Kalkulator Antena Ht J Pole

March 24 2020 at 10 03 pm thanks ronald good luck with your project.

Kalkulator antena ht j pole. 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. There are many rumours on the internet claiming that the slim jim has better performance than the j pole. Slim jim vs j pole. 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.

Elemen panjang long section 155 cm elemen pendek short section 53 cm spasi antar elemen spacing 4 cm feed point pada elemen panjang 6 5cm feed point pada elemen pendek 2 cm. Berdasarkan beberapa referensi dari internet saya mencoba untuk membuat j pole antenna yang cocok untuk band di yb. Below is a quarter wave ground plane antenna i made for 23cm 1296mhz which is made from off cuts of household mains copper wire and a scrap bnc socket from the junk box. Single copper tube bent in this shape use 6 nos elbow s at the bents for neat construction.

Click to enlarge. Hasil dari percobaan saya adalah sbb. Because this is a half wave antenna it. Here it is set up in the garden for testing on 145 500mhz.

And the impedance and reactance are perfect. Thanks for posting it. Cq india vhf collinear super j antenna. Ruggedly constructed one piece design this j pole antenna will last practically forever.

Simulation and common sense suggests that they are practically identical. The j pole makes a great base station and emcomm emergency communications amateur radio and scanner antenna. March 24 2020 at 9 59 pm i have used your plan to make my jpole. John huggins kx40 covers this question on this page.

Works well with handheld ht radios base stations and repeaters. 2 thoughts on j pole antenna length calculator ronald strawsburg says. Ham radio india vhf super j pole collinear antenna calculator jpole j pole. 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.

Copper has an extremely. For 2 meters the coil is 4 turns of coax at 5 inches in diameter. 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. Five turns 4 inch dia rg58u coax at the bottom of feed point.

It is likely that any real world tests that show the slim jim to have better low angle.