  Antenna 
Wire  to  the  Top  Transformer  Connection  (l).  
Tighten the wing nut finger tight. 

8.

 

Connect  the  UHF  Plug  (o)  from  one  end  of  the 
Coaxial  Cable  to  the  UHF  Socket  (k)  on  the 
Matching Transformer. 

9.

 

Using  a  Bowline  of  similar  knot,  tie  one  end  of 
short  length  (around  four  feet)  of  Paracord  to 
the Carabiner connected in step (4). 

10.

 

Drive  a  Stake  in  the  ground  near  the  support 
closest to the location of the radio set. 

Содержание CHA TD

Страница 1: ...Tactical Dipole CHA TD Operator s Manual California USA WWW CHAMELEONANTENNA COM VERSATILE DEPENDABLE STEALTH BUILT TO LAST ...

Страница 2: ...ng Procedure 18 Troubleshooting 18 Specifications 19 Accessories 22 Chameleon AntennaTM 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 TM Specifications are...

Страница 3: ...xplanation 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 and which of the CHA TD s configurations will support their communication requirements HF radio waves propagate from the transmitting antenna to the receiving antenna using two methods ground waves and sky wave...

Страница 4: ...ons 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 c...

Страница 5: ...tore the Antenna Wires b Counterpoise Wires c and Paracord h see plates 2 and 3 They enable rapid deployment and recovery of the CHA TD Plate 2 Antenna Wire g 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 ...

Страница 6: ... are used to anchor various ends of the CHA TD to the ground depending upon the antenna configuration j 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 The cable length may be extended using a Double UHF Socket SO 239 Barrel and another Coaxial Cable assembly which is ...

Страница 7: ...ransformer Connection 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 ...

Страница 8: ... in this manual each with unique performance characteristics Table 2 shows the antenna configurations described in this manual The table can assist the operator to quickly select the most appropriate antenna configuration to meet their operational requirements Configuration Ground Short Medium Long Directionality Deployment Sloping V Unidirectional Deliberate Horizontal Dipole Bidirectional Delibe...

Страница 9: ...ngle of 90 will provide good overall performance but angles from 180 to 60 can be used to fit the antenna to the site or to improve performance Larger opening angles increase performance on lower frequencies and smaller angles on higher frequencies At 180 the antenna becomes an Inverted V antenna The antenna may also be mounted horizontally using three 10 foot tall supports Figure 1 Sloping V Ante...

Страница 10: ...t the unconnected end of both Antenna Wires 13 Extend one Antenna Wire to its full length 14 Drive a Stake in the ground around two feet beyond the end of the Antenna Wire 15 Using two Half Hitches or similar knot tie the short length of Paracord from the Antenna Wire to the Stake such that the Antenna Wire is not quite taut 16 Extend the other Antenna Wire to its full length along the approximate...

Страница 11: ...al broadside to the antenna If the center of the antenna is supported and the ends are sloped down to the ground the antenna becomes an Inverted V see Sloping V configuration If the Termination Resistors are not installed the antenna becomes an Un terminated Broadband Horizontal Dipole If the Termination Resistors are not installed and a Counterpoise Wire is substituted for one of the Antenna Wire...

Страница 12: ...iners to the Resistor Eyebolts of the Termination Resistors 19 Connect the Wire Connectors to the Resistor Connections of the Termination Resistors Tighten the wing nuts finger tight Raise the antenna 20 Raise the antenna to the desired height and secure the free ends of the Paracord to the supports with a Round Turn and two Half Hitches or similar knot 21 Perform operational test Sloping Wire The...

Страница 13: ...nect the Wire Connector from the Antenna Wire to the Resistor Connection p of the Termination Resistor Tighten the wing nut finger tight 13 Connect the Carabiner from the Counterpoise Wire to the other end of the Termination Resistor 14 Connect the Wire Connector from the Counterpoise Wire to the Resistor Connection of the Termination Resistor Tighten the wing nut finger tight 15 Using a Bowline o...

Страница 14: ...e top of a vehicle may be used as a field expedient support with reduced performance 2 Remove the Matching Transformer a Paracord h one Antenna Wire b Coaxial Cable j two Stakes i both Counterpoise Wires c and one Termination Resistor g from the Backpack s 3 If not already attached connect a Carabiner to each end of the Antenna Wire and to the Wire Connector end of both Counterpoise Wires Connect ...

Страница 15: ...izontal 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 12 fe...

Страница 16: ...ombic 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 This configuration will produce line of sight and sky wave propagation with best performance above 25 MHz It requires one support at lea...

Страница 17: ...tight 13 Attach a short length 4 feet of Paracord to the Carabiner from step 11 Raise the Antenna 14 Using a throw weight or some other method loop the Paracord over the support 15 Using a Fisherman s or similar knot tie the Paracord to the center of one of the Antenna Wires 16 Raise the apex at the center of the Antenna Wire to a height of 18 feet and secure the Paracord to the support using a Ro...

Страница 18: ...his suggested packing procedure will make deployment easier and help to ensure you don t lose any CHA TD components during recovery To pack the CHA TD in the Backpack s perform the following steps 1 Place the Matching Transformer a into the lower front pouch 2 Place the Paracord h into the lower front pouch and zip up the pouch 3 If not already connected attach a Carabiner e to the Isolation Loops...

Страница 19: ...former a Specifications Frequency 1 8 MHz through 30 0 MHz continuous including all Amateur Radio Service bands 160m to 10m 30 0 MHz through 54 0 MHz continuous including the 6m Amateur Radio Service band also available when the CHA TD is installed in the Half Rhombic configuration Power 100 W continuous duty cycle CW AM FM RTTY 300 W intermittent duty cycle SSB and SSB based digital modes RF Conn...

Страница 20: ...CHA TD 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 ...

Страница 21: ...CHA TD 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 ...

Страница 22: ...ontinuously The unassembled antenna comes into a high quality MOLE tactical bag for easy carry and storage CHA P LOOP The CHA P LOOP is designed to be rugged portable and versatile It is ideal when you require highly portable communication capability such as when hiking camping staying in a hotel preparing for emergencies or disasters and other activities and places that preclude erecting a full s...

Страница 23: ...YBRID MINI is also smaller and about 50 lighter than the regular HYBRID The CHA HYBRID MINI Base and a CHA MIL Whip perfectly complements the capability of the CHA TD CHA HYBRID MICRO Antenna The CHA HYBRID MICRO is a lightweight highly portable broadband HF antenna system designed to offer maximum portability and performance The antenna weights about 1 lb The antenna will operate at all frequenci...

Страница 24: ...ons 91 st 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 ...

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