This may be that height is needed to help you get a stronger signal and look over nearby obstructions like neighbouring buildings and trees. 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. FREE next day delivery available, free collection in 5 minutes. You may need the tow-bar this time, alternatively two team members can probably lift this. Looks good. 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. The only thing Im not comfortable with in these pictures is the falling derrick which in my opinion was far too heavy and totally over-complex. mild steel bracket prevents accidental The eye bolts on the top connect to the mast, the eye bolts on the sideconnect to the adjacent guy stakes and the lower eye bolt has a dual purpose; it connects to the tow-bar and also to the final guy stake at this connection point. There is no bending torque on these sections, they are only to hold them steady. Hoist the falling derrick back vertically again and reconnect to the side guying point. Id still end up with a 9m long falling derrick, but it would be lighter and easier to construct. There are a few different metals which are used for TV aerial and satellite poles/ masts. For a better experience, please enable JavaScript in your browser before proceeding. They seem to be for fairly lightweight TV antenna. plastic plate to bond the coax connectors to an earth cable A long banana shape is fine, in other words if you note say a 5 degree droop, its not a problem. Its also worth mentioning that you could use a 1.5diameter mast below 6 and a 2 below 10. This is very similar to the AWG system. Ham Radio Aerials. by MrWeetabix 17 May 2012, 17:21, Post 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. Inc info on copper vs fibre and speeds. 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. by wheel bender 17 May 2012, 15:15, Post nailed to the fence rails to form a horizontal cable trough. The steel The tow rope will just find its equilibrium. Personally, I prefer a mast and swivel bracket for loft installations but I can see why these may have some appeal. The patch panel is a standard SQ series wall plate with I would rather lose a foot or two and concrete the pole into the ground than put something that big on a shed! Now you are ready to lift two sections vertically. The lower guy pointdidnt need any drilling and tapping, it just sits on the scaffold connector. copper earth conductor which is designed to withstand 10KA for 0.1s. (The ladder is normally stored in the shed to minute. ohms. My Name is Conor, I am a liar who forgot I came from 11m SSB. One of the coach screws Spent time now to correct the vertical trueness of 8 guy points now and get the feel of the tension required. Your ULTIMATE Guide to free TV in the UKThe "UK's leading" guide to making the most of free TV! Note: Never conduct a shake test on a loose tower, or with the falling derrick disconnected from the connection point, it could collapse. wind survival is limited to limited to about 80Kmph No need to talk any more about this. The mast itself is painted steel so it would be prone to rusting like the satellite dish itself. 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. A short length of cable tray fixed to the fence makes J masts are only suitable for light loads when installed outside. 2m above. Wondered if they're any good or not. Starting with the base hinge, measureout in 90 degree increments, 9 metres to where the guy stake needs to be hammered into the ground. Or It maybe that you want the installation looking as discreet as possible in which case a smaller mast would be required. Please DO NOT CALL OUR TELEPHONE LINES. for tidy cable management. Even then I would try and obtain a aluminium scaffold pole instead. I stock mainly 6 masts personally. dissuade unauthorised climbing.). by wheel bender 18 May 2012, 05:27, Return to CB Radio - General Topics and Discussion, Powered by phpBB Forum Software phpBB Limited, Prosilver Dark Edition by Premium phpBB Styles. Go slowly and check every connection on the tear-down. 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. Of interest, I pushed the limits of this technique and built an 80 foot version. This section should have a guy point ready in the middle of the pole. bore (~50mm OD) galvanised pipe seen here carries a VHF / UHF by jonporthill 16 May 2012, 21:11, Post You will find, due to the way sin and cos works (back to school!) ohms. From the bottom: at the top of the lowerpole, one in the middle of the centre pole and then two for the top section spaced out at 1m from the bottom (3 feet) and same again at the top. This creates a far bigger stand off than the Swan Neck mast. Click below to see all of our DIY guides. (820Hz) at the end of the driest summer in 30 years was 16 1m anchored against the chimney, strapped around it. Then you can take it down for repairs any time you need to. I made the guy points from aluminium plate and had them sit on nylon washers that I cut out. In this article I will discuss many of the common types of masts along with how we difference between them. Just go slow here. installation earth. needed. The discone mast and patch panel are earthed via a 6" welded wall bracket. Mast diameters for TV/ Radio Aerials are commonly available in the following diameters. Your choice of antenna mast will depend on a number of factors such as: Guy wires are most commonly needed for antenna masts which resemble towers (usually of a lattice construction). Reconnect the connection point, call your ham radio on VHF chums and tell them what you just did! then you will see droop. Mast can be purchased in all of the following heights: Plus a few more. Generally, local authorities don't require planning permission for antenna masts which are classified as permitted developments. 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. strap is to protect the earth electrode and wiring from If you're thinking about upgrading to Sky Glass, Sky TV's latest service. mechanical damage. So please be warned. Note the eye and eye To do need a larger mast is needed. I will be getting a 20 ft long scaffold pole to use as a mast for an antenna (not sure what one yet). Steel plates, wood et al could easily detach themselves on a windy day. Ham Radio Antennas Verticals or Dipoles so whats best? This means that the pole has been hot dipped in zinc to help preserve it. Only one more section to go, disconnect the falling derrick from the connection pointandlowerthestructure by pulling on the top guy, opposite the falling derrick. We discussed earlier that tipping point at around 70 degrees or so. at about 2m above the ground (with a pole belt around the antenna May I ask you to wear strong work-wear gloves please? medium size line tap which fits over the earth electrode. Height: Take into account both the extended and retracted height of the mast. by jonporthill 16 May 2012, 20:15, Post ", "The service was excellent and and to be honest the price did not bother me as it was Tom that I felt comfortable with and he done a cracking job.". 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. The base hinge needs to be secured lightly, however there should never be too much lateralpressure on the base, only downward. Actually, the car driver will find the liftquite odd since at the beginning of the lift, quite a lot of forward movement hardly lifts the mast at all but near the end, the slightest motion will cause a disproportionate movement at the top of the mast. Guys are provided to support the mast under strong link welded to the end. by UGLY_BOB 16 May 2012, 20:30, Post 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?) by UGLY_BOB 16 May 2012, 20:56, Post Now lay the falling derrick on the ground. You will find it should stay put. Datamodes, SDR & other Radio Software, Amateur Radio - General Topics and Discussion, Amateur Radio - Digital voice and data, CB Radio - General Topics and Discussion, CB & 11m Multi-Mode Radio Equipment Discussion, CB & 11m Multi-Mode Modification & Repair, Licence Free (PMR446/LPD433/SRD860/2.4GHz ISM/SRD49MHz), Licensed (Commercial & Imported Transceivers), Re: How to fix a 20 ft long scaffold pole. As the zinc coating doesnt coat the inside of the pole as well as the outside these usually rust from the inside out meaning that the mast could actually be in far worse condition than it looks. What is NVIS and why do you need a special aerial? 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. Achieving MASSIVE gain on low bands, Best First Amateur Ham Radio HF Antenna for New Operators. The main two are aluminium and steel. Use a small guy a few metres behind the falling derrick that can keep it uprightregardless of whether the tow rope is taught or not. experimentation; to be able to work comfortably and securely on the antennas So, you will need to release one of the falling derrick side ropes and gently lower the falling derrick to the ground. We usedheavy duty roofing pegs anyway. Read this for all you need to know. It is bonded to the pole using 25 square mm 2020 | Smart AerialsAll Rights Reserved. looks like a poynting one. by jonporthill 16 May 2012, 20:22, Post However, theres no reason that most small teams of keen amateur radio operators cant build this as a project for field day use. Thats it. (820Hz) at the end of the driest summer in 30 years was 8.6 You find lowering the two-section mast is a piece of cake. 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. 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. four N type bulkhead connectors mounted. Too loose, and as you attempt to raise the mast, the will not be enough tension on the falling derrick connector and the mast will appear to banana. demolition hammer. The earth conductors are attached using a The integrated cleat provides a handy point for securing You can also obtain anodized aerial masts but the coating on these is not as good as the galvanised masts. I would definitely advise choosing the 1.25. 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. I did this and it missed me by a whisker. of the building via a steel duct which provides room for T and K wall brackets can be used to help get the spacing around and above obstructions. to be able to install antennas at a height of about 10m for 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. Is a Dipole better than a Cobweb Antenna? How do I decide? Lift the end of falling derrick so that its parallel to the ground and with a team member holding the mast section upright, disconnect the guy rope thats holding this verticalvertical and attach to the falling derrick. This means that when the team member starts to pull the whole tower over, opposite the falling derrick, the forces are spread between two of the guying points rather in one place which can cause the structural integrity to change in one massive banana. Attach 4 first stage guying ropes to the top of thismast section and manually hoist the mast to the vertical position. Earth resistance is usually around 11 ohms. Note: You need to connect a long rope to the bottom connector on thefalling derrick. the post is closed off with a draining cap fabricated from 3mm mild This bracket is fabricated from half of an old scaffold 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). 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. With all hands ready then, you need to release the connection guy and have a team member pull the mastover towards them. If they are a bit long a bit can always be hack-sawed off the bottom of the pole. 3m straight Aerial Mast. 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. A hole 20mm in diameter was drilled through the existing Each of them has their own benefits. Post 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. Now you will need a tow-bar. The mast is easily extended Location Selection on Map of the United Kingdom and Wind Load Determination According to BS EN 199114, TV Aerial & Satellite Dish Pole Alloy Straight 10ft x 1.5" | Toolstation, Virgin Media O2 UK Update Improves TV 360 User Interface, EE and BT Mobile UK Customers Gifted Free Data for Sunday, Virgin Media O2 Parents Form Joint Venture to Build New UK Fibre Network, Mobile Operator Three UK to Close 3G Home Signal Box Service, BT and Openreach Workers Begin Two Day UK Strike TODAY UPDATE1, Cheapest UK 4G and 5G Unlimited Mobile Data Plans Compared - 2022, The 2022 Editors Pick of the UK Best Broadband ISPs for Homes, Solutions for Battery Backup of Fibre Broadband and VoIP Phone, Benchmarking Broadband ISP Speed Testers On a 10Gbps Line, The Top 3 Do's and Don'ts When Broadband ISP Engineers Visit, ISP Choices on Openreach's UK FTTP Broadband Network 2021, USB vs WiFi - Tethering 4G Broadband to a Laptop via Android Phones, How Much Does 1Gbps UK Home Broadband Cost - ISPs Compared, Why Buying Gigabit Broadband Doesn't Always Deliver 1Gbps, Summary of Full Fibre Build Progress Across UK Broadband ISPs, How to Choose an External 4G or 5G Mobile Broadband Antenna, Is UK 5G Mobile Dangerous to Human Health? was driven in less than a minute. Let me explain how I built the one shown in the pictures, then Ill cover the learnings with you later along withmy own dos and donts. 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. discone. More questionable is how thick is the timber of your shed ? Myths, Facts and Fiction. Planning regulations vary from council to council. Connect 4 ropes to this guy point and lay them out to each guy point. Lets begin. electric demolition hammer. The mast is usually fixed to the wall with 2 x split brackets. The pole is equi-potential bonded to the electrical Also, when installing masts higher its important that a thicker diameter poles is used with a thicker wall gauge, otherwise its likely to snap in a strong wind. Once vertical, snap the connection guy in place and observe your handy-work.
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