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Radio Antenna On Chimney ?
Being a white stick radio operator, I have to find someone to put the
antenna up on the chimney stack for me, but before I do, I need some advice please. Obviously, a small pole needs to be attached to the chimney stack so that the antenna which is a glass fibre aerial weighing 0.9Kg can be fitted just above the stack itself. Neither I nor my neighbour have chimney pots. I would estimate that the pole would be overall about 3 feet long and then the antenna fitted at the top of the pole to clear the stack. Should I use 1 or 2 lashing kits to hold the pole. The pole will be 2" alli scaffold, already obtained, curtousy of the housing refurbishment contractors. I have written consent from my neighbours because the chimney stack belongs to both of us. I asked on another group but advice not forth coming. Kindest regards, Jim |
Radio Antenna On Chimney ?
On 17/07/2010 22:45, the_constructor wrote:
Being a white stick radio operator, I have to find someone to put the antenna up on the chimney stack for me, but before I do, I need some advice please. Obviously, a small pole needs to be attached to the chimney stack so that the antenna which is a glass fibre aerial weighing 0.9Kg can be fitted just above the stack itself. Neither I nor my neighbour have chimney pots. I would estimate that the pole would be overall about 3 feet long and then the antenna fitted at the top of the pole to clear the stack. At this point, I have to ask is the antenna for V/UHF, or HF use? If the latter, I would advise a double lashing kit. Should I use 1 or 2 lashing kits to hold the pole. The pole will be 2" alli scaffold, already obtained, curtousy of the housing refurbishment contractors. Have you gone for the thick walled stuff, or the zip up type? Dave |
Radio Antenna On Chimney ?
In article ,
"the_constructor" writes: Being a white stick radio operator, I have to find someone to put the antenna up on the chimney stack for me, but before I do, I need some advice please. If you get an aerial installer to do it, get the advice from them. Obviously, a small pole needs to be attached to the chimney stack so that the antenna which is a glass fibre aerial weighing 0.9Kg can be fitted just above the stack itself. Neither I nor my neighbour have chimney pots. I would estimate that the pole would be overall about 3 feet long and then the antenna fitted at the top of the pole to clear the stack. Should I use 1 or 2 lashing kits to hold the pole. That seems quite small compared with many TV aerials, although I have no idea what shape, and more importantly, wind resistance the glass fibre aerial has, but providing it's not large, one lashing kit should be fine. The pole will be 2" alli scaffold, already obtained, curtousy of the housing refurbishment contractors. Make sure your brackets will take a 2" mast, as 1.5" is a more common aerial mast size (although 2" masts do exist). -- Andrew Gabriel [email address is not usable -- followup in the newsgroup] |
Radio Antenna On Chimney ?
On 17/07/2010 23:26, Andrew Gabriel wrote:
In articleApidnbxV2O74ud_RnZ2dnUVZ7tmdnZ2d@brightvie w.co.uk, .uk writes: Being a white stick radio operator, I have to find someone to put the antenna up on the chimney stack for me, but before I do, I need some advice please. If you get an aerial installer to do it, get the advice from them. If he is a radio amateur as I am, our aerials demand different mountings than do TV ones. Lightening and static during a storm can take out the front end of a receiver in a flash. Pun intended Obviously, a small pole needs to be attached to the chimney stack so that the antenna which is a glass fibre aerial weighing 0.9Kg can be fitted just above the stack itself. Neither I nor my neighbour have chimney pots. I would estimate that the pole would be overall about 3 feet long and then the antenna fitted at the top of the pole to clear the stack. Should I use 1 or 2 lashing kits to hold the pole. That seems quite small compared with many TV aerials, although I have no idea what shape, and more importantly, wind resistance the glass fibre aerial has, but providing it's not large, one lashing kit should be fine. This is one of the unknowns. For amateurs, wind resistance calculations are well known. A TV aerial installer will have no knowledge of this. Our aerials that work from 50 Meg to 70 centimetres can be quite wide and bulky. Thus giving a much higher wind resistance than expected. Dave |
Radio Antenna On Chimney ?
"Andrew Gabriel" wrote in message ... That seems quite small compared with many TV aerials, although I have no idea what shape, and more importantly, wind resistance the glass fibre aerial has, but providing it's not large, one lashing kit should be fine. I have seen amateur radio aerials on the ground, still attached to the chimney, they can be rather large compared to a TV aerial. |
Radio Antenna On Chimney ?
"the_constructor" wrote in message o.uk... Being a white stick radio operator, I have to find someone to put the antenna up on the chimney stack for me, but before I do, I need some advice please. Obviously, a small pole needs to be attached to the chimney stack so that the antenna which is a glass fibre aerial weighing 0.9Kg can be fitted just above the stack itself. Neither I nor my neighbour have chimney pots. I would estimate that the pole would be overall about 3 feet long and then the antenna fitted at the top of the pole to clear the stack. Should I use 1 or 2 lashing kits to hold the pole. The pole will be 2" alli scaffold, already obtained, curtousy of the housing refurbishment contractors. I have written consent from my neighbours because the chimney stack belongs to both of us. I put up an alloy scaffold pole as a TV aerial pole a few years back. However it was a lot more than 3' long - taller than me so 2-3 metres. I used a couple of very large lashing kits to hold the pole. The aerial is still up there, and well above any others around it. If it is only 3' then one lashing kit might do - although you don't say how long the aerial is. Short and stumpy will exert less lateral pull than a very tall one. If there is any doubt I would use 2 - the cost of a lashing kit will be small compared to the cost of someone going up there and fixing it. HTH Dave R -- No plan survives contact with the enemy. Helmuth von Moltke the Elder |
Radio Antenna On Chimney ?
"dave" wrote in message ... On 17/07/2010 22:45, the_constructor wrote: Being a white stick radio operator, I have to find someone to put the antenna up on the chimney stack for me, but before I do, I need some advice please. Obviously, a small pole needs to be attached to the chimney stack so that the antenna which is a glass fibre aerial weighing 0.9Kg can be fitted just above the stack itself. Neither I nor my neighbour have chimney pots. I would estimate that the pole would be overall about 3 feet long and then the antenna fitted at the top of the pole to clear the stack. At this point, I have to ask is the antenna for V/UHF, or HF use? If the latter, I would advise a double lashing kit. Should I use 1 or 2 lashing kits to hold the pole. The pole will be 2" alli scaffold, already obtained, curtousy of the housing refurbishment contractors. Have you gone for the thick walled stuff, or the zip up type? Dave Yes, I am a licensed radio ham. Jim G1SSO located in County Durham. The bracketry I was thinking of is something like this: http://www.aerialshack.com/inch-chim...ket-p-346.html This is the spec of the antenna: Compact white fibreglass dual-band base antenna for 2m and 70cm. Frequency Bands 2m/70cm Max Power 200W Length 1.7m Radials 3 Gain (2m) 4.5dB Gain (70cm) 7.2dB Weight 0.9kg Type (2m) 3 x 1/4 wave Type (70cm) 3 x 5/8 wave The alli tube that I have is 2" dia and roughly 3/8" wall. As I say, I would imagine all I need is about 3 feet. I was thinking of running a 10mm green earth cable from the mounting brackets down to a ground spike, but someone commented that it may upset the antenna. Also I want a termination box with an N socket attached, on the wall in my shack and to run a similar cable to ground. All comments gratefully received. Jim |
Radio Antenna On Chimney ?
In article ,
the_constructor scribeth thus "dave" wrote in message ... On 17/07/2010 22:45, the_constructor wrote: Being a white stick radio operator, I have to find someone to put the antenna up on the chimney stack for me, but before I do, I need some advice please. Obviously, a small pole needs to be attached to the chimney stack so that the antenna which is a glass fibre aerial weighing 0.9Kg can be fitted just above the stack itself. Neither I nor my neighbour have chimney pots. I would estimate that the pole would be overall about 3 feet long and then the antenna fitted at the top of the pole to clear the stack. At this point, I have to ask is the antenna for V/UHF, or HF use? If the latter, I would advise a double lashing kit. Should I use 1 or 2 lashing kits to hold the pole. The pole will be 2" alli scaffold, already obtained, curtousy of the housing refurbishment contractors. Have you gone for the thick walled stuff, or the zip up type? Dave Yes, I am a licensed radio ham. Jim G1SSO located in County Durham. The bracketry I was thinking of is something like this: http://www.aerialshack.com/inch-chim...ket-p-346.html This is the spec of the antenna: Compact white fibreglass dual-band base antenna for 2m and 70cm. Frequency Bands 2m/70cm Max Power 200W Length 1.7m Radials 3 Gain (2m) 4.5dB Gain (70cm) 7.2dB Weight 0.9kg Type (2m) 3 x 1/4 wave Type (70cm) 3 x 5/8 wave The alli tube that I have is 2" dia and roughly 3/8" wall. As I say, I would imagine all I need is about 3 feet. I was thinking of running a 10mm green earth cable from the mounting brackets down to a ground spike, but someone commented that it may upset the antenna. Also I want a termination box with an N socket attached, on the wall in my shack and to run a similar cable to ground. All comments gratefully received. Jim Thats not that much of a load but its more of a load that I'd feel happy with the bract chosen for what your trying to do!.. Put it on a decent lashing, a competent aerial rigger if you have one round your away can advise. Or if you have one a decent couple of wall brackets on a gable end might be better. It should be able to clamp to a standard 50 mm dia pole we use similar aerials for PMR applications and don't have problems usually they come with their own brackets sometimes we have to supply them but it shouldn't be rocket science. The bit about earthing sounds duff info!, you won't upset the aerial at all at those frequencies. Very very few aerials on domestic premises are earthed with a view to lightning protection, this does require more than a bit of Green earth wire a solid lump of Ally or copper and earthing plates or driven electrodes are required. An "N" type outlet shouldn't be a problem either and earthing that and disconnecting the aerial lead in thundery weather might be better then nothing. If your belted by a direct strike expect that to be vaporised and an insurance claim!. What it will help with is small induced current side swipes.. 73's -- Tony Sayer |
Radio Antenna On Chimney ?
the_constructor wrote:
Being a white stick radio operator, I have to find someone to put the antenna up on the chimney stack for me, but before I do, I need some advice please. Obviously, a small pole needs to be attached to the chimney stack so that the antenna which is a glass fibre aerial weighing 0.9Kg can be fitted just above the stack itself. Neither I nor my neighbour have chimney pots. I would estimate that the pole would be overall about 3 feet long and then the antenna fitted at the top of the pole to clear the stack. Should I use 1 or 2 lashing kits to hold the pole. The pole will be 2" alli scaffold, already obtained, curtousy of the housing refurbishment contractors. I have written consent from my neighbours because the chimney stack belongs to both of us. I asked on another group but advice not forth coming. Kindest regards, Jim Stick a pole in the ground it much easier to take down when you need to put up another type of ariel. The ariel can be 15M from ground level. A tempory wind up / down one can be as high as needed. -- --- zaax Frustration casues accidents: allow faster traffic to overtake. |
Radio Antenna On Chimney ?
"zaax" wrote in message ... the_constructor wrote: Being a white stick radio operator, I have to find someone to put the antenna up on the chimney stack for me, but before I do, I need some advice please. Obviously, a small pole needs to be attached to the chimney stack so that the antenna which is a glass fibre aerial weighing 0.9Kg can be fitted just above the stack itself. Neither I nor my neighbour have chimney pots. I would estimate that the pole would be overall about 3 feet long and then the antenna fitted at the top of the pole to clear the stack. Should I use 1 or 2 lashing kits to hold the pole. The pole will be 2" alli scaffold, already obtained, curtousy of the housing refurbishment contractors. I have written consent from my neighbours because the chimney stack belongs to both of us. I asked on another group but advice not forth coming. Kindest regards, Jim Stick a pole in the ground it much easier to take down when you need to put up another type of ariel. The ariel can be 15M from ground level. A tempory wind up / down one can be as high as needed. -- --- zaax Frustration casues accidents: allow faster traffic to overtake. Many thanks for the suggestion, but unfortunately, this is not an option. Jim |
Radio Antenna On Chimney ?
On 18/07/2010 15:06, the_constructor wrote:
wrote in message ... On 17/07/2010 22:45, the_constructor wrote: Being a white stick radio operator, I have to find someone to put the antenna up on the chimney stack for me, but before I do, I need some advice please. Obviously, a small pole needs to be attached to the chimney stack so that the antenna which is a glass fibre aerial weighing 0.9Kg can be fitted just above the stack itself. Neither I nor my neighbour have chimney pots. I would estimate that the pole would be overall about 3 feet long and then the antenna fitted at the top of the pole to clear the stack. At this point, I have to ask is the antenna for V/UHF, or HF use? If the latter, I would advise a double lashing kit. Should I use 1 or 2 lashing kits to hold the pole. The pole will be 2" alli scaffold, already obtained, curtousy of the housing refurbishment contractors. Have you gone for the thick walled stuff, or the zip up type? Dave Yes, I am a licensed radio ham. Jim G1SSO located in County Durham. The bracketry I was thinking of is something like this: http://www.aerialshack.com/inch-chim...ket-p-346.html I am using the same thing for my tri bander on the corner of the house and it has been up over ten years now without a problem at all. Just popped up to the shack to check on a dual bander that must be very similar to yours and that came with 4 foot 25 mm or one inch diam aluminium pole about 4 foot long. This is the spec of the antenna: Compact white fibreglass dual-band base antenna for 2m and 70cm. Frequency Bands 2m/70cm Max Power 200W Length 1.7m Radials 3 Gain (2m) 4.5dB Gain (70cm) 7.2dB Weight 0.9kg Type (2m) 3 x 1/4 wave Type (70cm) 3 x 5/8 wave Very similar to the one I have in storage. The alli tube that I have is 2" dia and roughly 3/8" wall. As I say, I would imagine all I need is about 3 feet. Or just enough to get the radials above the chimney pot. But this is where length matters ;-) I was thinking of running a 10mm green earth cable from the mounting brackets down to a ground spike, but someone commented that it may upset the antenna. It won't upset the aerial at VHF and above, but it won't do anything to prevent lightening striking either. You will only need an earth for HF. and that is only for ballancing the antenna system. Also I want a termination box with an N socket attached, on the wall in my shack and to run a similar cable to ground. A good choice and make sure you un-plug when there is static (warm dry weather and high winds.) or thunder in the area. I once lost the front end of a UHF rig through that. Dave g6khp |
Radio Antenna On Chimney ?
On 18/07/2010 08:24, dennis@home wrote:
"Andrew Gabriel" wrote in message ... That seems quite small compared with many TV aerials, although I have no idea what shape, and more importantly, wind resistance the glass fibre aerial has, but providing it's not large, one lashing kit should be fine. I have seen amateur radio aerials on the ground, still attached to the chimney, they can be rather large compared to a TV aerial. You didn't declare what the aerial style or size was. Are you saying that you are an expert in this field as well? Dave |
Radio Antenna On Chimney ?
"dave" wrote in message ... On 18/07/2010 08:24, dennis@home wrote: "Andrew Gabriel" wrote in message ... That seems quite small compared with many TV aerials, although I have no idea what shape, and more importantly, wind resistance the glass fibre aerial has, but providing it's not large, one lashing kit should be fine. I have seen amateur radio aerials on the ground, still attached to the chimney, they can be rather large compared to a TV aerial. You didn't declare what the aerial style or size was. Are you saying that you are an expert in this field as well? No one has said how big the aerial is, yet! Lots have advised how to fix said unknown aerial. Are you psychic now? PS I do know a bit about aerials but I wouldn't dream of advising anyone on how to fix an unknown aerial in an unknown location on an unknown chimney, which as you may note I didn't. Dave |
Radio Antenna On Chimney ?
In article ,
the_constructor writes The bracketry I was thinking of is something like this: http://www.aerialshack.com/inch-chim...ket-p-346.html This is the spec of the antenna: Compact white fibreglass dual-band base antenna for 2m and 70cm. Frequency Bands 2m/70cm Max Power 200W Length 1.7m Radials 3 Gain (2m) 4.5dB Gain (70cm) 7.2dB Weight 0.9kg Type (2m) 3 x 1/4 wave Type (70cm) 3 x 5/8 wave The alli tube that I have is 2" dia and roughly 3/8" wall. As I say, I would imagine all I need is about 3 feet. Compared with a moderate TV aerial, that is really quite a light load as far as windage is concerned. I would be happy to use a single lashing kit but would use a 9" bracket instead as that will spread the load over 3 bricks. The style of bracket you chose is fine, I have use the same to good effect. 9" bracket: http://www.aerialshack.com/inch-chim...et-p-1218.html I assume it's galvanised, it looks it, find another if it isn't. -- fred FIVE TV's superbright logo - not the DOG's, it's ******** |
Radio Antenna On Chimney ?
On 18 Jul,
"the_constructor" wrote: Yes, I am a licensed radio ham. Jim G1SSO located in County Durham. I'n not far south of you, about 400 metres out of Co. Durham, G3V.. The bracketry I was thinking of is something like this: http://www.aerialshack.com/inch-chim...ket-p-346.html That's a handy site, I've been looking for 2.5 inch V brackets at a price without exhorbitant postage. I put up a TV aerial on a 10ft pole on T&Ks on my side wall recently. I've been since inundated with marauding crows, whose early morning antics managed to loosen the brackets (mounted with 8mm expanding bolts into bodger Ba**et's finest bricklaying) due to the whip in the (too thin wall) 10' ali pole. I've replaced the expanding bolts with 10mm resin fix ones (in different bricks) and the pole with a 2" dia ali 8' scaffold pole surmounted with a cranked pole for the aerials, to get them away from over the path so they can use the gutter for what birds do over cars. So far this had done the trick, but I had to bodge the u bolts to fit the larger pole. I now have the correct size on order. -- B Thumbs Change lycos to yahoo to reply |
Radio Antenna On Chimney ?
On 18/07/2010 18:34, dennis@home wrote:
"dave" wrote in message ... On 18/07/2010 08:24, dennis@home wrote: "Andrew Gabriel" wrote in message ... That seems quite small compared with many TV aerials, although I have no idea what shape, and more importantly, wind resistance the glass fibre aerial has, but providing it's not large, one lashing kit should be fine. I have seen amateur radio aerials on the ground, still attached to the chimney, they can be rather large compared to a TV aerial. You didn't declare what the aerial style or size was. Are you saying that you are an expert in this field as well? No one has said how big the aerial is, yet! The OP did. Lots have advised how to fix said unknown aerial. It isn't an unknown aerial to anyone who is competent, or familiar with the frequency and specifications. Are you psychic now? PS I do know a bit about aerials but I wouldn't dream of advising anyone on how to fix an unknown aerial No, but... I know the exact aerial he is talking about, having had them for quite a number of years. in an unknown location on an unknown chimney, which as you may note I didn't. I have over 30 years experience of erecting amateur antennas and never once has one been blown down. Dave |
Radio Antenna On Chimney ?
On 18/07/2010 17:43, the_constructor wrote:
wrote in message ... the_constructor wrote: Being a white stick radio operator, I have to find someone to put the antenna up on the chimney stack for me, but before I do, I need some advice please. Obviously, a small pole needs to be attached to the chimney stack so that the antenna which is a glass fibre aerial weighing 0.9Kg can be fitted just above the stack itself. Neither I nor my neighbour have chimney pots. I would estimate that the pole would be overall about 3 feet long and then the antenna fitted at the top of the pole to clear the stack. Should I use 1 or 2 lashing kits to hold the pole. The pole will be 2" alli scaffold, already obtained, curtousy of the housing refurbishment contractors. I have written consent from my neighbours because the chimney stack belongs to both of us. I asked on another group but advice not forth coming. Kindest regards, Jim Stick a pole in the ground it much easier to take down when you need to put up another type of ariel. The ariel can be 15M from ground level. A tempory wind up / down one can be as high as needed. -- --- zaax Frustration casues accidents: allow faster traffic to overtake. Many thanks for the suggestion, but unfortunately, this is not an option. For the obvious reasons that a pole would be subject to much more wind loading, that could result in it coming down in a storm and putting next doors windows through. Dave |
Radio Antenna On Chimney ?
"dave" wrote in message ... On 18/07/2010 18:34, dennis@home wrote: "dave" wrote in message ... On 18/07/2010 08:24, dennis@home wrote: "Andrew Gabriel" wrote in message ... That seems quite small compared with many TV aerials, although I have no idea what shape, and more importantly, wind resistance the glass fibre aerial has, but providing it's not large, one lashing kit should be fine. I have seen amateur radio aerials on the ground, still attached to the chimney, they can be rather large compared to a TV aerial. You didn't declare what the aerial style or size was. Are you saying that you are an expert in this field as well? No one has said how big the aerial is, yet! The OP did. After I replied! Lots have advised how to fix said unknown aerial. It isn't an unknown aerial to anyone who is competent, or familiar with the frequency and specifications. Are you psychic now? PS I do know a bit about aerials but I wouldn't dream of advising anyone on how to fix an unknown aerial No, but... I know the exact aerial he is talking about, having had them for quite a number of years. in an unknown location on an unknown chimney, which as you may note I didn't. I have over 30 years experience of erecting amateur antennas and never once has one been blown down. Well lucky you. How many have you done? Do you want me to send you the addresses of some I have seen blown down so you can go and tell them what they did wrong? |
Radio Antenna On Chimney ?
On 18/07/2010 22:01, dennis@home wrote:
"dave" wrote in message ... On 18/07/2010 18:34, dennis@home wrote: "dave" wrote in message ... On 18/07/2010 08:24, dennis@home wrote: "Andrew Gabriel" wrote in message ... That seems quite small compared with many TV aerials, although I have no idea what shape, and more importantly, wind resistance the glass fibre aerial has, but providing it's not large, one lashing kit should be fine. I have seen amateur radio aerials on the ground, still attached to the chimney, they can be rather large compared to a TV aerial. You didn't declare what the aerial style or size was. Are you saying that you are an expert in this field as well? No one has said how big the aerial is, yet! The OP did. After I replied! Lots have advised how to fix said unknown aerial. It isn't an unknown aerial to anyone who is competent, or familiar with the frequency and specifications. Are you psychic now? PS I do know a bit about aerials but I wouldn't dream of advising anyone on how to fix an unknown aerial No, but... I know the exact aerial he is talking about, having had them for quite a number of years. in an unknown location on an unknown chimney, which as you may note I didn't. I have over 30 years experience of erecting amateur antennas and never once has one been blown down. Well lucky you. How many have you done? I have totally lost count of the numbers, but as a radio amateur, you experiment with antennas very regularly. In the past, I have built as many as 4 in as many days. Do you want me to send you the addresses of some I have seen blown down so you can go and tell them what they did wrong? I don't like to communicate with stupid people. Dave |
Radio Antenna On Chimney ?
dennis@home wrote:
I have seen amateur radio aerials on the ground, still attached to the chimney, they can be rather large compared to a TV aerial. You didn't declare what the aerial style or size was. Are you saying that you are an expert in this field as well? No one has said how big the aerial is, yet! He did Length 1.7m Radials 3 Weight 0.9kg Type (2m) 3 x 1/4 wave Type (70cm) 3 x 5/8 wave PS I do know a bit about aerials LOL |
Radio Antenna On Chimney ?
dave wrote:
On 18/07/2010 17:43, the_constructor wrote: wrote in message ... the_constructor wrote: Being a white stick radio operator, I have to find someone to put the antenna up on the chimney stack for me, but before I do, I need some advice please. Obviously, a small pole needs to be attached to the chimney stack so that the antenna which is a glass fibre aerial weighing 0.9Kg can be fitted just above the stack itself. Neither I nor my neighbour have chimney pots. I would estimate that the pole would be overall about 3 feet long and then the antenna fitted at the top of the pole to clear the stack. Should I use 1 or 2 lashing kits to hold the pole. The pole will be 2" alli scaffold, already obtained, curtousy of the housing refurbishment contractors. I have written consent from my neighbours because the chimney stack belongs to both of us. I asked on another group but advice not forth coming. Kindest regards, Jim Stick a pole in the ground it much easier to take down when you need to put up another type of ariel. The ariel can be 15M from ground level. A tempory wind up / down one can be as high as needed. -- --- zaax Frustration casues accidents: allow faster traffic to overtake. Many thanks for the suggestion, but unfortunately, this is not an option. For the obvious reasons that a pole would be subject to much more wind loading, that could result in it coming down in a storm and putting next doors windows through. Dave How do you work that one out? I would prefure to repair a window rather than a chimney. -- --- zaax Frustration casues accidents: allow faster traffic to overtake. |
Radio Antenna On Chimney ?
"Mark" wrote in message news:djL0o.166692$9c1.99167@hurricane... dennis@home wrote: I have seen amateur radio aerials on the ground, still attached to the chimney, they can be rather large compared to a TV aerial. You didn't declare what the aerial style or size was. Are you saying that you are an expert in this field as well? No one has said how big the aerial is, yet! He did Yes, after I posted. Doesn't anyone in this group know that usenet is an asynchronous mechanism. |
Radio Antenna On Chimney ?
"Huge" wrote in message ... On 2010-07-18, Mark wrote: dennis@home wrote: PS I do know a bit about aerials LOL That would be a first ... How would you know, you appear to know nothing about anything, all you do is assume geoff is correct which is a big mistake on anyone part. I think you, geoff aand drivel are the same person. BTW, I've had a 2m folded dipole on a chimney for ~15 years, using a standard TV lashing kit without any issues (at least relating to the mounting - the UV hasn't been kind to the plastic parts of the aerial.) Well if you go into the car park at the doctors surgery at #6 High Street, West Bromwich you can have a look at the now horizontally polarised vertical whip aerial that's fallen down in the winds. That one is a bit bigger at about 5m in length and still has the guy lines attached. The pole broke before the chimney which is probably the prefered failure mode. A falling aerial does a lot less damage than a falling chimney most of the time. You don't want a pole that will pull the chimney down before breaking which nobody appears to have told the OP. |
Radio Antenna On Chimney ?
On 19/07/2010 01:06, zaax wrote:
dave wrote: On 18/07/2010 17:43, the_constructor wrote: wrote in message ... the_constructor wrote: Being a white stick radio operator, I have to find someone to put the antenna up on the chimney stack for me, but before I do, I need some advice please. Obviously, a small pole needs to be attached to the chimney stack so that the antenna which is a glass fibre aerial weighing 0.9Kg can be fitted just above the stack itself. Neither I nor my neighbour have chimney pots. I would estimate that the pole would be overall about 3 feet long and then the antenna fitted at the top of the pole to clear the stack. Should I use 1 or 2 lashing kits to hold the pole. The pole will be 2" alli scaffold, already obtained, curtousy of the housing refurbishment contractors. I have written consent from my neighbours because the chimney stack belongs to both of us. I asked on another group but advice not forth coming. Kindest regards, Jim Stick a pole in the ground it much easier to take down when you need to put up another type of ariel. The ariel can be 15M from ground level. A tempory wind up / down one can be as high as needed. -- --- zaax Frustration casues accidents: allow faster traffic to overtake. Many thanks for the suggestion, but unfortunately, this is not an option. For the obvious reasons that a pole would be subject to much more wind loading, that could result in it coming down in a storm and putting next doors windows through. Dave How do you work that one out? Because a 15 M pole needs a lot more to secure it to a building than a vertical antenna. I know, as I have had a shorter one bolted to my back wall and it can get quite vocal in high winds. Work out the wind loading a 2 M aerial and again for a 15 M pole and come back with the results. I would prefure to repair a window rather than a chimney. The chimney can be claimed on the house insurance, a 15 M pole could not. Dave |
Radio Antenna On Chimney ?
In message , "dennis@home"
writes "Huge" wrote in message ... On 2010-07-18, Mark wrote: dennis@home wrote: PS I do know a bit about aerials LOL That would be a first ... How would you know, you appear to know nothing about anything, all you do is assume geoff is correct which is a big mistake on anyone part. That's not something which happens on a regular basis other than the fact that we probably agree that you are a total eejit -- geoff |
Radio Antenna On Chimney ?
On 17/07/2010 22:45, the_constructor wrote:
Being a white stick radio operator, I have to find someone to put the antenna up on the chimney stack for me, but before I do, I need some advice please. Obviously, a small pole needs to be attached to the chimney stack so that the antenna which is a glass fibre aerial weighing 0.9Kg can be fitted just above the stack itself. Neither I nor my neighbour have chimney pots. I would estimate that the pole would be overall about 3 feet long and then the antenna fitted at the top of the pole to clear the stack. Should I use 1 or 2 lashing kits to hold the pole. The pole will be 2" alli scaffold, already obtained, curtousy of the housing refurbishment contractors. I have written consent from my neighbours because the chimney stack belongs to both of us. I asked on another group but advice not forth coming. Kindest regards, Please let us/me know how you go on. Many years ago, it was a white stick operator that taught me about microprocessors when IBM first thought about the format of a desk top. He used to wire his computers around Motorola chips at that time using wire wrap techniques. One of the best things he taught me, was never take a step forward, that I couldn't take back. Dave |
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