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Nero Start Smart 10 Free Download Italiano on this page. Before we start, be prepared to experiment! The calculator will get you close (or spot on if you’re lucky), but there are so many variables. You can use an antenna analyser to easily find if you are too long or short. Tuning can be done by adjusting the 1/4 wave stub length and the feedpoint position. To bring the resonant frequency up, shortern the 1/4 wave stub.
To bring the resonant frequency down, lengthen the 1/4 wave stub. Bandwidth is much narrower than a centre fed dipole due to the tuned matching section, which makes building the antenna more critical.
Before we start, be prepared to experiment! The calculator will get you close (or spot on if you're lucky), but there are so many variables. You can use an antenna analyser to easily find if you are too long or short. Tuning can be done by adjusting the 1/4 wave stub length and the feedpoint position. To bring the resonant.
Tuning should be done out in the open and away from the ground, or the final mounting position if possible. OK, now thats out of the way, lets continue This calculator can be used to design a Slim Jim or a J Pole antenna. 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. Add a loop of string to the top, and hang it on a tree branch, use it with your handheld transceiver, then roll it up and put it in your pocket when done! A Slim Jim for 2m (145MHz) will be 1. Srs Street Racing Syndicate Pc Game Download Free Full Version. 5 metres long, and 70cm (433MHz) will be 0.5 metres. Alternatively, for permanent installations, the copper tube or aluminium J-pole is a good choice. I have had good success with both, but regularly use the balanced feeder Slim Jim mounted on a 9m fibreglass pole, as can be seen in the photo at the bottom of the page.
It is recommended to use some sort of choke at the feedpoint. Three turns (for 145MHz) of the coaxial cable around a 40mm former (PVC pipe etc), or taped up and hung freely is adequate.
Five turns, 6cm diameter for 70MHz. I have also used a clip on ferrite or two for VHF.
As with any balanced feed antenna, this will help prevent the braid of the coaxial cable from radiating, and becoming part of the antenna, and therefore affecting SWR and performance. You can check the effectiveness of the choke by touching the coax below the choke and if the SWR changes significantly, your choke is inadequate. The spacing between elements, I have shown as 45mm on 2 metres. This is not critical. It will have some effect on where the 50Ω feed point is, but i’m sure you’ll find it!