There seems to be a problem completing the request at present. Only one more section to go, disconnect the falling derrick from the connection pointandlowerthestructure by pulling on the top guy, opposite the falling derrick. Online Service for Determining Fundamental Value of Basic Wind Velocity and Basic Wind Velocity Pressure with Display of Wind Zones in the United Kingdom According to BS EN 199114, I have 3 of these 3m ones in the shed waiting for my HAM radio passion to come back. Attach 4 first stage guying ropes to the top of thismast section and manually hoist the mast to the vertical position. The electrode This may mean having to install double lashing brackets to support your antenna on the chimney and T and K wall brackets to support it on a wall. So please be warned. demolition hammer. A double crank mast is very similar to the Swan Neck mast except that it will allow you to extend much further away from the fixing bracket allowing you to clear deep soffits etc. Reconnecting lengths of ropes with knots will give you a different tension each time but with the set-and-forget carabina, thats one less job to worry about. Just before we start fitting the 25 kilos ofadditional weight of hardware to the structure, I personally find it necessary todo a final lift with some weight. Obviously, these are very heavy and not the easiest thing to getup and down a ladder so please be very careful if youre installing these and it may require two of you to do so. The bracket is fixed to the roof structure by long coach You will be connecting and disconnecting this guy point regularlyduring this process, so for ease of expression, well call this the connection guy and I recommend that once this distancebetweenthe falling derrick this guy stake is accurate, fit a carabina. This job is not for the feint-hearted. With section one lying n the ground,release the little stub mast from the top of section one and in its place, put in the middle 6m (20 foot) section. You will have a small spare section (1 metre) of stub mast that you can use temporarily to fit on top of the first section with a scaffold connector to slip the first guying point over. Its also worth mentioning that you could use a 1.5diameter mast below 6 and a 2 below 10. pictured here reaches through into the rafter. The main difference and the reason I included it in this blog is because the mast cranks at 90 degrees in two positions meaning that it can fit in a smaller space so may serve a purpose. Assuming that you followed my instructions, you can release the connection point and have a team member gently pull on the 30m long pulling-over rope. Providing you post your question below and are patient with for a response I will help out where I can. Now fit the last section and repeat the process as you did when you connected the middle section. A small aluminium plate was cut to fit behind the We had the guy stakes made for us, at considerable cost (and a total waste of money since you can buy these from Barenco or your preferredhardware supplier) and procured the requisite amount of cheap 8mm (just over quarter inch) lorry rope in black. I have written these below with my personal suggested maximum height to install these: 1 diameter 5 maximum height (I personally only use the J mast types which are 3). I would definitely advise choosing the 1.25. Assuming the geometry is perfect, you will have an almost balanced see-saw with the tow-rope allowing the assembly to tilt over. I should also mention that the smaller the number in gauge is actually thicker in mm. However, you will need planning permission unless: {"modules":["unloadOptimization","bandwidthDetection"],"unloadOptimization":{"browsers":{"Firefox":true,"Chrome":true}},"bandwidthDetection":{"url":"https://ir.ebaystatic.com/cr/v/c1/thirtysevens.jpg","maxViews":4,"imgSize":37,"expiry":300000,"timeout":250}}. dedicated driven earth electrode. mechanical damage. You will need to build this on very flat land. Please DO NOT CALL OUR TELEPHONE LINES. Mobile Phones, Smart Watches, Accessories & Communication, 1 product ratings - 33 ft 10 metre six section portable telescopic aluminium mast, 7 product ratings - 3 Way Guy Ring Spider Mast Collar Wire Rope Galvanised, 4 product ratings - Made with Kevlar Guy Wire Mast Support Line 164 feet 50 Meters, 3 product ratings - Ham Radio Antenna 430 - 440MHz 70cm Base Station Dipole with Mast Clamp. Now take a picture sinceyou are almost half-way there. I made the guy points from aluminium plate and had them sit on nylon washers that I cut out. Another mast consisting of a 6m length of 40mm nominal A hole 20mm in diameter was drilled through the existing I found that it was top-light at this stage so the team member thats pulling over may need toput his weight into getting the lowering started. I hope the above helps you pick the right mast diameter for you based on the height. You will need to connect each vertical section together. Earth resistance by the 3 wire falling potential method Of interest, I pushed the limits of this technique and built an 80 foot version. I will be getting a 20 ft long scaffold pole to use as a mast for an antenna (not sure what one yet). Perfect if you only have a small job. It is important when installing masts for TV/ FM aerials that 1:5 ratio is followed. needed. Is a Dipole better than a Cobweb Antenna? Once vertical, snap the connection guy in place and observe your handy-work. Although antenna masts can be fitted on vehicles like cars and caravans to receive radio or TV signals, they're also used by radio ham enthusiasts to send and receive messages from all over the world. Note: Never conduct a shake test on a loose tower, or with the falling derrick disconnected from the connection point, it could collapse. Note the eye and eye Of course you could try and find a stainless steel pole but I have yet to find one. A 9m telescopic TV style mast is supported in scaffold So far I have discussed the aerial mast length, diameter,wall thickness and metal used. earth rod. The mast is mobile, rather than fixed permanently in place. If you do have a current setup I should be able to copy you after 8pm tomorrow night. Have one or two team members hold the pole upright whilst those that are knot-minded can attach this vertically to the guying stakes. Be very careful now because unless you have continually secured the tow-rope, the pole could crash down causing very serious injury even death. This means that the pole has been hot dipped in zinc to help preserve it. nailed to the fence rails to form a horizontal cable trough. There is no bending torque on these sections, they are only to hold them steady. Is there nowhere brick built to instal it ? My calculations on the installation indicate that its Your Free Guide is on it's way, please check your e-mail now! The only time I would choose a steel mast would be for a satellite dish as this wobbles less and this would typically be in the form of a scaffold style pole. That's pretty much what I want. Copyright 1995-2022 eBay Inc. All Rights Reserved. This may be that height is needed to help you get a stronger signal and look over nearby obstructions like neighbouring buildings and trees. Longer ropes stretch more and unless you do this with steel rope (nice idea actually for a permanent structure and a winch, perhaps all solid steel poles?) A 3 diameter pole is also possible to purchase but to be honest these are not common and you would need a special clamp to attach the aerial to the pole. Type of antenna: Make sure the mast is suitable for a directional and/or omnidirectional antenna. View basket for details. If you try and correct this, you will find that once erect, there will be too much tension on the top guy points. The next item for consideration is the wall thickness of the pole. I explained that I wanted something tough - it's no good having an anemometer waving around when it gets a bit breezy - and he fitted a 4m 2" heavy-guage steel pole on T&K brackets for 80 all in. in your position I'd still go for the shed mount but with 2or3ft slid into a bit of gutter down spout set in concrete. OP: Craig. This is why we used carabinas. You must log in or register to reply here. I got the antenna guy to do mine with I think it was a 32mm ally pole - 2 scaff pole is way, way overkill for this job. ohms. This creates a far bigger stand off than the Swan Neck mast. Cheap scaffold connectors will do the job adequately. Use a good spirit level on the lower mast pole and with your eye, make adjustments to the 8 guy ropes and the structure feels very solid. This is very similar to the AWG system. I did this and it missed me by a whisker. It is bonded to the pole using 25 square mm copper I also stock a few 3 J masts which I will come to in mast type. The lower end regular bull point which was cut off, annealed and drilled with a blind This includes up to two TV or satellite antennas installed on roofs, or for separate structures which measure under 3 metres. FREE next day delivery available, free collection in 5 minutes. I've setup my antenna pole on my shed with quite small brackets bolted as you say with a plate around the 2x3 struts. The electrode was driven in less than a Apart from these uses, antenna masts are commonly utilised to mount CCTV surveillance or lighting systems both permanently and temporarily. by Arby80 16 May 2012, 20:06, Post This rope should not be tight, but have a small amount of play so that you could perhaps pull it away from the mast by about a metre (3 feet). Location: Antenna masts can be mobile, or be set permanently in position. How to Live Stream your Ham Radio Club Station or Home Shack for Special Events and Contests, How to cause massive Ham Radio QRM with your ALC in Digi Modes, Fix local QRM & QRN in your home Amateur Radio Station in 10 minutes, How to Connect XLR 3 pin connector to your 8-Pin Radio. If they are a bit long a bit can always be hack-sawed off the bottom of the pole. You will probably be able to pull it vertical by hand once its say at 70 or 80 degrees. The tornado is a copy of the antenna I use and so it should be a low noise antenna for the rx and with the radials it has a nice low angle of radiation. You will find, due to the way sin and cos works (back to school!) These are reserved for CUSTOMERS ONLY and we only serve a small area in the South East of the UK. Some people mistakenly call this arrangement a gin-pole tower however thats incorrect; the arrangement shown in the drawing is called a falling derrick. If the ground is sloping, build it so that the falling derrick is either facing away or towards the slope, not parallel to it otherwise the geometry will be impossible. Electrovoice RE20 unboxing ultimate ESSB microphone for ham radio, Heil Sound Ham Radio Pro 7 Headset Review, How to build a monoband HF Vertical Quarter Wave Ham Radio Antenna. What are we waiting for? More questionable is how thick is the timber of your shed ? He owns an, DX Commander Short-Spike for ground stability 3D Printing, Phasing Harness Calulator for 71 and 84 degrees. A couple of years ago I got a local TV aerial guy to put an anemometer up for me, and I needed to get 3m clear of the ridge to avoid turbulence (so at least a 4m pole). ", "Smart Aerials were very helpful from start to finish and resolved a number of challenges in the final stages of the project without issue. This is that the bracket size and spacing should be no less than one sixth of the overall mast height. For all you need to know about the difference between FTTC, FTTH, ADSL, & VDSL internet connections. Trial and error required. JavaScript is disabled. Click below to see all of our DIY guides. Inc tips/ advice on utilising PoE for your installation. Now I will discuss the mast types to help you choose which pole is best for your installation. single brick which has been retained undamaged to restore the wall when Using a 6 mast as an example the first bend will be approximately 1 from the end of the mast at about 45 degrees, the second bend will be approx. The downwards pressure on the bottom pole / tube was so great that it buckled and the whole structure collapsed blowing a hole in my wallet. This is what I call the Hoist Rope and is why theres a load of blue rope alwayshanging around under therig here in my pictures, its the rope I will eventually attach to my tow-bar to erect the whole thing. Cables are routed to a patch panel on the interior wall 26TM175. dissuade unauthorised climbing.). A 20 ft pole with an antenna on top can deliver some immense strain. I didn't have an 8ft length of down spout in mind. All rights reserved. turnbuckle and that the D shackles and turnbuckles are moused Post To be on the safe side, you should properly calculate the wind load of the antennas and the pole itself and then select the appropriate pole that will stand up to the wind load. I need to explain one engineering issue that will manifest itself once the whole structure is built. Obviously, youll need a fewpoles (tubes) and have them pre-drilled with the guy point bolts and eye-bolts for anchor points on the falling derrick. Also because of the high metal content they cost a fair amount more also. The mast is easily extended As I already touched upon the higher the mast height the larger the bracket size and mast diameter to support it. 2m above. I will get to this later on in the blog. Even then I would try and use a 6 wall bracket and a straight mast if it fits as this would provide a stronger fixing. But like Bob's antenna you need a flexible pole between the scaffy and the base of a decent 5/8 or 827 antenna. mechanical damage. four N type bulkhead connectors mounted. then you will see droop. Height: Take into account both the extended and retracted height of the mast. With those antennas, most probably the wind load dominates the requirements for the pole rather than the weight of the antennas. If you're thinking about upgrading to Sky Glass, Sky TV's latest service. I would use these for satellite dish installations and a client that we install wireless broadband systems for, as they insist on the use of these to minimise mast wobble. of the building via a steel duct which provides room for Mounted mine on a 10ft pole from toolstation, its been up 2 years now, no problems at all with the wind and recent storms. Suitable for installing TV & Wi-Fi aerials. The structure will tilt in a scary fashion and then you can jump in the car and lower the structure to the ground. regular bull point which was cut off and an adapter These are fine for 90% of aerial installations in my area. Now you can connect the fourth guying point to the end of the falling derrick, guestimatingthe tension to apply here. steel. How long is the cable on that antenna ? The earth conductors are attached using a In this article I will discuss many of the common types of masts along with how we difference between them. (820Hz) at the end of the driest summer in 30 years was 8.6 plastic plate to bond the coax connectors to an earth cable ohms. Only 2 0r 3ft would be needed to stabilize the pole. I designed this with 3 x 6m (20 feet)uprights and I used a section (and a half again) for the falling derrick, as shown in the diagram. 15.1 mm hole, then re-tempered. You are using an out of date browser. Each of them has their own benefits. The guys are 4mm 7x7 G1570 FSWR. Not guyed, as the sway takes all the strain off the actual antenna. Inc info on cost, TV sizes etc, Read this for all you need to know about Power over Ethernet (PoE) & PoE networking. electric demolition hammer. experimental VHF / UHF antennas. 1.8m straight aerial mast. Now you will need a tow-bar. Look in your rear-view mirror. No need to talk any more about this. The discone mast and patch panel are earthed via a by MrWeetabix 17 May 2012, 17:21, Post wind survival is limited to limited to about 80Kmph The pole is equi-potential bonded to the electrical To do need a larger mast is needed. Now grasp it firmly and imagine about 20 or 30 kilos on top. 1 extension away from the fixing bracket. How do I decide? Gently lift the three sections into the air with the vehicle and stop whenthe mast is just a few feet off the ground. As I said at the beginning of this blog the natural partner to it is our previous blog on wall brackets so please check that out after youre done here. experimentation; to be able to work comfortably and securely on the antennas Purpose: Some masts are custom-made for certain types/makes of vehicle or for larger loads. As not all antenna installations are the same the aerials need to be installed higher of lower depending on the installation. They seem to be for fairly lightweight TV antenna. to be able to install antennas at a height of about 10m for You will need a further 8 ropes now, 4 long ropes and 4 even longer. For large poles and high gain TV aerials & FM aerials which are typically much larger in size I would advise perhaps an minimum of 1 quarter of the overall mast height to allow for wind loading etc. Most steel masts for aerial/sat are galvanised. swivel clamp welded to a mild steel formed bracket. I had the idea ofplacing the rotator between the two top sections and this would have worked as a temporarymast bearing. A single section builder's ladder can be leaned on the When you finally have 60 feet of poles, a rotator and maybe a tribander on top again, reducing pressure to any of the guy ropes may result in a collapse. Fan Dipoles for Ham Radio Made Easy Overview How To, 40m Vertical Antenna Phased Array or Vertical Yagi? The steel The mast is equi-potential bonded to the electrical I would choose the latter. medium size line tap which fits over the earth electrode. It is simply a straight mast with a screw type fixing to which you bang into a loft beam/ strut and twist to fix into position, no tools required. This section should have a guy point ready in the middle of the pole. Lay the tube flat on the ground and insertinto the swivel base. bending the Heliax and weatherproofing for the opening in the brick As it sounds, just a straight pole. the post is closed off with a draining cap fabricated from 3mm mild Gravity alone should keep the mast upright, however youll need a small connector rope in the futurefrom the bottom of the falling derrick to the master guy point. So how do we lower the tower? Reconnect the connection point, call your ham radio on VHF chums and tell them what you just did! At this stage, if there are any geometric corrections to make, I suggest you do so now andmakesurethat the 4 major guy ropes are tensioned nicely with the falling derrick attached to the connection guy stake (which will regularly need to be released and reconnected. This is commonly known as the mast gauge. mild steel bracket prevents accidental My Name is Conor, I am a liar who forgot I came from 11m SSB. Mast/ poles for antennas can commonly be purchased in the following: 20G 0.9mm This is very thin, I dont these, 14G 1.8mm These are good for high masts and satellite dishes where mast movement needs to be minimal. Personally, I prefer a mast and swivel bracket for loft installations but I can see why these may have some appeal. Connect 4 ropes to this guy point and lay them out to each guy point. I recently wrote a blog on the types of wall brackets for TV aerials & satellite dishes and I thought that the natural partner to this would be a blog on different types of bracket/ mounts for aerials, so here you go. The tow rope will just find its equilibrium. A driving adapter was made from a A J mast is a mast in the shape of a J, believe it or not.These are usually of a 1 diameter (the only 1 mast that I would use) and a single bend which forms the J. I must admit that I try to avoid these where possible as a far stronger fixing can be achieved with a straight mast. The electrode Callum lives near Solihull with his wife (Wendy) and two children. With guys, the mast should withstand 150Kmph. Something went wrong. But wait, you cant lay out the rope to the connection guy stake because the falling derrick is now vertical. Ladder pegs are installed to safely and securely support I never use these masts and I would always try to use T and K wall brackets and a straight mast for a much stronger fixing. A long banana shape is fine, in other words if you note say a 5 degree droop, its not a problem. IMPORTANT: When de-constructing theassembly,you will end up at a time when either the falling derrick or the last mast section is vertical in the air. (820Hz) at the end of the driest summer in 30 years was 16 here is attached to a cleat fabricated from mild steel with a chain The only real time I would use these outside would be to mount onto a fascia where there is a limited fixing space. The base hinge needs to be secured lightly, however there should never be too much lateralpressure on the base, only downward. Yeah seen those. The antenna mast is up for fewer than 28 days per year. for tidy cable management. Does it behave itself? by jonporthill 16 May 2012, 21:11, Post But from time to time these have to be used. conditions. electrode. Good idea? Again like where the mast diameter should be increased you should also consider increasing the wall gauge too. Please also DO NOT FILL OUT THE WEBSITE CONTACT FORMS OR E-MAIL as you will either not receive a response or you will receive a response asking you to post your questions in the blog comment section of the blog you read. that if you connect thelowering rope to a tow-bar and keep it quite tight, a team member can pull on the whole structure, opposite the towing vehicle and the structure willchange from vertical to a few degreesover without moving the vehicle or anything else. The pole is earthed via a driven earth electrode. If youve done your geometry right, the end ofthis poleshould be fractionally short of the guyingpoint. Ham Radio Antennas. Typically when the dish needs to be installed on a wall not south facing, like a north facing wall where the dish need to look over the building to get line of sight to the satellites in space. There are a few different metals which are used for TV aerial and satellite poles/ masts. A mild shake test will show you how well its performing. In other words, imagine manually lifting the falling derrick a couple of feet into the air and considerably reducing the pressure on one side of the structure. The lower guy pointdidnt need any drilling and tapping, it just sits on the scaffold connector. We usedheavy duty roofing pegs anyway. I stock mainly 6 masts personally. It a battle with sin, cos and the inverse square law at work. other two have RG213/U cables attached. by BobRob 17 May 2012, 13:06, Post Ham Radio Antennas, How to build an Inverted L for the low-bands (40m, 80m and 160m), How to make a quarter-wave vertical mono-bander, 4-Element Home-Brew Folded Dipole Yagi Dimensions, Quick SWR Calculator for Vertical and Dipole Ham Radio Antennas, TOKYO HY-POWER HL-700B 600 Watt Amplifier purchase, Adding 80m to DX Commander All Band Vertical (9-bands 80m through 6m), DX Commander Contest Antenna achieves top placed UK IOTA Station, Software Modelling your Vertical antenna ground radials with MMANA, DX Commander now shipping to USA / Canada / Aus, Vertical Antenna How many Ground Mounted Radials Do I Need, M0MCX Banana Antenna an end-fed choke sleeve resonant feedline T2LT antenna design, 20m band End-Fed Choked Coax Dipoles (T2LT), 75 ohm to 50 ohm transmission line matching coax stub, 40m compact fan dipole for 40, 30 and 20m bands, Introduction to the 60m Band Plan (5 MHz), DX Commander pre-production testing all-band vertical, Wear super heavy workman gloves when handling ropes, Use appropriate knots and check them before any heavy lifting (alpine butterfly knots make great loops to tighten down guy ropes into half hitches), Invest in better rope, although 8mm is absolutely fine. Accessories: Check if the antenna mast is sold with all the accessories like guy wires, pole clamp, brackets, and/or bolts. bolts screwed into the end of the rafters. hauling lines. at about 2m above the ground (with a pole belt around the antenna It wouldnt be economical to stock all of these on your van if youre a professional aerial installation. This includes metals used, shape, wall thickness and diameter to help you pick the right aerial pole for your own aerial installation. If the antenna mast isn't sold with all the necessary accessories, these can be purchased separately on eBay. The falling derrick willattached to both the mast and to the adjacent guying points so that as the mast lowers, the falling derrick wont fall over sideways, so go ahead and boltthe falling derrick to the bottom of the first section by the hinge and attach the side-ropes to the adjacent guy stakes. smaller pipe bolted to the concrete. This bracket is fabricated from half of an old scaffold With all hands ready then, you need to release the connection guy and have a team member pull the mastover towards them. Starting with the base hinge, measureout in 90 degree increments, 9 metres to where the guy stake needs to be hammered into the ground. Fit a longrope (like 30m / 100 feet or so) with a steel shackle to it so that itcan slide up and down this pulling-overassembly. This is the place to discuss any general CB radio related topics. Crank masts are used to get around and above obstructions.Like fascia, soffits and gutters or brick that extend out at the top of the chimney. The integrated cleat provides a handy point for securing Please note that when you get to the 2 diameter masts the small V bolts will no longer fit, you will need large V bolts. The tow-rope needs a backup so that when the fallingderrick is in the air, the mast lowered and the tow rope is lifted off the back of the car, the falling derrick doesnt just continue falling over. This is because the smaller mast heights will have a lot less wind-loading on them and are a lot less likely to break in high wind. The earth electrode is 2.4m of 12.7mm copper clad steel Scaffold type masts can also be purchased which have a 4-6mm wall, these are very strong and can be used for installation where they must be as close to no mast movement as possible. fabricated from mild steel. T and K wall brackets can be used to help get the spacing around and above obstructions.
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