SHTF Intro To Radio Direction Finder "Seek & Destroy" Part 2
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- Опубликовано: 30 сен 2024
- Part 2, real life radio direction finding. Taking this teachable moment to demonstrate various gear & techniques in radio direction finding. Not a gear review, but a concept video of the subject.
tags:
shtf wrol prepper preppers prepping survivalist simplex repeater comm comms communication communications ham amateur radio survivalism disaster EMCOMM preparedness
That was better than some of the movies I've watched lately. Good job. Thanks for spending the time to record that.
Thanks for this video. Myself and a friend tracked down a stolen radio which was tuned to the town cctv control room. The person was transmitting and listening to radio comms. With the help of this video we found the location. The house and the room where he was sat. A knock on the door retrieved the radio.
This post made my day... Thank you. Its nice to know a bad guy lost in this case..
Ok now I am REALLY curious as to what you have sitting on the back seat.
+Glen O'Riley same here thats all i can think about.
probably his chest rig and AR
+Glen O'Riley LOL,,, The back seats were removed and a couple of steel lock boxes are in its place where I lock up test equipment and items that can be stolen if the windows were smashed. I distorted the image because there is a magnetic sign with the organizations name that I work for. Though, I wouldn't mind hauling an AR and chest rig if I could...
GUERRILLACOMM
Ah so it was a theft deterrent rather than an "I have something to hide". I can appreciate that.
why so scared
Outstanding demonstration. I'm 61 and have been a public safety bench & field tech/tower erector/broadcast engineer most of my life, and have used the same tactics on numerous occasions, to locate RFI and to map propagation. Quite sure I have the attenuators you needed. I regret we do not live closer. Very thankful this was resolved as it was. Good job! 73! ~Dean from Abilene
i miss Abiliene so much
nice detective work. I havent yet been on a fox hunt but now I get it. Thanks a lot for posting the great vid.
Those poor cows are probably all dead now. :(
Nice one
So what was this bidirecrional amplifier in there for? Cellular? And Was it amplifying any signal it got or only specific?
***** It was for the fire dept. used to amplify the signal inside the plant to the outside when fire fighters go in to battle a fire. The industrial plant is littered with steel and cinder block. hard for a VHF handheld to hit a repeater 25 miles + away or car to car. The amplifier went into oscillations caused by the antennas being too close to each other. Ive seen this happen one time before on 800 MHz.
@@GUERRILLACOMM "It was for the fire dept. used to amplify the signal inside the plant to the outside when fire fighters go in to battle a fire"
So, the fire dept was jamming the sherrif's dept?
@@James_Bowie Not intentionally, but in a way, yes lol.
90 180 and 270
That was pretty exciting following part 1 and 2 in finding the source. Thanks for sharing.
RDF we used in Iraq chasing moving targets that was the funniest QRF missions I ever did it was like a rat race through the city lead Humvee leading the way while four others chased them
Enjoyed it! A 'who-dunn-it' of RF proportions!!
That was your best series on radio yet, problem solving each step with multiple options. Damn it feels good to be a gangster.
No destruction of property? Kinda misleading.
Having a variable or several fixed attenuators helps tremendously. Unplugging untenna from the radio may also help to pinpoint a location once you get very close to the suspected transmitter.
Using a Yagi backwards gives better nulls anyway. A variable stepped attenuator is really easy to build too.
P.S. it was cool hearing MetallicA in your intro. In case you haven't done it already in the past, *you absolutely have to* use Rage Against The Machine's song "Guerrilla Radio" in some of your videos! The title alone is *perfect* for your username.
*Keep educating the Free Republic!*
That isn't how a Doppler direction finder works. The antennas are electronically rotated in a circle by sequentially connecting them to your receiver. Doppler shift varies the frequency slightly as the antenna moves toward and away from the source. This induces a tone onto the signal that is heard with an FM radio. The phase of this tone compared to the phase of the antenna rotation tells the equipment the bearing to the signal.A handy method for hunting when the signal gets too strong is to listen on a harmonic (multiple) of the original frequency. The harmonic will be much weaker and will allow you to get bearings up close. Of course, you have to carry another directional antenna for that band.
That was pretty cool!
Thanks man. I was glad to have the opportunity to show a real live example, instead of talking theory on paper. Nothing beats practical hands on training.
GUERRILLACOMM
These type of videos are so useful. You do a good job of putting the techniques you use in context to the problem you're currently solving and then expanding upon those ideas. This is something an audience would most likely not have if they were just reading a technical manual or studying theory.
Fun to watch, well done - seen this problem before with Bi-Directional amps; squirrely devils. 73's K6XI
So do you bill the company for having to fix their equipment? Who pays for your time? That took you days to find and would imagine thats not cheap. Does the sharrif department pay you then they go after the company? What was the radio for communicating with the garbage trucks? Imagine what someone could do that was doing this on purpose? They could really take down out infrastructure. That I think would be the most damaging terrorist attack a coordinated attack you can't see and don't understand.
I'm probably an idiots but I would think a laptop running linux and a hackrf one would consolidate down most of your equipment..
Were you a 2621? You sound familiar af to me, I went through Corry in 2006.
I found this oddly exciting! I could hunt down signals like that all day everyday .... communications systems and diagnosis are very interesting. Thanks for the great video!
Good stuff! So much better than a white board or powerpoint!
If the repeater lost phase lock wouldn't the local oscillator be sweeping?
I would imagine so, though, repeaters at least have "time out timers". Bi directional amplifiers seems not to have that sort of precautionary protection designed into it.
Not directly, though, I was on the clock as far as compensation.
No, just a telecom tech with an attitude.
Still shoulda dropped steel on it! ;)
Bunker buster!
There ere some nice looking women in there, I just dropped leaflets of notice to vacate before hand. lol
That's only fair! :)
Do you get to stuff it and mount it on your wall?
This was an awesome video! Like a BlackHat movie!
Thanks, Glad you enjoyed it. It was fun having the opportunity to show a real case.
Very cool video 👍🏻
Just participated in my first fox hunt yesterday. New to radio...just got my tech first of June, passed my General two weeks ago, taking Extra next week. My wife has her Tech. and was working with me. We had a county of space to cover. It took us 1 hour 44 minutes to track the signal down. It was an hour before we were even able to get our first reading. The transmitter was set to only 2 watts. Was an interesting process though. There has been a fox lately that has been illegally transmitting on a large superlink system that includes some 12-14 connected repeaters. The fox has been keying up during conversations, transmitting music, and just generally interfering. They think that they cant be caught, but they are mistaken
Great video, and one comment. The yagi will only have a good directional pattern over a very narrow range of frequencies. I model my yagis that I use for direction finding using 4nec2 software to understand at what frequency the yagi pattern becomes inadequate and then I modify the length of the elements to target the frequency of interest (element spacing not as critical). As an example my yagi designed for 146 MHz needs its elements lengthened about 1.5 inches if I want to use it to still have a great front to back ratio on 136 MHz. I just use alligator clips on the end of the elements to lengthen them (clip them to the elements and then use electrical tape to make sure they stay put). I use 136 MHz a lot when tracking down arcing power poles since this is down in the aircraft band where AM is used, and an AM radio with wide filter allows you to easily hear and track the power line interference once you get reasonably close to it (normally within 0.25 miles of the bad pole, and then when I get very close I normally have to throw in 20 to 30 dB of attenuation).
@ 5:47 "My preferred way of looking for you guys"
wink, wink, nudge, nudge - alright there honey badger! Lol
just teasing! thanks for sharing, puts things into perspective.
Ramsey is out of that business now. They only do RF shielded boxes for RF & cell phone repairs. All their cool kit stuff is gone now.
Good job mate. Thats one the 50 owe you boys. ATB Moose Down Under.
Alternate title:
"Oswald Bates Does RDF"
(Living Color reference)
great video, very informative. that piece of gear, that was appropriated without all the cables & equipment. couldn't you try and go online to find what you need to make it function mounted on your vehicle?
how many days did it take to find the location?
One afternoon.
Thanks for the Video. was fun to watch. Love Fox hunting. Hi
Great job locating the signal. Thanks for sharing such an amazing video.
You should go to tactical and practical in Fresno ca. It's your kind of store.
Very cool, I really enjoyed these videos. Thanks for posting.
GREAT VID. Full of great INFO!!
Very cool video! Have you ever done a video on repeaters? It would be very educational.
that thing is pretty sweet man ! very cool !
Nice, so they we unaware of the signal problem, will rebooting the unit straighten it out or will it need something else to fix the problem.
Yeah, they had no clue. The device was associated with the Fire dept, and not their plant comm system. the amp was to help the FD have comms within the factory using their handhelds. lots of dead spots with all that steel & equipment around the property. I unplugged the device and re-plugged it, it did not reset the device to function properly.
Good job well done mate - keep the videos coming please!
That was awesome, thank you for making it
very cool.
Very interesting video ! !
Thank you ! !
It is a project with Oliver and Sean Stone. It will be a year long series. Please let me know how you would be comfortable being contacted. Then I can give you the details so that you can decide if thia is something you still would be interested in.
Respectfully,
Jesse B
I appreciate your vote in confidence.. I have no interest in contacting anyone beyond YT messaging or comment section. Time affiliated with that type of endeavor is something I,m very selfish about and dont have enough of to share.Though, I'm sure you could find someone that will jump on the opportunity to be involved in your project as a consultant.
Thank you sir, for taking the time to do all this. Great stuff
But how did you fix it?
Not my equipment to fix, it was escalated to the folks who was responsible for it, I just pulled the plug on it to stop it.
Excellent vid!
Awesome videos Dude! Very informative!
I'm self-learnt too, RF is an awesome hobby!
Well done you should look up vk3yng sniffer this is the ausi standard . Brian makes them for lots of comms co all over the world.
vk3tkq looks interesting, but I would want something with a wider band, about 6 meters to 70 cm & 800 MHz range. Thanks for watching
Wow. Very impressed!
Great video, very interesting.
HaHa...Bullseye! Sweet.
*locating ham signal*
Great video!!!!!
Great job. Well done.
Impressive...
Good Job!! :-)
Sweet stuff
K.i.s.s. works well. But when we would find the purp. A ham that is a sherriff. He Would get the docks. For entry. We were not allowed to trespass. Until we had a pass. . And the sherriff.( Back up). Was the best. .once. I played the fox. And fooled hunters by heating up a bridge. Near by. Giving me time to return to base. Un caught.
damn, I got blue-balled. here I thought you was going to call in the calvary and watch FCC, police and FBI walk into the place and do some action..... damn. :/
(giggles)
this video rocks, you need to post more of these! what's the best bang for the buck direction finding kit ? i want to find an asshat jamming the local 2m repeaters. i want some LED's to tell me the direction he's coming from.