Actually, the loss in db doesn't change with swr.  The big difference is 
that if you have a high swr on ladder line, it can and does radiate and 
become part of the antenna as it isn't shielded.  Although you don't 
want swr on your feed line, if you stop and think about it, that is what 
makes antennas radiate.  On a quarter wave each side of feed point, or a 
half wave dipole, you have current high and voltage low ad the feed 
point.  On the ends, it is just the opposite, low current and very high 
rf voltage.  That is why you can put a burned out florescent bulb on the 
end of the wire and it will light up on voice peaks.

73
Butch Bussen
wa0vjr
open Node 3148
Las Vegas


On Thu, 22 Jul 2010, 
Michael Thurman wrote:

> don't forget any loss figures are multiplied at higher swr beacuse when =
> you have reflected power the signal has to travel back and forth o the =
> coax before its radiated  thats why windw r ladder line is so grat it's =
> loss even at high swr is almost nothing :)
> 73 kb7nla
> On Jul 20, 2010, at 7:01 PM, John Miller wrote:
>
>> If you have any power above and beyond the radio at all, rg-58 will =
> bite you=20
>> bad. It can't handle it, I don't like to use it for anything if I can =
> help=20
>> it but would never put more than 100 watts through it.
>> ----- Original Message -----=20
>> From: "Bob Heiser" <[log in to unmask]>
>> To: <[log in to unmask]>
>> Sent: Tuesday, July 20, 2010 11:17 AM
>> Subject: Re: Need some input on HF wire antennas for the Michigan =
> house
>> =20
>> =20
>>> Hello Tom,
>>> On 40 and 80 meters you could use R G 58u and above 40 you might want =
> to=20
>>> use
>>> R G 8 U.
>>> Bob Heiser
>>> K9BOB
>>> ----- Original Message -----=20
>>> From: "tom behler" <[log in to unmask]>
>>> To: <[log in to unmask]>
>>> Sent: Tuesday, July 20, 2010 10:11 AM
>>> Subject: Re: Need some input on HF wire antennas for the Michigan =
> house
>>> =20
>>> =20
>>>>   Wonder what the comparison would be for RG8X?
>>>> =20
>>>> 73 from Tom Behler:  KB8TYJ
>>>> =20
>>>> ----- Original Message -----=20
>>>> From: "Howard Kaufman" <[log in to unmask]>
>>>> To: <[log in to unmask]>
>>>> Sent: Tuesday, July 20, 2010 4:38 AM
>>>> Subject: Fw: Need some input on HF wire antennas for the Michigan =
> house
>>>> =20
>>>> =20
>>>> I forwarded the feedline comparison page to a friend of mine.  I =
> have no
>>>> idea if it is speech friendly, but here are the surprising results =
> of his
>>>> test data.
>>>> =20
>>>> I put the first Wireman ladderline in.  100 feet.  SWR 10 to 1.  =
> Power=20
>>>> 100
>>>>> watts.  Frequency 30 megahertz.  Loss is 1.33 dB.  74 watts is =
> still
>>>>> radiated.
>>>>> =20
>>>>> Then I put in Belden RG 58.  Same parameters otherwise.  Loss is =
> 5.5 dB.
>>>>> 29
>>>>> watts radiated on 10 meters.
>>>>> =20
>>>>> Is coax that more convenient than ladder line???
>>>>> =20
>>>>> Thanks for the reference.=20
>
>