[Antennas] 1/4 Wavelength Coax

[Ray, W4BYG]

The constant is obtained from the cable manufacturer specs, usually 
close enough, but there can be some variation from those specs.

To be more accurate: by testing a piece of your desired cable using 
simple math, with a Grid Dip Oscillator, or an SWR bridge, or an antenna 
analyzer.
Ray, W4BYG


n 12/26/2015 3:01 PM, wcj9996 at frontier.com wrote:
> Dick:
>
> Nether is correct.
>
> The correct formula is;
>
> (246 / F MHZ) x Velocity Factor =  length in feet
>
>   walt, W7PRB
>
> On 12/26/2015 11:38 AM, Dick Dickinson wrote:
>> I'm attempting to fine tune some coax lengths for phased verticals.
>>
>> In searching the internet, I find two formulas used to determine a 1/4
>> wavelength of coax.
>>
>>     234 / Frequency x Velocity Factor, and
>>     246 / Frequency x Velocity Factor
>>
>>
>> What constant is correct for coax lengths?
>>
>>
>> 73,
>> Dick - KA5KKT
>>
>>
>>
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>


-- 
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