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Tag Archives: softrock

Arduino Filter Sweeper Update

I’m not going to call it a spectrum analyzer anymore – the way I’ve designed this, it isn’t going to do the same things as a spectrum analyzer.

The main difference is that a spectrum analyzer can operate without a signal generator, this won’t because the signal generator is what is going to tell the Arduino what the frequency is.

I built another shield to stack onto the shield in last week’s post.

There is currently no connection from the DDS to this yet, but that’s one of the only few things left to do on the hardware side.

I also built a filter that will ultimately be the first filter to test. This is for my Softrock 20/30/40 and should pass 7 MHz while filtering 14 MHz.

This will fit in a Radio Shack small plastic enclosure – the plate was leftover from a small dummy load that I glued into the enclosure.

-73-

Category: Arduino, Equipment

Tags: ad9850, Arduino, DDS, filter, softrock

Hamvention SCORE!

Oh crap, that probably sounds bad. Ah well.

So my first find was a key. It’s nice, heavy, and probably has a history, which I added “purchased for $35 by KE8P” to.

I found this. For $165. Like any normal ham that likes to push buttons and turn knobs, I turned it on, just to be greeted with it flashing “LOW VOLTAGE 6.5V”. I figured that was a sign that it probably works.

And when I got it home, I found these in it. Ten Energizer rechargeable batteries.

So I removed the batteries and plugged in a wall wart. I was greeted with “VOLTAGE OK 15V” and something like the display in the picture above. I did check my dummy load, it claims it is around 50 ohms at 1-1.3 SWR. Guess it works!

Also included were these. They are coils to use the analyzer as a dip meter. I didn’t really need these, as I built one (they’re really quite simple). My built version worked quite well for the coax traps on my attic trap dipole.