Build a Radar from Satellite Dish Parts - Speed Radar Basics

[VERGIS92]

At last! a clever woman you can date, and can talk about radar technology , instead of the boring things most girls are into, and whose most important day in life is their wedding day...

My most important day is when I make the software for passive radar that can detect stealth

[mrsayao]

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...

[jacobg1777]

Can you pull me over and arrest me??????

[Anuradhai4i]

Good stuff !!!!

[405chevy]

when she said the doplar effect i thought of sheldon.

[jvn1111]

Good job Jeri, keep it up !!! thanks for your video,

[xXx0nIRvaNA0xXx]

i love girls that loves technology XD

[effee1000]

Get rid of that crappy Tek scope and get an Agilent! LOL.

[kd5exr]

Are you a ham radio op? If so what is your call sigh?

[kentuckycowboy2]

Thank you , Something I was always curious about .

[12ock]

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

[lhatchy1]

Can you show us what we can do with a tv antenna, dish thingy?

[TheRobert188]

to you can make a military radar

[batosia34]

@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

[DrMario2007baka]

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.

[bulbadox]

Can you make a video on sonar?

[jeriellsworth]

@bulbadox That sounds like fun!

[hugos31]

graciosa pero interesabte

[00011theman]

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

[jeriellsworth]

@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.

[00011theman]

@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

[jeriellsworth]

@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.

[00011theman]

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

[jeriellsworth]

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

[00011theman]

@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

[FlyKingRy]

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..

[shodanxx]

search for

The_Gunnplexer_Cookbook.pdf

ebay item 160515106126

150530528457

there is a common piece of outdoors security equipment that uses x-band that could be a useful cheap source of radar gear, I can't find it at this time

have you tried making a crude thermal imager using a strip of PIR sensors ?

or ultrasonic transducers to make something like a crude sonogram

also do you have problems bringing projects to completion ?

[shodanxx]

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]

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

[shodanxx]

@jeriellsworth

I would like to suggest the following reads thegleam.com slash ke5fx

and in particular

thegleam.com slash ke5fx slash uwave.html

where he uses gunnplexer diodes to PSK modulate an ethernet link over 10ghz if I understood correctly

oh and I just noticed looking that up that he made an OSS GPIB program, finally I may be able to talk to my old function generator :)

sorry I had to decompose the URL to get through youtube spam filter

[thewii552]

jeri, you became a partner? i wish i was...

[Films4You]

Got yourself a Ticket, ha, ha, har. Not taht it's funny to get a ticket, just the way you get one.

[W0000000P]

i like pies

[telesniper2]

I think you got 3 cm confused with 3mm. Good try, though!

[jkeyzer]

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.

[jeriellsworth]

@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"

[a120068020]

Very cool video Jeri, I will forward the video to a microwave expert at my radio club, he should find it very interesting. Take care, Mike (A1200/M0SAZ)

[adrianmouse666]

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

[chrisgj198]

What will be the IRC command to switch the drunkcam between mm-wave and xray backscatter views?

[Gameboygenius]

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!

[jeriellsworth]

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

[gcs8]

you the hacker, also like how you use a battery in your demo of the dop and dc voltage

[nolawsuits]

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. ;)

[jeriellsworth]

@nolawsuits Interesting. I didn't know this.

[Fhajad]

"On the real cheap" wut

[BlackJavaBean]

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.

[aoeuuiaiui]

I find it funny that YouTube suggest's Britney Spears's Radar song as a related video...

[drethedog]

Jeri you are my geek Hero...

[AmazGraz]

Yeow. Well how about a radar for yacting, that would detect, aleart, and re-navigate your boat when you were sleeping so that no one would have to be on watch at night?

[AmazGraz]

@AmazGraz OOPS! Alert. Duh.

[g7gij]

I liked that video it was cool.

How about building a ground penetrating radar. You could strike oil in your back yard.

and be rich like the Clampett's.

[jeriellsworth]

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

[First2ner]

body scaner? cool, do tell

[AntiProtonBoy]

Need more info about your body scanner idea!

[jeriellsworth]

@AntiProtonBoy It's in progress.

[kenatiod]

Great presentation, Jeri! Now wire it up to get the audio off vibrating objects on the other side of a wall.

[jeriellsworth]

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

[TheNewYorkPete]

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

[jeriellsworth]

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

[w0mblemania]

Omg it's the Williams cops.  Getaway getaway!

[jeriellsworth]

@w0mblemania High Speed will get you in trouble every time.

[neuraxon77]

Missed by /that/ much, thanks to my fluid metamaterial secret agent cloak. :)

[stemtuber]

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]

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

[burgerking220]

wouldnt mind get arrested by that officer. ;)

[DarkGlassly]

Just a reminder for anyone playing with 10GHz with horn antennae (from a Gunnplexer, or LNB oscillator modified into a transmitter), NOT to look directly into it, as it can cause damage to the retina. But I would hope you all knew that already ;)

[jeriellsworth]

@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.

[DarkGlassly]

@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 :)

[Albinorama]

Jeri needs money....

[jeriellsworth]

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

[Albinorama]

@jeriellsworth I meant, you are trying to sell you.Next video you should add a CALL NOW message.

[MrTechGuy1995]

Oh wow, I'm going to stick with my 1's and 0's and leave signal electronics alone, the seem way to complicated!

[K0W0O0N0]

Nice explanation and great demo!

What the hack do you want... with a body scanner??? :-]

[scafativ]

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

[DanFrederiksen]

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.

[wizzra]

nice tut jerry! :D

[sk7ca]

That cop sounds drunk! XD

[jeriellsworth]

@sk7ca Corrupt cop. Whistling into his CB and drinking on the job.

[sk7ca]

@jeriellsworth hahah! :D not very good! :P

[dashxdr]

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.

[jeriellsworth]

@dashxdr Sounds like a variac. :)

[dashxdr]

@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.

[chrisgj198]

Can we please have a flying spot backscatter machine for moar resolution and mutation?

Maybe start with one of these: ebay 400117683173

And for the safety whiners, of course it would be safe to xray random people, just ask the TSA!

[Pruncible]

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

[Twistx77]

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

[joshcryer]

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.

[jeriellsworth]

@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.

[jeriellsworth]

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

[Intosia]

Thats pretty interesting :)

[azayles]

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