Antena J Pole Calculo

For 2 meters the coil is 4 turns of coax at 5 inches in diameter.

Antena j pole calculo. If you predominately used the upper side of the 2 meter band you might put 147 00 mhz. The calculator can be used for designing a super j pole antenna for just about any frequency or it can be used for the standard j pole antenna by leaving out the top section. March 24 2020 at 9 59 pm i have used your plan to make my jpole. Frequency mhz wavelength mm distance a mm distance a inch distance b mm distance b inch distance c mm distance c inch distance d mm distance d inch rod diameter mm rod diameter inch notes if the antenna is to be placed outside do not use brass.

Enter your desired frequency and get the calculated lengths from below. On most of the j pole designs out there a choke should be used as close to the feedpoint of the antenna as possible to help prevent rf on the feedline and creating difficulty with swr readings. Frecuencia de trabajo mhz a. Thanks for posting it.

The super j pole yields about 6db gain over a 1 4 wave ground plane by adding one 1 2 wave section to the top of the regular j pole with a matching section between the. Calculo antena j pole 4db de ganancia aprox nota. Matching to the feed line is achieved by sliding the connection of the feedline back and forth along the stub until an impedance match is obtained. 2 thoughts on j pole antenna length calculator ronald strawsburg says.

Dentro de d es la distancia de borde a borde de medición no de centro a centro. Being a half wave antenna it provides a small gain over a. Foot inch metros cms b. The j pole antenna is an end fed omnidirectional half wave antenna that is matched to the feedline by a quarter wave transmission line stub.

The slim jim designed by the late fred judd g2bcx can be a great portable roll up antenna if made out of 300ω or 450ω ladder line twin feeder. The j pole antenna is an end fed omnidirectional half wave antenna that is matched to the feedline by a quarter wave parallel transmission line stub of lecher system form. For example if you wanted a general j pole for 2 meters you might enter the center of the 2 meter band which would be 146 00 mhz. This calculator can be used to design a slim jim or a j pole antenna.

J pole antenna calculator. Matching to the feed line is achieved by sliding the connection of the feedline back and forth along the stub until a vswr as close as possible to 1 1 is obtained.