--- In ultralightdx@..., D1028Gary@... wrote:
>
> Hi Scott,
>
> Thanks for the link to the US Patent reference, and I'll certainly read it
> over.
>
> If I was a businessman I'd certainly be very thankful for this "debate"--
> demand for the 7.5" loopstick PL-380's seems to be going through the roof
> :-)
>
> 73, Gary
>
>
> In a message dated 1/23/2010 11:01:34 P.M. Pacific Standard Time,
> sdwillingham@... writes:
>
>
>
>
> --- In ultralightdx@ In ultra--- In ultralightdx@jkearman@ quotes
> me:
> > "First, the AM front-end of the Si4734 is a tuned-tank circuit with a
> > fairly conventional LNA and quadrature mixer as shown in the block
> > diagram....
> >
> > "As Roy has pointed out, the loopstick (or air-loop) inductance is
> > resonated with an on-chip varactor, which tunes in small discrete steps.
> > This tuning is done each time the frequency is changed."
>
>
>
>
> Gentlemen,
>
>
> Radio reception and antennas involve complex, multidimensional tradeoffs,
> so I'm not taking sides (yet, anyway) in this debate. I do agree with
> Jim that a necessary first step to resolving the disagreement is to
> carefully understand loopstick resonance and how the Silabs' tuning
> method differs fro m that implemented in all other radios.
>
>
> For the techies in the group who are interested, I think this can
> answer most of your questions: _US Patent 7561865_
> (http://www.google.com/patents/about?id=zCLIAAAAEBAJ&dq=7,561,865) .
>
>
> Cheers,
> Scott
>