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#11
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COAXRATE
Ah excellent as usual Reg -- thanks. Neat program, just what I was looking for. -- Caveat Lecter "Reg Edwards" wrote in message ... Download program COAXRATE from website below in a few seconds and run immediately. Easy to use. It calculates, amongst other useful things, power loss and temperature rise in solid polyethylene coaxial cable, versus dimensions, RF power input, SWR etc., under various physical conditions. It is at least as accurate as manufacturers' own rating data. It takes into account ambient temperature which almost invariably is ignored. Cable power rating depends on whether it is used at midnight in mid-winter in N.Alaska, or at noon, in mid-summer, in New Mexico. Data in ARRL handbooks is fairly useless. Program COAXRATE. ---- .................................................. ......... Regards from Reg, G4FGQ For Free Radio Design Software go to http://www.btinternet.com/~g4fgq.regp .................................................. ......... ---- Reg, G4FGQ |
#12
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COAXRATE
Ah excellent as usual Reg -- thanks. Neat program, just what I was looking for. -- Caveat Lecter "Reg Edwards" wrote in message ... Download program COAXRATE from website below in a few seconds and run immediately. Easy to use. It calculates, amongst other useful things, power loss and temperature rise in solid polyethylene coaxial cable, versus dimensions, RF power input, SWR etc., under various physical conditions. It is at least as accurate as manufacturers' own rating data. It takes into account ambient temperature which almost invariably is ignored. Cable power rating depends on whether it is used at midnight in mid-winter in N.Alaska, or at noon, in mid-summer, in New Mexico. Data in ARRL handbooks is fairly useless. Program COAXRATE. ---- .................................................. ......... Regards from Reg, G4FGQ For Free Radio Design Software go to http://www.btinternet.com/~g4fgq.regp .................................................. ......... ---- Reg, G4FGQ |
#13
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COAXRATE
Ah excellent as usual Reg -- thanks. Neat program, just what I was looking for. -- Caveat Lecter "Reg Edwards" wrote in message ... Download program COAXRATE from website below in a few seconds and run immediately. Easy to use. It calculates, amongst other useful things, power loss and temperature rise in solid polyethylene coaxial cable, versus dimensions, RF power input, SWR etc., under various physical conditions. It is at least as accurate as manufacturers' own rating data. It takes into account ambient temperature which almost invariably is ignored. Cable power rating depends on whether it is used at midnight in mid-winter in N.Alaska, or at noon, in mid-summer, in New Mexico. Data in ARRL handbooks is fairly useless. Program COAXRATE. ---- .................................................. ......... Regards from Reg, G4FGQ For Free Radio Design Software go to http://www.btinternet.com/~g4fgq.regp .................................................. ......... ---- Reg, G4FGQ |
#14
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"Reg Edwards" wrote in message
... Download program COAXRATE from website below in a few seconds and run immediately. Easy to use. It calculates, amongst other useful things, power loss and temperature rise in solid polyethylene coaxial cable, versus dimensions, RF power input, SWR etc., under various physical conditions. It is at least as accurate as manufacturers' own rating data. It takes into account ambient temperature which almost invariably is ignored. Cable power rating depends on whether it is used at midnight in mid-winter in N.Alaska, or at noon, in mid-summer, in New Mexico. Data in ARRL handbooks is fairly useless. Program COAXRATE. ---- .................................................. ......... Regards from Reg, G4FGQ For Free Radio Design Software go to http://www.btinternet.com/~g4fgq.regp .................................................. ......... ---- Reg, G4FGQ Reg: Thanks from me, also. Pascal, eh? Brings back memories. grin Paul AB0SI |
#15
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"Reg Edwards" wrote in message
... Download program COAXRATE from website below in a few seconds and run immediately. Easy to use. It calculates, amongst other useful things, power loss and temperature rise in solid polyethylene coaxial cable, versus dimensions, RF power input, SWR etc., under various physical conditions. It is at least as accurate as manufacturers' own rating data. It takes into account ambient temperature which almost invariably is ignored. Cable power rating depends on whether it is used at midnight in mid-winter in N.Alaska, or at noon, in mid-summer, in New Mexico. Data in ARRL handbooks is fairly useless. Program COAXRATE. ---- .................................................. ......... Regards from Reg, G4FGQ For Free Radio Design Software go to http://www.btinternet.com/~g4fgq.regp .................................................. ......... ---- Reg, G4FGQ Reg: Thanks from me, also. Pascal, eh? Brings back memories. grin Paul AB0SI |
#16
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"Reg Edwards" wrote in message
... Download program COAXRATE from website below in a few seconds and run immediately. Easy to use. It calculates, amongst other useful things, power loss and temperature rise in solid polyethylene coaxial cable, versus dimensions, RF power input, SWR etc., under various physical conditions. It is at least as accurate as manufacturers' own rating data. It takes into account ambient temperature which almost invariably is ignored. Cable power rating depends on whether it is used at midnight in mid-winter in N.Alaska, or at noon, in mid-summer, in New Mexico. Data in ARRL handbooks is fairly useless. Program COAXRATE. ---- .................................................. ......... Regards from Reg, G4FGQ For Free Radio Design Software go to http://www.btinternet.com/~g4fgq.regp .................................................. ......... ---- Reg, G4FGQ Reg: Thanks from me, also. Pascal, eh? Brings back memories. grin Paul AB0SI |
#17
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Manufacturers' and handbook recommended maximum power ratings for coax, for
amateurs, are based on the MELTING (FAILURE) POINT temperature of polyethylene. Nobody in their right minds would ever run common-or-garden RG-58, for example, at such a high power input. Not even at the North Pole. Within seconds, just to grasp the cable in the palm of the hand, would cause blistering of the skin. In any case, the power dissipated in the cable would not be tolerated by amateurs because of the loss in signal strength. Also, running the cable at such a high temperature severely reduces the life of the PVC outer jacket. It soon becomes brittle and cracks. With time it fails before the coaxial polyethylene insulant. Of course, the high advertised power ratings are advantageous to technically ignorant USA cable sales departments and salesmen. It just looks good in the sales literature. Rest assured, NASA never uses RG-58 at one kilowatt, not even with an SWR of 1-to-1. Their missions last longer than 10 minutes. ;o) ---- Reg, G4FGQ |
#18
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Manufacturers' and handbook recommended maximum power ratings for coax, for
amateurs, are based on the MELTING (FAILURE) POINT temperature of polyethylene. Nobody in their right minds would ever run common-or-garden RG-58, for example, at such a high power input. Not even at the North Pole. Within seconds, just to grasp the cable in the palm of the hand, would cause blistering of the skin. In any case, the power dissipated in the cable would not be tolerated by amateurs because of the loss in signal strength. Also, running the cable at such a high temperature severely reduces the life of the PVC outer jacket. It soon becomes brittle and cracks. With time it fails before the coaxial polyethylene insulant. Of course, the high advertised power ratings are advantageous to technically ignorant USA cable sales departments and salesmen. It just looks good in the sales literature. Rest assured, NASA never uses RG-58 at one kilowatt, not even with an SWR of 1-to-1. Their missions last longer than 10 minutes. ;o) ---- Reg, G4FGQ |
#19
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Manufacturers' and handbook recommended maximum power ratings for coax, for
amateurs, are based on the MELTING (FAILURE) POINT temperature of polyethylene. Nobody in their right minds would ever run common-or-garden RG-58, for example, at such a high power input. Not even at the North Pole. Within seconds, just to grasp the cable in the palm of the hand, would cause blistering of the skin. In any case, the power dissipated in the cable would not be tolerated by amateurs because of the loss in signal strength. Also, running the cable at such a high temperature severely reduces the life of the PVC outer jacket. It soon becomes brittle and cracks. With time it fails before the coaxial polyethylene insulant. Of course, the high advertised power ratings are advantageous to technically ignorant USA cable sales departments and salesmen. It just looks good in the sales literature. Rest assured, NASA never uses RG-58 at one kilowatt, not even with an SWR of 1-to-1. Their missions last longer than 10 minutes. ;o) ---- Reg, G4FGQ |
#20
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Thank you all. for the advice and information. I will go to RG-8 all the
way. I just hated putting that big hole in my plaster wall. Oh well want the power more than the plaster. "flashback" wrote in message ... Does anyone have experience with how much power can be run through rg-58 versus rg-8. I am purchasing an Ameritron al-80B and will be running about 1K out. Can I still get away with RG-58? I will be using 160 thru 40 meters. I have a 200 foot run of RG-8 running to my antenna site, but I hate to feed the dipole with something so heavy as RG-8. thanks in advance for any help W0EZI |
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