April 2010

<body topmargin=0 leftmargin=0 marginheight=0 marginwidth=0> <table cellpadding=0 cellspacing=0 border=0><tr> <td valign="top" colspan=2 height=90 BGCOLOR="#006699" TEXT="#080000" bgproperties="fixed" background="015285a1erlcgo.png"> <div> <FONT SIZE="5" COLOR="#FFCC66" FACE="Arial" ><B>Bob F Burns G3OOU</B></FONT><B>     |     </B><A HREF="index.htm" TARGET="_top" TITLE="Bob F Burns G3OOU"><U><B>home</B></U></A></div> <div> back to  <A HREF="id60.htm" TARGET="_top" TITLE="Newsletters"><U><B>Newsletters</B></U></A></div> <div> </div> </td> </tr><tr> <td valign="top" width=150 BGCOLOR="#FFCC66" TEXT="#080000" background="013d4c00dkelyh.png"> <div> <A HREF="id43.htm" TARGET="_top" TITLE="October 2009"><U>October 2009</U></A></div> <div> <A HREF="id70.htm" TARGET="_top" TITLE="November 2009"><U>November 2009</U></A></div> <div> <A HREF="id45.htm" TARGET="_top" TITLE="December 2009"><U>December 2009</U></A></div> <div> <A HREF="id50.htm" TARGET="_top" TITLE="January 2010 "><U>January 2010 </U></A></div> <div> <A HREF="id67.htm" TARGET="_top" TITLE="February 2010 "><U>February 2010 </U></A></div> <div> <A HREF="id27.htm" TARGET="_top" TITLE="March 2010"><U>March 2010</U></A></div> <div> <B>April 2010</B></div> <div> <A HREF="id23.htm" TARGET="_top" TITLE="May 2010"><U>May 2010</U></A></div> <div> <A HREF="id32.htm" TARGET="_top" TITLE="June 2010"><U>June 2010</U></A></div> <div> <A HREF="id24.htm" TARGET="_top" TITLE="July 2010"><U>July 2010</U></A></div> <div> <A HREF="id39.htm" TARGET="_top" TITLE="August 2010"><U>August 2010</U></A></div> <div> <A HREF="id40.htm" TARGET="_top" TITLE="September 2010"><U>September 2010</U></A></div> <bR> </td> <td valign="top" height=390 BGCOLOR="#FFFFFF" TEXT="#080000"> <div> <I>April 2010</I></div> <div> <B>IN THIS ISSUE</B></div> <div> <B>      Club News</B></div> <div> <B>      Last Meeting</B></div> <div> <B>      Future Meetings and Events</B></div> <div> <B>      Members Challenge</B></div> <div> <B>      Members News</B></div> <div> <B>      Technical Snippetts</B></div> <div> <B>      Noticeboard - Wanted & for Sale</B></div> <div> <B>      News From Other Clubs</B></div> <bR> <div> <B>Meeting and Event Diary:</B></div> <div> <TABLE BORDER="2" CELLPADDING="1" CELLSPACING="1" WIDTH="657" BORDERCOLORLIGHT="#C0C0C0" BORDERCOLORDARK="#808080" FRAME="BOX" RULES="ALL" HSPACE="0" VSPACE="0" > <tR> <tD VALIGN=TOP HEIGHT= 38 ><NOBR><div> 09 Apr 10</div> </NOBR></tD> <tD VALIGN=TOP WIDTH="17"><div> M</div> </tD> <tD VALIGN=TOP><NOBR><div> An evening of Short Talks</div> </NOBR></tD> <tD VALIGN=TOP WIDTH="64"><div> 25 Apr 10</div> </tD> <tD VALIGN=TOP WIDTH="17"><div> R</div> </tD> <tD VALIGN=TOP WIDTH="225"><div> Andover Radio Amateur Club Boot Sale</div> </tD> </tR> <tR> <tD VALIGN=TOP HEIGHT= 38 ><NOBR><div> 11 Apr 10</div> </NOBR></tD> <tD VALIGN=TOP WIDTH="17"><div> R</div> </tD> <tD VALIGN=TOP WIDTH="225"><div> Cambridgeshire Repeater Group Annual Rally</div> </tD> <tD VALIGN=TOP WIDTH="64"><div> 07 May 10</div> </tD> <tD VALIGN=TOP WIDTH="17"><div> M</div> </tD> <tD VALIGN=TOP WIDTH="225"><div> TBA</div> </tD> </tR> <tR> <tD VALIGN=TOP HEIGHT= 57 ><NOBR><div> 18 Apr 10</div> </NOBR></tD> <tD VALIGN=TOP WIDTH="17"><div> R</div> </tD> <tD VALIGN=TOP WIDTH="225"><div> West London Radio & Electronics Show</div> </tD> <tD VALIGN=TOP WIDTH="64"><div> 14-16 May 2010</div> </tD> <tD VALIGN=TOP WIDTH="17"><div> R</div> </tD> <tD VALIGN=TOP WIDTH="225"><div> Dayton Hamvention</div> </tD> </tR> </TABLE></div> <div> E = External event, M = club meeting, R = Rally</div> <DIV ALIGN="LEFT"></DIV> <div> <B>Please note that the next meeting has been moved from the first to the second Friday in April to avoid the Good Friday bank holiday and will now be held on 9</B><B>th</B><B> April.</B></div> <div> <B><U>Recent Event News</U></B></div> <div> <B><U>05 March 2010 - A History of Power Supplies part II</U></B></div> <div> Your scribe finally completed part two of this talk which had been delayed by poor weather and time constraints in previous meetings. Topics covered included:</div> <div> <IMG BORDER="0" SRC="Symb075c00b700f000000000.png" HEIGHT="16" WIDTH="24" ALIGN="bottom" HSPACE="0" VSPACE="0">A brief review of dry batteries</div> <div> <IMG BORDER="0" SRC="Symb075c00b700f000000000.png" HEIGHT="16" WIDTH="24" ALIGN="bottom" HSPACE="0" VSPACE="0">AC/DC radio receivers with both dropper resistors and resistive line cords</div> <div> <IMG BORDER="0" SRC="Symb075c00b700f000000000.png" HEIGHT="16" WIDTH="24" ALIGN="bottom" HSPACE="0" VSPACE="0">Linear and Switching power supplies</div> <div> <IMG BORDER="0" SRC="Symb075c00b700f000000000.png" HEIGHT="16" WIDTH="24" ALIGN="bottom" HSPACE="0" VSPACE="0">A detailed look at some of the problems faced by power supply designers</div> <div> <IMG BORDER="0" SRC="Symb075c00b700f000000000.png" HEIGHT="16" WIDTH="24" ALIGN="bottom" HSPACE="0" VSPACE="0">How to reform an electrolytic capacitor</div> <div> A short article about reforming electrolytic capacitors has been added to the technical website.</div> <div> Victor G1PKS talked about an amplifier he had removed from a portable gramophone player many years ago that had no mains transformer and used series connected high voltage filament valves and a direct connection to the AC mains.</div> <div> Don G3WDY showed us a modified power supply from a BCC69 mobile transceiver where the original synchronous vibrator had been replaced by two germanium power transistors and two rectifier diodes.</div> <div> Annual subscriptions for 2010 are now overdue. Please send your £9.00 subscription to our treasurer Robert or pay him at the next meeting.</div> <div> <B><U>Future Club Meetings and Events</U></B></div> <div> <B><U>09 April 2010 - An Evening of Short Talks</U></B></div> <div> The next meeting will be a collection of short talks including:</div> <div> An Introduction to Optics - Don Pike G3WDY</div> <div> The Air Traffic Management System - Alan O'Donovan G8NKM</div> <div> The Yaesu FT-450 - Bob Burns G3OOU</div> <div> <B><U>Members News</U></B></div> <div> Club member Giorgio in Italy send his best wishes to everyone.</div> <div> Victor G1PKS has had some problems following an eye operation and we wish him all the best for a speedy recovery.</div> <div> <B><U>Technical Snippets</U></B></div> <div> <B>1. My recent talk on power supplies</B> touched very briefly on two subjects but did not go into detail so I have expanded on the topics here.</div> <div> <B>a) The power factor</B> of an AC electric power system is defined as the ratio of the real power flowing to the load to the apparent power and is a dimensionless number between 0 and 1 - the object being to get as close to 1 as possible. Real power is the capacity of the circuit for performing work in a particular time. Apparent power is the product of the current and voltage of the circuit. Due to energy stored in the load and returned to the source, or due to a non-linear load that distorts the wave shape of the current drawn from the source, the apparent power can be greater than the real power.</div> <div> In an electric power system, a load with a low power factor draws more current than a load with a high power factor for the same amount of useful power transferred. The higher currents increase the energy lost in the distribution system, and require larger wires and other equipment. Because of the costs of larger equipment and wasted energy, electricity utilities will usually charge a higher cost to industrial or commercial customers where there is a low power factor.</div> <div> Modern power supply IC technology enables the PSU designer to make significant corrections to poor power factors.</div> <div> <B>b) The minimum breakdown voltage</B> of a rectifier diode in a capacitor input power supply is the sum of the peak AC voltage applied to the diode plus the maximum rectified DC voltage plus an amount that allows for tolerances in the mains voltage, mains transformer windings and component temperature de-rating. A good rule of thumb is to start with a figure of three times the maximum RMS AC voltage applied to the diode as shown in the following example.</div> <div> Where two or more diodes are used in series then the breakdown voltage of each diode may be reduced proportionately by the number of diodes. Small balancing resistors or capacitors may be required for series connected diodes depending on the particular type of diode.</div> <div> The following circuit shows a simple power supply with half wave rectification:</div> <div> <IMG SRC="36fbf8e0.png" border=0 width="447" height="142" ALIGN="BOTTOM" HSPACE="0" VSPACE="0"></div> <div> We will use an example where transformer T1 produces 15v RMS which is 21.21v peak at its secondary. On the positive half cycle, D1 conducts and C1 charges up to the peak voltage of 21.21v less the voltage drop across diode D1 (which may be taken to be 0.7V at low currents) i.e. 20.51v. On the negative half cycle, diode D1 cannot conduct and must cope with the total voltage appearing across it. This is the sum of the peak voltage of 21.21v applied to it from transformer T1 plus the maximum voltage across capacitor C1 of 20.51v which equals 41.72v or 2.78 times the applied RMS voltage. In addition we must allow for tolerances in the mains voltage, windings and internal resistances of transformer T1 and temperature derating. A 50v diode might just be suitable in the above example but is marginal.</div> <div> The maximum peak current of the chosen diode must allow for the normal working conditions of the circuit and the switch on surge when the smoothing capacitors first charge up to their working voltage. </div> <div> Diodes 1N4001-1N4007 have an RMS current rating of 1amp and a peak non-repetitive current rating over a single cycle of 30amps whereas the equivalent parameters for diodes 1N5401 - 1N5408 are 3amps and 200amps respectively. Always consult the data sheet when selecting a device for any design.</div> <div> <B>2. Ceramic - v - Plastic Packaging</B></div> <div> STMicroelectronics has announced innovative plastic air-cavity packages that enable high-power transistors for RF applications such as transceivers, broadcast equipment and MRI scanners to deliver performance and cost advantages over alternative devices in ceramic packages. Air-cavity packages provide high electrical isolation for silicon die and are well suited for high-frequency, high-power applications.</div> <div> Whereas the traditional package body is typically ceramic, to withstand high-temperature soldering during package assembly, this new air-cavity technology now enables lower thermal resistance, lower weight, and reduced cost compared to devices in ceramic packages. Two versions are available, matching the dimensions of industry-standard solder-down (flangeless) or bolt-down ceramic packages to enable direct replacement in existing designs. </div> <div> ST has introduced three new devices for applications up to 250MHz using this new package technology, including the only 100V VHF MOSFET currently on the market. The 100V STAC3932B/F, in bolt-down or flangeless configurations, has 26dB linear gain and can sustain pulse-power output up to 900W.</div> <div> The STAC2932B/F and STAC2942B/F are 50V devices having linear gain and continuous rated output power of 20dB/400W and 21dB/450W respectively. The devices achieve nominal efficiency from 68% to 75%, compared to around 55% for the nearest ceramic alternatives. Visit STMicroelectronics at <FONT SIZE="3" COLOR="#0000FF" FACE="Arial" ><A HREF="http://www.st.com/rf" TARGET="_top" TITLE="http://www.st.com/rf"><U><U>www.st.com/rf</U></U></A></FONT></div> <div> <B><U>Computer Corner</U></B></div> <div> The number of free software applications available to run under Ubuntu Linux shows no sign of slowing down. These include Computer Aided Design (CAD), Desk Top Publishing (DTP) and Ancestry (family tree) packages.</div> <div> You can install Linux on an existing PC as long as there is sufficient hard disk space and most Linux distributions include a partition manager that will create a separate partition to hold Linux and a boot manager to provide a boot menu.</div> <div> <B><U>Miscellaneous</U></B></div> <div> A number of QRP operators are reporting an improvement in HF propagation coinciding with a very slow increase in the number of visible sun spots. HF bands up to 15m are showing increased activity but 10m is still fairly quiet.</div> <div> <B>HF Contests:</B></div> <div> The HF bands will be extremely busy during the following contests if previous years are anything to go by:</div> <div> 27/28 Mar - CQ WPX Contest (SSB)</div> <div> 29/30 May - CQ WPX Contest (CW)</div> <div> If you are going to take part, even for an hour or two, please check the rules to make sure that you are familiar with the required exchanges. Full information available from <FONT SIZE="3" COLOR="#0000FF" FACE="Arial" ><A HREF="http://www.cqwpx.com/" TARGET="_top" TITLE="http://www.cqwpx.com/"><U><U>http://www.cqwpx.com/</U></U></A></FONT></div> <div> <B><U>Notice Board - Wanted and For Sale</U></B></div> <div> The Notice Board is for all club members to use so if you have one or more items that you wish to buy or sell then please send in the details. The current list of items may be viewed at: <FONT SIZE="3" COLOR="#0000FF" FACE="Arial" ><A HREF="http://www.g3oou.co.uk/" TARGET="_top" TITLE="http://www.g3oou.co.uk/"><U><U>http://www.g3oou.co.uk/</U></U></A></FONT> in the "Notice Board - Wanted and For Sale" section.</div> <div> Wanted:</div> <div> <B>SWL club member </B>looking for a VHF multimode receiver covering at least 144-146MHz. Contact Victor on 020 8653 2946 or Bob on 01737 552170.</div> <div> <B><U>For Sale:</U></B></div> <div> <B>Ken G3DJK </B>has a PCI Firewire Card 1349A, Maplin Code A49HH (new and unused). Best offer secures. Contact Ken on 020 8679 2717</div> <div> <B>Mode Components</B> has a website at <FONT SIZE="3" COLOR="#0000FF" FACE="Arial" ><A HREF="http://www.modecomponents.co.uk/" TARGET="_top" TITLE="http://www.modecomponents.co.uk/"><U><U>http://www.modecomponents.co.uk/</U></U></A></FONT> and can be contacted on 0121 554 5157 or 07984 071369.</div> <div> Email at <FONT SIZE="3" COLOR="#0000FF" FACE="Arial" ><A HREF="mailto:sales@modecomponents.co.uk" TARGET="_top" TITLE="mailto:sales@modecomponents.co.uk"><U><U>sales@modecomponents.co.uk</U></U></A></FONT> or</div> <div> <A HREF="mailto:modecomponents@yahoo.com" TARGET="_top" TITLE="mailto:modecomponents@yahoo.com"><U><U>modecomponents@yahoo.com</U></U></A></div> <div> <B>Sycom</B> run by Robin G3NFV supplies a range of electronic components & new/second hand equipment. The web site can be found at: <FONT SIZE="3" COLOR="#0000FF" FACE="Arial" ><A HREF="http://www.sycomcomp.co.uk/" TARGET="_top" TITLE="http://www.sycomcomp.co.uk/"><U><U>http://www.sycomcomp.co.uk/</U></U></A></FONT></div> <div> <B>JAB Electronic Components, </B>PO Box 5774, Birmingham, B44 8PJ supply a wide range of electronic components and can be contacted on 0121-682-7045 or by email at: <FONT SIZE="3" COLOR="#0000FF" FACE="Arial" ><A HREF="mailto:jabdog@blueyonder.co.uk" TARGET="_top" TITLE="mailto:jabdog@blueyonder.co.uk"><U><U>jabdog@blueyonder.co.uk</U></U></A></FONT></div> <div> 73</div> <div> <IMG SRC="36e35330.jpg" border=0 width="53" height="51" ALIGN="BOTTOM" HSPACE="0" VSPACE="0">G3OOU</div> <div> <TABLE BORDER="2" CELLPADDING="1" CELLSPACING="1" WIDTH="604" BORDERCOLORLIGHT="#C0C0C0" BORDERCOLORDARK="#808080" FRAME="BOX" RULES="ALL" HSPACE="0" VSPACE="0" > <tR> <tD VALIGN=TOP HEIGHT= 19 WIDTH="594"><div> Diary of External Events</div> </tD> </tR> <tR> <tD VALIGN=TOP HEIGHT= 20 ><NOBR><div> <B>11 April - Cambridgeshire Repeater Group Annual Rally</B></div> </NOBR></tD> </tR> <tR> <tD VALIGN=TOP HEIGHT= 57 WIDTH="594"><div> Foxton Village Hall, Hardman Road, Foxton, Cambridge CB22 6RN. Talk In S22, Opens 10.00, £2. Contact Laurence, M0LCM, 01223 654880, e-mail <FONT SIZE="3" COLOR="#0000FF" FACE="Arial" ><A HREF="mailto:rally2010@ambridgerepeaters.net" TARGET="_top" TITLE="mailto:rally2010@ambridgerepeaters.net"><U><U>rally2010@ambridgerepeaters.net</U></U></A></FONT></div> </tD> </tR> <tR> <tD VALIGN=TOP HEIGHT= 20 WIDTH="594"><div> <B>18 Apr - West London Radio & Electronics Show</B></div> </tD> </tR> <tR> <tD VALIGN=TOP HEIGHT= 57 WIDTH="594"><div> Kempton Park Racecourse, Staines Road East, Sunbury on Thames, Middlesex TW16 5AQ. Talk in. Opens 9.50/10.00, Lecture stream. Details from Paul, M0CJX, 0845 165 0351, <FONT SIZE="3" COLOR="#0000FF" FACE="Arial" ><A HREF="mailto:info@radiofairs.co.uk" TARGET="_top" TITLE="mailto:info@radiofairs.co.uk"><U><U>info@radiofairs.co.uk</U></U></A></FONT> or visit the website at: <FONT SIZE="3" COLOR="#0000FF" FACE="Arial" ><A HREF="http://www.radiofairs.co.uk" TARGET="_top" TITLE="http://www.radiofairs.co.uk"><U><U>www.radiofairs.co.uk</U></U></A></FONT></div> </tD> </tR> <tR> <tD VALIGN=TOP HEIGHT= 20 WIDTH="594"><div> <B>25 Apr - Andover Radio Amateur Club Boot Sale </B></div> </tD> </tR> <tR> <tD VALIGN=TOP HEIGHT= 57 WIDTH="594"><div> Wildhern Village Hall and Playing Field, SP11 0JE, north of Andover just off the A343. TI S22, CP, £1.50, C, DF. Vendors £6 per boot/table, £8 inside the hall. Details Martin, M0MWS, 01980 612070. Website: <FONT SIZE="3" COLOR="#0000FF" FACE="Arial" ><A HREF="http://www.arac.org.uk" TARGET="_top" TITLE="http://www.arac.org.uk"><U><U>www.arac.org.uk</U></U></A></FONT></div> </tD> </tR> <tR> <tD VALIGN=TOP HEIGHT= 20 WIDTH="594"><div> <B>14-16 May - Dayton Hamvention</B></div> </tD> </tR> <tR> <tD VALIGN=TOP HEIGHT= 57 WIDTH="594"><div> Forums, exhibition space and a huge flea 2,500 space market, talk-in, live video and sound broadcasting over the Internet. More information from <FONT SIZE="3" COLOR="#0000FF" FACE="Arial" ><A HREF="http://www.hamvention.org/index.php" TARGET="_top" TITLE="http://www.hamvention.org/index.php"><U><U>http://www.hamvention.org/index.php</U></U></A></FONT></div> </tD> </tR> <tR> <tD VALIGN=TOP HEIGHT= 20 ><NOBR><div> <B>23 May - Dunstable Downs RC - National Amateur Radio Car Boot Sale</B></div> </NOBR></tD> </tR> <tR> <tD VALIGN=TOP HEIGHT= 57 WIDTH="594"><div> Stockwood Park, Luton (M1 J10 then follow yellow DDRC signs), or satnav LU1 5NR. Opens 9.00. Talk In S22. Entry £2.</div> <div> Website: <FONT SIZE="3" COLOR="#0000FF" FACE="Arial" ><A HREF="http://www.ddrcbootsale.org" TARGET="_top" TITLE="http://www.ddrcbootsale.org"><U><U>www.ddrcbootsale.org</U></U></A></FONT></div> </tD> </tR> <tR> <tD VALIGN=TOP HEIGHT= 20 ><NOBR><div> <B>6 Jun - Newhaven Fort Amateur Radio Group Rally and Fort Open Day </B></div> </NOBR></tD> </tR> <tR> <tD VALIGN=TOP HEIGHT= 57 WIDTH="594"><div> Newhaven Fort, East Sussex. CP, £2, OT 10.30, CBS, DF, FAM, CS, SIG, C. Sellers tables £7 each, set up 9am. Eddie, G0ECW on 01273 300772, e-mail <FONT SIZE="3" COLOR="#0000FF" FACE="Arial" ><A HREF="mailto:eddie@zamboodle.demon.co.uk" TARGET="_top" TITLE="mailto:eddie@zamboodle.demon.co.uk"><U><U>eddie@zamboodle.demon.co.uk</U></U></A></FONT>.</div> </tD> </tR> <tR> <tD VALIGN=TOP HEIGHT= 20 ><NOBR><div> <B>13 Jun - East Suffolk Wireless Revival (Ipswich Radio Rally)</B></div> </NOBR></tD> </tR> <tR> <tD VALIGN=TOP HEIGHT= 76 WIDTH="594"><div> The Orwell Crossing Lorry Park, A14 Eastbound, Nacton, Ipswich, IP10 0DD. RSGB Bookstall, GB4SWR HF station, Talk In S22. Opens 9.30, entry £1. Contact John, G3XDY on 07710 044858 or Steve, M1ACB on 07711 329624</div> <div> Website: <FONT SIZE="3" COLOR="#0000FF" FACE="Arial" ><A HREF="http://www.eswr.org.uk" TARGET="_top" TITLE="http://www.eswr.org.uk"><U><U>www.eswr.org.uk</U></U></A></FONT></div> </tD> </tR> <tR> <tD VALIGN=TOP HEIGHT= 20 WIDTH="594"><div> <B>20 Jun - Newbury Radio Rally and Boot Sale - </B></div> </tD> </tR> <tR> <tD VALIGN=TOP HEIGHT= 95 WIDTH="594"><div> Newbury Showground, next to M4 J13. Big display area of amateur radio stations, exhibitions, special groups, clubs and societies. Talk In S22, opens 9.00, entry £2, Sellers have access from 8am and pitches cost £10. Details from <FONT SIZE="3" COLOR="#0000FF" FACE="Arial" ><A HREF="http://www.rallynadars.org.uk" TARGET="_top" TITLE="http://www.rallynadars.org.uk"><U><U>www.rallynadars.org.uk</U></U></A></FONT></div> <div> Website: <FONT SIZE="3" COLOR="#0000FF" FACE="Arial" ><A HREF="http://www.nadars.org.uk" TARGET="_top" TITLE="http://www.nadars.org.uk"><U><U>www.nadars.org.uk</U></U></A></FONT></div> </tD> </tR> <tR> <tD VALIGN=TOP HEIGHT= 20 WIDTH="594"><div> <B>25 - 27 JUN - Hamtronic Show, Friedrichshafen - </B></div> </tD> </tR> <tR> <tD VALIGN=TOP HEIGHT= 38 ><NOBR><div> Messe, Friedrichshafen, Germany. Large RSGB bookstall. Website:</div> <div> <A HREF="http://www.hamradio-friedrichshafen.de/html/en" TARGET="_top" TITLE="http://www.hamradio-friedrichshafen.de/h"><U><U>www.hamradio-friedrichshafen.de/html/en</U></U></A></div> </NOBR></tD> </tR> <tR> <tD VALIGN=TOP HEIGHT= 20 WIDTH="594"><div> <B>8-10 Oct - RSGB Convention</B></div> </tD> </tR> <tR> <tD VALIGN=TOP HEIGHT= 19 WIDTH="594"><div> Horwood House, near Milton Keynes</div> </tD> </tR> <tR> <tD VALIGN=TOP HEIGHT= 39 WIDTH="594"><div> <B>A full list of rallies and events may be found at </B><FONT SIZE="3" COLOR="#0000FF" FACE="Arial" ><A HREF="http://www.rsgb.org/events/index.php" TARGET="_top" TITLE="http://www.rsgb.org/events/index.php"><U><B><U>http://www.rsgb.org/events/index.php</U></B></U></A></FONT></div> </tD> </tR> </TABLE></div> <div> <B>News from other Clubs</B></div> <div> <B>Club Secretaries</B> - please send your meeting programs to Bob G3OOU. Our newsletter is now published during the third week of each month and closes for editorial input at the end of the second week. Due to differing publication dates and short lead times it is sometimes difficult to include other clubs' specific events although we will endeavour to do so if advised in time.</div> <div> <B>Chelmsford Amateur Rado Society (CARS)</B></div> <div> Secretary Martyn Medcalf G1EFL Tel: 01245-469008. First Tuesday of each month at MASC, Beehive Lane, Great Baddow, Chelmsford, CM2 9RX. Essex. UK. Web: <FONT SIZE="3" COLOR="#0000FF" FACE="Arial" ><A HREF="http://www.g0mwt.org.uk" TARGET="_top" TITLE="http://www.g0mwt.org.uk"><U><U>www.g0mwt.org.uk</U></U></A></FONT></div> <div> <TABLE BORDER="0" CELLPADDING="1" CELLSPACING="1" WIDTH="306" BORDERCOLORLIGHT="#C0C0C0" BORDERCOLORDARK="#808080" FRAME="VOID" RULES="NONE" HSPACE="0" VSPACE="0" > <tR> <tD VALIGN=TOP HEIGHT= 57 ><NOBR><div> 06 Apr</div> </NOBR></tD> <tD VALIGN=TOP WIDTH="241"><div> World War II Wireless Intercept and Secret Stations" - Stan Ames G4OAV</div> </tD> </tR> <tR> <tD VALIGN=TOP HEIGHT= 57 ><NOBR><div> 04 May</div> </NOBR></tD> <tD VALIGN=TOP WIDTH="241"><div> "Breathing new life into T1154, R1155 and a CR150" - Peter Bridgeman, G3SUY.</div> </tD> </tR> </TABLE></div> <div> <B>Coulsdon (CATS) </B>2nd Monday every month, 8pm at St Swithun's Church Hall, Grovelands Road, Purley. Contact: Andy Jackson G8JAC, 020 8651 2727, <FONT SIZE="3" COLOR="#0000FF" FACE="Arial" ><A HREF="mailto:G8JAC@champ1,freeserve.co.uk" TARGET="_top" TITLE="mailto:G8JAC@champ1,freeserve.co.uk"><U><U>G8JAC@btinternet.com</U></U></A></FONT></div> <div> <TABLE BORDER="0" CELLPADDING="1" CELLSPACING="1" WIDTH="306" BORDERCOLORLIGHT="#C0C0C0" BORDERCOLORDARK="#808080" FRAME="VOID" RULES="NONE" HSPACE="0" VSPACE="0" > <tR> <tD VALIGN=TOP HEIGHT= 38 ><NOBR><div> 12 Apr</div> </NOBR></tD> <tD VALIGN=TOP WIDTH="241"><div> Lecture on microwaves (to be confirmed)</div> </tD> </tR> </TABLE></div> <div> <B>Echelford Amateur Radio Society</B></div> <div> <A HREF="mailto:patrick@yarg.demon.co.uk" TARGET="_top" TITLE="mailto:patrick@yarg.demon.co.uk"><U>Secretary Tony Collier 2E1IDK, 01932 564099 email: </U></A><FONT SIZE="3" COLOR="#0000FF" FACE="Arial" ><A HREF="mailto:anthony991collier@btinternet.com" TARGET="_top" TITLE="mailto:anthony991collier@btinternet.com"><U><U>anthony991collier@btinternet.com</U></U></A></FONT></div> <div> <A HREF="mailto:anthony991collier@btinternet.com" TARGET="_top" TITLE="mailto:anthony991collier@btinternet.com"><U>Web site: http://homepage.ntlworld.com/stuart.m0sar/</U></A></div> <div> Meets on 2nd and 4th Thursday of each month.</div> <div> Phone for details.</div> <div> <B>Mitcham & District Amateur Radio Society</B></div> <div> Secretary: Mike Knott G0WCR, 76 New Barnes Avenue, Mitcham, Surrey, CR4 1LF.</div> <div> Tel: 020 8764 4716</div> <div> Phone for details</div> <div> <B>Reigate Amateur Transmitting Society</B></div> <div> Secretary: Tim Trew G8JXV</div> <div> <FONT SIZE="3" COLOR="#000000" FACE="Arial" >Tel: 01293 775278. Email: </FONT><A HREF="mailto:rats@qsl.net" TARGET="_top" TITLE="mailto:rats@qsl.net"><U><U>tim.trew@btinternet.com</U></U></A><A HREF="mailto:rats@qsl.net" TARGET="_top" TITLE="mailto:rats@qsl.net"><U> </U></A></div> <div> Meeting on 3rd Thursday of each month, 7:30pm at RNIB Redhill College, Philanthrophic Road, Redhill</div> <div> <B>Surrey Radio Contact Club (SRCC)</B> 1st and 3rd Monday every month, 8pm at Trinity School, South Croydon. Contact: Ray Howells G4FFY on 020 8644 7589 or <FONT SIZE="3" COLOR="#0000FF" FACE="Arial" ><A HREF="mailto:secretary@g3src.org.uk" TARGET="_top" TITLE="mailto:secretary@g3src.org.uk"><U><U>secretary@g3src.org.uk</U></U></A> </FONT>for more details.</div> <div> <TABLE BORDER="0" CELLPADDING="1" CELLSPACING="1" WIDTH="306" BORDERCOLORLIGHT="#C0C0C0" BORDERCOLORDARK="#808080" FRAME="VOID" RULES="NONE" HSPACE="0" VSPACE="0" > <tR> <tD VALIGN=TOP HEIGHT= 19 ><NOBR><div> 12 Apr </div> </NOBR></tD> <tD VALIGN=TOP WIDTH="241"><div> AGM</div> </tD> </tR> <tR> <tD VALIGN=TOP HEIGHT= 38 ><NOBR><div> 10 May</div> </NOBR></tD> <tD VALIGN=TOP WIDTH="241"><div> Project Constructing Project Evening</div> </tD> </tR> <tR> <tD VALIGN=TOP HEIGHT= 19 WIDTH="58"><div> 07 Jun</div> </tD> <tD VALIGN=TOP WIDTH="241"><div> Construction Contest</div> </tD> </tR> </TABLE></div> <div> <B>Sutton & Cheam RS.</B> 3rd Thursday every month, 8pm at Sutton United FC, The Borough Sports Ground, Gander Green Lane, Sutton. Contact John Puttock G0BWV on 020 8644 9945</div> <div> <TABLE BORDER="0" CELLPADDING="1" CELLSPACING="1" WIDTH="306" BORDERCOLORLIGHT="#C0C0C0" BORDERCOLORDARK="#808080" FRAME="VOID" RULES="NONE" HSPACE="0" VSPACE="0" > <tR> <tD VALIGN=TOP HEIGHT= 57 ><NOBR><div> 15 Apr</div> </NOBR></tD> <tD VALIGN=TOP WIDTH="241"><div> `Kite & Balloon Supported Antennas' by Roger Stafford - G4ROJ</div> </tD> </tR> <tR> <tD VALIGN=TOP HEIGHT= 19 ><NOBR><div> 20 May</div> </NOBR></tD> <tD VALIGN=TOP WIDTH="241"><div> Annual General Meeting</div> </tD> </tR> <tR> <tD VALIGN=TOP HEIGHT= 19 WIDTH="58"><div> 17 Jun</div> </tD> <tD VALIGN=TOP WIDTH="241"><div> To be confirmed</div> </tD> </tR> </TABLE></div> <div> <B>Wimbledon. </B>2nd and last Friday every month, 8pm at Martin Way Methodist Church, Buckleigh Avenue, Merton Park, SW19 9JZ</div> <div> Contact Jim Bell, M0CON on 020 8874 7456</div> <div> <TABLE BORDER="0" CELLPADDING="1" CELLSPACING="1" WIDTH="306" BORDERCOLORLIGHT="#C0C0C0" BORDERCOLORDARK="#808080" FRAME="VOID" RULES="NONE" HSPACE="0" VSPACE="0" > <tR> <tD VALIGN=TOP HEIGHT= 19 ><NOBR><div> 09 Apr</div> </NOBR></tD> <tD VALIGN=TOP WIDTH="241"><div> Surplus Equipment Sale</div> </tD> </tR> <tR> <tD VALIGN=TOP HEIGHT= 19 ><NOBR><div> 14 May</div> </NOBR></tD> <tD VALIGN=TOP WIDTH="241"><div> Direction Finding Hunt</div> </tD> </tR> <tR> <tD VALIGN=TOP HEIGHT= 19 ><NOBR><div> 28 May</div> </NOBR></tD> <tD VALIGN=TOP WIDTH="241"><div> Vintage Rig Evening</div> </tD> </tR> <tR> <tD VALIGN=TOP HEIGHT= 57 WIDTH="58"><div> 11 Jun</div> </tD> <tD VALIGN=TOP WIDTH="241"><div> Current Issues in the Amateur Radio World <I>by Alison Johnston (G8ROG)</I></div> </tD> </tR> </TABLE></div> <bR> </td> </tr></table></body>