[hpsdr] New Mac Utility

[Phil Harman]

Hi Jeremy,

Thanks for the information regarding your signal generator project.  Since
Penny and Mercury will run in full duplex what would be really nice would
be to use Penny as a tracking generator with Mercury as a spectrum
analyser.

That way you could sweep filters etc and, with a bridge, do SWR
measurements etc over the range 0-65MHz.

73 Phil...VK6APH





> ***** High Performance Software Defined Radio Discussion List *****
>
> I have this D-STAR repeater project that I've been working on all summer,
> and one of the tasks that I have left to do is align the Tait T855-10
> receiver module in the repeater.  I waited a while trying to figure out
> where to get my hands on a service monitor to do the tests, and eventually
> one of my friends loaned me one at the MicroHams conference last week in
> Seattle.  I was a little disappointed to find out that not only did I need
> the service monitor, but also a signal generator that would go up to 45MHz
> as well.
>
> I looked on eBay at HP and Fluke function generators and wept a little at
> the prices they wanted, and considered that it would be very unlikely that
> I'd receive one before I had to return the service monitor this weekend at
> DCC.  I also noticed some cheap Chinese arbitrary function generators that
> plugged into the USB port of your computer and wondered how good or bad
> they were for $150 or so.  It was then that I realized that I had an
> arbitrary function generator already sitting on my desk.  It's called
> Penelope, and I have some experience with programming it.
>
> I did some hacking around tonight, and some soliciting of sage-like advice
> from Phil (thanks as always for your expertise) and have come up with a
> new utility program for the Macheads out there.  Waverider is a sine wave
> generator for the OpenHPSDR hardware that will generate a sine wave
> consistent with the capabilities of Penelope.  I'm measuring maximum
> output at around 17.5 dBm (1.6V) on the service monitor, and you should be
> able to go to the 65MHz capability of Penny.
>
> There are a few limitations on the program.  It's not calibrated in any
> way, shape, or form.  I tried to get the numbers at least in the ballpark
> of dBm, but there's obviously either some problems with my math, or some
> issues with the penelope hardware's samples not correlating to what I
> expect them to.  It also supports only sine waves right now.  If I get to
> thinking about it, it might be cool to do square and sawtooth waves as
> well.
>
> Waverider is available from:
>
> http://www.nh6z.net/MacHPSDR/Waverider.zip
>
> YMMV, As-Is, standard disclaimers apply.
>
> Source is available in my SVN repository at:
>
> https://www.xenotropic.com/ham-svn/Waverider
>
> --
> Jeremy McDermond (NH6Z)
> Xenotropic Systems
> mcdermj at xenotropic.com
>
>
>
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