I built one of these around 1971 out of junk laying around the lab (Rome Air Development Center, USAF, so a good "junk box") and hooked it up to my guitar amp. It was popular at the Griffiss Open House that year. If you can get two dishes, you could get a lot more range out of this because of better isolation from transmit to receive.

Jeri, awesome mix of applied tech, theory, and irony! Persevere.

Great video again! Never thought of giving that use to an LNB. Thanks!

Jeri You're Great ! I love electronics and I can't wait to review the old school and get my lookers into a new NEC Catalog and think stuff up..

C'mon Jeri, show us how to build an AESA.

very Interesting Jeri! Great work.

Hey, how would I jury rig a Radar for gold vein detection? any of the same concepts? if so, what modifications would I have to do?

At least someone who understands the difference between doppler and phase cancelling. I hoave one of the devices but it uses a gunn diode oscillator, frequency is determinated by cavity resonance freq.

Suggestion: Theremins have a lot of good theoretical teaching points, and they are neat, too. A vacuum tube one would be really fun.

You have amazing videos!

Thank you , Something I was always curious about .

I would definitely recommend a look at basic physics tutorials regarding sound waves. Gives you a good amount of basic equations and knowledge to draw on for this sort of thing.

Jeriellisworth, I noticed there are so much of cost-saving design in most DRO oscillator, particularly in some low-cost radars. There is actual Gunn diode in a Radio Shack car radar, but still it's surprising compared to the compexity of the entire circuit... And you're correct, DRO isn't straightforward to design - Capacitance, Inductance and Resistnce do work together / against each other within circuit necessary to send and receive Microwave. It has to resonate or it won't work.

I Love you video, great job! I have a question. Is it possible to pin point a specific Target with a radar? Also to see weather that specific target is coming towards or way from the radar? Thank you for your time

@kenatiod That's a good idea. The radar theremin?

I swear officer, I was only going 1.5 cm/wavelength over! I ran out and bought one of those HotWheels guns about a year ago - they were around $4 at the store. I still haven't done anything with it - but this video has renewed my curiosity.

Καλημέρα από Ελλάδα είσαι το ομορφότερο πλάσμα στον κόσμο

This is really cool. Any idea how accurate a hotwheels radar gun is? I ordered one from ebay to hook to a pi, since I'm currently using an HB100 doppler module and it has low accuracy above 10mph (and can't register things much faster than that).

LMAO So educational yet funny! hahaha the cop scene at the end was priceless!

@jeriellsworth My second antenna in the video was a dead bug detector and didn't need any special construction technique.

@shodanxx It's hard to get the DRO to sweep frequency, but there are a lot of coo things that can be done.

i was really hoping to find something cool to do with all the LNB's i have , but nothing here yet...

Wow very good explanation

The standard radar gun is checked by the officer using a tuning fork which isn't the sound (per se) but the frequency that creates the speed. The officer doesn't whistle into the radio but rather just the end of the radar gun. Higher the pitch, faster the speed. So I'm anxiously awaiting to see you test this in a vacuum. The tuning forks not whistling. It might be a bit hard to breath. ;)

I'd love to see a sonar video too!

Jeri you are my geek Hero...

@DarkGlassly I'm not sure the local oscillator will generate enough wattage to cause any problems. It doesn't differ much from this toy that is presumably safe for kids to point at each other and I don't see a huge advantage to make local oscillator that would swamp out your received signal.

really awsome, with composite video (i know one year passed, but it would be great idea)

@00011theman The DRO oscillator is a tricky device. It's a factor of the shapes in the cavity and the resonator.

@jeriellsworth Can you replace the oscillator and make it less or more then 10ghz?

I always told people that electronics was not that hard and it is so much fun to design and build things using the theory. Wow man. A lady after my own heart. I do not mean any thing weird by it. I just get excited when people educate themselves. That is a lot of reading, and experimenting and designing.

Jeri, If you haven't seen it, you should check out the SAR that some guy made using surplus microwave radio parts. Also, I think speed radar usually does use doppler, at least the old police radar guns do. They take the output of a gunnplexer's mixer diode and measure the frequency to determine speed.

Are you going to do a video on your version of a body scanner?

Oh nice, I have a use for my old Dish LNB that I used to decode encrypted satellite airwaves which penetrated my property! Can't do it anymore. This is really fantastic. I really need an oscilloscope.

@bulbadox That sounds like fun!

Suggestion: Do something that demonstrates core saturation on a transformer. Or try winding your own transformer with a core that is empty, show the effect of moving a soft iron object in and out. Feed a sine wave in one side, and show on your scope both the input and output of the transformer as you move the object in and out. I had in mind using this to convert 115VAC to some arbitrary lower voltage level. The core saturation technique was a technology used in voltage regulators.

@00011theman This is the receiving dish, but to detect the signal from space it needs to generate a low power RF signal. I can detect things several feet away, but it's really only effective a few inches away.

nice tut jerry! :D

I have rarely seen a pinball machine ball cap. I don't remember that machine either, but that's cool

I wanna do something similar but for weather is there any way I could mod one of these toys to do so ?

This radar is fun!

@jkeyzer It's very possible I'm wrong about modern police radar, but I stumbled onto some reference about older radar. Wikipedia also says(and it's never wrong) "However, the change in phase of the return signal is often used instead of the change in frequency"

Would it be possible to change the frequency to about 2-8MHz with the parts of the toy gun? I'm looking in to making a fetal doppler monitor...

Need more info about your body scanner idea!

@00011theman Home TV dishes typically don't send anything to the satellite, however they do have a thing called the local oscillator which runs at 10ghz and is used for receiving. I twisted things around a little to make a transmitter. See my TSA scanner video.

@TheNewYorkPete If I can capture images I will. If I fail there might still be interesting discoveries.

@stemtuber No. It is not a gun diode. It is as I described. Check out Dielectric_resonator on Wikipedia.

Interesting indicator for object movement on a small scale using oscope and speaker, I cannot think of practical use right now, this can be a handy tool for the laboratory or something for a mad scientist. How about tinkering with a Vasco Speedtrap gun off ebay?

@dashxdr Sounds like a variac. :)

Nice explanation and great demo! What the hack do you want... with a body scanner??? :-]

oh my god I never thought of that, I have a couple LNBs laying around too !! hello synthetic aperture radar !! damn, I could even scan the ground for anomalie, this even has a purpose here, (find big rocks in fields before they rise too close to the surface and damage agricultural machinery), I wonder if my ham license cover the Ka/Ku Bands

@jeriellsworth I wonder if you made a large circle of these and stepped in you could make a sort of 3D body scan that can scan 360 degrees and make a picture out of it

This video is fantastic, why are there downvotes?!?! ಠ_ಠ

@AntiProtonBoy It's in progress.

Bit late to the party, but with those two waves, with the antenna in front of the other, is that kinda like how quadrature shaft encoders work?

nice!, thank you!

Hmmm. Could it track airgun pellets sub 1000 metres per second? Maybe I should try it & find out for myself. 👍

Distance from the antenna should be a function of voltage difference?

did'nt see that hp 5300b before.. I've got a 5308A and a 5304A thoose are very cool instruments for their time..

SALUDOS DESDE MISIONES ARGENTINA..!!

Yes reminds me when i was 8 and build crystal radio , after transistor mini ear radio etc. Some people are using ultrasound detectors for radars; Aren’t microwaves toxic to human tissue?( aside from dismantling microwave ovens)

so loverly

your awsome

Honest officer, I was just trying to get out of the way of the multiball!

How do you calculate distance?

I want to make a tracking pan/tilt radar. Can you show how to make it? Thanks (subscribed now)

I'm in love

@jeriellsworth I don't get that because its not like the LNB just receives it has to send things to the satellite in space and then its beamed back down to the satellite provider company

@TheRobert188 To do that she'll need a klystron or a magentron depending on application and some very high voltage powersource and plenty of A/C, which none of these which can be considered modern military grade are avalible on the market

now i can learn how to watch out from an approaching danger....especially a stray golf ball....INCOMING LOL

@joshcryer It shouldn't be too hard. There are many people making continuous wave transmitters with them. The diode detector is simple too. Two schottky diodes.

Actually, at least in traffic radar, Doppler shift is used. At least with the old MPH (X) and K band heads (obsolete). Doppler is used for the actual speed measurement. This is why radar heads are calibrated with tuning forks using a particular audio frequency. The better radar units use phase shift is used to filter out unwanted signals. Not sure about what the new 33Ghz models use.

@Albinorama Yes. I can always use more money. Who doesn't?

I think I am in love LMAO

Why degree of temperature to effec Radar? And Excample JET flaight Deven IC AI( Artificecial Intelegent)....??

I suspect that "ceramic puck" is the Gunn diode, which generates u-waves. The transistor just stabilizes the voltage for optimal gain in the negative resistance region. Don't let the TSA mess with your junk: they can get their own travel jar of surface mount goodies!

@jeriellsworth Was that how they worked? My dad has one, the size of a 26 oz can of fruit, with a wheel on top to crank out the voltage. Another interesting thing is DC-DC converters, using a charge pump. You might be able to make money designing hobby kits for ramsey electronics.

Phew! Hams have used microwaves for transmitters, and I would if I had the need. But I'm a high power radar transmitter engineer so I know the rules.

Re: whistling into CB. While whistling into the CB might be heard from the officers CB radio, assuming he had one in his cruiser and was on your channel, the radar gun would never hear it (early police radars, and still some today, being X band, about 10525 MHz and CB being about 27 MHz). And the radar gun is what tells the speed, not the officers ears. To be sure, officers can listen to the tones, with training this can be informative, but the speed readout is completely internal to the unit.

@jeriellsworth It was just a general reminder, no problem with the oscillator per se, but if coupled to a waveguide/horn antenna, then obviously you should not look into the aperture. If you fancy dabbling with more microwave projects, then the old Dubus magazine online archive may be worth a look for you :)

I lold at the end XD

very nice. a body scanner might need higher than 10GHz but I suppose a 10GHz image of a human might look interesting. might be difficult though to overcome the diffraction limit in combination with near focus with such a large wavelength. maybe a fixed focus phased array that does a 3d probing. or a special shape dish.

Can you make a video on sonar?

@Gameboygenius Already working on one 10x better. I have videos of the progress.

@nolawsuits Interesting. I didn't know this.

hey, can you make theremin.. out of microwaves?

Still looking for that MW drone killer made using commercial microwave emitters... something with enough reach to pluck them from the sky at 10,000 ft! Gonna need something that won't burn like Pringles cans do!

Jeri you are the American dream! You must have read alot of Metzger and Grossblatt. Your probably the only girl on your block that had a bionic barbie that kicked 'Heinie-ken'

Omg i just fell in love at the rate of 9.8 m/s

wait how far can this go because it has to transmit all the way to space

Jeri, what is your educational background?

That whistling into the CB @ 3:45 was not a myth. back when speed radar first came out. it was a Doppler based system and the received signal was then down converted using a superheterodyne process into an audible tone. and the faster something came towards it, The higher the pitch and faster away, The lower. The idea behind whistling into the CB was to confuse the officer's ability to hear the tone from the radar while hearing you whistle over the radio.

we use to see gun diode oscillators in early alarms as motion detectors complete with a little feed horn , look out at your ham radio fair

4:15 really has a buffalo bill lotion on its skin type of vibe.

@g7gij I might strike water here in Oregon. That is about it.

sweet!

Great. Technical enough to understand and learn something from and not so full of acronyms that a normal dude with an engineering degree other than electrical can keep up. A+ Now how do i make it spin, detect range, and display identified targets as a dot on a screen instead of a wave form. 🥵

Show how to build 3d radar and s band with smart cpu can lock

I guess the police officers voice was slowed down 'cause you were travelling so fast, there was a time dilation effect :P

Williams Police Force. Williams. Pinball games. Yes! I haz an idea! Ben Heckendorm has built his own pinball game. Build your own and beat him in coolness!