[Amps] Line Sections As Plate Lines

[jeff millar]

Any coincidence between 1/4 wave in free space and the actual length of 
the 1/2 wave line is purely an accident of the numbers. The line is best 
modeled as an inductor to with caps at each end that resonants at 144 
MHz. A line less than 1/4 wave long appears as an inductance that 
depends on its length and impedance.

jeff, wa1hco

craxd wrote:

> John,
> I read that and your correct, 53 cm is 20.86614173". I'm thinking they 
> may have just rounded off the number to that, I'm not sure. It's very 
> likely that's what they done as it happens a lot when folks are to 
> lazy to type the whole number length.
>
> From the website, the dimensions was, quote;
>
> "The plate line is a 55mm dia. copper tube 53cm long, from bottom of 
> cooler to top of line."
>
> Best & 73's
>
> Will Matney
>
>
>
> JMLTINC at aol.com wrote:
>
>> Hi Will-
>>
>> Yep, just checked it, PA3CSG's site is down.
>>
>> There is another pix at http://www.nd2x.net/PA3CSG-2.html
>>
>> Sorry for the confusion, the 3/10" is the difference between the 
>> actual length of the line (20.8") and 1/4wl (20.5" at 144MHz). That 
>> is to say the line is 3/10" longer than a true 1/4wl line. How does a 
>> line that is 3/10" longer than 1/4wl line become a 1/2wl line?
>>
>> Thanks-
>> John, N9RF
>>
>>
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>
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