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By Forevrbumpn, November 21, 2006 in Subwoofers / Enclosures. So, heres the formula, its simple, you would just need a pen, paper, and calculator. I just had to do something on t-line, and explain quarter wave boxes a little more, the. Tapered Quarter-Wave Tube. This calculator is not expected to give perfect results, but hopefully will be a good starting. W, [cm], - Inside enclosure width.

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Original formula from QST Sept, 1974. I used this formula and it seemed to work pretty accurately for centre loaded quarter wave antennas on the 160m band. The original formula was in inches and feet, so with Jack’s permission, I have modified the script to work with metric units, and this is presented below. Frequency MHz Length of vertical or dipole element Metres Coil position (Distance from feedpoint) Metres Wire diameter (Millimetres) mm Loading coil calculated inductance µH The calculation refers to either a loaded 1/4 wave (typically a vertical, in which case flip the picture below through 90 o) or a loaded dipole, in which case the dimensions refer refer to one arm and two coils will be required. I used centre loaded. Base loaded will require a lower inductance and more towards the top will require more inductance.

The antenna can therefore be matched by creating a fixed inductor at say the centre and moving it up or down until you have a good match on your desired frequency. You will need a good ground system with an end fed quarter wave, but use two in a dipole for a nice shortened loaded dipole antenna. Hi John, I am very happy to find your web, since I want to build a short 80m antenna.

I would like ask you comment; 1. If I use two different aluminium tube sizes (smaller size slides into the bigger one) for radiator, which diameter I should consider in above calculator? I plan to build dipole antenna as the calculator described, which is better, vertical or horizontal polarization? The antenna intended for DX’ing. And I plan to raise it about 6-8 meter above ground.

Or, do you have other and simple design for 80m antenna for very limited space and capable for DX ing? Thank you very much for your kind attention. 73′ YD1CZK, Soesanto. It would be difficult to calculate. You might have to experiment by adjusting the inductance.

I would go with vertical for DX. Not sure how you would do this though if its only 6-8 meter above ground. Elevation is key for DX work, to get the low angle of radiation. Limited space and DX, it would have to be some kind of vertical. A loaded quarter wave made from wire on a fibre glass pole would be my choice for a portable setup. Maybe something more substantial for permanent outdoor use. Jim, I stumbled upon your page here and it helped me build a nice 1/4 wave vertical for 6 meters.

I wanted an antenna on a top mount for my pickup, shorter than required for actual 6 meter 1/4 wave. I used your formula and wound the coil directly onto a cut-down Shakespeare VHF marine antenna cut to 30 inches and machined a stainless plug for the top with a hole and setscrew for a 1/8″ whip. It clears about everything. I finished the antenna after matching with a length of shrink tube to cover the lower section. It matched up almost right out of the box.

Thanks for the great info and easy to use formula.

What is a transmission line speaker? Also called acoustic labyrinth or maze, the transmission line speaker design is a type of enclosure that follows a simple concept, yet hard to achieve.

The design is pretty straight forward, but the hard part is that there is no reliable software to model the enclosure results in an accurate fashion. Of course, you can model the dimensions and internals of the box, but the problem is the damping material. The transmission line speaker design relies on heavy use of dampening material. The different types of material used, the amount, the thickness, the location where it is placed, all contribute to a different end result. That’s why it is very hard to predict the result with a transmission line. The ways you can place damping material inside the enclosure are practically endless.