Software Defined Radio VLOG - Part 1

[NotSoLiberal]

Very nice. This is exactly what I was trying to do. I would love if you have pointers to resources you used going forward in this project.

[gauravpride1985]

Nice work ...I want ot know that what kind of modulation scheme is bieng used here .I hope it will programmed in FPGA .

[ebaychatter0]

is there an off the shell SDR that i can buy at the moment? it'd just occured to me that microcontrollers like the pic now has ADC. Do you think they are more suitable for building SDR than FPGAs?

[G0IFI]

Good for you gal. Nice to see a bench as untidy as mine!

[dolphus333]

How important is it that the four capacitors the mux feeds to are perfectly matched?

[nerdyrcdriver]

wait, the first 10 sec is exactly what I say. But it hasnt been cleared because my parents always rush me to do things that arent my responsibility so I dont have time to clean up. plus I get too excited about the finished project and I forget about cleaning.

[llaven]

love it



[GWOVMR]

great alfa building, long may your iron not be cool!

[JBaloney]

This is so great Jeri! WWV and WWVH taught me so much about propagation, time, timing, determining frequency on a Lafayette Explore-Air regenerative receiver, then a Radio Shack DX-160 and a war Surplus An/-grr5 Sometimes I think every musician should listen to WWV for an hour a night so they know what a second feels like... unless WWVH starts creeping in out of phase because of Auroral flutter or long path.... Thanks Sister!

[EETech]

My Senior project in college was a WWV decoder/display. It was clunky, but worked for the most part.

[tharlowXY]

For a jabber, this packs quite a punch.

[jlamoree]

I understood about 1/4 of that. If you wouldn't mind, would you please record a few hundred more videos like this? Hehe. Thank you Jeri.

[OhMeadhbh]

oh! now that's cool! inspiring, jeri! i know what i'm doing next week.

[josh2531]

Awesome project. I've been wanting to try an SDR project for a long time. It amazes me that people would get upset about this sort of thing.

[jeh14]

NIST has not decided to terminate WWV service yet - but they are asking listeners / users of their broadcast services to fill out a survey - presumably they may end or at least cut back on the broadcast services if need doesn't seem to be apparent. So, everyone who find the service valuable (for, among other things, testing new radio designs!) should participate. YT does not permit links in comments but G for wwv survey site:nist.gov should find it.

[NoWattz]

@jeh14 Thanks for the info. I've used the WWV as a calibration standard for a numbers of years. I'd sure hate to lose it. :(

[enginerdy]

Could you do a quick tutorial on your process? 10/10 is pretty impressive for handmade...

[jeriellsworth]

@enginerdy Good idea. Next time I do a tqfp part I'll video it.

[emdeeeff]

Run the LO out of the FPGA? Wouldn't that have a crapton of phase noise?

Or am I just way out of date with the state of the art? I know dedicated DDSen are fairly good nowadays, but I assumed rolling your own was still fraught with dragons...

[khisanth75]

interesting video Jeri !

[vk2zay]

I just call it a commutative mixer. Very cool Jeri, with the dipole in the back yard we'll have you on the ham bands any day now...

[datacopat]

This looks like rocket science in comparison to my gnuradio USRP N200 ;-)

73s de OE1RFC

[paulpalinkas]

No worries about WWV disappearing. What's going away are the propagation & solar weather reports. Also, cool project!

[paulpalinkas]

No worries about WWV disappearing. What's going away are the propagation & solar weather reports.

[motters2001]

Looks like a cool project.

[bkraz333]

Really? People got upset about seeing these great projects and clear explanations? Maybe they are the same people who endlessly ask about kipkay on the Make youtube channel.

[FlyByPC]

Very cool. I figured there was going to be an FPGA involved somewhere! I hope they keep WWV around; I remember doing a science fair project on MUF (Maximum Useable Frequency) prediction (using MiniMUF software) based on tuning in the various WWV frequencies. It didn't work very well, but I learned a bit about RF propagation. Thanks for sharing -- really enjoying the new channel; it's always fun to be there (even virtually) when a project like this starts to "wake up" and produce cool results!

[w2aew]

Excellent stuff Jeri! There's nothing like the satisfaction that comes from hearing something recognizable from a homebrew receiver! I too remember tuning in WWV late at night on my old Realistic DX-160 to align the offset on the bandspread dial.

[scottrharris]

3253? I bought a ton for $0.39 from Jameco, but I haven't fooled with them yet.

[PhattyMo]

I for one want MORE jabber! :)

[Kevbo4]

I always found the atomic clocks signals out of CO quite soothing.

I would listen to a Jeri numbers station.

[Pruncible]

From what I recall from my AM/FM communications class:

Normal radios generally have a signal of a few kHz bandwidth on a multiple MHz (or higher) carrier. In HW, they eliminate the carrier, then output the signal. Over time, radio receivers have improved about linearly with time.

Software defined radios do minimal filtering in HW, passing the filtering/processing/separatio­n on to software, which harnesses the power of CPUs whose power is growing exponentially with time.

[apauled]

I like this jabber account, compliments the main one nicely (for die-hard fans like me I guess..)

[jeriellsworth]

@apauled Thanks. People got so upset on the other channel when I showed this stuff. Glad people don't mind watching my random blather. :D

[FlyByPC]

@jeriellsworth A practical education in electronics for free? No, I definitely don't "mind" watching at all! 8-)

[thewii552]

@jeriellsworth I like this kind of stuff

[inachu]

@jeriellsworth

I showed a guy your video who has been doing this stuff his entire life and he suggested at your next physical get checked for any ccancer from overdosing from rays and so forth! I hope you are ok.

[300000hp]

use toner transfer method - no exposure problems. each time ideal PCB. ;-)

[jeriellsworth]

@300000hp I'll have to try again. I had bad luck the first few times. Most of the time the photo process works well down to 10/10 mil.

[sonicase]

:)