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Roman";mso-ansi-language: EN-GB'>GM8BJF Homepage </span><span lang=EN-GB style='mso-fareast-font-family: "Times New Roman";mso-ansi-language:EN-GB'><o:p></o:p></span></h1> <p><span lang=EN-GB style='mso-ansi-language:EN-GB'>This page is a record of recent radio related projects I have undertaken that may be of interest or use to others - enjoy!<o:p></o:p></span></p> <p><span lang=EN-GB style='mso-ansi-language:EN-GB'>My main interest in amateur radio is in the VHF/UHF/Microwave parts of the spectrum. I none the less have odd sorties onto the HF bands just to see what they are like. Below are details of some projects I have undertaken recently <span class=GramE>( or</span> at least those that have got the length of being written up in some form or another! )<o:p></o:p></span></p> <p><b><span lang=EN-GB style='font-size:22.0pt;mso-bidi-font-size:12.0pt; mso-ansi-language:EN-GB'>GB3EDN 23cm Beacon Talk<o:p></o:p></span></b></p> <p><span lang=EN-GB style='mso-ansi-language:EN-GB'>I have been the <span class=SpellE>beaconkeeper</span> for the Edinburgh 23cm beacon on 1296.990 MHz since its inception in 1978. Recently I have <span class=SpellE>sarted</span> working on some more up to date hardware. Here are the <span class=SpellE><span class=GramE>powerpoint</span></span> slides I prepared for a talk I did about the beacon and its history<o:p></o:p></span></p> <p><span lang=EN-GB style='mso-ansi-language:EN-GB'><a href="GB3EDN.pdf">GB3EDN talk</a><o:p></o:p></span></p> <h1><span lang=EN-GB style='mso-fareast-font-family:"Times New Roman"; mso-ansi-language:EN-GB'>Test Equipment<o:p></o:p></span></h1> <p><span lang=EN-GB style='font-size:13.0pt;font-family:"Helvetica","sans-serif"; mso-ansi-language:EN-GB'>Spectrum Analyser Repair</span><span lang=EN-GB style='mso-ansi-language:EN-GB'><o:p></o:p></span></p> <p><span lang=EN-GB style='mso-ansi-language:EN-GB'>One of the most useful bits of test gear for RF and microwave work is a spectrum analyser. I have an HP141T/8552B/8555A analyser. A few years ago mine inexplicably lost sensitivity. I found that the mixer diode had died. I suppose that I must have done something to damage it but I was not aware of it. Having nothing to <span class=SpellE>loose</span> I dismantled it and attempted a repair. This was quite successful and I wrote it up as an article which appeared in the September 2002 UK Microwave Newsletter and others might find it useful if they have an ailing HP8555A plug-in. The article is available below:<o:p></o:p></span></p> <p><span lang=EN-GB style='mso-ansi-language:EN-GB'><a href="http://myweb.tiscali.co.uk/gm8bjf/text.html">Repair of the mixer in the HP8555A spectrum analyser plug-in</a><o:p></o:p></span></p> <p style='margin-top:11.9pt;page-break-after:avoid'><span lang=EN-GB style='font-size:13.0pt;font-family:"Helvetica","sans-serif";mso-ansi-language: EN-GB'>Time and Frequency Measurement</span><span lang=EN-GB style='mso-ansi-language: EN-GB'><o:p></o:p></span></p> <p><span lang=EN-GB style='mso-ansi-language:EN-GB'>In order that I can measure frequencies accurately at microwaves I maintain a GPS frequency standard. It is a Hewlett-<span class=SpellE>packard</span> Z3801A. These units were used in the North American cellular phone system to synchronise <span class=SpellE>cellsites</span>. <span class=SpellE>The</span> have become available on the secondary market in fairly large numbers and often appear on <span class=SpellE>Ebay</span> where I obtained my unit. The unit runs continuously and I monitor it with a PC. <a href="gpsstat.htm">Here is the status of my Z3801A</a>.<o:p></o:p></span></p> <p><span lang=EN-GB style='font-size:13.0pt;font-family:"Helvetica","sans-serif"; mso-ansi-language:EN-GB'>The N2PK Vector Network Analyser</span><span lang=EN-GB style='mso-ansi-language:EN-GB'><o:p></o:p></span></p> <p><span lang=EN-GB style='mso-ansi-language:EN-GB'>Recently I have been interested in the N2PK vector network analyser and have had one put together. This is a very useful piece of test equipment that has all the functionality of a professional instrument, covering the frequency range <span class=GramE>100KHz</span> to 60 <span class=SpellE>MHz.</span> This project was created and designed by Paul <span class=SpellE>Kiciak</span>, N2PK and is a very interesting and novel design. I recently gave a talk at the <span class=SpellE>Lothians</span> Radio Society (my local radio club.) <a href="http://myweb.tiscali.co.uk/gm8bjf/N2PK_talk.ppt">Here are the PowerPoint slides I prepared for this</a>.<o:p></o:p></span></p> <p><span lang=EN-GB style='mso-ansi-language:EN-GB'>The original design was controlled from the parallel pot of a PC. <a href="http://myweb.tiscali.co.uk/gm8bjf/vna_usb.html">Here is a description of how I powered it off the USB port</a> and made it communicate over the USB port using G8KBB's software.<o:p></o:p></span></p> <p><span lang=EN-GB style='mso-ansi-language:EN-GB'>&nbsp;<o:p></o:p></span></p> <h1><span lang=EN-GB style='mso-fareast-font-family:"Times New Roman"; mso-ansi-language:EN-GB'>Miscellaneous Radio Stuff<o:p></o:p></span></h1> <p><span lang=EN-GB style='mso-ansi-language:EN-GB'>One of my interests is in UHF/Microwave portable operation. One useful facility for this is to be able to connect to the internet when portable to arrange QSOs. <span class=SpellE><span class=GramE>Her</span></span> is how I did it. &nbsp;<a href="http://myweb.tiscali.co.uk/gm8bjf/GPRS.html">How to set up Pay-as-You-Go GPRS Internet access</a> for the ON4KST reflector when out portable. <o:p></o:p></span></p> <p class=MsoNormal><span lang=EN-GB style='mso-ansi-language:EN-GB'>In March 2012 I gave a talk at the <span class=SpellE>Lothians</span> radio Society titled  </span>Switch Mode Power supplies and How to <span class=GramE>Recycle</span> them . The subject matter was how to reuse ex-PC SMPS as useful bench power supplies and for powering other projects. Details are <a href="http://myweb.tiscali.co.uk/gm8bjf/SMPS_GM8BJF.pdf">here.</a><span lang=EN-GB style='mso-ansi-language:EN-GB'>&nbsp;</span></p> <p><span lang=EN-GB style='mso-ansi-language:EN-GB'>Some time ago I gave another talk at the <span class=SpellE>Lothians</span> Radio Society on the history and development of RF connectors. <a href="http://myweb.tiscali.co.uk/gm8bjf/rf_con.pdf">Here are the <span class=SpellE>viewfoils</span> I prepared for this.</a> This is one for real radio geeks! <o:p></o:p></span></p> <p><span lang=EN-GB style='mso-ansi-language:EN-GB'><a href="noise_figure.ppt">Here</a> are the foils for a talk I did on the measurement of noise figure using natural noise sources.<o:p></o:p></span></p> <p><span lang=EN-GB style='mso-ansi-language:EN-GB'>&nbsp;<o:p></o:p></span></p> <p><span lang=EN-GB style='mso-ansi-language:EN-GB'>April 2012.<o:p></o:p></span></p> <p class=MsoNormal><span lang=EN-GB style='mso-ansi-language:EN-GB'><o:p>&nbsp;</o:p></span></p> </div> </body> </html>