Does a quad antenna need a BalUn?
If a delta-loop or quad-loop antenna is powered with a coax cable from the transceiver it is necessary to use a 1:2 BalUn. BalUn means: Balanced to Unbalanced. The most important reason to use a good BalUn is to ensure that the coax cable does not become part of the antenna system and therefore radiates as well.
How does a quad antenna work?
The quad “creates gain” by acting like two half-size end-loaded dipoles stacked one above the other with 1/4 wavelength spacing. In a quad, each bent dipole is 1/4 wave long, and they are 1/4 wave apart. We now have 3.27 dBi gain, or 1.13 dB more gain than a dipole in freespace.
Is a loop antenna balanced or unbalanced?
You use a balun for any balanced antenna, to allow signal down an unbalanced signal conductor line (Coaxial cable). So, since loop antennas are balanced, and you want to get their signals to an unbalanced conductor to the receiver, then yes. (By the way, balun is a condensation of terms, balanced and unbalanced.
How does a cubical quad antenna work?
For the Cubical quad beam antenna, the reflector and director work in exactly the same was as for the Yagi, using induced currents in the parasitic elements. This enables the signal in the forward direction of the quad beam antenna to be reinforced whereas the signal in the reverse and other directions are reduced.
Who invented the quad antenna?
Clarence C. Moore
In 1951 Clarence C. Moore, W9LZX, a Christian Missionary and engineer at HCJB (a shortwave missionary radio station high in the Andean Mountains) developed and patenteda two-turn loop antenna that he called a “quad”.
What does a 4 to 1 balun do?
A 4:1 balun has four times the balanced impedance as unbalanced impedance. Balanced lines and loads, by definition, have equal voltages from each terminal to ground. Each balanced terminal or conductor must also carry precisely equal and exactly out-of-phase currents.
Do I need a balun for a loop antenna?
Yes, a balun is needed. All balanced antennas such as dipoles, Yagis and hexagonal beams that are fed with unbalanced feed lines such as coax, require a choke balun. Without a choke balun, common mode RF currents flow on the outside of the coax making the feedline act like another antenna.
Do You need A balun for a quad antenna?
Without a balun the radiation pattern and F/B ratio is often less than optimal. Quad hardware – Italian based company manufacturing quad antennas for Ham operators and also selling quad parts for the do it yourself antenna builder. All About Cubical Quad Antennas – This is the full book by William Orr.
What are the different types of quad antennas?
Shrunken 40 Meter Phased Quads – A 2 element small footprint 40 meter phased, reversible, downsized quad array antenna. Shrunken Quad – VHF quad antenna for transmitter hunting. The Cubical Quad is Beautiful – An interesting page about Quad antennas. Modelling QUAD antennas, comparing quad antennas to yagi antennas.
How do I find out the dimensions of a quad antenna?
For more information on quad antenna dimensions you can use this Quad Antenna Calculator. The quad calculator is a very useful tool which not only calculates element dimensions but also works out the ultimate element spacing for maximum gain and gives you the spreader arm lengths as well.
What is quad antenna tuning?
Information on QUAD Antenna tuning and home brewing with help on calculating dimensions and tuning. The Grid Yagi for 144 Mhz – The Grid Yagi (or Grid Quad) is a high performance yagi antenna that can be built with readily obtainable inexpensive materials.