That antenna is a full Garmin GPS that outputs NEMA strings. Get it powered out and you should be able to use it for APRS on some of your vehicles. Take it with you on the boat or railroad car you built. That antenna has a lot of potential for projects.
cats LOVE LOVE LOVE old used backpacks, don't they. Anything that's been worn by a sweating human that went to interesting new places and then was never washed.
Wires with a button coming out of a backpack full of nails. Im going to go out on a limb and say this isn’t one to walk around town or go to the baseball game with.
The nails were probably for setting surveying benchmark points in the ground. Check if some are marked PK or have an indent directly in the center of the head.
6:15 if this is the model i'm thinking of, you actually have to pay a pretty hefty subscription to make use of the DGPS. without a subscription though, this model may offer regular GPS and even output 1 Hz NMEA messages (like any off the shelf usb GPS antenna). the serial port may be RS-422 though
GIS major recent grad and county GIS employee! Love the work you do on this channel as I too am a radio enthusiast and tinkerer. The antenna plate is a type of metamaterial developed by Garmin. The more advanced ones of this year can even be embedded into the bezel of their fitness watches. Awesome and informative video as always!
That was a rig setup of either a treasure hunter wanting complete coverage of an area OR specifically searching for something in particular in either case marking every few square feet with his marker button. The rusty paraphernalia in the pocket is things he dug up, metal detector treasure hunters always keep the undesirable finds dug up to dispose of later rather than just discard them littering up sites.
Because surveyors don't use 'nails' They use Spikes. Having to find a reference point by searching for a nail would be an absolute nightmare, every surveyor would need a good metal detector just to do his job, & even then with no discrimination outside of iron you'd have a pile of undesirables before finally getting a hit on your nail ..
@@saveitforpartsOh do you remember the "Bible" McGuire, Goodchild and Rhind book? Well, I saw a lecture by Goodchild when at Leicester for my MSc GIS course. Met David Rhind, head of the British Ordnance Survey. And Dave McGuire was my course director at Leics Uni. He was the No 2 at ESRI a long time. God all history now. I also flew to ESRI for that 8 hour interview followed by a 20 minute seminar when you are exhausted at 4pm!
That is one cool find Gabe! Definitely worth the $5 you paid for it. I also have a similar DGPS receiver, They still work here in the UK for DGPS and maritime signals. I think there are still 6 or 7 transmitters working in the Khz range.
My old Garmin GPS 12 used a very similar looking four pin plug for power and data in / out. I wouldn't be at all surprised if that dome contains a built-in GPS receiver.
2:50 bro, that is OLD school now. i wonder if that receiver still has a valid account with it. i busted one of those out in my lab a while back and we found out it was still working somehow. i think it was just before the receiver we had was shut off (the service was discontinued). even with the far more accurate methods we have now, DGPS was still useful for quite a while. that antenna is legit too, that's worth whatever you paid for the bag. its probably single element, but it bet it has a pretty good gain
*_"At great risk of releasing the Magic Blue Smoke..."_* That is when you can tell _hermetically sealed devices_ have failed. Those devices are filled with _hermites,_ which happen to look like smoke. When the device smokes, you know your termites are escaping...😉
The Garmin gps pole antenna (i think) is the entire GPS receiver and not just an antenna. I have one similar to it. But it might just be the differential GPS receiver, now that I think about it... the other serial cable with the custom round 4-pin connector is for the Garmin 40 and 12 handheld units I have an original gps40 from 1994 that I bought as a demo unit for lots of money!
10:06 looks like a slot antenna so rather counter intuitive it is a horizontal antenna that is vertical polarised. That figures if it receiving a local ground based signal.
That four-pin connector goes to the better Garmin GPS receiver. Slightly lower quality ones use a similar connector but with a center pin to keep from mixing the cables up.
The 4-pin proprietary adapter looks like it goes to the old GARMIN GPS12 handheld GPS from the 90's. My guess is that somehow the previous owner used this contraption in addition to said GARMIN GPS unit or similar unit.
I think the array of pcb trace of the garmin antenna is a set of small antenna. Making possible to pin point your exact location using the different strength of rf that you receive on each small antenna. (Of cours the software need to know the position of these emiting station)
the 4 pin connector looks like the one i have for a Garmin GPS72 handheld unit, you should have 12V DC, Ground, and Tx/Rx Serial RS232 and i think RS239? not 100% on the 2nd serial output, but it should be standard nmea output and allow you to view/edit waypoints on a PC with the garmin software (or in linux with any GPS software that can pull/edit GPS waypoints)
It may seem weird, but it amuses me greatly when you haven't got a clue what something is but you're still willing to screw around with it. To be clear, I haven't got a clue what that stuff is either - and my first four years of college were as an EE major with a pure math minor. (Grad school was applied mathematics.)
search for the pinout for the garmin GPS receiver. it is likely RS422 and not RS232, and will need 12 volts. The data output should be standard nema GPS sentences. or it could be the tsip ask and answer protocol.
The actual antenna part just need some bias-t voltage (measure it while on), and you could probably use your SDR on it. Might not downconvert at all. You need to tune to GPS frequency on the SDR, that antenna is not the dGPS antenna, thats inbuilt or separate (inbuilt for boats as far I know) And the dGPS sends on example 283khz not mhz. You tuned your sdr to mhz? Get inside to remove filters to get inmarsat and such. If you dare!
I don't currently have an SDR that will transmit. The most test equipment I really have is a NanoVNA for antenna analysis, and I don't even know how to use all the features on it!
@@saveitforparts For working indoors, you could try a re-radiating setup. Get a powered GPS antenna (like the one you have here) and set it up outside, run a cable inside to a GPS antenna that doesn't have an LNA in it. Hook up a Bias-T to power the outdoor antenna, and the indoor one will re-radiate. Just be aware of how much juice you're giving it as you're effectively building a small-scale GNSS spoofer for anyone else who picks it up. Shouldn't generally be an issue though as these signals usually require line-of-sight.
The antenna on that Garmin dome is likely for the main GPS signal just like any other GPS antenna -- I think the funky grid pattern is some kind of printed phased-array, rather than the usual dielectric PATCH antenna that most cheap GPS antennas implement. In your case, my suspicion is that it's a phased-array feeding a little cavity filter, and then an LNA, and then to the actual receiver hardware in the lower "can". It's likely an NMEA serial port on that connector, and it's likely that a bit of googling will reveal its nature...
I actually don't remember, I've had this for a couple months now. It might have been publicsurpls.com, I've frequently bought weird tech for almost no money on there.
I didn't realize DGPS wasn't a thing any more- has it been replaced with those weird auxillary GPS satelites, or does everyone just use the RTK setups that use math and a stationary receiver to send you corrections over a cellphone etc?
I think 4G and 5G has some positioning stuff built-in, the phone and tower can talk to eachother and compare time lag for distance and direction calculations.
What are the benefits of GPS antenna? They are larger, higher gain, and are most often used in situations where a receiver with an internal antenna cannot pick up the signal as they can be readily mounted.
Wondering if its some kinda microstrip yagi/quasi yagi antenna, or maaaaybe just meandered AF; (like a MIFA) to fit an appreciable fraction of 1.5m (roughly the wavelength of 200Mhz) into such a small object.
I think it was a mix of electronics and excavating company stuff. Some of those auctions are just old stuff from a company that's upgrading or has gone out of business.
Haven't you heard that they have improved batteries so they no longer leak? They still die, they just don't leak. You get a much better idea of how the antenna array interacts with the wave propagation you simply put a tennis ball on top. Supposedly this one has some form of compass built in as well. I'm sure those header pin connections you found are for burning and calibration I think the pin out is: Pin Function Color 1 Rx/A (in+) White 2 Ground Black 3 Power (Fused 1A) Red 4 Accessory Power Orange 5 Tx/B (Out-) White/red 6 Rx/A (Out+) Grey 7 Rx/B (In-) White/Orange 8 Data? PPS Violet I'll bet you a dollar in donuts that each depression of that button spits out a CSV file on pin 8. They have one of these on top of the helper bot at Lockheed in LA. They made it out of a Segway. It just carries around a service tray. You pin your requisitions to it with a magnet, it goes to the stock room, they put your parts on the tray and it comes back. Otherwise it's about a half a mile to and from.
Since you have the backpack, now, that can apparently hold an antenna, there is clearly only one way for you to go with this, and that is to create your own one-man mobile uplink unit: th-cam.com/video/XG_KlFvTMyw/w-d-xo.htmlsi=NnrNQnd2dqNtVG6R
That resembles the backpack that 2010 "census" workers (former acorn employees) wore as they were tagging certain front door coordinates for "unknown" purposes.
What can you do with a GPS antenna? A GPS antenna is a device that receives radio signals from GPS satellites at varying frequencies. The antenna expands the signals and converts them into electronic signals so that they can be interpreted by a GPS receiver. The GPS receiver then uses these signals to give an accurate estimate of the receiver's location.
That antenna is a full Garmin GPS that outputs NEMA strings. Get it powered out and you should be able to use it for APRS on some of your vehicles. Take it with you on the boat or railroad car you built. That antenna has a lot of potential for projects.
Poke at it with a USB-Serial adapter,and you might get NMEA strings at 4800 or 9600baud.
What if i hook it up to a 1000kw generator can i cook food with it?
@@trueKENTUCKYProbably
cats LOVE LOVE LOVE old used backpacks, don't they. Anything that's been worn by a sweating human that went to interesting new places and then was never washed.
As a fellow Gabe from Minnesota who works in GIS and has similar interests to you. Glad to see that you explore such a vast landscape of interests
Ha, very nice! I haven't done it professionally for a while, but I still dabble in GIS stuff for hobbies :-)
Keep up the good work!
Wires with a button coming out of a backpack full of nails. Im going to go out on a limb and say this isn’t one to walk around town or go to the baseball game with.
Definitely don't evangilise Islam at your local airport.
The nails were probably for setting surveying benchmark points in the ground. Check if some are marked PK or have an indent directly in the center of the head.
6:15 if this is the model i'm thinking of, you actually have to pay a pretty hefty subscription to make use of the DGPS. without a subscription though, this model may offer regular GPS and even output 1 Hz NMEA messages (like any off the shelf usb GPS antenna). the serial port may be RS-422 though
that backpack would make a killer ham man pack.
That backpack is screaming man portable HF activation to me. 😎
You truly have to promote your second channel More, ive been here for almost 2 years now, and this is the first im hearing about it!!! ❤🐈🐱🐾
I also need to put more content on there!
what's the channel name?
@@chlebauer it's in the information for this video.
GIS major recent grad and county GIS employee! Love the work you do on this channel as I too am a radio enthusiast and tinkerer. The antenna plate is a type of metamaterial developed by Garmin. The more advanced ones of this year can even be embedded into the bezel of their fitness watches. Awesome and informative video as always!
Very cool! I thought I'd get into GIS with a government agency for a while, but just drifted into other work
Good score on parts. I like the Garmin antenna too.
The original NDGPS in the USA was on 285-315KHZ -- note the 'K'. That's the frequency range of maritime nav beacons.
That GPS antenna came apart a lot easier than the surplus Trimble unit I got my hands on a while back.
That was a rig setup of either a treasure hunter wanting complete coverage of an area OR specifically searching for something in particular in either case marking every few square feet with his marker button. The rusty paraphernalia in the pocket is things he dug up, metal detector treasure hunters always keep the undesirable finds dug up to dispose of later rather than just discard them littering up sites.
Because surveyors don't use 'nails'
They use Spikes.
Having to find a reference point by searching for a nail would be an absolute nightmare, every surveyor would need a good metal detector just to do his job, & even then with no discrimination outside of iron you'd have a pile of undesirables before finally getting a hit on your nail ..
More interesting videos from you! Great job dude.
God that was gear to die for in the 90s! I was a GIS guy back then, even made it to Redlands and met Jack Dangermond!
Cool! I remember reading a lot of his papers. Got a job offer from ESRI once, but I didn't want to move to California.
@@saveitforpartsOh do you remember the "Bible" McGuire, Goodchild and Rhind book? Well, I saw a lecture by Goodchild when at Leicester for my MSc GIS course. Met David Rhind, head of the British Ordnance Survey. And Dave McGuire was my course director at Leics Uni. He was the No 2 at ESRI a long time. God all history now. I also flew to ESRI for that 8 hour interview followed by a 20 minute seminar when you are exhausted at 4pm!
That is one cool find Gabe! Definitely worth the $5 you paid for it. I also have a similar DGPS receiver, They still work here in the UK for DGPS and maritime signals. I think there are still 6 or 7 transmitters working in the Khz range.
My old Garmin GPS 12 used a very similar looking four pin plug for power and data in / out. I wouldn't be at all surprised if that dome contains a built-in GPS receiver.
great video! love your videos and really enjoyed this! ty
2:50 bro, that is OLD school now. i wonder if that receiver still has a valid account with it. i busted one of those out in my lab a while back and we found out it was still working somehow. i think it was just before the receiver we had was shut off (the service was discontinued). even with the far more accurate methods we have now, DGPS was still useful for quite a while. that antenna is legit too, that's worth whatever you paid for the bag. its probably single element, but it bet it has a pretty good gain
And it's cat-friendly as well, maybe soon we'll see how helpful the contents of the backpack are in the hunt for Bigfoot.
*_"At great risk of releasing the Magic Blue Smoke..."_*
That is when you can tell _hermetically sealed devices_ have failed.
Those devices are filled with _hermites,_ which happen to look like smoke. When the device smokes, you know your termites are escaping...😉
The Garmin gps pole antenna (i think) is the entire GPS receiver and not just an antenna. I have one similar to it. But it might just be the differential GPS receiver, now that I think about it...
the other serial cable with the custom round 4-pin connector is for the Garmin 40 and 12 handheld units I have an original gps40 from 1994 that I bought as a demo unit for lots of money!
10:06 looks like a slot antenna so rather counter intuitive it is a horizontal antenna that is vertical polarised. That figures if it receiving a local ground based signal.
That four-pin connector goes to the better Garmin GPS receiver. Slightly lower quality ones use a similar connector but with a center pin to keep from mixing the cables up.
GPS/GLONASS antennas, marine heading sensors and even antennas for weather information and entertainment.
The 4-pin proprietary adapter looks like it goes to the old GARMIN GPS12 handheld GPS from the 90's. My guess is that somehow the previous owner used this contraption in addition to said GARMIN GPS unit or similar unit.
These 4 Pin connectors are standard garmin connectors used for data, or to feed a transducer or many other things. i bet thats a data line.
I think the array of pcb trace of the garmin antenna is a set of small antenna.
Making possible to pin point your exact location using the different strength of rf that you receive on each small antenna.
(Of cours the software need to know the position of these emiting station)
It would be great for you to combine that with your cyber deck and some other peripherals to create the ultimate GIS/Comms backpack!!
you might be able to use the Garmin antenna as an extension for other Garmin products like car radio built in navigation or shipping navigation.
what @patchvonbraun said. looks like a structured phase array. and the other things mentioned.
Use Garmin Head with Raspi, add chrony and you have a very accurate ntp time server
Cool shirt
the 4 pin connector looks like the one i have for a Garmin GPS72 handheld unit, you should have 12V DC, Ground, and Tx/Rx Serial RS232 and i think RS239? not 100% on the 2nd serial output, but it should be standard nmea output and allow you to view/edit waypoints on a PC with the garmin software (or in linux with any GPS software that can pull/edit GPS waypoints)
Great find for only $5
Very cool!
It may seem weird, but it amuses me greatly when you haven't got a clue what something is but you're still willing to screw around with it.
To be clear, I haven't got a clue what that stuff is either - and my first four years of college were as an EE major with a pure math minor. (Grad school was applied mathematics.)
Power to the Sripol People!
Antennas ; GPS 19x NMEA 2000 · 10 Hz GPS external receiver/antenna, uses NMEA 2000; for use with Garmin MFDs ; GA 38 GPS/GLONASS
search for the pinout for the garmin GPS receiver. it is likely RS422 and not RS232, and will need 12 volts. The data output should be standard nema GPS sentences. or it could be the tsip ask and answer protocol.
The actual antenna part just need some bias-t voltage (measure it while on), and you could probably use your SDR on it. Might not downconvert at all.
You need to tune to GPS frequency on the SDR, that antenna is not the dGPS antenna, thats inbuilt or separate (inbuilt for boats as far I know)
And the dGPS sends on example 283khz not mhz. You tuned your sdr to mhz?
Get inside to remove filters to get inmarsat and such. If you dare!
Dang Son. In my country That's a Bomb Alert. Bomb Squad & all that Sh*&t - and you just clicking the Clicks Nonchalantly.. Happy Days.
Do you have any kind of RF test jig, where you can do a RF version of a wind tunnel?
Can you use your SDR to transmit test signals?
I don't currently have an SDR that will transmit. The most test equipment I really have is a NanoVNA for antenna analysis, and I don't even know how to use all the features on it!
@@saveitforparts For working indoors, you could try a re-radiating setup. Get a powered GPS antenna (like the one you have here) and set it up outside, run a cable inside to a GPS antenna that doesn't have an LNA in it. Hook up a Bias-T to power the outdoor antenna, and the indoor one will re-radiate. Just be aware of how much juice you're giving it as you're effectively building a small-scale GNSS spoofer for anyone else who picks it up. Shouldn't generally be an issue though as these signals usually require line-of-sight.
The antenna on that Garmin dome is likely for the main GPS signal just like any other GPS antenna -- I think the funky grid pattern is some kind of printed phased-array, rather than the usual dielectric PATCH antenna that most cheap GPS antennas implement. In your case, my suspicion is that it's a phased-array feeding a little cavity filter, and then an LNA, and then to the actual receiver hardware in the lower "can". It's likely an NMEA serial port on that connector, and it's likely that a bit of googling will reveal its nature...
my gosh!! How do you find these great deals! There is thousands of dollars worth the gear in that bag! totally gelly dude!
on Ebay 440usd i just search
I hang out on lots of estate sale and surplus auction websites. It's a great way to fill my house with unnecessary junk 😅
The backpack for ht modole radio
magic blue smoke😂😂
What auction did you get it off of?
I actually don't remember, I've had this for a couple months now. It might have been publicsurpls.com, I've frequently bought weird tech for almost no money on there.
What would happen if you put that antenna at the focal point of a 12 foot dish?
I could potentially use it as an L-band antenna, I might have to find and disable the filter unless I only want GPS frequencies.
a Peter Sripol shirt ...noice xD Are you flying rc models too ?
I've never been very good at RC planes, I need to work on those some more :-)
I didn't realize DGPS wasn't a thing any more- has it been replaced with those weird auxillary GPS satelites, or does everyone just use the RTK setups that use math and a stationary receiver to send you corrections over a cellphone etc?
I think 4G and 5G has some positioning stuff built-in, the phone and tower can talk to eachother and compare time lag for distance and direction calculations.
What are the benefits of GPS antenna?
They are larger, higher gain, and are most often used in situations where a receiver with an internal antenna cannot pick up the signal as they can be readily mounted.
i love that backpack though, i would have paid more than $5 for it!
GIS stands for GET IT SURVEYED
That's a land surveyor joke
because of your videos I'm going to buy a rtl sdr. But I was wondering what version would be better, the v3 or v4 ?
Both should be similar, I think the v4 is actually cheaper at the moment and has a couple more features.
@@saveitforparts ok thanks
Wondering if its some kinda microstrip yagi/quasi yagi antenna, or maaaaybe just meandered AF; (like a MIFA) to fit an appreciable fraction of 1.5m (roughly the wavelength of 200Mhz) into such a small object.
4:15 can you make it complete for a reasonable amount ?? Also, if you don't do a series on this, I'm pulling your Parts card. 🤣🤣
I might be able to use the antenna / GPS unit on my boat, but the differential unit isn't really useful since that system went offline.
12:55 YES and YES!
The GBR 23 is a remote, auto-tuning, differential beacon receiver with a built-in H-field antenna. Stolen from the Garmin web site
what are some auction sites that you use?
Auctionguy.com is a good one, or Publicsurplus.com for government stuff.
I have a TON of old Trimble stuff if you're interested.
Sounds tempting but it might just sit on the to-do pile forever! I don't know what I'd actually do with some of that 😅
@@saveitforparts no problem man. Let me know if you change your mind, it's just sitting on shelves would love to box it up and send it out!
Nails😊
Hello.
I'm new to your channel; was the auction specifically aimed at electronics?
I think it was a mix of electronics and excavating company stuff. Some of those auctions are just old stuff from a company that's upgrading or has gone out of business.
Eh can't all be winners. Save it for parts!
Have you messed with ATAK since you're into GIS?
I haven't, seems interesting though!
Do not take that to the airport.... I'm so jealous..
WHAAAAAAAAAAAAAAAAAT???? COOL!
Sripol People!
build an overly complicated APRS rig?
As a land surveyor, GIS is short for, 'Get it Surveyed'.
Haven't you heard that they have improved batteries so they no longer leak?
They still die, they just don't leak.
You get a much better idea of how the antenna array interacts with the wave propagation you simply put a tennis ball on top.
Supposedly this one has some form of compass built in as well.
I'm sure those header pin connections you found are for burning and calibration
I think the pin out is:
Pin Function Color
1 Rx/A (in+) White
2 Ground Black
3 Power (Fused 1A) Red
4 Accessory Power Orange
5 Tx/B (Out-) White/red
6 Rx/A (Out+) Grey
7 Rx/B (In-) White/Orange
8 Data? PPS Violet
I'll bet you a dollar in donuts that each depression of that button spits out a CSV file on pin 8.
They have one of these on top of the helper bot at Lockheed in LA.
They made it out of a Segway.
It just carries around a service tray.
You pin your requisitions to it with a magnet, it goes to the stock room, they put your parts on the tray and it comes back.
Otherwise it's about a half a mile to and from.
Since you have the backpack, now, that can apparently hold an antenna, there is clearly only one way for you to go with this, and that is to create your own one-man mobile uplink unit:
th-cam.com/video/XG_KlFvTMyw/w-d-xo.htmlsi=NnrNQnd2dqNtVG6R
That resembles the backpack that 2010 "census" workers (former acorn employees) wore as they were tagging certain front door coordinates for "unknown" purposes.
MUST NOW BUILD HOMEMADE GPS/CYBERDECK INTO BACKPACK!!!! 🤞
My ADHD says cool.
What can you do with a GPS antenna?
A GPS antenna is a device that receives radio signals from GPS satellites at varying frequencies. The antenna expands the signals and converts them into electronic signals so that they can be interpreted by a GPS receiver. The GPS receiver then uses these signals to give an accurate estimate of the receiver's location.