[450] I/Q and cheap Spectrum Analyzers

[David McKenzie]

ya i'm familiar with them are pretty cool. never really found a
practical use for it but cool never the less!

On Tue, Apr 3, 2012 at 10:06 PM, John Foege <john.foege at gmail.com> wrote:
> http://www.entropykey.co.uk/
>
> On Wed, Apr 4, 2012 at 4:02 AM, John Foege <john.foege at gmail.com> wrote:
>> Good call...yea there are lots of hardware RNGs around. I've got an Entropy key, which uses two reversed biased PN junctions (which creates an avlanche effect thusly generating random noise). It samples the random noise. The thing is damned cool. Just hang it onto a linux box, install the driver, and you've got an endless source of true randomness. All for like 30 bucks or something. Most places use it to keep their /dev/urandom generator stocked with enough high quality real entropy...
>>
>> Just sayin....its interesting
>> Sent from BlackBerry® from Vodafone
>>
>> -----Original Message-----
>> From: David McKenzie <k1fsy at vhfwiki.com>
>> Sender: 450-bounces at lists.vhfwiki.com
>> Date: Tue, 3 Apr 2012 21:47:07
>> To: 144.450 Mailing List<450 at lists.vhfwiki.com>
>> Reply-To: "144.450 Mailing List" <450 at lists.vhfwiki.com>
>> Subject: Re: [450] I/Q and cheap Spectrum Analyzers
>>
>> And if you do for some reason need a radiation source, go buy a smoke detector.
>>
>> On Tue, Apr 3, 2012 at 9:46 PM, David McKenzie <k1fsy at vhfwiki.com> wrote:
>>> you don't need a radioactive source, you can sample background
>>> radiation like sparkfun did with their 2012 free day for true
>>> randomness.
>>>
>>> On Tue, Apr 3, 2012 at 9:39 PM, John Foege <john.foege at gmail.com> wrote:
>>>> While the bulk emission of radioactive sources can be modeled
>>>> probabilistically via a poisson process, the individual emissions of
>>>> alpha, beta, gamma rays (whichever you fancy) are totally
>>>> non-deterministic and thus provide a fantastic source of real
>>>> randomness.
>>>>
>>>> And the fact that it's possible to build such a thing with crap
>>>> scrounged from old 1950s labs on ebay...that's the coolest part!
>>>>
>>>> On Wed, Apr 4, 2012 at 3:36 AM, John Foege <john.foege at gmail.com> wrote:
>>>>> My mind is too busy contemplating building a quantum random number
>>>>> generator to be of any use to you guys right now....
>>>>>
>>>>> 2kV PSU, scintillator, photomultiplier, some pulse shaping and
>>>>> sampling circuitry and voila...
>>>>>
>>>>> Where the f* am I going to get a radioactive source though? Anyone has
>>>>> some Cesium laying around? :P
>>>>>
>>>>> And the question that will indoubtedly be asked is, WHY? Why? Because
>>>>> science is damned interesting!
>>>>>
>>>>> On Wed, Apr 4, 2012 at 1:21 AM, Bob <n1ujs at toast.net> wrote:
>>>>>> Well get on board and help us out Mr. Technology!  We want a dongle device
>>>>>> which interfaces your PC with an rf sampler and allows you to measure
>>>>>> deviation, maybe even turns your PC into a scope and whatever else we can
>>>>>> add to it.  We need to make it and market it before anyone else does in a
>>>>>> package simple and cheap enough for the average ham.  Are you in?  We could
>>>>>> be rich!!!
>>>>>>
>>>>>> On Tue, Apr 3, 2012 at 10:52 AM, John Foege <john.foege at gmail.com> wrote:
>>>>>>>
>>>>>>> When I saw you guys (Bob and Dave) mentioning these things, I think it
>>>>>>> warmed my heart for a few milliseconds....
>>>>>>>
>>>>>>> :)
>>>>>>>
>>>>>>> Awesome indeed that you are starting to get as nerdy as me about the
>>>>>>> electronics....
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>>>>>>
>>>>>>
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