[Lowfer] LEK frequency change

[Bill Ashlock]

Tod,

>how do the 50' by 50' loops fit into the 45' total wire limitation >that 
>used to be a part of Part 15?

As far as I know the Part 15 regulation has always been "15M total length 
including ground". I interpret "length" to be the 'geometric length' of the 
antenna so the antenna could be a 15M x 15M sheet of copper and be 
compliant. The 15M x 15M loop simply cuts away the center portion (BTW 15m = 
~49.12ft). I think the FCC had the excellent foresight of not being overly 
wordy in defining this requirement in order to eliminate 100s of hours 
haggling over the exact way to cover all antenna types. Looking back, it 
appears this specification has done it's job.  With the incredibly small 
radiation resistance of the loop, or any other antenna having a maximum 
geometric length of 15M, there is minimal chance the 15M vertical can be 
outdone if the vertical is located in a completely open area. And limiting 
the radiation to a reference antenna (the vertical) is, of course, what this 
regulation is all about.

Bill A

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