Rest easy in the knowledge that your antenna is held high by nothing less than the best of the best! Monday 8/1/2022, Multi-Function Guying Kit, for Tactical Mini Mast, Each, 5.0 out of 5 stars
Lets see how much this increases wind loading. Note that the pictures show the guy rings with their natural zinc plating before we paint them. This is a custom order part. We have a new discussion group (https://groups.io/g/mastrant). Guy Rings for the aluminum or fiberglass mast sections: Each guy ring is laser-cut to our specifications and is 3.5 inch OD, 1.6 inch ID, and 0.125 inch thick aluminum.
They have a very strong grip, yet they can be removed easily even after years of installation. The above data is interesting especially in the consideration of structure & design of the antenna - to what extent the components and the boom should be dimensioned and reinforced to avoid bending. TOLL FREE: +1.800.203.2658 This is similar in case of guying into 3 directions, which increases the load on the mast. We are offering 3/16-inch Quick-links, rated for 660 lbs, and. The Base Assemby will work with either the standard or ribbed-sided aluminum sections. We will divide this task into the following marginal situations - in the first case, the wind is blowing from the guying direction; in the second case, the wind is blowing in between the guys. Overall length is 11 inches and width is 5.5 inches.
The peg has got a 5mm diameter hole usable for attaching guy lines with shackles or rings. Skip to the beginning of the images gallery, 25 Foot Premium Telescoping Fiberglass Mast - TFA25-FG, Premium Tripod For GigaParts' Premium 25 Foot Masts - 25-TPD, GigaParts Mast Finial Antenna Mount , 161-00-0, Guy Ring Kit for GigaParts Premium 25 Telescopic Masts, Blemished 25' and 34' Telescopic Mast Guy Ring Kit, Cushcraft R-8TB Vertical Antenna Tilt Base. This is for simplicity - the reality definitely tends to be different. You need JavaScript enabled to view it. The steel material is 5/32 inch thick. Priceis $45.00 each, plus packaging & shipping. Depending on your total height and top load (antenna, mount, pulley, etc.
These allow for quick and easy attachment of the guy lines. From the theoretical perspective, which is probably boring for most of us, we move on to practical effects. Actually i use 3 of them, not 4, this way the kit is even lighter, and faster to rig, i attach the lines above the 2nd joint (3rd section) with a small rope with 3 loops on it, and i use 3 very small carabiners to attach and for fastening and adjusting the position. When the wind is blowing from the direction of the axis between the guys the situation is somewhat more complicated, because we have to bear in mind the angle between the guys - in other words, to how many directions the mast is guyed. If the wind is blowing from the point of guying direction, it is a simple composition of forces - the case of a right triangle where one of the legs is the mast (h), the second one the distance between the mast bottom and the point of guying (r), where the guy rope is the hypotenuse (l). Lengths of guy ropes - simple linear layout, Lengths of guy ropes - user defined anchoring heights and distances, Place (point) of mounting = the place where the guy rope is mounted (attached) on the mast, Height of mounting = the distance between the point of mounting and the mast bottom (base, labeled HKI), Groung anchor point (Guying point) = the place where the guy rope is attached to the ground (or other fixed point), Distance of guying = the distance between the guying point and the mast bottom (base, labeled RKI). heavy-duty base assembly (used in our Vertical Antenna Kit) is made from two pieces of composite material (high density polyethylene and wood flour) fastened with long lasting stainless steel hardware and includes a heavy duty zinc-plated steel U-shaped pivot piece. (fig. If we substitute the known values we will calculate the original mass and the mass of the frost. The pivot piece does not lock into a vertical position; therefore, guying is required to maintain the mast in a vertical position. Why are you guying the vertical so low down?, Will this rope be strong enough?, Will this mast be able to carry the antenna? and so forth. It is not easy to admit that the antenna consisting, for example, of tubes with 24mm in diameter with 1mm wall increases its mass in a 100% frost by 4.4 times! when ordered with guy rings. In our considerations, we also do not deal with the behaviour of the antenna itself - we assume that the antenna on the mast does not change. Tax) prices when ordering. Another motive for writing the following article was to include the questions asked either by my friends or emerging on their own, e.g. 2). So the force on the mast (in its axis) is Fst = Fant * h / r, and the force acting on the guy rope is Fko = Fant * l / r. We will calculate the length of the rope by the Pythagorean Theorem: l = (h2 + r2). Details here. Copyright 2022 by DX Engineering | Trademarks, SOTAbeams Multi-Function Guying Kit for Tactical 7000hds MFGK-7000, SOTAbeams Multi-Function Guying Kit for Tactical Mini Mast MFGK-MINI, SOTAbeams Multi-Function Guying Kit for Travel Mast MFGK-TRAVEL. Their experience indicates that frost on the components adds up to 50-100 % and in extreme cases up to 200 % to their original diameter (the component then increases its diameter). Putting the mast up the second time is much easier with 2 people. Simply slide the belt over the mast. The belts are very flexible and lightweight and transfer the forces into the mast over a very large area, thus preventing damage of the fiberglass tubes. var path = 'hr' + 'ef' + '='; These are very easy calculations - if you wish to design an antenna system for extreme frost, multiply the forces by 3. Just to complete, one more paragraph - observant readers have definitely noticed that it is not about absolute height and distance - we will get the same results with mast of 20m and the distance of 20 and 10m. the phrase guying in the middle of the mast will have to be understood as guying in the middle of the vertical. Zinc-plated steel "square-U" ( |_| ) piece suitable for using as a pivoting base. 1), the following forces will affect the system: This set of forces will produce a reaction so that the resulting forces will be balanced. With temperature below -4 C the possibility of frost creation decreases and at temperatures below -12 C frost does not occur or is very weak. We do not paint the Quick-links. Results 1 - 3
There is a matching 3/8 inch round hole in the top of each leg, and a 3/8 inch square hole in the bottom. Get The Card, Get The Gear, Get On The Air. That said, a team of 2 made the initial set up, integrating the kit to a Travel Mast, very easy. We now provide them in unpainted aluminum. 2021 Henry Pollock K4TMC. If we simplify the antenna (in our case a tribander) to several cylinders, then the characteristic dimension is the diameter and Re equals roughly 104 in normal conditions while the resistance coefficient of the object C is approximately 1.2. This email address is being protected from spambots. +39 3282899664. Great product, works perfectly with my 10 meter fiberglass pole. This heavy-duty base assembly (used in our Vertical Antenna Kit) is made from two pieces of composite material (high density polyethylene and wood flour) fastened with long lasting stainless steel hardware and includes a heavy duty zinc-plated steel U-shaped pivot piece. The carabinersAHOS##with a smooth surface might be the right choice. It's a good match for the fishing pole masts, and helps keep things stable. This doesn't sound very scientific. Unit 1 The Green, Fountain Street Macclesfield, SK10 1JN, UK, All prices are in GBP 2022 SOTABEAMS Sitemap eStore Maintained by QeRetail, 30m high quality braided Hi Viz nylon guying line, Wire Winder for easy storage and rapid tangle-free deployment, one specially designed guying ring 31mm internal diameter, Telescopic Masts - SOTAPOLES (7m and 10m), Compact light-weight 10 m (32 ft) "Travel mast", Versatile Top Antenna Insulators (5 pack), Three-band portable dipole antenna system (Band Hopper III), Bandspringer Midi , end fed antenna, 10m-60m, Four-band portable dipole antenna system (Band Hopper IV), Two-band portable dipole antenna system (Band Hopper II). Would it be handy to have something for quick attach or release with a hand? Hence, as indicated by the name of this article, its main subject is focused on how to guy the antennas. , or some form of metal hook assembly, for attaching the guy lines to the rings. This should be acknowledged especially in situations where the guying point cannot be placed at a level perpendicular to the mast (it is on a slope). document.getElementById('cloake7b9dcf6b2572fc8470c0acff41768a0').innerHTML = ''; As you can see, given a sensible layout, forces caused by such high wind are not so huge. For all the other super functions of our goods, please visit the e-shop. Piece is 2.25 inches long, 1.5 inches wide with an inside spacing just right for a snug fit on the female end of the aluminum mast tube. Not had any rought weather to contend with yet and may need to consider more substantial pegs (less likely to rotate). Here are several key benefits that GigaParts' remium Telescoping Fiberglass Mastsoffer: Purchase your 25 Foot Premium Telescoping Fiberglass Mastat GigaParts today! Simple but effective design, easy to use. So if the diameter of the components increases 2x, it doubles the wind force.
: : : : . document.getElementById('cloakeb531f154764a973c88a8d5d93d53fc4').innerHTML = ''; However, the force grows at a similar pace so you can then understand what a tornado with its wind velocity reaching over 300 km/h in its centre can do, so please do not think that cars flying the air are a mere invention of the American filmmakers. var addy_texteb531f154764a973c88a8d5d93d53fc4 = 'info' + '@' + 'mastrant' + '.' + 'com';document.getElementById('cloakeb531f154764a973c88a8d5d93d53fc4').innerHTML += ''+addy_texteb531f154764a973c88a8d5d93d53fc4+'<\/a>'; Guying the masts and vertical antennas - 1. & Fax +39(0)627858223 Mob. The larger section of composite material has 6 drilled holes that will accept the ground stakes, or you can use 3/8 inch bolts (not included) to attach to other surfaces (fence posts, tree trunks, concrete pads, deck floors, etc.). Please. Fiberglass reinforced plastic guy wire mast kits that include a mast, cable, turnbuckles, thimbles, clamps, sleeves, and anchor plates. The previous chapter shows that the resistance force of the wind is directly proportional to the surface of the antenna perpendicular to the wind direction and, therefore, to the diameter of its components. For its calculation, we need to know not only the thickness of the frost but also its density. I repeat again it is an example to show the impact of guying distance and the number of directions to which the mast is guyed. And one of the most important and maybe the most challenging task is to get the antenna into the air and keep it there. A short length (7-inches) of aluminum mast section is included for easy connection to your mast sections. A 3/8-inch diameter zinc-plated steel hinge pin is included to fit the pivot piece. So yes, following the instructions carefully, the guying kit is just the job. We accomplish this by committing all of our resources to achieve superior customer satisfaction. As a matter of interest, Wikipedia states the following about frost: The frost is an atmospheric phenomenon that develops by creating ice crystals on the surface of the object by inflicting the following effects: freezing tiny droplets of the air's humidity (clouds, fog etc.) FAX: +1.828.412.4270. I was surprised about that. that the force is proportional to square (squared) velocity (e.g. On the other hand, it is necessary to consider that the conditions for creating continuous frost on the entire perimeter of the tube, especially on those with larger diameters, are relatively rare in ordinary QTHs. Customer Service Hotline The value of the resistance coefficient is not constant, but depends on the so-called Reynold's number - non-dimensional criterion, expressing the ratio of inertial and viscous. TerraStat TS510 Dissipation Terminal (Horizontal). Rope tensioning clamp ATC12suitable for Mastrant ropes with a diameter of 4 to 14 mm. The frost, which is a very important element in our calculations, affecting the function (as well as survival) of the antenna, causes. They can also be use as insulated boom mounts for yagi elements. Therefore we are not interested in the mast or rope properties. var prefix = 'ma' + 'il' + 'to'; Note that the pictures show the guy rings with their natural zinc plating before we paint them. These allow for quick and easy attachment of the guy lines. We aspire to the highest level of excellence in our risk mitigation evaluation, product & technology offerings, design, and systems services. addye7b9dcf6b2572fc8470c0acff41768a0 = addye7b9dcf6b2572fc8470c0acff41768a0 + 'mastrant' + '.' + 'com'; We can determine the resistance force acting on the mast in a similar way. It is the angle formed between the guy rope and the mast. The reaction will appear in the gripping of the mast bottom and in the places of mounting of the guy ropes. The Quick-links offer a nice smooth surface to tie/wrap guy lines. Martin Huml, OL5Y/OK1FUA, This email address is being protected from spambots. Default Sort, Multi-Function Guying Kit, for TAC7000HDS, Each, Estimated Ship Date:
That is again a completely different topic. For the best experience on our site, be sure to turn on Javascript in your browser. They are especially suitable for permanent installations and superior to all other locking mechanisms (tape, glue, cable ties..). Send Tel. The following table illustrates forces calculated for several typical antennas (I apologize to those who cant find their exact antenna in the table, please just extrapolate). For instance, calculations of forces acting on the antenna in the wind or other matters might be useful. A short length (7-inches) of aluminum mast section is included for easy connection to your mast sections. Unless stated otherwise, we assume that the mast is built on a horizontal surface; therefore, the ground guying points and the mast bottom are at the same level, perpendicular to the axis of the mast. The mass of the object m = V * , where V is the volume and the density. What brings the autumn new to our e-shop? If we look at the simplified model of the guyed mast and the antenna at its top (fig. var addyeb531f154764a973c88a8d5d93d53fc4 = 'info' + '@'; We recommend the use ofQuick-links, Snap-links, or some form of metal hook assembly, for attaching the guy lines to the rings. Clamps are the perfect method to securely lock the segments of the fiberglass mast for a long period. There will also be a flexible deformation of the mast and the ropes. The place where this axis intersects the connecting line between both of our guying points is a point that represents the virtual guying point for the calculation of acting forces. Since we are interested in the amount of increase of the mass of the standing antenna, we also need to know the density of the material, which it is made from. You need JavaScript enabled to view it. Very good material was used,
Subscribe to our email list for special offers! (I promise that the following text will be without formulas - they would be much more complicated ). If you want them in olive drab to match the mast sections, please specify in your quote request. Click HERE for HOT special offers! This can be hardly calculated at times, that is why it is possible to calculate and measure the length of the guying rope - in this case being 13*1,41 = 18.3m (1,41 = 2). 290 N). is $7.00 each, or 3 for $20.00, when ordered with a box of mast sections. So - we let the wind blow on the tribander at 130 km/h. Complete set: Contains 11 stainless steel clamps with rubber padding. Provides an adjustable 4-guy system for maximum stability. There are perfect for field work! A 3/8-inch diameter zinc-plated steel hinge pin is included to fit the pivot piece. A brief remark about the calculation: for the sake of simplicity, we would again consider an antenna consisting of tubes or rods. and the material of which it is made, especially its physical properties such as density (specific gravity), flexibility and strength. We do not paint the Quick-links. or In the following tables you will see the force calculated for both versions of guying (3 and 4 directions) and for the guying of 10 and 5 m. I think it is obvious that bringing the guying points closer to the mast results in unnecessary increase of the acting forces. The larger section of composite material has 6 drilled holes that will accept the ground stakes, or you can use 3/8 inch bolts (not included) to attach to other surfaces (fence posts, tree trunks, concrete pads, deck floors, etc.). Guy Rings for the aluminum or fiberglass mast sections: Each guy ring is laser-cut to our specifications and is 3.5 inch OD, 1.6 inch ID, and 0.125 inch thick aluminum. If we place an object in the fluid stream, in our case the air, it will cause resistance by the friction and pressure elements. The price of the lightweightness is that they bend quite easily especially on rocky surfaces, but with a very small caution, they work just perfect ! I wrote about this subject in the article How to build and guy simple antenna masts (magazine Radioamatr 2 & 3/2004). This is strong high-quality 6061-T6 aluminum. In other words, e.g. Although the density of ice is 917 kg/m3, the density of frost stated in literature and standards is considered 400-500 kg/m3 - let 's calculate preferably 500 kg/m3. of 3, 25 Records Per Page