Home I am a simple enthusiast attempting to convey my love and enjoyment of radio, electronics, and computing and perhaps to inspire YOU to build something too. http://hanssummers.com/home.feed 2018-06-22T15:36:23Z Joomla! 1.5 - Open Source Content Management Hans Summers Homebrew Radio, Electronics and Computing 2009-02-25T20:52:58Z 2009-02-25T20:52:58Z http://hanssummers.com/home/56-home.html Hans Summers hans.summers@gmail.com <h1><span style="color: #ff0000;">Radio, Electronics and Computing Projects<br />by Hans Summers</span></h1> <p>I make no claims for technical accuracy, good design, or necessarily even originality for the contents of these pages. Rather, I am a simple enthusiast attempting to convey my love and enjoyment of radio, electronics, and computing and perhaps to inspire YOU to build something too. The following pages document projects that I have built over a period of 30 years. Wherever applicable I have named sources and references. In each project I have attempted to provide as much information as time and resources allow, but no responsibility can be accepted for inaccuracies or omissions. Likewise, where some of the projects use mains or high voltages, no responsibility can be accepted for death or injury sustained if you attempt to replicate these projects. BE CAREFUL! If you have any comments or suggestions, <a href="http://hanssummers.com/contact.html">please email me</a>.</p> <h1>Recent Projects:</h1> <h1><span style="color: #ff0000;">Radio, Electronics and Computing Projects<br />by Hans Summers</span></h1> <p>I make no claims for technical accuracy, good design, or necessarily even originality for the contents of these pages. Rather, I am a simple enthusiast attempting to convey my love and enjoyment of radio, electronics, and computing and perhaps to inspire YOU to build something too. The following pages document projects that I have built over a period of 30 years. Wherever applicable I have named sources and references. In each project I have attempted to provide as much information as time and resources allow, but no responsibility can be accepted for inaccuracies or omissions. Likewise, where some of the projects use mains or high voltages, no responsibility can be accepted for death or injury sustained if you attempt to replicate these projects. BE CAREFUL! If you have any comments or suggestions, <a href="http://hanssummers.com/contact.html">please email me</a>.</p> <h1>Recent Projects:</h1> Simple GPS Freq. Ref. 2015-06-04T03:03:23Z 2015-06-04T03:03:23Z http://hanssummers.com/gpsref2.html Hans Summers hans.summers@gmail.com <table border="0"> <tbody> <tr> <td width="220"><a href="http://hanssummers.com/gpsref2"><img src="http://hanssummers.com/images/stories/gpsref2/0/1.jpg" border="0" alt="GpsRef2" width="200" height="150" /></a></td> <td>Here's a simple and easy single-chip 10.000000000MHz GPS-disciplined frequency reference, based on a small 14-pin AVR microcontroller ATtiny24. This implements a kind of software "Huff Puff" method stabilisation. It uses an old junkbox 10MHz OCXO. The final accuracy is about 0.5 parts per billion (ppb).</td> </tr> </tbody> </table> <table border="0"> <tbody> <tr> <td width="220"><a href="http://hanssummers.com/gpsref2"><img src="http://hanssummers.com/images/stories/gpsref2/0/1.jpg" border="0" alt="GpsRef2" width="200" height="150" /></a></td> <td>Here's a simple and easy single-chip 10.000000000MHz GPS-disciplined frequency reference, based on a small 14-pin AVR microcontroller ATtiny24. This implements a kind of software "Huff Puff" method stabilisation. It uses an old junkbox 10MHz OCXO. The final accuracy is about 0.5 parts per billion (ppb).</td> </tr> </tbody> </table> OCXO and synthesiser design 2014-09-01T10:30:49Z 2014-09-01T10:30:49Z http://hanssummers.com/ocxosynth.html Hans Summers hans.summers@gmail.com <table border="0"> <tbody> <tr> <td width="220"><a href="http://hanssummers.com/ocxosynth"><img src="http://hanssummers.com/images/stories/ocxosynth/1/in.jpg" border="0" alt="OCXO" width="200" height="150" style="border: 0px;" /></a></td> <td>This page documents the design and development of an OCXO and Synthesiser module. There were several motivations for developing this module, partly as a replacement for the popular AD9850 DDS module, available inexpensively on eBay and elsewhere.</td> </tr> </tbody> </table> <table border="0"> <tbody> <tr> <td width="220"><a href="http://hanssummers.com/ocxosynth"><img src="http://hanssummers.com/images/stories/ocxosynth/1/in.jpg" border="0" alt="OCXO" width="200" height="150" style="border: 0px;" /></a></td> <td>This page documents the design and development of an OCXO and Synthesiser module. There were several motivations for developing this module, partly as a replacement for the popular AD9850 DDS module, available inexpensively on eBay and elsewhere.</td> </tr> </tbody> </table> QRP Power meter 2015-01-21T05:09:01Z 2015-01-21T05:09:01Z http://hanssummers.com/powermeter.html Hans Summers hans.summers@gmail.com <table border="0"> <tbody> <tr> <td width="220"><a href="http://hanssummers.com/powermeter"><img src="http://hanssummers.com/images/stories/powermeter/meter.jpg" border="0" alt="Weaver" width="200" height="150" /></a></td> <td>It's really simple to make a QRP power meter measuring RF output powers from a few mW up to half a watt. This simple project described here is half an hour's work and all components are from the junk box. I used an old "VU" meter from an old piece of consumer equipment, probably a 70's Hi Fi or something similar, long-since forgotten.</td> </tr> </tbody> </table> <table border="0"> <tbody> <tr> <td width="220"><a href="http://hanssummers.com/powermeter"><img src="http://hanssummers.com/images/stories/powermeter/meter.jpg" border="0" alt="Weaver" width="200" height="150" /></a></td> <td>It's really simple to make a QRP power meter measuring RF output powers from a few mW up to half a watt. This simple project described here is half an hour's work and all components are from the junk box. I used an old "VU" meter from an old piece of consumer equipment, probably a 70's Hi Fi or something similar, long-since forgotten.</td> </tr> </tbody> </table> Stable valve VFO 2011-12-03T13:35:20Z 2011-12-03T13:35:20Z http://hanssummers.com/tubevfo.html Hans Summers hans.summers@gmail.com <table border="0"> <tbody> <tr> <td width="220"><a href="http://hanssummers.com/tubevfo"><img src="http://hanssummers.com/images/stories/tubevfo/boxeds.jpg" border="0" alt="VFO" width="200" height="150" style="border: 0px;" /></a></td> <td>This is the story of my quest to build an all-tube VFO for 26.0 to 26.5MHz, for use in a 21MHz SSB/CW superhet transceiver with 5.0688MHz intermediate frequency (IF). Construction efforts below were assisted by advice and commentary by G4OEP, K3IMW, K7HKL and VK6JY.</td> </tr> </tbody> </table> <table border="0"> <tbody> <tr> <td width="220"><a href="http://hanssummers.com/tubevfo"><img src="http://hanssummers.com/images/stories/tubevfo/boxeds.jpg" border="0" alt="VFO" width="200" height="150" style="border: 0px;" /></a></td> <td>This is the story of my quest to build an all-tube VFO for 26.0 to 26.5MHz, for use in a 21MHz SSB/CW superhet transceiver with 5.0688MHz intermediate frequency (IF). Construction efforts below were assisted by advice and commentary by G4OEP, K3IMW, K7HKL and VK6JY.</td> </tr> </tbody> </table> Weaver method SSB 2014-09-10T03:26:42Z 2014-09-10T03:26:42Z http://hanssummers.com/weaver.html Hans Summers hans.summers@gmail.com <table border="0"> <tbody> <tr> <td width="220"><a href="http://hanssummers.com/weaver"><img src="http://hanssummers.com/images/stories/weaver/photos/rx.jpg" border="0" alt="Weaver" width="200" height="121" /></a></td> <td>The Weaver method (also called 3rd method) of Single Sideband reception is a little-used technique in HF receivers (except perhaps in Software Defined Radios architectures). This article is an introduction, some practical experiments with a 10m Weaver method receiver, and a collection of information on the subject.</td> </tr> </tbody> </table> <table border="0"> <tbody> <tr> <td width="220"><a href="http://hanssummers.com/weaver"><img src="http://hanssummers.com/images/stories/weaver/photos/rx.jpg" border="0" alt="Weaver" width="200" height="121" /></a></td> <td>The Weaver method (also called 3rd method) of Single Sideband reception is a little-used technique in HF receivers (except perhaps in Software Defined Radios architectures). This article is an introduction, some practical experiments with a 10m Weaver method receiver, and a collection of information on the subject.</td> </tr> </tbody> </table> Ultimate3S kit 2015-06-01T03:49:08Z 2015-06-01T03:49:08Z http://hanssummers.com/u3kit.html Hans Summers hans.summers@gmail.com <table border="0"> <tbody> <tr> <td width="220"><a href="http://hanssummers.com/u3kit"><img src="http://hanssummers.com/images/stories/u3kit/u3.jpg" border="0" alt="U3S" width="200" height="150" style="border: 0px none;" /></a></td> <td>This is my implementation of the <a href="http://www.qrp-labs.com/ultimate3/u3s" target="_blank">QRP Labs Ultimate3S QRSS/WSPR kit</a>. My U3S is installed in the official <a href="http://www.qrp-labs.com/u3box" target="_blank">QRP Labs case</a>. I am using the<a href="http://www.qrp-labs.com/ultimatelpf" target="_blank"> relay-switched LPF kit</a> for 6-band operation, and <a href="http://www.qrp-labs.com/qlg1">QRP Labs QLG1 GPS receiver module</a>.</td> </tr> </tbody> </table> <table border="0"> <tbody> <tr> <td width="220"><a href="http://hanssummers.com/u3kit"><img src="http://hanssummers.com/images/stories/u3kit/u3.jpg" border="0" alt="U3S" width="200" height="150" style="border: 0px none;" /></a></td> <td>This is my implementation of the <a href="http://www.qrp-labs.com/ultimate3/u3s" target="_blank">QRP Labs Ultimate3S QRSS/WSPR kit</a>. My U3S is installed in the official <a href="http://www.qrp-labs.com/u3box" target="_blank">QRP Labs case</a>. I am using the<a href="http://www.qrp-labs.com/ultimatelpf" target="_blank"> relay-switched LPF kit</a> for 6-band operation, and <a href="http://www.qrp-labs.com/qlg1">QRP Labs QLG1 GPS receiver module</a>.</td> </tr> </tbody> </table>