AMRAD suggested microcontroller projects

[Jeff Scaparra]

Two projects that I want to work on that I would find interesting are:

Using Rasp PI/Arduino to control a stepper motor for remotely tuning a
small magnetic antenna so that after calibration it could use information
from the radio to always be in tune with no user intervention. This would
mitigate the number one problem of using a small transmitting loop. That is
small bandwidth and the constant need to adjust tuning. I don't believe
this is super novel but I am interested in it none the less.

I want to build a switching station that can switch all of my radios (and
future radios) with filter banks, preamps, other radios and antennas. I got
this idea over the last weekend durring the Armed Forces MARS/HAM test
thing. For the digital work I had my antenna fed into a mini-curcuits
pre-amp which fed the rx side of a USRP with the LFRX daughter board. From
there I took 1 MHz of complex IQ samples to my computer where I displayed
an FFT and waterfall, recorded to disk for replay and analysis later, and
finally sent the samples back out to the TX side of the USRP
for transmitting  That then went to my KX3 so that I could use that radio
to tune around the band (within that 1 MHz on 40 meters) and hear what was
going on. It was very neat but I had no way to transmit with this set up.
The ability to switch all of these things on the fly quickly with a
computer controlled interface would be amazing.

73 Jeff N6SDR


On Mon, May 13, 2013 at 3:13 PM, Karl W4KRL <W4KRL at arrl.net> wrote:

> Tacoistas,****
>
> ** **
>
> I just posted a list of possible Arduino or other microcontroller projects
> to the AMRAD website. Please send me your suggestions to add to the list
> and any details about microcontroller projects you are working on.****
>
> ** **
>
> http://amrad.org/projects/sbc/?updated****
>
> ** **
>
> 73 Karl W4KRL****
>
> ** **
>
> ** **
>
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