[TowerTalk] How to calculate aluminium transmission line impedance?

[Joe Subich, W4TV]

Is there a similar calculator for "angle" conductors - e.g. the
"half a square" conductors used in some commercial antennas?

Viewed from one end, they might be an 1/2" or 3/4" "L" with
the top/bottom laying across the multiple driven elements and
the sides forming a parallel plate line spaced 1/4" to 1/2".

73,

    ... Joe, W4TV


On 2022-10-09 10:49 PM, Richard (Rick) Karlquist wrote:
> See:
> 
> https://hamwaves.com/zc.square/en/
> 
> Running this gives a value of about 115 ohms.
> 
> The fact that it is aluminum doesn't affect Zo
> 
> 73
> Rick N6RK
> 
> On 10/9/2022 7:17 PM, Tonno Vahk wrote:
>> Hi,
>>
>> I have EZNEC model of a tribander with one feedpoint where 10-15-20m 
>> elements are joined with a transmission line of 20mm x 20mm aluminium 
>> profiles, the gap between the profiles is 15mm.
>>
>> For the model I need to know the impedance of the transmission line.
>>
>> EZNEC provides a tool to calculate it from the wire diameter and 
>> spacing. Is there any correction that should be applied with square 
>> aluminium bars? How to calculate the correct impedance in this case?
>>
>> In ENZEC model I have Length = Actual Distance, VF = 1. And the only 
>> thing missing is the Zo I believe.
>>
>> Look, forward to learn how this is calculated:)
>>
>>
>> 73
>> Tonno
>> ES5TV
>>