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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>You are correct that the 2177/78 are not the chip of choice, but SiLABs offers some very interesting choices like the 2158 which does sport an analog output. I should be more careful in my exuberance…<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><a href="http://www.silabs.com/Support%20Documents/TechnicalDocs/Si2158-short.pdf">http://www.silabs.com/Support%20Documents/TechnicalDocs/Si2158-short.pdf</a><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Pictures of a simple effective modification to an EzTV645. This modification made a big improvement in its (noise) performance.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><a href="http://www.salsburg.com/ezcap/">http://www.salsburg.com/ezcap/</a><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> osmocom-sdr-bounces@lists.osmocom.org [mailto:osmocom-sdr-bounces@lists.osmocom.org] <b>On Behalf Of </b>Nick Foster<br><b>Sent:</b> Saturday, September 21, 2013 6:40 PM<br><b>To:</b> Jay Salsburg<br><b>Cc:</b> osmocom-sdr@lists.osmocom.org<br><b>Subject:</b> RE: new TV Tuner Chip, the Si2177<o:p></o:p></span></p></div><p class=MsoNormal><o:p> </o:p></p><p>As others have tried to explain, this chip does not provide an analog output for you to digitize with your soundcard. It turns RF into H.264 digital video. That's all. There's nothing to digitize and no place to plug your soundcard into.<o:p></o:p></p><p>--n<o:p></o:p></p><div style='border:none;border-left:solid #CCCCCC 1.0pt;padding:0in 0in 0in 6.0pt;margin-left:4.8pt'><p class=MsoNormal style='margin-bottom:12.0pt'>What is all this talk about USB. High-end Audio Interfaces digitize/quantize<br>at 192KHz/24bit. Since these new Tuners are almost naked on a surface mount<br>board, all that is needed other than a good audio card is a BusPirate to<br>control the I2C to get one of these new Analog TV tuner Chips to work as a<br>SDR. Since most "Intelligence" in radio is narrow band typically a Voice<br>Channel, all that a wideband A/D gives you is a view from 50,000 feet of the<br>spectrum which is OK for Test and Measurement. I cannot use my TV Dongles<br>for most of my (Forward Scatter RADAR) applications because of their low<br>resolution, I must use a conventional Scanner because it converts the signal<br>to Audio. What I need is high definition and narrow band, the current<br>Dongles are typically Wide Band low resolution (2Mhz/8bit). This is why a<br>Tuner Chip with low noise and demodulated analog output is attractive to me,<br>it is a complete solution.<br><br>-----Original Message-----<br>From: <a href="mailto:osmocom-sdr-bounces@lists.osmocom.org">osmocom-sdr-bounces@lists.osmocom.org</a><br>[mailto:<a href="mailto:osmocom-sdr-bounces@lists.osmocom.org">osmocom-sdr-bounces@lists.osmocom.org</a>] On Behalf Of Leif Asbrink<br>Sent: Saturday, September 21, 2013 4:38 PM<br>To: <a href="mailto:osmocom-sdr@lists.osmocom.org">osmocom-sdr@lists.osmocom.org</a><br>Subject: Re: new TV Tuner Chip, the Si2177<br><br>Hi Adam,<br><br>> > > The bandwidth of the I/Q pair is too large to be transmitted over<br>> > > USB for the reception of TV signals. After demodulation the<br>> > > bandwidth is lower so it would (marginally) fit an USB interface<br>> > > if we talk about traditional analogue TV. For digital TV the<br>> > > bandwidth reduction by the decoder is much larger.<br>><br>> Is that correct? From what I can find, an analogue TV signal has a<br>> bandwidth of around 6-8MHz.<br>Yes.<br><br>> The HackRF is an SDR that works over<br>> USB2.0 and can capture a chunk of RF spectrum up to 20MHz, which<br>> should be ample for one analogue (or even digital) TV signal, perhaps<br>> even two if the channels are close enough together.<br><br>I was under the impression that the USB channel was the reason that the<br>highest sampling rate I was aware of in continous mode is 4 MHz<br>(QS1R) Now, I did not think of the fact that for the dongle we need only 8<br>bit while normal SDRs use 16 bit so with my assumption the maximum sampling<br>speed would be 8 MHz. To receive 6-8 MHz bandwidth one would need to sample<br>quite a bit higher. Surely one could apply digital filters but even so a,<br>substantial amount of oversampling is needed.<br><br>Are you sure HackRF really can send 20 MHz of bandwidth over USB 2.0<br>continously? Where did you find that info? (Seems I should try to push SDR<br>manufacturers who use USB 2.0 to supply modes with higher sampling rates...)<br><br>73<br><br>Leif<br><br>-----<br>No virus found in this message.<br>Checked by AVG - <a href="http://www.avg.com" target="_blank">www.avg.com</a><br>Version: 2013.0.3408 / Virus Database: 3222/6687 - Release Date: 09/21/13<br><br><o:p></o:p></p></div><div class=MsoNormal align=center style='text-align:center'><hr size=1 width="100%" noshade style='color:#A0A0A0' align=center></div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>No virus found in this message.<br>Checked by AVG - <a href="http://www.avg.com">www.avg.com</a><br>Version: 2013.0.3408 / Virus Database: 3222/6688 - Release Date: 09/21/13<o:p></o:p></p></div></body></html>