[Antennas] 600 Ohm Ladder Line

Sat, 09 Nov 2002 13:01:44 +0000

Thanks Bob! "rolling my own" 600 ohm stub from nichrome wire seems to be the 
only practical solution for weather proof 500watt termination for a large 
Rhombic. Any suggetions/ideas would be greatly appreciated!

             Durwydd MacTara

>From: Bob Stein <[email protected]>
>To: Durwydd MacTara <[email protected]>
>CC: [email protected]
>Subject: Re: [Antennas] 600 Ohm Ladder Line
>Date: Fri, 08 Nov 2002 20:57:28 -0800
>
>Durwydd MacTara wrote:
>>I need the necessary formula(e) to make some 600 ohm ladder line. This 
>>stuff is almost impossible to find in todays market!  Also need to make 
>>some from resistance wire for a 500W termination for a non resonant 
>>Rhombic.
>>
>>             Durwydd MacTara
>>
>>
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>For open-air line:
>Z=276[log(2D/d)]
>where Z=characteristic impedance in ohms
>       D=spacing between wires
>       d=wire diameter
>and D and d are in the same units (inches or cm or mm)
>
>Bob, W6NBI

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