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Brief:

HackRF receiver/transmitter for 0Mhz-6ghz
--general purpose SDR not the best at receiving but good for the price (others you may look at would be limeSDR, bladeRF, USRP forget which model exactly)
YardStickOne receiver/transmitter for sub-1ghz (limited ranges)
--specific purpose SDR things like garage doors, keyfobs, other general wireless control gizmos normally operate in this range
UbertoothOne receiver for bluetooth (2.4ghz band)
--mainly for bluetooth, but works for anything on the 2.4ghz band if you want to analyze or figure something else to do with that data
SDR MObile Kit receiver only (25Mhz-1.7ghz)
--best thing to get introduced into the SDR field, learn to listen and figure out what you are listening to and you will find out if you like things like antenna & radio theory; lots and lots of projects can be done with this (lots of the projects can be found on rtl-sdr.com along side of everything hak5 has done on the shows with them)

You can find out more info about the SDR mobile kit stuff on that rtl-sdr.com blog and you can find more about the other ones at https://greatscottgadgets.com/ plus GSG also has an awesome lesson section about getting into the HackRF and the information can be applied to pretty much all the SDR devices in one manner or another

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38 minutes ago, bored369 said:

Brief:

HackRF receiver/transmitter for 0Mhz-6ghz
--general purpose SDR not the best at receiving but good for the price (others you may look at would be limeSDR, bladeRF, USRP forget which model exactly)
YardStickOne receiver/transmitter for sub-1ghz (limited ranges)
--specific purpose SDR things like garage doors, keyfobs, other general wireless control gizmos normally operate in this range
UbertoothOne receiver for bluetooth (2.4ghz band)
--mainly for bluetooth, but works for anything on the 2.4ghz band if you want to analyze or figure something else to do with that data
SDR MObile Kit receiver only (25Mhz-1.7ghz)
--best thing to get introduced into the SDR field, learn to listen and figure out what you are listening to and you will find out if you like things like antenna & radio theory; lots and lots of projects can be done with this (lots of the projects can be found on rtl-sdr.com along side of everything hak5 has done on the shows with them)

You can find out more info about the SDR mobile kit stuff on that rtl-sdr.com blog and you can find more about the other ones at https://greatscottgadgets.com/ plus GSG also has an awesome lesson section about getting into the HackRF and the information can be applied to pretty much all the SDR devices in one manner or another

Does the HackRF One do everything all the others do? If the Yard Stick One is a receiver and a transmitter why do they say it works well in combination with the SDR Mobile Kit? Does the Ubertooth One transmit?

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1 hour ago, zkylet said:

Does the HackRF One do everything all the others do? If the Yard Stick One is a receiver and a transmitter why do they say it works well in combination with the SDR Mobile Kit? Does the Ubertooth One transmit?

1. yes and more since it has a larger band it can utilize (plus you can get the portapack and that makes it twice as awesome)
2. both the YS1 and the HackRF are half-duplex meaning they can only do one or the other at one time, so you could use the RTL-dongle (what's in the SDR kit) to receive the signal and the YS1 to transmit or you could use the YS1 to send a jamming signal (to block a keyfob from working) and use the rtl-dongle to receive the code the keyfob sent, then when the keyfob is pressed again you record the second signal with the rtl-dongle, stop the jamming with the YS1 and then transmit the first code again (thereby leaving you with an unused rolling code to transmit later)  You can use the HackRF, YS1, or the RTL-dongle to receive but the RTL-dongle being designed for listen only does recieve signals better than the hackRF, but it's more limited in the band it can use.
3. I don't believe so, I could be wrong though, I've only used it for receiving so far.

Honestly if you are just getting into it, get the SDR mobile kit is the way to go, you really need to learn more about what you are getting into so you can choose what you want to do with it and then be able to pick the tool that is best suited for the particular job.  It's inexpensive so if you decide it's not for you, you're not out that much.

And although I highly recommend the hak5 shop and want to support them, this one is a much better (upgraded chip & heatsink case) rtl-dongle http://amzn.to/1SLPS6F and you get two antennas with it.  It's currently out of stock (so is the hakshop), but you could order it from the worldwide if you want one right now. http://www.rtl-sdr.com/buy-rtl-sdr-dvb-t-dongles/

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