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On 13 Jan 2005 18:26:55 -0800, "
wrote: I note in Bill's recently posted picture about Emley that he uses tape on his professional installations. No doubt he will tell you what sort it is. Tikkitape. Only black is UV proof. I used to use RS Components tape but the quality was variable. Cable ties aren't good really, but yes you can accomodate the cable under the cusp of the ratchet thingy. Tape is better though. Bill I got a roll of white insulation tape from Halfords for my aerials. It doesn't seem very good stuff though. I easily managed to tear bits off with my nails. I'll see how long it holds. Why white? Thought it would show up less than black. BTW, why is not advisable to thread the co-ax inside the mast? I heard someone say once that it oscilates in the wind if you do that, but what about if either end of the mast are taped up? I've got to admit to doing this when installing an aerial for my mate's girlfriend. She's fussy & wanted the neastest possible install. No complaints so far. Marky P. |
BTW, why is not advisable to thread the co-ax inside the mast?
On a straight mast longer than 1m the cable can slap against the inside of the mast. The noise will go down into the house via the building fabric. The solution is to attach cable ties loosely to the cable at 400mm intervals, leaving the surplus length of the ties in place. This is sptringy enough to hold the cable still inside the mast. Another useful tip from SUPER RIGGER! Bill |
http://www.chelsworth-lodge.nildram....NewAerials.jpg
The chimney brackets are a bit close together and grip less of the pole than is ideal, but they are pretty hefty and feel very solid and secure. The pole grip compromise comes from two things. (1) There isn't that much chimney above the ridge to get wires around. (2) The aim is to get the TV aerial as high as possible to see over Felixstowe docks. The standoff for the FM aerial is also a compromise because the aerial comes with a wall/chimney mount so I had to source additional bits and pieces. However it is the suggested 1.5m away from the main pole, and pointing towards Manningtree. Why are you bothering to mount the FM folded dipole Vertical, is there anything around your area thats worth listening to thats vertical polarisation only then?.... -- Tony Sayer |
If I understand 'wavelength' correctly then a full wave is about 3m, 1/2
wave is about 750cms, 1/4 wave is about 375cms. 300 divided by frequency in use e.g.: 107.9 MHz into 300 is 2.780352 etc metres, thats a full wave.... The arm built onto the dipole gives a maximum spacing from the mast of 200cms which is nearer 1/8 wave. Why bother with it?.. I was previously advised (by someone) that half wave was a good distance to be from the mast. In practice this should or usually will give a 4 to 1 forward gain factor but don't take that as gospel, a lot depends on the length and diameter of the support pole. Also a cheapie dipole will not have a balun which fecks up the pattern a bit more due to cable mismatch... -- Tony Sayer |
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I personally have only used cable ties once on airspaced coax, and after
that experience went back to duct tape which seems to last forever if applied carefully. I note in Bill's recently posted picture about Emley that he uses tape on his professional installations. No doubt he will tell you what sort it is. Tapes fine on domestic installs but pro ones where such as RG214 and LDF4-50 etc are in use, cable ties are more the done thing.... -- Tony Sayer |
BTW, why is not advisable to thread the co-ax inside the mast? I
heard someone say once that it oscilates in the wind if you do that, but what about if either end of the mast are taped up? I've got to admit to doing this when installing an aerial for my mate's girlfriend. She's fussy & wanted the neastest possible install. No complaints so far. Don't do it as in high winds it rattles like bu**ery. Apart from that it strains the cable with the albeit small but unsupported weight.... -- Tony Sayer |
On Fri, 14 Jan 2005 19:14:00 +0000, tony sayer wrote:
I personally have only used cable ties once on airspaced coax, and after that experience went back to duct tape which seems to last forever if applied carefully. I note in Bill's recently posted picture about Emley that he uses tape on his professional installations. No doubt he will tell you what sort it is. Tapes fine on domestic installs but pro ones where such as RG214 and LDF4-50 etc are in use, cable ties are more the done thing.... They are more rigid and cable take the pressure of a cable tie. We are talking about domestic TV coax. Arthur |
In article , Arthur
writes On Fri, 14 Jan 2005 19:14:00 +0000, tony sayer wrote: I personally have only used cable ties once on airspaced coax, and after that experience went back to duct tape which seems to last forever if applied carefully. I note in Bill's recently posted picture about Emley that he uses tape on his professional installations. No doubt he will tell you what sort it is. Tapes fine on domestic installs but pro ones where such as RG214 and LDF4-50 etc are in use, cable ties are more the done thing.... They are more rigid and cable take the pressure of a cable tie. We are talking about domestic TV coax. Thats wot I said:) Wouldn't use cable ties on such as CT100 etc.... -- Tony Sayer |
"tony sayer" wrote in message ... http://www.chelsworth-lodge.nildram....NewAerials.jpg The chimney brackets are a bit close together and grip less of the pole than is ideal, but they are pretty hefty and feel very solid and secure. The pole grip compromise comes from two things. (1) There isn't that much chimney above the ridge to get wires around. (2) The aim is to get the TV aerial as high as possible to see over Felixstowe docks. The standoff for the FM aerial is also a compromise because the aerial comes with a wall/chimney mount so I had to source additional bits and pieces. However it is the suggested 1.5m away from the main pole, and pointing towards Manningtree. Why are you bothering to mount the FM folded dipole Vertical, is there anything around your area thats worth listening to thats vertical polarisation only then?.... Just following the instructions on the box :-) So what is best? Vertical, horizontal, sloping? Not sure what benefit I would get from mounting it in any other orientation unless the signals are e.g. horizontal only. Cheers Dave R |
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