[aprssig] HackRF as SDR for ham use?

Chuck Gooden Chuck.Gooden at comcast.net
Sun Aug 3 10:32:10 CDT 2014


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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