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In my previous post I suggested that the power of the noise is proportional to bandwidth. 100x the bandwidth gives 100x the noise power, so a 20dB rise in the noise floor. Erik's post agrees with that

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Jerry, Noise level is bandwidth dependent. Noise represents a certain energy and the amount of energy you get into your energy level detector depends on the bandwidth of the signal allowed to enter

Dave, Thanks for the report, very interesting!? A lot going on here. Had to think about this for a day or two before coming up with an intelligent response. I'm looking forward to playing with some

Keep in mind, that rant is coming from a retired hardware oriented guy. I'm well aware many are happily coding in C++, some on huge projects where some auto-commenting scheme might well help them

Hmmm, Visual C/C++ code needs to be auto-commented with boilerplate so you can figure out what the code is doing? One of the reasons I prefer straight up K&R C. My apologies for the snark, but I am

I don't have this DSP stuff figured out much either. But about a year ago, got through half of this intro to DSP from Steven W. Smith, found it very accessible: http://www.dspguide.com/pdfbook.htm

One word of warning in changing AGC and LNA settings. Make sure you test both low level signals (noise floor related) and strong signals, preferable in a two tone setup to confirm you do not

Noise level is directly related to bandwidth. The narrower the bandwidth, the lower the noise floor. -- HBTE Files section: /g/HBTE/files Erik, PD0EK

Thanks Jerry for the heads up on Register x69.? I spent a happy evening last night playing with the various options here, and also investigating the effect of time from making a change in frequency

Correction, should read: but if tinySA.exe does NOT terminate with each command with a '\n' then my code won't work with it.

Having said I fixed the compile bugs, guess I should post it. Version tinySArpi01 is now found here: /g/HBTE/files/KE7ER I have not yet tried it out on Si4432 hardware. One thing I

My code will be easier to follow, as much cruft has been removed. But there aren't all that many notes yet, and they are mostly about how I thought a? command line interface should work.? Erik's

Awesome!? Thanks for sharing!? Reminds me too that I need to read into the what looks like a new (or at least to me) commenting scheme in Visual C#/C++ 2010 Express to auto comment sections of code

Dear colleagues, In a few days I will draw a schematic diagram starting from what has been presented so far. I've planned time for work. For pc board I want to choose a scalable solution so that

I will update the build instructions including the saw filter matching circuit. -- HBTE Files section: /g/HBTE/files Erik, PD0EK

Daniel, You were trying to make a PCB to mount ready made modules?? I think I remember an older post. I thought about that and yes, the mixers have a 90degree problem.. I opened the shield on my

Daniel, The closest to "final" is Erik's build instructions of Jan 17: /g/HBTE/files/Tiny%20Spectrum%20Analyzer Note that he is using a Protoneer Arduino Nano board, and recommends a

Gary and colleagues, I tried to put the two SIs in a PCB, the SAW filters and the 5V / 3.3V power sources together with the shields and 50ohm lines. I stopped because a combination seems to appear:

We should be able to see that 120dB range if feeding the SA a sine wave. I see nothing in the datasheet suggesting not. With a whole spectrum of signals that are as strong or stronger than the signal