Chameleon Antenna CHA F-LOOP Скачать руководство пользователя страница 5 | Manualshive

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Chameleon Antenna CHA F-LOOP Скачать руководство пользователя страница 5

CHA F-LOOP

Page 5

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, 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 is comprised of the following components, see plates (2) and (4):

Plate 2. Standard CHA F-LOOP Antenna.

a.

Tuning Unit

The Tuning Unit adjusts the resonant frequency of the CHA F-LOOP antenna.

b.

Standard Flexible / Optional High-Efficiency Radiator Loop

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Содержание CHA F-LOOP

Страница 1: ...HF Faraday Loop Antenna CHA F LOOP Operator s Manual California USA WWW CHAMELEONANTENNA COM VERSATILE DEPENDABLE STEALTH BUILT TO LAST ...

Страница 2: ...tect 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 hi...

Страница 3: ...MHz to 29 7 MHz 60 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 around 15 KHz on 60 meters providing immunity from interference outside the bandpass The CHA F LOOP Antenna was designed with weight portability versatil...

Страница 4: ...nd 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 a...

Страница 5: ...ffective antenna for both local and long distance DX communication While not specifically designed for NVIS during field testing of the CHA F LOOP 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 is comprised of the following components see plates 2 and 4 Plate 2 Standard CHA F LOOP Antenna a Tuning Unit The Tuning Unit a...

Страница 6: ...on g Coaxial Cable Connection The Coaxial Cable Connection is a UHF socket located on the rear of the Tuning Unit a and is used to connect the Coaxial Cable k to the radio It is not used in the High Efficiency CHA F LOOP Antenna configuration 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 ...

Страница 7: ...iator Loop b p High Efficiency Radiator Loop Connections The connections for the optional High Efficiency Radiator Loop b see plate 5 are brackets located on the rear edge of the Tuning Unit a They are not used in the Standard CHA F LOOP configuration q High Efficiency Radiator Loop Joints The High Efficiency Radiator Loop Joints see plate 5 are used to connect together the three sections of the O...

Страница 8: ...nna 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 Inter...

Страница 9: ... 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 e...

Страница 10: ...n e on the top of the Tuning Unit 8 Place the CHA F LOOP on a table top or attach the Aluminum Base Plate m to a tripod or other antenna mount 9 Connect the Coaxial Cable Assembly l to the Coaxial Cable Connection g on the back of the Tuning Capacitor Box 10 Perform an operational test see procedure below 11 This completes installation of the Optional CHA F LOOP High Efficiency loop configuration ...

Страница 11: ...on f 2 Connect the free end of the Flexible Radiator Loop to the Loop Extension Barrel Connector t 3 Connect one end of the Flexible Radiator Loop Extension s to the open Flexible Radiator Loop Connection from step 1 4 Form the Flexible Radiator Loop Extension into a loop like the Flexible Radiator Loop 5 Attach the top of the Flexible Radiator Loop Extension to the Faraday Loop c using a Faraday ...

Страница 12: ...nna Directivity 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 turning the Tuning Knob This is completely normal and you may have to touch up the adjustment slightly The...

Страница 13: ...r coupler with this antenna Accessories The following accessories are available for purchase from Chameleon Antenna TM Please contact us at support chameleonantenna com for current prices and availability High Efficiency Radiator Loop A high efficiency 1 collapsible aluminum tubing radiator loop which increases efficiency an average of 142 over the standard flexible radiator loop is available as a...

Страница 14: ...n 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 unit can be differentiated by the color of...

Страница 15: ...he 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 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...

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