How much power for coax?
 

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

"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


At 10 MHz, the power rating for RG-58 (Polyethylene Dielectric) is 730w and
for RG-8 it is 3700w). For foam dielectric, use something like 50% of the
above. Note that RG-8x is rated at 1000w at this frequency.

Data from http://www.nemal.com/Catalog/30.pdf

Paul AB0SI

"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


At 10 MHz, the power rating for RG-58 (Polyethylene Dielectric) is 730w and
for RG-8 it is 3700w). For foam dielectric, use something like 50% of the
above. Note that RG-8x is rated at 1000w at this frequency.

Data from http://www.nemal.com/Catalog/30.pdf

Paul AB0SI

"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


At 10 MHz, the power rating for RG-58 (Polyethylene Dielectric) is 730w and
for RG-8 it is 3700w). For foam dielectric, use something like 50% of the
above. Note that RG-8x is rated at 1000w at this frequency.

Data from http://www.nemal.com/Catalog/30.pdf

Paul AB0SI

Also I understand that coax power handling capabilities should be de-rated
as the SWR goes up.
Any one have a formula for this ?
--
Caveat Lecter



"pfriedmanNoSpam" wrote in message
...
"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


At 10 MHz, the power rating for RG-58 (Polyethylene Dielectric) is 730w
and for RG-8 it is 3700w). For foam dielectric, use something like 50% of
the above. Note that RG-8x is rated at 1000w at this frequency.

Data from http://www.nemal.com/Catalog/30.pdf

Paul AB0SI

Also I understand that coax power handling capabilities should be de-rated
as the SWR goes up.
Any one have a formula for this ?
--
Caveat Lecter



"pfriedmanNoSpam" wrote in message
...
"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


At 10 MHz, the power rating for RG-58 (Polyethylene Dielectric) is 730w
and for RG-8 it is 3700w). For foam dielectric, use something like 50% of
the above. Note that RG-8x is rated at 1000w at this frequency.

Data from http://www.nemal.com/Catalog/30.pdf

Paul AB0SI

Also I understand that coax power handling capabilities should be de-rated
as the SWR goes up.
Any one have a formula for this ?
--
Caveat Lecter



"pfriedmanNoSpam" wrote in message
...
"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


At 10 MHz, the power rating for RG-58 (Polyethylene Dielectric) is 730w
and for RG-8 it is 3700w). For foam dielectric, use something like 50% of
the above. Note that RG-8x is rated at 1000w at this frequency.

Data from http://www.nemal.com/Catalog/30.pdf

Paul AB0SI

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

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

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

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

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

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

"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

"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

"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

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

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

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

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

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

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