Introduction: Powered USB Hub for Rtl-sdr

Picture of Powered USB Hub for Rtl-sdr

Powered USB hub. I use it with a battery pack for rtl-sdr on my phone, which doesn't supply enough current and that means I can't do things like ADS-B reception and tune in the world.

Step 1: Gather Materials and Tools

Picture of Gather Materials and Tools

Pictured are, from bottom counter clockwise:
1. unpowered USB hub
2. cutting board (optional)
3. USB battery pack. This one is capable of 1A, but more is always better.
4. USB OTG cable
5. electrical tape. Use instead of shrink tube if in a hurry
6. wire strippers
7. test bulb. Completely optional. I didn't use mine. I was feeling froggy, so I leapt in head first.
8. wire cutters. I used mine to cut the electrical tape.
9. shrink tube. Can be used instead of tape.
Spiraling inward, additional items are:
10. donor USB cables.
11. razor knife.

Step 2: I'm Lucky, My Hub Has a Removable Cable!

Picture of I'm Lucky, My Hub Has a Removable Cable!

Step 3: Cut the Cables

Picture of Cut the Cables

Cut the two cables. Strip the sheath from them. Discard one of the ends opposite the A end, keeping the square A ends and one of the ends that goes into the hub.

Step 4: Connect the Wires

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Connect all three grounds together. This is usually the black wire.

Connect the positive wires, usually red, from the power cable and the piece going to the hub. DO NOT CONNECT THE RED FROM THE DATA CABLE. THIS COULD FRY SOMETHING! It might not, but it could. Clip the red wire from A end of data cable off.

Connect the other two wires as they were before you cut the cables, except do not connect those two wires to the power cable.

Tape or shrink tube things together.

Step 5: Mark the Power Cable

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I made a flag of electrical tape and cut out a small "+" so that I could keep it clear. any markings you like should be fine.

Step 6: Hook It Up

Picture of Hook It Up

Plug power cable into USB battery pack, or other USB charger. plug data cable into the hub and, in my case, the OTG cable. Plug whatever you need into the hub. Give it a go.
I hope this helps.
Be brutal in the comments, this is my first Instructable and I love adverse reactions.

Step 7:

Step 8: Luck Again! One of My Cables Was Power Only.

Picture of Luck Again! One of My Cables Was Power Only.

This was only lucky because it meant I didn't need to clip back any wires. If you are using two cables with four wires each, clip off the red, positive wire from the cable that will connect to the computer or OTG cable, in my case. Not pictured, clip back the white and green on the power cable

Step 9:

Comments

carlos66ba (author)2016-01-25

Nice, but can you also explain what the device is and the software you use in the phone?

b-b-boom (author)carlos66ba2016-01-25

The device is a DAB/FM/SDR peripheral that is used to tune TV in other countries. They're cheap $12 tuners that allow a computer, in this case a phone running Android, here a moto X, to receive radio frequencies from around 54 MHz up to around 1.7 GHz. The picture with the airplane is my phone decoding an ADS-B stream, which is a signal broadcast by most airplanes at 1090 MHz, giving their location, speed, heading, flight number, etc, using the app "ADS-B On Android Pro". The other picture with the spectrum, is " RF Analyzer " and it is showing a local FM radio broadcast station. These little dongles will give nerds and the curious nearly unlimited entertainment, learning about all the radio waves that fly through us every day.

seamster (author)2016-01-25

Your instructions are very clear. However, for those unfamiliar (like me) it's always helpful to explain what things like "rtl-sdr" are, perhaps in the intro. (That just saves a little googling for readers once you've got our eyes on your project.)

That's my only criticism. Great photos, and good text, so I hope to see more projects from you soon!

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