Gain Antena J Pole

If someone makes an claim that an antenna has 6 db of gain over a j pole antenna then they really don t understand how gain works.

Gain antena j pole. The slim is an end fed folded dipole antenna that has a gain of 6 dbi and a nice low rf take off angle. Jan 15 2019 explore jafitek s board j pole antenna on pinterest. For hobbyists in particular with portable antennas the j pole is considerably easier to build and it works ok. There are times when you may need more gain than the standard j pole antenna.

The dual band open stub j pole antenna built out of heavy duty 3 16 angle aluminum uhf so 239 connector with 3 8 aluminum elements and all stainless steel hardware. They will give you a good ballpark figure for gain. If you are unsure about an antenna s gain characteristics or capabilities ask the manufacturer to describe the style or style of antenna it is. This may be an emerging challenge to scientific credibility.

This elevates the shield even higher in voltage. So to get an idea of the gain of an antenna consult the antenna handbook from the arrl or other similar references. Things affecting j pole pattern and gain. Equating 0 2 db to substantially more gain is a stretch and a bit of an outcome bias in my opinion.

With twice the gain of a standard j pole antenna the 2 meter slim jim antenna is a j pole on steroids. 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. This calculator can be used to design a slim jim or a j pole antenna. Heavy duty super sturdy 5 8 coupling nut for added resilience.

The slim jim antenna provides substantially more gain than the j pole antenna. Any well constructed j pole will give similar gain. J pole antenna gain drawings are a common bad example. Slimjim and antenna gainflation.

4 emphasis added. 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. June 21 2018 may 26 2016. This makes the 2 meter slim jim antenna a great solution for repeater sites data and packet stations aprs.

Understanding why slimjim antenna aficionados hype the gain in their marketing and discussions. A half wave antenna is a half wave antenna. Ground plane yagi etc. Affecting j pole gain and pattern but not included in models are.

Categories antennas tags g2bcx j pole slim jim. See more ideas about antenna ham radio antenna ham radio.