Re: [amsat-bb] Re: Potato Masher question

[Clifford Buttschardt <cbuttsch@xxxxxxxxxx>]

I am very glad to see this correction as I was really wondering and
searching for what I thought was a error.  In addition, I wanted to run an
experiment in which the basic TPM antenna was to be built with a
crossed director added.  The idea here was to vary the spacing to the
loops in such a fashion to bring the impedance down to fifty ohms.  Just
an idea!  Cliff  K7RR

On Sun, 21 Feb 1999 K5OE@aol.com wrote:

> n4sl@yahoo.com writes:
> 
> > Going thru your article on the Potato Masher in the Amsat Journal, I'm
> >  confused by one of the numbers in Table One. Your 'test cable' for
> >  tuning the VSWR with one loop only is 1/2 wave at 146MHz but isn't
> >  15-3/16" a quarter wave? I'm not trying to nit-pick here (like the
> >  hundred other guys who WILL if this is a type-o), I'm trying to make
> >  sure I understand what I'm doing before I do it!
> 
> Right on, Steve!  Both of the test cable lengths in Table 1 are in error.  The
> correct dimensions are exactly double those:  20-3/8"  and 30-3/8"  give or
> take a little depending on your particular coax.  As I noted before, if you
> are just measuring SWR, AND your SWR bridge is accurate, you don't need to do
> this step.  If you are reading impedance, though, with an Autek or MFJ
> analyzer, you definitely want to follow this step.
> 
> A thousand pardons, please.........
> 73, Jerry
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