tag:blogger.com,1999:blog-139924722024-03-23T13:14:26.987-05:00Philip A Covington’s BlogHere I will post information about the current status of SRL-LLC projects and other general SDR information. SRL-LLC website: www.srl-llc.comPhil Covingtonhttp://www.blogger.com/profile/14124688876731658917noreply@blogger.comBlogger74125tag:blogger.com,1999:blog-13992472.post-44369838357145377132019-04-30T18:10:00.000-05:002019-11-29T18:34:55.465-05:002323 Wilt<div class="separator" style="clear: both; text-align: center;">
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<br /><div class="blogger-post-footer">Software Defined Radio, Ham Radio, Electronics, USB, FPGA</div>Phil Covingtonhttp://www.blogger.com/profile/14124688876731658917noreply@blogger.com0tag:blogger.com,1999:blog-13992472.post-39254871305928538442019-03-29T18:20:00.000-05:002019-11-29T18:21:11.148-05:00Wilt Overview<div class="separator" style="clear: both; text-align: center;">
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<br /><div class="blogger-post-footer">Software Defined Radio, Ham Radio, Electronics, USB, FPGA</div>Phil Covingtonhttp://www.blogger.com/profile/14124688876731658917noreply@blogger.com0tag:blogger.com,1999:blog-13992472.post-41939348933197014932019-03-20T18:23:00.000-05:002019-11-29T18:24:59.871-05:00More Wilt<div class="separator" style="clear: both; text-align: center;">
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<br /><div class="blogger-post-footer">Software Defined Radio, Ham Radio, Electronics, USB, FPGA</div>Phil Covingtonhttp://www.blogger.com/profile/14124688876731658917noreply@blogger.com0tag:blogger.com,1999:blog-13992472.post-74749850615134271452017-12-01T18:14:00.000-05:002019-11-29T18:15:32.952-05:00San Diego<div class="separator" style="clear: both; text-align: center;">
<a href="https://1.bp.blogspot.com/-eK-6FrPzinA/XeGmW2L51aI/AAAAAAAAC5o/P_aVOQK1cSoSGS4ME1D29rDk8EFJMUJSwCKgBGAsYHg/s1600/IMG_0580_2048x1365.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="1067" data-original-width="1600" height="213" src="https://1.bp.blogspot.com/-eK-6FrPzinA/XeGmW2L51aI/AAAAAAAAC5o/P_aVOQK1cSoSGS4ME1D29rDk8EFJMUJSwCKgBGAsYHg/s320/IMG_0580_2048x1365.jpg" width="320" /></a></div>
<br /><div class="blogger-post-footer">Software Defined Radio, Ham Radio, Electronics, USB, FPGA</div>Phil Covingtonhttp://www.blogger.com/profile/14124688876731658917noreply@blogger.com0tag:blogger.com,1999:blog-13992472.post-43724282389814396442016-11-29T18:17:00.000-05:002019-11-29T18:18:06.182-05:00Forklift<div class="separator" style="clear: both; text-align: center;">
<a href="https://1.bp.blogspot.com/-9ocLkx-X9t8/XeGm-FeXVEI/AAAAAAAAC6I/fYBikaHCjtouShJbpygyOPjGx1Jqop3pwCKgBGAsYHg/s1600/2013-11-05" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="1200" data-original-width="1600" height="240" src="https://1.bp.blogspot.com/-9ocLkx-X9t8/XeGm-FeXVEI/AAAAAAAAC6I/fYBikaHCjtouShJbpygyOPjGx1Jqop3pwCKgBGAsYHg/s320/2013-11-05" width="320" /></a></div>
<br /><div class="blogger-post-footer">Software Defined Radio, Ham Radio, Electronics, USB, FPGA</div>Phil Covingtonhttp://www.blogger.com/profile/14124688876731658917noreply@blogger.com0tag:blogger.com,1999:blog-13992472.post-4100348931456390992014-10-07T06:04:00.000-05:002014-10-07T06:04:06.570-05:00Status Update<span style="font-family: Verdana, sans-serif;">QS1R Receivers are in stock ready for immediate shipment. An update to SDRMAX V is in the works also. We are working on some new products that will be available next year. There is no plans to discontinue the QS1R and it will be supported far into the future.</span><div class="blogger-post-footer">Software Defined Radio, Ham Radio, Electronics, USB, FPGA</div>Phil Covingtonhttp://www.blogger.com/profile/14124688876731658917noreply@blogger.com0tag:blogger.com,1999:blog-13992472.post-46327318648589230102013-01-28T08:48:00.000-05:002013-01-28T08:48:42.104-05:00[01.28.2013]<br />
<br />
USPS has raised its rates again on Domestic and International Priority Mail shipping. This seems to have become a yearly thing. The only upside is that it is still less expensive than UPS and FedEx for both domestic and international shipments.<br />
<br />
For the 2012 Christmas Holiday Season, we saw a surge in QS1R orders. By mid January 2013, we sold out of our current stock of QS1R receivers and have ordered another assembly quantity from our contract assembler. Luckily, there were no delays caused by parts shortages or back orders. We will begin shipping new QS1R RevD units from this new lot at the end of January 2013.<div class="blogger-post-footer">Software Defined Radio, Ham Radio, Electronics, USB, FPGA</div>Phil Covingtonhttp://www.blogger.com/profile/14124688876731658917noreply@blogger.com0tag:blogger.com,1999:blog-13992472.post-5071573673488923362012-07-25T17:36:00.000-05:002019-11-29T18:19:49.597-05:00Rumors and other nonsense...<br />
[07.25.2012]<br />
<br />
Recently I have seen this subject brought up again when it should have been put to rest a long time ago. There was a talented volunteer software developer (Cathy Moss of the UK) who developed a GUI software application for the QS1R (called Panoptos or SDRMAX III) who eventually stopped developing the software. There has been much speculation on why she left the project. These recent references to <span class="il">Cathy</span>
Moss, who volunteered to write a GUI that worked with my QS1R server,
demonstrates how ridiculous fabrications, gossip, and rumors can become.<div class="blogger-post-footer">Software Defined Radio, Ham Radio, Electronics, USB, FPGA</div>Phil Covingtonhttp://www.blogger.com/profile/14124688876731658917noreply@blogger.com0tag:blogger.com,1999:blog-13992472.post-72262350695189356372011-09-02T09:00:00.002-05:002011-09-02T09:00:47.442-05:00September 2, 2011<br />
<br />
News section has been added to the <a href="http://qs1r.wikispaces.com/News">QS1R Wiki</a><br />
<br />
<br /><div class="blogger-post-footer">Software Defined Radio, Ham Radio, Electronics, USB, FPGA</div>Phil Covingtonhttp://www.blogger.com/profile/14124688876731658917noreply@blogger.com0tag:blogger.com,1999:blog-13992472.post-7087627322485777142011-08-10T07:05:00.002-05:002011-08-10T07:06:33.090-05:00UpdatesFor updates and latest information on the QS1R Receiver please visit the QS1R Wiki at:
<br />
<br /><a href="http://qs1r.wikispaces.com/">http://qs1r.wikispaces.com/</a>
<br /><div class="blogger-post-footer">Software Defined Radio, Ham Radio, Electronics, USB, FPGA</div>Phil Covingtonhttp://www.blogger.com/profile/14124688876731658917noreply@blogger.com0tag:blogger.com,1999:blog-13992472.post-47627669477555242182010-07-05T08:19:00.000-05:002010-07-05T08:20:27.710-05:00QS1R Update<span style="font-family:Verdana;"><span style="color: rgb(153, 0, 0);"><span style="text-decoration: underline;">07-05-2010<br /> </span><span style="color: rgb(0, 0, 0);"><br /> <span style="text-decoration: underline;">QS1R STATUS:</span><br /> <br />QS1R Receivers are now shipping immediately upon ordering. The next version of software called SDRMAXIV is under development. The QS1T and RFFE1 designs are being integrated into the SDRMAXIV software. Development has started on a transciever board which includes an integrated DSP.</span></span></span><div class="blogger-post-footer">Software Defined Radio, Ham Radio, Electronics, USB, FPGA</div>Phil Covingtonhttp://www.blogger.com/profile/14124688876731658917noreply@blogger.com0tag:blogger.com,1999:blog-13992472.post-65970098939184382742009-12-21T17:36:00.001-05:002009-12-21T17:40:40.851-05:00SDR GUIsWPF = a natural for Software Defined Radio GUIs<br /><br />(stay tuned for further information)<div class="blogger-post-footer">Software Defined Radio, Ham Radio, Electronics, USB, FPGA</div>Phil Covingtonhttp://www.blogger.com/profile/14124688876731658917noreply@blogger.com0tag:blogger.com,1999:blog-13992472.post-32757102047692494592009-11-21T14:31:00.002-05:002009-11-21T14:34:16.383-05:00QS1R StatusQS1R Receivers are now shipping within 7-10 business days after order. The current revision of QS1R is RevD. The future QS1T Transmitter board and RFFE1 front end board are both still at the pre-production stage.<div class="blogger-post-footer">Software Defined Radio, Ham Radio, Electronics, USB, FPGA</div>Phil Covingtonhttp://www.blogger.com/profile/14124688876731658917noreply@blogger.com0tag:blogger.com,1999:blog-13992472.post-47297453693666550452009-05-05T09:19:00.004-05:002009-05-05T09:27:18.052-05:00Future projects, HPSDR, etc...<span style="color: rgb(153, 0, 0); font-weight: bold;">New QS Transceiver Projects:</span><br /><br /><http: com="" qs1r_latest="" documents="" pdf=""><a href="http://www.philcovington.com/qs1r_latest/Documents/QS_TRX_04_23_2009.pdf">http://www.philcovington.com/qs1r_latest/Documents/QS_TRX_04_23_2009.pdf</a><br /><http: com="" qs1r_latest="" documents="" pdf=""><br /><http: com="" qs1r_latest="" documents="" pdf=""><a href="http://www.philcovington.com/qs1r_latest/Documents/QS_Minimal_SARX.pdf">http://www.philcovington.com/qs1r_latest/Documents/QS_Minimal_SARX.pdf</a><br /><http: com="" qs1r_latest="" documents="" pdf=""><br /><http: com="" qs1r_latest="" documents="" pdf=""><a href="http://www.philcovington.com/qs1r_latest/Documents/QS_Antenna_Board.pdf">http://www.philcovington.com/qs1r_latest/Documents/QS_Antenna_Board.pdf</a><br /><br /><a href="http://www.philcovington.com/qs1r_latest/Documents/QS_Bus_Board.pdf">http://www.philcovington.com/qs1r_latest/Documents/QS_Bus_Board.pdf</a><br /><br /><a href="http://www.philcovington.com/qs1r_latest/Documents/QS_Display_Board.pdf">http://www.philcovington.com/qs1r_latest/Documents/QS_Display_Board.pdf</a><br /><br /><span style="color: rgb(153, 0, 0); font-weight: bold;">HPSDR:</span><br /><br />I am sad to say that I can no longer participate or support the HPSDR project. Please see<a href="http://hpsdr.org/why.html"> </a><http: org="" html=""><a href="http://hpsdr.org/why.html"> this </a>for an explanation as to why this is.</http:></http:></http:></http:></http:></http:><div class="blogger-post-footer">Software Defined Radio, Ham Radio, Electronics, USB, FPGA</div>Phil Covingtonhttp://www.blogger.com/profile/14124688876731658917noreply@blogger.com0tag:blogger.com,1999:blog-13992472.post-6320571366496054022009-02-03T09:25:00.018-05:002009-02-03T11:21:49.346-05:00RFFE1 Why you may (or may not) need itRFFE stands for "Radio Frequency Front End" and the "1" stands for the first version (0-62.5 MHz coverage). <br /><br />When I was designing the QS1R board, I had to decide whether to include bandpass filtering and RF amplification on the board. In fact the initial prototypes "RevA" included RF amplification on the QS1R board. Unlike another DDC based direct sampling receiver "Perseus", QS1R was designed to be more than a SW receiver. In addition to a SW receiver, QS1R was meant to facilitate experimentation in the RF spectrum up to at least 300 MHz. I finally settled on a 55 MHz low pass filter (which can be bypassed) and no active components in front of the ADC on QS1R. Any active devices, bandpass filters, or attenuation would be added by a separate board such as the RFFE1.<br /><br />The antenna that I use for my QS1R is a center fed, non-resonant dipole at 50 feet. The total wire length is about 240 feet with only about 100 feet of that running horizontally. It is fed with 450 ohm ladder line connected in the house to a 4:1 balun. The last 10 feet of feed line is coax to the QS1R from the balun. I do not use a tuner with this antenna for receiving. In my neighborhood, all of the utilities are under ground so the noise level is typical or maybe a bit less than the noise level of a suburban area. With this antenna and the QS1R, I find that band noise is always greater than the QS1R's noise floor until about 21 MHz. I arbitrarily have assumed (possibly incorrectly) that my antenna installation is average. Any amplification in front of the QS1R's ADC (below 21 MHz) is only a detriment in this case. The QS1R typically overloads at +9 to +10 dBm so amplification would degrade the strong signal handling capability of the receiver. The largest signal level that I have observed at my location has been about 0 dBm in the 0 - 62.5 MHz region. Contrary to what some may believe in the above case for the QS1R, bandpass filtering will improve nothing and, because BPFs typically have some loss, degrade the sensitivity slightly. As long as the atmospheric or band noise is greater than the noise floor and the signals levels in the 0 - 62.5 MHz region is below +9 dBm, bandpass filtering and/or amplification does not gain anything.<br /><br />By providing RF front end add-on boards such as the RFFE1, a front end (if even desired) can be tailored to the specific application of QS1R and will not impose a significant cost increase to the QS1R board for those who do not need the RFFE(1) boards. The QS1R is capable of under sampling up to ~ 500 MHz, so it will be possible to design RFFE(x) boards that will allow coverage up to ~ 500 MHz. For example, RFFE2 would provide low noise amplification, bandpass filtering, and attenuation of the range of 125 to 187.5 MHz ( including 2 meter ham band coverage). There is some interest by individuals in FM band Dxing which could be provided by a RFFE(x) board.<br /><br />The RFFE1 board is designed to fit within the existing QS1R Aluminum enclosure by replacing the front and rear end plates with new end plates (supplied with RFFE1). RFFE1 has switchable attenuation, two stages of switchable low noise amplification, and switchable filtering. It is controlled via the QS1R's I2C bus and derives its DC power from QS1R. The RF amplifiers provide up to 26 dB of gain (noise figure ~ 2 dB). With the attenuation switched in, the QS1R can handle signal levels up to +29 to +30 dBm without overload of the ADC. Each RF amplifier provides ~ 13 dB gain. With both amplifiers switched in and attenuation switched off, the QS1R can handle signal levels up to -17 dBm (or -4 dBm with one RF amp switched in) without overloading the ADC. The QS1R's IP3 is > +50 dBm so the RF amplification was designed to not degrade the IP3 excessively. With the amplifiers switched in, the IP3 is ~ +32 to + 33 dBm. Contrary to what some have speculated elsewhere, the RFFE1 does not use the LTC6400-20 ADC driver that HPSDR Mercury uses for a preamp. In HPSDR Mercury, the 20 dB amplification provided by the LTC6400-20 is always present - the preamp is bypassed by switching 20 dB of attenuation in front of the LTC6400 ADC driver providing a net gain of 0 dB. In the RFFE1, the two RF amplifiers are individually switchable in and out of line and have their own impedance matching and filtering networks for enhanced performance.<br /><br />With any amplification in front of the QS1R's ADC and without filtering, the whole 0 - 62.5 MHz region is amplified equally - so any signal within this range could possibly overload the ADC if its signal strength amplified by the gain of the RF amp exceeds +9 to +10 dBm. This is where band pass filtering is an advantage. It is not easy to design the filtering so that adequate attenuation is provided out of band as well as not degrading the IP3 performance of the receiver. Luckily we are not dealing with an analog radio, so the assumptions about exactly what is needed in a conventional receiver does not necessarily apply to direct sampling receivers such as the QS1R. I spent a very large amount of time in experimentation and testing to come up with a filtering system for RFFE1 that does not degrade IP3 performance. I was surprised in what I found and eventually decided on, but that is a subject for a future blog entry ;-). I did a lot of modeling of various filter networks to determine the RF current in each inductor given the physical and electrical characteristics of each type of inductor. This helped me chose the best filter arrangement and inductor type for the RFFE1 without degrading IP3 as much as other competing receiver's bandpass filters degrade IP3.<br /><br />So who needs a RFFE1? Here are my guesses:<br /><br />1. Anyone who wants to use QS1R above ~ 18 MHz with an average antenna system. This includes 10 and 6 meters.<br /><br />2. If your antenna is less efficient and you have determined that the noise floor of QS1R is above the band noise at some point below 18 MHz. An easy way to determine this is by disconnecting your antenna while watching the noise floor or s-meter in SDRMAX(II/III). If the noise floor increases by at least 6 dB when you reconnect your antenna then you have adequate sensitivity at that frequency.<br /><br />3. If your antenna does not provide a 25 - 75 ohm impedance to QS1R. Antennas that deviate far from 50 ohms will manifest as severely reduced sensitivity with QS1R. In my case with my non-resonant 450 ohm ladder line fed dipole, a 4:1 balun is all that is required for me to have adequate sensitivity up to about 21 MHz.<br /><br />4. Signal strengths in your location in the 0 - 62.5 MHz range exceeds +9 dBm at the antenna input to the QS1R receiver. In this case the switchable filtering and/or attenuation provided by RFFE1 will eliminate the overload. QS1R and SDRMAXII provides the nice capability of viewing 50 MHz of spectrum at once - it is easy to see the maximum signal levels your are receiving in that range.<br /><br />5. RFFE1 has two switchable antenna inputs as well as additional static/surge protection. RFFE1 also provides a connector for external receiver mute input, two protected general purpose IO lines, as well as an external connection to the QS1R I2C bus for external relay control and/or switching. While these options are not necessary for the functioning of QS1R, they are nice to have in some cases.<br /><br />Who does not need a RFFE1?<br /><br />1. If your operation is below ~18 MHz and your antenna system is adequate (see 2 and 3 above) and you have no overload problems (you don't see your "clip" LED on the front of QS1R illuminating) then you won't gain much with RFFE1. This generally includes using QS1R with transverters and for an IF receiver with other receivers/transceivers.<br /><br />Exact performance numbers for RFFE1 will be posted in the near future as well as pricing. Hint: The price of QS1R and RFFE1 together will not exceed the price of competing direct sampling receivers!<div class="blogger-post-footer">Software Defined Radio, Ham Radio, Electronics, USB, FPGA</div>Phil Covingtonhttp://www.blogger.com/profile/14124688876731658917noreply@blogger.com0tag:blogger.com,1999:blog-13992472.post-46758567506799144982008-07-16T05:59:00.001-05:002008-07-16T06:02:44.904-05:00SDR DiscussionPlease subscribe to the QS1R yahoo group at:<br /><br /><a href="http://groups.yahoo.com/group/qs1r/">http://groups.yahoo.com/group/qs1r/</a><br /><br />for the latest news and discussion on SDR topics and the QS1R.<br /><br />Regards,<br /><br />Phil N8VB<div class="blogger-post-footer">Software Defined Radio, Ham Radio, Electronics, USB, FPGA</div>Phil Covingtonhttp://www.blogger.com/profile/14124688876731658917noreply@blogger.com0tag:blogger.com,1999:blog-13992472.post-66374515095043429282008-01-30T08:57:00.000-05:002008-01-30T09:02:59.848-05:00Production QS1R RevC Pictures<span style="color: rgb(153, 0, 0);">QS1R Webpage is up:</span><br /><br /> <a href="http://www.philcovington.com/QuickSilver/">http://www.philcovington.com/QuickSilver/</a><br /><br />Orders for the first group of QS1Rs from assembly will be taken very soon. Please keep checking the website.<br /><br /><span style="color: rgb(153, 0, 0);">See the latest news at:</span><br /><br /> <a href="http://groups.yahoo.com/group/qs1r/">http://groups.yahoo.com/group/qs1r/</a><br /><br />Here is a picture of a production QS1R RevC board:<br /><br /><a onblur="try {parent.deselectBloggerImageGracefully();} catch(e) {}" href="http://www.philcovington.com/SDR/PICS/qs1r_revc_front_800_600.jpg"><img style="cursor: pointer; width: 400px;" src="http://www.philcovington.com/SDR/PICS/qs1r_revc_front_800_600.jpg" alt="" border="0" /></a><a onblur="try {parent.deselectBloggerImageGracefully();} catch(e) {}" href="http://www.philcovington.com/SDR/PICS/qs1r_revc_back_800_600.jpg"><img style="cursor: pointer; width: 400px;" src="http://www.philcovington.com/SDR/PICS/qs1r_revc_back_800_600.jpg" alt="" border="0" /></a><div class="blogger-post-footer">Software Defined Radio, Ham Radio, Electronics, USB, FPGA</div>Phil Covingtonhttp://www.blogger.com/profile/14124688876731658917noreply@blogger.com0tag:blogger.com,1999:blog-13992472.post-38188774328160413742007-12-31T19:23:00.002-05:002007-12-31T19:25:31.637-05:00QS1R Rev B Picture and new Yahoo group<a onblur="try {parent.deselectBloggerImageGracefully();} catch(e) {}" href="http://bp1.blogger.com/_7QZOYF2VU5U/R3mIJRhN7RI/AAAAAAAAACc/5phj_ooQUNA/s1600-h/PICT1761r.jpg"><img style="cursor: pointer;" src="http://bp1.blogger.com/_7QZOYF2VU5U/R3mIJRhN7RI/AAAAAAAAACc/5phj_ooQUNA/s400/PICT1761r.jpg" alt="" id="BLOGGER_PHOTO_ID_5150297341777800466" border="0" /></a><br /><br /><a href="http://groups.yahoo.com/group/qs1r/">http://groups.yahoo.com/group/qs1r/</a><div class="blogger-post-footer">Software Defined Radio, Ham Radio, Electronics, USB, FPGA</div>Phil Covingtonhttp://www.blogger.com/profile/14124688876731658917noreply@blogger.com0tag:blogger.com,1999:blog-13992472.post-39206265160043678772007-10-30T15:55:00.000-05:002007-10-30T15:56:01.286-05:00QS1R REVB Picture<a href="http://www.philcovington.com/SDR/PICS/qs1rt_revb.jpg">http://www.philcovington.com/SDR/PICS/qs1rt_revb.jpg</a><div class="blogger-post-footer">Software Defined Radio, Ham Radio, Electronics, USB, FPGA</div>Phil Covingtonhttp://www.blogger.com/profile/14124688876731658917noreply@blogger.com1tag:blogger.com,1999:blog-13992472.post-70588461204732936342007-10-30T10:45:00.000-05:002007-10-30T10:46:56.695-05:00History of HPSDR Mercury and Quick Silver<p class="MsoNormal" style="line-height: normal;"><b style=""><span style="font-size: 12pt;">History of HPSDR Mercury and Quick Silver<o:p></o:p></span></b></p> <p class="MsoNormal" style="line-height: normal;">Philip Covington, N8VB</p> <p class="MsoNormal"><u>Early HPSDR and XYLO<o:p></o:p></u></p> <p class="MsoNormal">In 2005 I started a High Performance SDR (HPSDR) project which was to consist of a motherboard carrying a FPGA/USB 2.0 interface and power supply with the provision for plug in modules through 40 pin headers.<span style=""> </span>I had planned a narrow band high dynamic range module based on a QSD/DDS/PCM4202 audio ADC and a wide bandwidth module based on a high speed 16 bit ADC: </p> <p class="MsoNormal"><a href="http://www.philcovington.com/SDR/PICS/HPSDR_FPGA_USB_Board_top1_800600.jpg">http://www.philcovington.com/SDR/PICS/HPSDR_FPGA_USB_Board_top1_800600.jpg</a></p> <p class="MsoNormal"><a href="http://www.philcovington.com/SDR/PICS/HPSDR_FPGA_USB_Board_top4.jpg">http://www.philcovington.com/SDR/PICS/HPSDR_FPGA_USB_Board_top4.jpg</a></p> <p class="MsoNormal">I soon selected the LTC2208 ADC from Linear Technology.<span style=""> </span>A representative from Linear Technology came across my blog (<a href="http://pcovington.blogspot.com/">http://pcovington.blogspot.com/</a> ) and offered evaluation boards and samples to support the project.<span style=""> </span></p> <p class="MsoNormal">At about the same time my HPSDR project came about, Phil Harman, VK6APH and Bill Tracey, KD5TFD were interested developing a sound card replacement to be used with the SDR-1000 and had started developing with a FPGA development board (XYLO) that had a high speed USB 2.0 interface.<span style=""> </span>They formed the XYLO SDR group to support this.<span style=""> </span>In March 2006, Phil Harman proposed that we merge my HPSDR project and XYLO SDR group into a common project since our goals were similar.<span style=""> </span>By the middle of March 2006 an announcement was made that the groups would merge and the HPSDR.org website was set up.</p> <p class="MsoNormal"><u>HPSDR ATLAS and OZY<o:p></o:p></u></p> <p class="MsoNormal">One of the first tasks was to define a backplane since various backplanes, such as passive PCI, were being proposed.<span style=""> </span>I volunteered for the task which became the ATLAS backplane:</p> <p class="MsoNormal"><a href="http://www.philcovington.com/HPSDR/ATLAS/REVA/atlas_1_REVA_BW.pdf">http://www.philcovington.com/HPSDR/ATLAS/REVA/atlas_1_REVA_BW.pdf</a></p> <p class="MsoNormal"><a href="http://www.philcovington.com/HPSDR/ATLAS/ALPHA/Atlas_assy.pdf">http://www.philcovington.com/HPSDR/ATLAS/ALPHA/Atlas_assy.pdf</a></p> <p class="MsoNormal">We had an early volunteer to design an ATLAS plug-in FPGA/USB board to replace the XYLO board, but unfortunately the volunteer was not able to follow through with the task.<span style=""> </span>I agreed to do the design for this board which became the HPSDR OZY board and to provide for the possibility of controlling a SDR-1000 through the OZY’s IO ports that simulate a PC parallel port:</p> <p class="MsoNormal"><a href="http://www.philcovington.com/SDR/OZYREVA.jpg">http://www.philcovington.com/SDR/OZYREVA.jpg</a></p> <p class="MsoNormal"><u>Early HPSDR Mercury<o:p></o:p></u></p> <p class="MsoNormal">Soon after the OZY design was done I began to pursue Mercury.<span style=""> </span>I initially used the Linear Technology supplied evaluation board for the LTC2208.<span style=""> </span>In May of 2006 I became very busy with a work project so I asked Phil Harman if he would like me to send him one of my LTC2208 evaluation boards to play with.<span style=""> </span>I also sent Phil a Crystek low phase noise crystal oscillator that I had chosen as a candidate for driving the encode clock of the LTC2208 ADC.<span style=""> </span>In the link below you can see the Mercury breadboard connected to the OZY.<span style=""> </span>The LTC2208 evaluation board can be seen plugged in vertically to the breadboard with the RG 174/U cable running to the top of it:</p> <p class="MsoNormal"><a href="http://hpsdr.org/wiki/index.php?title=Image:OZY_MERC_TEST.JPG">http://hpsdr.org/wiki/index.php?title=Image:OZY_MERC_TEST.JPG</a></p> <p class="MsoNormal"><u>Quick Silver Version 1<o:p></o:p></u></p> <p class="MsoNormal">In late 2006 I decided to design a board that I called Quick Silver (related to Mercury) which would become the initial prototype for HPSDR Mercury:</p> <p class="MsoNormal"><a href="http://www.philcovington.com/SDR/PICS/QS1R_proto.JPG">http://www.philcovington.com/SDR/PICS/QS1R_proto.JPG</a></p> <p class="MsoNormal"><a href="http://www.philcovington.com/SDR/QS1RA_12012006.pdf">http://www.philcovington.com/SDR/QS1RA_12012006.pdf</a></p> <p class="MsoNormal">The initial thought about the design of HPSDR Mercury was that it would use either an Analog Devices AD6636 or AD6620 Digital Receive Signal Processor chip.<span style=""> </span>The ADC6636 was only available in BGA packaging so I chose to use two AD6620 DDCs on the Quick Silver (also called QS1R REV AB).<span style=""> </span>I wanted to investigate whether the AD6620/6636 was suitable for use with the LTC2208 in a HF receiver and also to test the choice of low noise Crystek oscillator encode circuitry which would be critical in determining the LTC2208 ADC’s performance.</p> <p class="MsoNormal">It quickly became clear that the AD6620/6636 devices were not suitable from a dynamic range perspective for use in the HPSDR Mercury.<span style=""> </span>About 90% of the DDC functionality was moved from the AD6620 into the Cyclone II FPGA on the QS1R REV AB prototype.<span style=""> </span>There was not enough room in the FPGA to implement a useful final FIR compensating filter to correct for the passband droop of the CIC filters used in the FPGA implemented DDC.<span style=""> </span>I then investigated using two external FIR filter chips made by a company called QuickFilter Technologies:</p> <p class="MsoNormal"><a href="http://www.quickfiltertech.com/files/QF1D512%20SavFIRe%20Datasheet.pdf">http://www.quickfiltertech.com/files/QF1D512%20SavFIRe%20Datasheet.pdf</a></p> <p class="MsoNormal">Two of these chips were soon grafted on the QS1R board in place of the AD6620 parts for testing.<span style=""> </span>These chips worked very well but I was concerned about their availability.<span style=""> </span>I made a decision at that point to “bite the bullet” and wrote a one-tap-per-clock FIR filter in Verilog to move all of the DDC functionality into the FPGA.<span style=""> </span>I was easily able to fit two 256 tap FIR filters into the remaining space in the Cyclone II FPGA which eliminated the need for the external QuickFilter FIR chips.<span style=""> </span>During this time Altera also announced the availability of the Cyclone III FPGA in a QFP240 package with enough logical elements and hardware multipliers to be very interesting to SDR work – this also prompted me to develop the one-tap-per-clock FIR filter in Verilog since space would no longer be a concern with this FPGA.</p> <p class="MsoNormal">The QS1R REV AB prototype allowed me to also test a Hittite HMC472 0-31.5 dB attenuator, a Sirenza SBF-4089/5089 RF Amp, Phil Harman’s 1.5 MHz BPF stage, and a 30/60 MHz LPF stage that is planned to be used in the HPSDR Mercury design.</p> <p class="MsoNormal">The Quick Silver was the testing grounds for ideas that will be used in HPDSR Mercury.<span style=""> </span>Without experience gained from the QS1R REV AB prototype,<span style=""> </span>we would have probably ended up with multiple alpha releases of the Mercury as we found these problems later.</p> <p class="MsoNormal"><u>Quick Silver QS1RT VERB<o:p></o:p></u></p> <p class="MsoNormal">During the development and testing of the QS1R REV AB prototype, the Altera Cyclone III FPGA became available in a QFP240 package with enough logical elements to do some interesting SDR work.<span style=""> </span>I wanted to investigate using a PCI or PCIe connection to the PC to allow much wider bandwidths to be processed than the USB 2.0 interface would allow.<span style=""> </span>This is how QS1RT VERB came about.<span style=""> </span>The VERB contains both the LTC2208 ADC and a TxDAC with a fiber optic or copper connection to a PCI/PCIe board in a PC.<span style=""> </span>The high speed serial interface between the QS1RT and the PCI/PCIe card in the PC is made by a TI TLK2711 Serializer/Deserializer chip that transfers at 2.5 GbPS:</p> <p class="MsoNormal"><a href="http://www.philcovington.com/SDR/PICS/QS1RT_VERB_MED.JPG">http://www.philcovington.com/SDR/PICS/QS1RT_VERB_MED.JPG</a></p> <p class="MsoNormal">As of October 2007, I am in the process of testing the PCI end of the interface.<span style=""> </span>This board uses some expensive components and is only really meant to be a demonstration of a high speed interface and for experimentation.<span style=""> </span>I want to investigate the ultimate achievable bandwidth to the PC from the VERB and also configuration of the FPGA over the high speed fiber optic link.</p> <p class="MsoNormal"><u>Quick Silver QS1R REVB<o:p></o:p></u></p> <p class="MsoNormal">Taking what I learned from QS1R REV AB prototype and QS1RT VERB, I set about designing a third (and hopefully final!) iteration of the Quick Silver board in October 2007.<span style=""> </span>In previous boards, the RF section of the PCB was routed by hand and the digital sections were done by an auto router.<span style=""> </span>In QS1R REVB, all routing was done by hand to optimize trace lengths and minimize vias in the digital sections of the circuit.<span style=""> </span>The board was simplified with applications such as a HF receiver, VNA, spectrum analyzer, and digital oscilloscope in mind:</p> <p class="MsoNormal"><a href="http://www.philcovington.com/SDR/qs1r_10112007.pdf">http://www.philcovington.com/SDR/qs1r_10112007.pdf</a></p> <p class="MsoNormal"><a href="http://www.philcovington.com/SDR/qs1r_revb_sch.pdf">http://www.philcovington.com/SDR/qs1r_revb_sch.pdf</a></p> <p class="MsoNormal">Included on the board is a 192 kSPS Stereo DAC for audio output.<span style=""> </span>There are provisions to allow an expansion BPF/RF AMP/Attenuator board, an on-board 55 MHz LPF, a direct ADC input connector that bypasses the LPF, an I2C control bus, etc…<span style=""> </span>See the schematic above for details.</p> <p class="MsoNormal">The QS1R REV B PCB is completed, assembled, and now undergoing testing as of October 30, 2007.</p><div class="blogger-post-footer">Software Defined Radio, Ham Radio, Electronics, USB, FPGA</div>Phil Covingtonhttp://www.blogger.com/profile/14124688876731658917noreply@blogger.com1tag:blogger.com,1999:blog-13992472.post-40269543004500661122007-08-15T08:00:00.001-05:002007-08-15T08:03:42.864-05:00QS1RT Soldered<span style="color: rgb(204, 0, 0);">QS1RT VERB Soldered:</span><br /><br /><div style="text-align: center;"><a onblur="try {parent.deselectBloggerImageGracefully();} catch(e) {}" href="http://www.philcovington.com/SDR/PICS/QS1RT_VERB_LARGE.JPG"><img style="cursor: pointer; width: 400px;" src="http://www.philcovington.com/SDR/PICS/QS1RT_VERB_SM.JPG" alt="" border="0" /></a><br /></div><br /><div style="text-align: center;"><a href="http://www.philcovington.com/SDR/PICS/QS1RT_VERB_LARGE.JPG"><span style="font-size:85%;">(Click on picture above for a larger version)</span></a><br /><br /></div><div class="blogger-post-footer">Software Defined Radio, Ham Radio, Electronics, USB, FPGA</div>Phil Covingtonhttp://www.blogger.com/profile/14124688876731658917noreply@blogger.com3tag:blogger.com,1999:blog-13992472.post-14800219213543783882007-07-20T18:33:00.001-05:002007-07-20T18:37:14.541-05:00QS1RT VERB Bare PCB<div style="text-align: center;"><a onblur="try {parent.deselectBloggerImageGracefully();} catch(e) {}" href="http://www.philcovington.com/SDR/PICS/QS1RT_A.jpg"><img style="cursor: pointer; width: 400px;" src="http://www.philcovington.com/SDR/PICS/QS1RT_800.jpg" alt="" border="0" /></a><br /><br />(Click on picture above to see larger version)<br /><br /><span style="color: rgb(153, 0, 0);">Boards were received 07-20-2004<br /><br /><br /></span></div><div class="blogger-post-footer">Software Defined Radio, Ham Radio, Electronics, USB, FPGA</div>Phil Covingtonhttp://www.blogger.com/profile/14124688876731658917noreply@blogger.com0tag:blogger.com,1999:blog-13992472.post-52313208999358061162007-07-12T08:31:00.002-05:002007-07-12T09:28:37.112-05:00QS1RT VERB PCB<span style="color: rgb(153, 0, 0); font-weight: bold;">QS1RT VERB (VErsatile Radio Board) Project:</span><br /><br /><a onblur="try {parent.deselectBloggerImageGracefully();} catch(e) {}" href="http://www.philcovington.com/SDR/PICS/QS1RTVERB.gif"><img style="cursor: pointer; width: 400px;" src="http://www.philcovington.com/SDR/PICS/QS1RTVERBsm.gif" alt="" border="0" /></a><br /><br /><div style="text-align: center;"><div style="text-align: left;"> <span style="font-size:85%;"> (Click on picture above for a larger version)</span><br /></div><div style="text-align: left;"><br />ADC: <a href="http://www.linear.com/pc/productDetail.jsp?navId=H0,C1,C1155,C1001,C1150,P13693">Linear Technology LTC2208</a><br />DAC: <a href="http://www.analog.com/en/prod/0,,AD9744,00.html">Analog Devices AD9744</a><br />CODEC: <a href="http://focus.ti.com/lit/ds/symlink/tlv320aic23b.pdf">TI TLV320AIC23B</a><br />FPGA: Altera EP3C25-QFP240 Cyclone III<br />CPLD: Altera EMP240-QFP100 MAX II<br />USB: <a href="http://download.cypress.com.edgesuite.net/design_resources/datasheets/contents/cy7c68013a_8.pdf">Cypress CY7C68013A FX2</a><br />SERDES: <a href="http://focus.ti.com/lit/ds/symlink/tlk2701.pdf">TI TLK2701</a><br />EEPROM: Microchip 24C128<br /><br /><ul><li>Internal encode clock is 125 MHz.</li><li>Board interface is through:</li></ul><ol><ol><li>USB 2.0 or,<br /></li><li>Optic Fiber SFP Module at 2.5 Gbps or,<br /></li><li>Copper Cat6 cable at 2.5 Gbps.</li></ol></ol><ul><li>TI CODEC provides 48/96kHz audio in and audio out</li><li>FPGA can be programmed via USB or Fiber/Copper interface in Fast Parallel Programming mode (byte wide transfers per clock cycle).</li><li>JTAG interface for FPGA and CPLD</li><li>Connectors:</li><ul><li>ADC IN</li><li>DAC OUT</li><li>EXT ENCODE IN</li><li>MIC IN</li><li>L&R AMPLIFIED AUDIO OUT</li><li>L&R LINE IN</li><li>L&R LINE OUT</li><li>DC POWER IN</li><li>JTAG</li><li>USB 2.0</li><li>RJ45 (2.5 Gbps serial over copper)</li><li>SFP (2.5 Gbps serial over fiber)</li><li>TTL Level Serial from FX2</li><li>SPI and I2C to RF external RF board</li></ul></ul><span style="color: rgb(255, 0, 0); font-weight: bold;">Status:</span> Prototype boards are scheduled to arrive from PCB manufacturer on July 19th.<br /><br /><span style="color: rgb(153, 0, 0); font-weight: bold;">RF Front End/BPF Board:</span><br />An external RF board will determine the frequency range and will allow home-brew RF front ends. The QS1RT VERB provides an SPI and I2C bus for controlling the RF front end board.<br /><br /><span style="font-weight: bold; color: rgb(153, 0, 0);">2.5 Gbps Serial Link:</span><br />The other end of the 2.5 Gbps interface will be a PCI and PCI Express board for the PC. This interface board will have a matching TI TLK2701 SERDES, a CYCLONE II EP3C25, a TI CODEC, and a PLX PCI or PCIe-to-local bus interface chip. The two boards can be connected by Cat6 copper or optical fiber through the SFP module interface.<br /><br />The USB 2.0 interface allows the use of the QS1RT VERB with PC laptops or if the copper/fiber interface is not desired.<br /><br />The ADC IN and DAC OUT ports are transformer coupled using <a href="http://www.minicircuits.com/pdfs/T1-6T-KK81.pdf">Minicircuits T1-6T</a> transformers which gives 15 kHz to 300 MHz coverage. The external RF front end board will determine the actual frequency coverage of the system.<br /><br />I am having good luck with <a href="http://www.picolight.com/UserFiles/PDF/05001369%20R2.pdf">Picolight SFP</a> modules for the fiber interface which cost about $50 each. I have successfully tested the optical interface though 100 meters of fiber.<br /><br /><br /></div></div><div class="blogger-post-footer">Software Defined Radio, Ham Radio, Electronics, USB, FPGA</div>Phil Covingtonhttp://www.blogger.com/profile/14124688876731658917noreply@blogger.com0tag:blogger.com,1999:blog-13992472.post-82876231052987151032007-06-27T09:21:00.002-05:002007-06-27T09:39:30.261-05:00QS1RT Prototype 06272007<div style="text-align: left;"><span style="text-decoration: underline;"></span><span style="color: rgb(204, 0, 0); font-weight: bold;">QS1RT:</span><br /><br /></div>Please click on the image to see a larger version.<br /><br /><a onblur="try {parent.deselectBloggerImageGracefully();} catch(e) {}" href="http://www.philcovington.com/SDR/PICS/qs1rt_06272007.gif"><img style="cursor: pointer; width: 400px;" src="http://www.philcovington.com/SDR/PICS/qs1rt_06272007_sm.gif" alt="" border="0" /></a><div class="blogger-post-footer">Software Defined Radio, Ham Radio, Electronics, USB, FPGA</div>Phil Covingtonhttp://www.blogger.com/profile/14124688876731658917noreply@blogger.com2tag:blogger.com,1999:blog-13992472.post-27031731974221882842007-06-19T08:16:00.000-05:002007-06-19T08:32:52.311-05:00TI PCM4222 ADC Now Available<span style="color: rgb(153, 0, 0);">PCM4222:<br /><br /><span style="color: rgb(0, 0, 0);">TI's 24 bit, 216 kHz, 2 channel ADC is now available. 122 dB dynamic range is claimed. The part comes in a 48 pin TQFP package. It is available from Digi-Key in single quantities at $22.42 each.<br /><br />Here is the link: <a href="http://focus.ti.com/docs/prod/folders/print/pcm4222.html">PCM4222</a><br /><br />This is a FFT plot of the PCM4222 at 192 kHz with no input:<br /><br /></span></span><a onblur="try {parent.deselectBloggerImageGracefully();} catch(e) {}" href="http://bp2.blogger.com/_7QZOYF2VU5U/RnfZREMhNbI/AAAAAAAAAA8/MJlr7sGgppw/s1600-h/ScreenShot001.gif"><img style="cursor: pointer;" src="http://bp2.blogger.com/_7QZOYF2VU5U/RnfZREMhNbI/AAAAAAAAAA8/MJlr7sGgppw/s400/ScreenShot001.gif" alt="" id="BLOGGER_PHOTO_ID_5077765992090777010" border="0" /></a><br />The rise in amplitude at about 65 kHz is a concern, but for SDR use a bandwidth of 130 kHz would still be useful. <br /><br />The <a href="http://focus.ti.com/lit/ds/symlink/pcm4222.pdf">PCM4222</a> is definitely easier to get in single quantities for experimenters than the AKM <a href="http://www.asahi-kasei.co.jp/akm/en/product/ak5394a/ak5394a.html">AK5394</a> is, but the AKM chip is still probably the winner.<br /><br /><span style="color: rgb(153, 0, 0);"><span style="color: rgb(0, 0, 0);"><br /><br /></span></span><div class="blogger-post-footer">Software Defined Radio, Ham Radio, Electronics, USB, FPGA</div>Phil Covingtonhttp://www.blogger.com/profile/14124688876731658917noreply@blogger.com0