[aprssig] HackRF as SDR for ham use?

Jim Sanford wb4gcs at wb4gcs.org
Sun Aug 3 11:32:03 CDT 2014


I have used wireshark on a wireless connection.  There are things that 
it can do on a wired connection that it can't on wireless (at least the 
free version).

Good luck!
73,
Jim
wb4gcs at amsat.org

On 8/3/2014 11:32 AM, Chuck Gooden wrote:
> Greg,
>
> To capture and decode Wi-Fi traffic, down load a copy of wireshark at 
> http://www.wireshark.org.  There is a link for a 802.11 packet capture 
> but it is expensive.  wireshark is a very good tool that I use at work 
> and is very full featured.  I have never tried it on a wifi connection 
> but it will probably work, and if it doesn't its free so it wont cost 
> you anything.
>
> Chuck
>
>
> On 8/2/2014 11:00 PM, Greg D wrote:
>> Hi John,
>>
>> Non-Ham related question...  Professionally, I work in the Wi-Fi 
>> area, and was also interested in being able to use the HackRF for 
>> capturing and decoding Wi-Fi traffic, as well as getting a better 
>> look at the RF environment (spectrum analysis).  Can this be done 
>> with the available (free) software?
>>
>> Sounds like a really interesting and fun conference!
>>
>> Greg KO6TH
>>
>>
>> John Gorkos wrote:
>>> I'm at BlackHat right now, and just finished the first day of classes,
>>> hands on, with Michael Ossmann and the HackRF.  I've barely had any 
>>> time
>>> with it at all.  It has extremely low transmit power, and is classified
>>> as "test equipment" to avoid all of the FCC legalities for type
>>> certification.  I can tell you I've gotten 20MHz of bandwidth samples
>>> out of it, into a Linux VM on my MacBook pro, and it seems to be pretty
>>> slick.  Tomorrow will be more hands on with the device, and a LOT of
>>> time in GnuRadio.  Obviously, based on the fact that we're at BlackHat,
>>> most of the concentration is on security and penetration. Things like
>>> finding unknown signal types in a very large chunk of spectrum, then
>>> locating and identifying those signals.
>>>
>>> BTW, Michael is a real genius at explaining SDR techniques and the math
>>> behind them.  At the beginning of the class, he passed out little green
>>> plastic slinkys with his company logo on them.  Today, about halfway
>>> through the afternoon session, he used the slinkys to explain how a 
>>> sine
>>> wave and cosine wave look the same, depending on whether you're looking
>>> at them from the imaginary or real number point of view, and that the
>>> slinky represents the longitudinal axis of time extending out of the
>>> paper, as you plot complex numbers on a two axis system. Freaking
>>> brilliant.   If you ever get the opportunity to go to one of his
>>> classes, you'd be a fool to decline.
>>>
>>> I'll try to provide more info about the device tomorrow.  I'm mentally
>>> and physically drained after a day of complex math.
>>>
>>> John Gorkos
>>> AB0OO
>>>
>>>
>>> On 8/2/14, 6:13 PM, Greg D wrote:
>>>> Hi folks,
>>>>
>>>> I see there's a new SDR receiver being built for the "hacker"
>>>> community:  http://hakshop.myshopify.com/products/hackrf
>>>>
>>>> They claim it's compatible with SDR#, so I wonder how well it will 
>>>> work
>>>> for the variety of digital ham radio purposes?  It's a little 
>>>> pricy, but
>>>> claims to cover 10mhz to 6 ghz, so that would cover through our
>>>> 5.65-5.925ghz allocation.  I don't know what the bandwidth is.
>>>>
>>>> Useful?
>>>>
>>>> Thanks,
>>>>
>>>> Greg  KO6TH
>>>>
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>
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