Antena J Pole Collinear

Beberapa situs web menyarankan super j memiliki gain 3 db penuh atas dataran j pole yang merupakan klaim sok jelas bagi siapa pun dengan salinan kitab antena arrl dan referensi lainnya 1.

Antena j pole collinear. The 2 meter collinear j pole antenna project by sean m3fvb. Slim jim vs j pole. Simulation and common sense suggests that they are practically identical. Memang super j tidak akan pernah mendekati keuntungan gain dari antena dua elemen yang benar dipisahkan collinear tapi kita bisa lebih mendekati tujuan ini.

The collinear j antenna improves the super j by separating the two radiating half wave sections to optimize gain using a phasing coil. Enter the required frequency in mhz the velocity factor of the coax if known and antenna designer will calculate the dimensions of the elements as shown below. The resulting gain is closer to the optimum 3 db over a conventional j pole or halfwave antenna. Below are some examples.

The buck0 5 8ths wave collinear j pole does perform. Here is a closeup of the lobes on the right close up of eznec j pole lobes. The collinear j pole often known as the super j does improve the behavior over a regular j pole. Note the collinear 5 8 wave j pole does indeed perform about as well as a regular j pole in these circumstances at this particular azimuth.

Calculate the required dimensions for a coaxial collinear antenna construction for any given frequency. John huggins kx40 covers this question on this page. Conclusion the j pole antenna is a simple and reliable antenna for consideration for home construction. This page documents a build of a 2 element 1 2 wave collinear j pole performed by harry kc9eot and myself kb8ojh.

A quick search on the internet will turn up construction details all variations of the j pole. They may be constructed with inexpensive materials. It is likely that any real world tests that show the slim jim to have better low angle. High gain vhf uhf collinear j pole with phasing short spaced coils 146 mhz by wb3ayw and kk1cw.

The super j and the collinear j pole proved gain over a simpler j pole. The half wave collinear j pole beats out both antennas by about 2 db. The approximate gain in the h plane of the collinear j antenna is from 4 6 to 5 2 dbi 2 4. As many attest there is an advantage when vertically combining 1 2 radiating sections to have a bit of separation between the half wave end points.

There are many rumours on the internet claiming that the slim jim has better performance than the j pole.