[HBQRP] HBQRP meeting ideas and group project ideas for 2014

[Ray McNally]

Dar,

  Great questions.

  This basically is a type of spectrum analyzer (no flames, I know it is
not a real spectrum analyzer), the DDS will sweep thru 30 MHz.  Simply, a
signal is generated, passed to the input of the device under test (DUT),
then the results from the output of the DUT
 are measured and can be displayed.

  So, what can this be used for (within the frequency range)?  This can
show if the low pass filter you are building will reduce the harmonics as
intended.  This can be used to show how good a small signal amplifier
really works.  With a directional coupler, you can sweep your antenna and
show graphically how it resonates.

  These are just a couple of uses I can think of right now.  So if we are
building radio kits, for  50 to 75 dollars and a laptop computer, we can
have a very useful test equipment.  With the DDS and Arduino/RaspberryPi,
already discussed, this project would fit right in.  I think this could be
used rather frequently for an avid builder.

73 and Happy Holidays,
Ray - N5SEZ


On Mon, Dec 16, 2013 at 11:05 PM, <w9hzc at cox.net> wrote:

> What, Exactly would you use this for and would you use it often?
> Dar...
>
> ---- Ray McNally <raymcn at gmail.com> wrote:
> > Here is a thought...
> >
> >   There was discussion about using Arduinos and DDS signal sources during
> > the meeting and should be LOTS of fun.
> >
> >   George N2APB runs a "Chat with the Designers" on Tuesday evenings.
>  Last
> > Tuesdays discussion happened to have another application for the Arduino
> > and DDS boards.  Just another suggestion for a potential project.  This
> is
> > refered to the
> >
> >        "Poor Ham's Scalar Network Analyzer"
> >
> >    Here is the link to the Whiteboard discussion
> >       http://www.cwtd.org/Dec10-2013.html
> >
> >   There is a link to a downloadable mp3 audio towards the top.
> >
> >   The Yahoo group for this is PHSNA and it sounds like there may be
> another
> > run on the other boards that would be needed.  Looking at the history in
> > the group, looks like the first round price on the boards was less than
> > $10.00.  No guarantee on what the next round price may be, but I think I
> > will be getting some to work with.
> >
> >   OK, enough with my ramblings, just trying to plant some seeds and see
> > what happens this next kit-building season...
> >
> > Happy Holidays,
> > Ray - N5SEZ
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> --
> Dar W9HZC
>