[chbot] OT: SDR

[André Geldenhuis]

Hi Richard

We are using one of these cheap rtl2832's and a funcube to track our
balloon flight tomorrow (all going well :P )  If you wanted a good range
test of your SDR, receiver swing your yagi towards lake clearwater after
10am tomorrow at 433.945 - 433.950 MHz ish.  Transmitter is running at a
bit less than 10mW and the encoding scheme is DominoEX4 in plain text.

We also have a spot gps tracker running on board accessible here:
http://goo.gl/1o6o6  password microprize.  A track starting near lake
clearwater indicates we are setting up, once the track starts moving the
balloon is up.  Predicted altitude is just shy of 100 000 feet based on
estimated burst diameters from other who have used the same balloons but
there is a lot of variability in these old surplus balloons.

I'll send some pictures to the list if we get the payload back :P

Cheers
Andre

On Wed, Jan 2, 2013 at 11:07 AM, Richard Jones <rjtp at ihug.co.nz> wrote:

> Note I have changed the subject to OT: SDR to help archive browsing.
>
> In response to ' talk with anyone about SDR in more detail'...
>
> I bought the now obsolete dx.com rtl2832 + E4000 chips a while ago for
> experimentation, I also have ordered some rtl2832+R820T receivers which
> promise to be a little more sensitive, currently available, and cheaper at
> $14.
>
> Using the
> https://www.cgran.org/browser/projects/multimode/trunk/multimode.grcreceiver and gnu radio companion I cobbled together a nbfm digital mobile
> radio receiver to receive DMR transissions which are 2 slot TDMA. Adding a
> mixer to the front end I could simultaneously decode multiple transmit and
> receive frequencies used in a wired trunked radio network site. All this
> with exact relative timing, but limited dynamic range.
>
> Over Christmas I finally got around to using the RTL2832 for DVB-T
> reception, their original purpose. I can now record and replay digital TV
> on my laptop using ubuntu 12.04 and keffeine, next stop mythtv. The delay
> in getting around this was caused by needing a newer linux kernel and the
> upgrade was finally prompted by a dying HDD in my laptop. Ubuntu 12.04
> kaffeine requires an updated channel list for sugarloaf, I found this
> useful info somewhere on the web :
> # T freq bw fec_hi fec_lo mod transmission-mode guard-interval hierarchy
> #
> # Multiplex TVNZ, UHF channel 34
> T 578000000 8MHz 3/4 NONE QAM64 8k 1/16 AUTO
> #  Multiplex TVWorks, UHF Channel 32
> T 562000000 8MHz 3/4 NONE QAM64 8k 1/16 AUTO
> # Multiplex Kordia, UHF Channel 36
> T 594000000 8MHz 3/4 NONE QAM64 8k 1/16 AUTO
>
> The next application to try will be ADS-B aircraft transponder display
> that Stuart Brown showed me, but I think the best apps are currently
> available for Windows and my 4 year old Windows OS backup CDs don't read at
> the moment, and I'm not exactly keen to pay again for something I already
> paid for.
>
> Anyone else have info to share on Software Defined Radio activities?
>
> Richard
>
> On Tue, Jan 1, 2013 at 2:04 PM, Dave Bracken <dave.bracken at gmail.com>wrote:
>
>> Hi,
>> I'm also interested in SDR and bought an RTL2832 based dongle recently
>> and am considering buying a HF converter soon.
>>
>> http://www.ebay.co.uk/itm/Ham-It-Up-v1-0-RF-Upconverter-For-SDR-Funcube-RTLSDR-MF-HF-Converter-E4000-/150917110538?pt=UK_Computing_Other_Computing_Networking&hash=item23235c5b0a
>> which is an opensource project the details of which can be found on
>> http://code.google.com/p/opendous/wiki/Upconverter
>>
>> When I get it up and running, I'll let you know.
>>
>> Dave.
>>
>>
>> On 19 December 2012 14:22, Solor Vox <solorvox at epic.geek.nz> wrote:
>> > Hi all,
>> >
>> > Just wanted to post a follow up for those that wanted to talk more about
>> > Laser cutting.
>> >
>> > My personal blog with some examples is at:
>> > http://epic.geek.nz/
>> >
>> > Or you can see my shop with items for sale at
>> > http://www.zebracraft.co.nz/
>> >
>> > I'm also keen to talk with anyone about SDR in more detail as I'm just
>> > getting started with it.  Currently I'm planning on construction of a
>> > quarter wave discone antenna with a low end of 80Mhz.
>> >
>> > Cheers
>>
>
>
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