Note I have changed the subject to OT: SDR to help archive browsing.<br><br>In response to ' talk with anyone about SDR in more detail'...<br><br>I bought the now obsolete <a href="http://dx.com">dx.com</a> 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.<br>
<br>Using the <a href="https://www.cgran.org/browser/projects/multimode/trunk/multimode.grc">https://www.cgran.org/browser/projects/multimode/trunk/multimode.grc</a> receiver 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.<br>
<br>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 :<br>
# T freq bw fec_hi fec_lo mod transmission-mode guard-interval hierarchy<br>#<br># Multiplex TVNZ, UHF channel 34<br>T 578000000 8MHz 3/4 NONE QAM64 8k 1/16 AUTO<br># Multiplex TVWorks, UHF Channel 32<br>T 562000000 8MHz 3/4 NONE QAM64 8k 1/16 AUTO<br>
# Multiplex Kordia, UHF Channel 36<br>T 594000000 8MHz 3/4 NONE QAM64 8k 1/16 AUTO<br><br>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.<br>
<br>Anyone else have info to share on Software Defined Radio activities?<br><br>Richard<br><br><div class="gmail_quote">On Tue, Jan 1, 2013 at 2:04 PM, Dave Bracken <span dir="ltr"><<a href="mailto:dave.bracken@gmail.com" target="_blank">dave.bracken@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hi,<br>
I'm also interested in SDR and bought an RTL2832 based dongle recently<br>
and am considering buying a HF converter soon.<br>
<a href="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" target="_blank">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</a><br>
which is an opensource project the details of which can be found on<br>
<a href="http://code.google.com/p/opendous/wiki/Upconverter" target="_blank">http://code.google.com/p/opendous/wiki/Upconverter</a><br>
<br>
When I get it up and running, I'll let you know.<br>
<br>
Dave.<br>
<br>
<br>
On 19 December 2012 14:22, Solor Vox <<a href="mailto:solorvox@epic.geek.nz">solorvox@epic.geek.nz</a>> wrote:<br>
> Hi all,<br>
><br>
> Just wanted to post a follow up for those that wanted to talk more about<br>
> Laser cutting.<br>
><br>
> My personal blog with some examples is at:<br>
> <a href="http://epic.geek.nz/" target="_blank">http://epic.geek.nz/</a><br>
><br>
> Or you can see my shop with items for sale at<br>
> <a href="http://www.zebracraft.co.nz/" target="_blank">http://www.zebracraft.co.nz/</a><br>
><br>
> I'm also keen to talk with anyone about SDR in more detail as I'm just<br>
> getting started with it. Currently I'm planning on construction of a<br>
> quarter wave discone antenna with a low end of 80Mhz.<br>
><br>
> Cheers<br></blockquote></div><br>