[hpsdr] Hpsdr Digest, Vol 24, Issue 19

[John Miles]

I wouldn't be quite *that* certain on that point.  I've played with quite a
few commercial TCXOs and OCXOs since upgrading my PN workstation, and there
is a wide variation in quality among them.  I suspect it's quite possible to
build a noisy oscillator, even with a great crystal.

I'd be really interested in testing some prototypes built using the
principles in Chris's VLNO.pdf paper, especially if someone has two of them
that can be locked in quadrature with each other with a varicap.  I can
'see' down to -160 dBc/Hz or so with reasonable confidence, depending on the
offset.

-- john, KE5FX

> -----Original Message-----
> From: hpsdr-bounces at lists.hpsdr.org
> [mailto:hpsdr-bounces at lists.hpsdr.org]On Behalf Of Chris Bartram
> Sent: Thursday, February 21, 2008 5:16 PM
> To: hpsdr at lists.hpsdr.org
> Subject: Re: [hpsdr] Hpsdr Digest, Vol 24, Issue 19
>
>
> ***** High Performance Software Defined Radio Discussion List *****
>
> Phil
>
> > Of course, the problem is generating a 160 or 180 MHz low noise clock.
>
> There are no real problems generating low-noise clocks in the VHF
> region...
> The limits are mainly set by the quality of crystals available at
> realistic
> prices. For the uWSDR programme, I'm currently looking at how to do it
> economically at 1GHz, with an eye on >2GHz for future DDSes...
>


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