RTL-SDR With Upconverter and Case

I just realized that I made a mistake in my filter circuit: I used a 330Ω resistor where I should have used a 33Ω one. That means my cutoff frequency is roughly 500 KHz instead of 5 MHz as I had intended. It still works, though it might work better with the correct component. I plan on finding out, and I will document the process as much as is reasonable.

I plan on adding multiple low-pass and band-pass filters that can be switched in and out of the circuit as needed. I get the feeling that this is going to involve a fair amount of calculating, testing, and hair-pulling.

Thanks to the unexpected interest in this project, I am starting to put together plans to rebuild the entire device into a better enclosure of my own design. While I am at it, I plan on adding a proper USB connector, relocating the switch, and replacing the rough bits with better bits.

I'm also thinking about adding a filter network that will allow for various passbands to be switched in and out. I'll have to do some experimenting there, as filter design is not one of my strong points.

At the suggestion of a fellow ham and HAD member, I will take some before and after measurements. I have a trick up my sleeve in the form of a Singer CSM-1 service monitor. For those who are curious, it is a signal generator (among other things) that allows me to generate signals at precise power levels at up to 550 MHz.

Thanks again to all who have followed and skulled this project. It was entirely unexpected, but very gratifying.

I must say that I was a bit blown away to see my SDR project show up on the front page of Hack A Day! My thanks go out to the good folks at this site who felt my humble little project was worthy of such an honor, and to the folks who have found the project interesting enough to follow or Skull!

I just wish I had done a nicer job of it.