WWV Receiver 

***** Thank you! And you're quite welcome. I really enjoy your videos.

Thank you for the kind words! I've also used the term "swizzle stick" for the little straw in a mixed drink or cream-and-sugared coffee. I've never heard tuning wane before, but it's my new favorite! I suppose "wane" comes from the beveled shape or decreasing thickness of the tool? Best regards!

Thanks, I'll try!

@@StuntProgrammer ​ @Aaron D. Parks Aaron: By my reading through lots of the comments here about your WWV video, it appears as though there is quite a bit of strong interest in lots of people wishing to build their own WWV receiver kit. I know that I am one of those people as well!!! I have been listening to WWV since around 1965 when I was in highschool and I have often dreamed of having my own dedicated WWV receiver to listen to on occasion. So.....how about this??? --- How about you going through the process of refining the development of a "totally cool" WWV receiver that has a pretty good audio output and I will assist you with developing the kit by not only providing a "proper" schematic created using a high-end schematics capture program, but by - ALSO - taking care of designing the PCB layout and mechanical enclosure design??? Sound like a plan??? I work as a "Senior Electronics Mechanical Packaging & PCB Designer" for aerospace/avionics companies, defense contractors, medical electronics firms, R&D laboratories and telecommunications and video electronics companies. I have here-at-home both the CADENCE/OrCAD "PCB Editor" Release 17.4 PCB Design software - and - the SolidWorks 3D Mechanical Design software programs. So, if you are able to design a nicely refined WWV receiver schematic that is completely "tricked out" and high-performance as is possible, then I will expend the effort to design both the PCB and the mechanical enclosure to come up with a nice user-desirable project kit that other people would enjoy buying!!! Sound like a plan??? Please feel free to shoot me an e-mail message and in return, I will send you my "Design Portfolio" which showcases several of my mechanical chassis designs and PCB layouts. In addition, because I have designed some PCB's before that also were for kits, I am aware of the types of certain PCB layout techniques necessary for when a human-being is going to be doing the soldering versus having a wave-soldering machine doing it!!! So.....I think we could make being a GREAT TEAM TOGETHER!!! All that I need is a completed and fully-functional working schematic and I'm good-to-go!!! I am looking forward to hearing back from you shortly and hopefully getting started on a "WWV Receiver" project. Here is how you can reach me: Arrakis.Zexelon@gmail.com Best Regards, Jerry B. Williams Senior Electronics Mechanical Packaging & PCB Designer /

+Abdulrahman Albatti The components marked "FB" are small ferrite beads slid over the transistor legs. I'm afraid I don't have a part number handy.

Cool! I hope you'll share the results. It sounds like a great project. Good luck :)

Bill, did you come up with a good design? I'm interested in doing the same. High quality audio output is important.

I know this reply is late, but I just came across my notes. It looks like I tried a couple of different options but may have settled on six turns of #22 wire on a T37-2 core, bunched fairly close.

Thank you for the kind words! I was able to reduce the beat between the two signals a bit more off camera, maybe once in five seconds? I didn't try to rigorously quantify it. Making fine adjustments was tricky since the trimmer sticks a little. I fiddled with it until my patience gave out and called it good 😋

Thanks for the kind words! I'd love to hear how it comes out.

Hi Craig, check out the following youtube video ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-u0HAkMoAIoA.html The receivers in that video are easy to duplicate and there are circuit boards available for them.

Very cool! That sounds like a very handy way to do it too. Thanks for the kind words. I had a lot of fun with this project. I think I'd probably also have fun throwing money at a rubidium standard, so let's not rule that out too hastily 😉

In all honesty, I did get a used rubidium standard, but then, I do repair work for the NIST Time and Frequency group here in Boulder, so a standard is handy. Of course the first thing I realized was that such standards have more phase noise than a crystal standard, and that they also require frequency calibration. So then you need a GPS receiver to set your rubidium standard's frequency, which is then used to discipline a crystal standard for a clean signal which you use on your bench. There's really no end to it all. It's a search for perfection.

@@johnwest7993 Hahah, yeah... that's how it goes 😅

I haven't done a close analysis, but from a quick glance at the data sheets I found, it looks like a reasonable substitution.

Awesome! I get CHU pretty well here in Michigan too, particularly on 7.850 MHz

***** I used Adobe Illustrator. I wouldn't recommend it for developing schematics from scratch, since it doesn't have any of the features you expect from a proper a schematic capture package. But, if you want to make something attractive for publication, it can do that. Getting the snap settings dialed in right makes it easier.

Dino Papas Thanks and 73!

Dino Papas No problem Aaron. "Beating" WWV even by ear can get you very close although it takes a while to do it that way; that's how I started out (long ago) then graduated to using the color-burst TV signal (unfortunately that doesn't work anymore with new TV systems), and then the Z3801A GPS disciplined reference oscillator and finally a Rubidium standard. BTW, do you have a .pdf copy of your receiver design available?

Certainly. This effect (from electromagnetic radiation having a finite and predictable velocity) is often exploited in practice, for example: in phased antenna arrays, MIMO for Wifi, and such.

@@StuntProgrammer Thanks. So Where can I get those receivers? Is there any kit or assembled product anywhere?

@@israelshapira3665 Sorry, not that I know of. 🙁 This was just a one-off project I made for fun and to use in my own shop.

That's a very thoughtful question. I don't /think/ there would be a meaningful contribution from the doppler effect. I'm confident supposing that the transmitting site and receiving site are not moving relative relative to one-another by any appreciable amount. I'm a little less confident, but still feel pretty good supposing that the point of reflection (or points of reflection) are not moving much if at all for usual modes of ionospheric propagation. Perhaps someone will step in to correct me on this. I have a vague sense that if the point of reflection were moving, as long as it was essentially equidistant between the transmitter and receiver (so that its horizontal velocity away from the transmitter is about the same as its horizontal velocity toward the receiver) the effect might mostly cancel out? I haven't sketched this last bit or tried to work it out for sure, so I don't have a lot of confidence in it.

@@StuntProgrammer Hi Aaron and Ian, yes there is indeed doppler shift using HF to receive WWV because the Ionosphere is ever changing and during part of the day its effective height is greater, and during part of the day its effective height is less. Data acquired by Connie Marshall (K5CM) indicates an accuracy of 1 Hz is reasonable during most times of day, with the exception possibly being around Sunrise and Sunset. Per Connie, "As long as you stay away from "sundown and sunrise" Doppler is usually less than 1 Hz.". Connie's data suggests the variation is +/- 0.2 Hz in the mid afternoon at his location in Oklahoma. Link to Connie's data showing effect of Doppler on the 5 and 10 MHz WWV signal mid afternoon in Oklahoma www.k5cm.com/wwv-doppler-corr.htm Link to Connie's data showing Sunrise and Sunset effect on the CHU Canada signals (3.33 & 7.85 MHz) in Oklahoma due to Doppler www.k5cm.com/chu.htm 73, Don wd8dsb

@@wd8dsb Thank you for your wonderful summary of Connie's work! Sounds like I was right to guess that it would not be a meaningful contribution in this application. But it's nice to know -- and to be able to quantify the likely error -- rather than have to rely on a guess! 😀 Makes a lot of sense that it would be most strongest at sunrise and sunset. Very cool.

Thanks for the kind words are for the information about CHU!

Thanks for the kind words! I think it would be tough to develop as a kit, but it's nice to hear that other folks are interested in the project ☺️

Hi Matt, check out the following youtube video ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-u0HAkMoAIoA.html The receivers you see in that youtube video are easy to build and circuit boards are available, etc.

gbennett58 The supply is 12 volts. I'm not sure about your second question. Isolate it from what?

Aaron Parks in the video you referred to the grounding problem and in passing said something about isolating the power. Perhaps I misunderstood. Do you have an updated schematic?

I haven't dusted it off recently. I believe I was using a four-band trapped vertical before (not optimal, but usually brings in WWV fine).

@@StuntProgrammer That is helpful, thanks. I've been trying various things but so far an 80m 1/L seems to work best but it still fades in and out at least for the 2 days it was up and running. That just proves that a well designed dedicated receiver almost always works better than anything else.

The audio was just an after-thought. If you come up with something better, let me know! I'd be happy to add a link.