Cubical quad antenna includes:
Cubical quad antenna basicsQuad beam antenna with reflector & director2 metre cubical quad design
The cubical quad antenna lends itself to use at VHF and UHF, and a 2 metre quad or two meter quad is easy to make using a few items that are easy to obtain or may even be available anyway. It should be remembered when considering its use that the quad, when fed at the bottom gives horizontal polarisation.
Construction of the 2 metre cubical quad does not require any specialised tools and can be accomplished using the basic tools available to any radio amateur or short wave listener.
At the outset it as decided to make each element the same size, and then use small electrical stubs to extend or decrease the electrical size of the element. A small short circuit stub makes the reflector inductive, thereby effectively making it longer than the resonant length. Similarly an open circuit stub makes the director capacitive and effectively shorter than an electrical resonant length.
2 metre cubical quad construction
Efficient 2 meter Disguise Antenna Made From a TV Satellite Dish This horizontal 'slot' antenna, cut into the reflector of a TV dish, is both the master of disguise and high in performance. Picture 2: measurement setup Operating with a power between 2 and 50W (the factory output of my Icom IC7000), and taking advantage of the contest organized during the summer, when the propagation is good on these upper bands, I was able to perform some QSO in order to characterize my antenna system. QM5 Yagi for 2 meters band - The QM5 antenna is a simple 5 elements Yagi with 1.88 m boom length for the lower 144 MHz SSB/MGM band, I used it mainly for Sporadic-E and MS contacts. It exhibits a forward gain of 9.17 dBd; i.e. 11.3 dB forward gain over the isotropic radiator, while the F/R is about 11.5 dB. The lower the frequency, the longer the antenna. The longer the antenna, the more difficult it is to keep it out of view. A 2m/70cm antenna can be made to look like a roof vent pipe or a weather vane or made by cutting a slot in a satellite dish.
This includes OTA TV antennas, satellite dishes, and fixed wireless internet service antennas. This gives you the perfect opportunity to construct a slot antenna and hide it in plain site. As a practical matter, I live in a very restrictive HOA (not for much longer though, hooray!) and my small antennas escape notice.
Make 2 Meter Slot Antenna
A quad for internal use can be made quite simply by constructing a simple wooden frame. Each element is made up from a cross of available wood approximately 12.7 x 12.7 mm (1/2 by 1/2 inch) wood – it requires tow lengths each, i.e. a total of six for a 3 element 2 metre cubical quad.
Online sports gambling ny. The wood is not critical so see what is available and adjust the design to suit. The length of each member of the cross member of the quad is 720mm.
At both ends of each piece of wood a small slot is cut to accommodate the wire. This slot can be cut with a saw, or alternatively it is possible to drill a hole of sufficient size to enable the wire to easily pass through. At the centre cut a section out as shown.
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In some ways the slot provides more flexibility because it enables the length of the loop to be altered to tune the 2 metre quad to exact electrical resonance.
The next stage is to join and glue two cross members to make the characteristic ‘X' of the 2 metre cubical quad antenna. The two small sections removed from each cross member should slot neatly together.
2 Meter Slot Antenna
Having completed the mechanical construction of the ‘X' frames, the wire can be added and brought to a small two way terminal block. The wire should be of a reasonable diameter, typically 12 or 14 SWG is good.
The wire is brought to a two way terminal block and secured in this way. The coax or stub can then be attached to the connections in the terminal block and held securely.
The weight of the coax should not be left to be held by the antenna wire, but the coax should be loped and secured to the boom or the mounting pole.
The stubs should be around 7 or 8 centimetres long – their length is not terribly critical, and can be adjusted. The wires can be around 14 SWG and left to remain parallel under their own strength. The short circuit one can use a single section from a terminal block. The position of this one can be adjusted to give the best performance.
2 Meter Skeleton Slot Antenna
The boom for the antenna is made out of two lengths of 25 x 25 mm wood. If necessary the spacing of the parasitic elements can be adjusted with these two lengths of wood acting as a clamp. However once all the adjustments have been made then all the elements should be firmly screwed and glued to the boom.
2 metre cubical quad summary
Having completed the mechanical construction of the ‘X' frames, the wire can be added and brought to a small two way terminal block. The wire should be of a reasonable diameter, typically 12 or 14 SWG is good.
The wire is brought to a two way terminal block and secured in this way. The coax or stub can then be attached to the connections in the terminal block and held securely.
The weight of the coax should not be left to be held by the antenna wire, but the coax should be loped and secured to the boom or the mounting pole.
The stubs should be around 7 or 8 centimetres long – their length is not terribly critical, and can be adjusted. The wires can be around 14 SWG and left to remain parallel under their own strength. The short circuit one can use a single section from a terminal block. The position of this one can be adjusted to give the best performance.
2 Meter Skeleton Slot Antenna
The boom for the antenna is made out of two lengths of 25 x 25 mm wood. If necessary the spacing of the parasitic elements can be adjusted with these two lengths of wood acting as a clamp. However once all the adjustments have been made then all the elements should be firmly screwed and glued to the boom.
2 metre cubical quad summary
Although in many ways this 2 metre cubical quad design is rudimentary, it is nevertheless one that can be build with a minimum of tools and expertise.The antenna can be adjusted to provide the best performance for the particular situation in case, however it should not be used externally as it is not sufficiently robust to withstand the rigours of the weather. However when used internally it has given a good account of itself.
2 Meter Skeleton Slot Antenna
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