Club Projects

<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="id3.htm" TARGET="_top" TITLE="Crystal Palace Radio Electronics Club"><U><B>Crystal Palace Radio & Electronics Club</B></U></A></div> <div> </div> </td> </tr><tr> <td valign="top" width=190 BGCOLOR="#FFCC66" TEXT="#080000" background="013d4c00dkelyh.png"> <div> <A HREF="id22.htm" TARGET="_top" TITLE="About Us"><U>About Us</U></A></div> <div> <B>Club Projects</B></div> <div> <A HREF="id14.htm" TARGET="_top" TITLE="Contact Us"><U>Contact Us</U></A></div> <div> <A HREF="id29.htm" TARGET="_top" TITLE="Notice Board For Sale and Wanted"><U>Notice Board - For Sale and Wanted</U></A></div> <div> <A HREF="id17.htm" TARGET="_top" TITLE="Meeting Details"><U>Meeting Details</U></A></div> <div> <A HREF="id56.htm" TARGET="_top" TITLE="Membership Application Form"><U>Membership Application Form</U></A></div> <div> <A HREF="id60.htm" TARGET="_top" TITLE="Newsletters"><U>Newsletters</U></A></div> <div> <A HREF="id55.htm" TARGET="_top" TITLE="Other Radio Clubs"><U>Other Radio Clubs</U></A></div> <div> <A HREF="id13.htm" TARGET="_top" TITLE="Program of Activities for 2009/10"><U>Program of Activities for 2009/10</U></A></div> <div> <A HREF="id18.htm" TARGET="_top" TITLE="Spring Sale"><U>Spring Sale</U></A></div> <bR> </td> <td valign="top" height=390 BGCOLOR="#FFFFFF" TEXT="#080000"> <div> <I>Club Projects</I></div> <div> There are now seven projects currently active:</div> <bR> <div> <B>a) 50MHz Converter</B></div> <bR> <div> The receiver converter design is complete and two boards have been made and tested with very similar results.</div> <bR> <div> <B>b) HF/VHF GDO</B></div> <bR> <div> The highest frequency achieved to date is 260MHz out of the case and the  lowest frequency about 500KHz. The reliable range seems to be 1 - 200MHz.</div> <bR> <div> A number of club members have now completed this project.</div> <bR> <div> The electronic design is complete and and the PCB artwork finished but not available via this website - contact Bob G3OOU for details. The circuit diagram is already posted in the Electronic Design Centre together with suggested construction details.</div> <bR> <div> <B>c) Strip Line VHF SWR Bridge</B></div> <bR> <div> This is primarily designed for 50-150MHz but the layout may be changed to suit other frequencies. A prototype has already been made and tested and the circuit diagram and 1:1 scale artwork are now complete and available.</div> <bR> <div> <B>d) Progressive Communications Receiver</B></div> <bR> <div> This is a simple direct conversion receiver based on the premise that it can be extended in the future to add more modes, bands and general functionality. There are four basic modules in the initial design - product detector, audio filter, audio amplifier and mains power supply. All of these may be made with basic tools, soldering iron etc. A battery may be used instead of the power supply if preferred. Further modules will be added in due course.</div> <bR> <div> Circuits and construction notes are available from the October 2002 newsletter or the club committee.</div> <bR> <div> <B>e) 50ohm Return Loss Bridge</B></div> <bR> <div> The circuit and construction notes are available from the Electronic Design Centre on this web site.</div> <bR> <div> <B>f) Low Cost Dummy Load</B></div> <bR> <div> The design is now in the Electronics Design Centre.</div> <bR> <div> <B>g) Low Cost Power Supply</B></div> <bR> <div> Victor has been taking our construction candidates through the process of building a low cost power supply.</div> <bR> <div> <B>h) 1 - 500MHz Log Detector</B></div> <bR> <div> A number of these have now been made and details are available from Bob G3OOU (see the 'Contact Us' section of this site). Dead bug construction is fine but it must be enclosed in a metal box. Stocks of the three ICs have now all been sold. </div> <bR> </td> </tr></table></body>