[hpsdr] Fwd: Horton Local Oscillator

[Ahti Aintila]

Hi Phil & Phil and All,

Please, don't stop this fruitful brainstorming!
Here are my 2 eurocents.

On 17/06/06, Philip Covington <p.covington at gmail.com> wrote:
> ***** High Performance Software Defined Radio Discussion List *****
> On 6/17/06, Don AE5K <don at ae5k.us> wrote:
> > > <Posted on behalf of Phil VK6APH>
< http://216.92.71.47/HPSDR/TEMP_STUFF/Horton%20Local%20Oscillator.doc >

> > For discussion purposes it is assumed that the steps will be 10kHz and
> > that interpolation within these steps will be done in PowerSDR.
> >
> > Maybe this is a naive question, but are we limiting "Horton" to
> > receiving only HF ham bands?

Phil_C answers:
> Horton will not be ham band only.  I do not intend Horton to have its
> own LO on board.  The coverage will be determined by what/which LO is
> driving Horton's QSD.
> That means Horton can be driven by a DDS, PLL, Signal Generator,
> Crystal or whatever. The "whatever" is external to Horton.

"Further thoughts" of Phil_H indicate that it is better to use narrow
bands for voltage control of the oscillator and switch capacitors for
those many bands needed to cover outside the ham band frequencies,
too. It is obvious that a combination of switched capacitors will be
needed. Without any calculations I assume that 16 bits can combine
capacitance values needed at least for the whole HF spectrum.

It may be true that this innovation, by eliminating the need of DDS
solutions, will change a lot of the future radio architecture. Isn't
that what we all want with this exercise?

73, Ahti OH2RZ
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