[hpsdr] Horton Local Oscillator discussion paper

[Philip Covington]

On 7/7/06, Phil Harman <pvharman at arach.net.au> wrote:
> ***** High Performance Software Defined Radio Discussion List *****
>
>
>
> I've put together a few notes on a potential local oscillator for the Horton
> board. This uses a microwave VCO divided down to the frequency band of
> intereset.  Assuming the dividers don't degrade the phase noise too much
> this should give very good performance.
>
> Since we can fine tune the receive frequency in PowerSDR we can live with
> say 10kHz steps in the local oscillator.  Since the main VCO tunes in 800kHz
> steps we don't need to use a fractional N synthesiser and we can use a
> relatively wide loop bandwidth.
>
> Some  experimentation is already going on see if one of the 'canned' 2.4GHz
> VCOs will be suitable. If anyone has experience in building 2.4GHz VCOs that
> will cover about 120MHz then please step forward!
>
> Comments, ideas and suggestions welcome.
>
> The paper is attached and at
>
> < http://www.hamsdr.com/personaldirectory.aspx?id=356 >
>
> 73's Phil...VK6APH

Hi Phil,

I got the samples of the NB7N017M part and I also found the
Minicircuits ROS-2750 VCO.  I need to dig around a bit to find my
LMX25xx parts I have stashed somewhere.

73 de Phil N8VB

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