RX Antennas

<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="#FFFF00" TEXT="#080000"> <div> <A HREF="index.htm" TARGET="_top" TITLE="WE3C Home Page"><U><B>WE3C.com</B></U></A><B>                                                                               </B><FONT SIZE="1" COLOR="#111111" FACE="Arial" ><B>                                                                                                                                                                                 </B>  </FONT></div> <div> <A HREF="http://www.arrl.org/hamradio.html" TARGET="_top" TITLE="http://www.arrl.org/hamradio.html"><U>Learn about Amateur Radio</U></A>                                                                                                           <A HREF="id8.htm" TARGET="_top" TITLE="Contact Us"><U>Contact Us</U></A><B>  </B>                                                                                                                                    <A HREF="http://nist.time.gov/timezone.cgi?UTC/s/0/java" TARGET="_top" TITLE="http://nist.time.gov/timezone.cgi?UTC/s/"><U>UTC</U></A></div> <div> <A HREF="id3.htm" TARGET="_top" TITLE="Elmer"><U>Elmer</U></A>                                                                                                                                   <A HREF="http://www.weatherlink.com/user/we3c/index.php?view=summary&headers=0" TARGET="_top" TITLE="http://www.weatherlink.com/user/we3c/ind"><U> WE3C Weather Station</U></A>                                                                                                                          <A HREF="index.htm" TARGET="_top" TITLE="WE3C Home Page"><U>Home</U></A></div> <div> </div> </td> </tr><tr> <td valign="top" width=15.625% BGCOLOR="#FFCC66" TEXT="#080000"> <div> <B>Station</B></div> <div> <A HREF="id12.htm" TARGET="_top" TITLE="Station Design"><U>Design</U></A></div> <div> <A HREF="id13.htm" TARGET="_top" TITLE="160M"><U>160M</U></A></div> <div> <A HREF="id14.htm" TARGET="_top" TITLE="80M"><U>80M</U></A></div> <div> <A HREF="id17.htm" TARGET="_top" TITLE="40M"><U>40M</U></A></div> <div> <A HREF="id18.htm" TARGET="_top" TITLE="20M"><U>20M</U></A></div> <div> <A HREF="id19.htm" TARGET="_top" TITLE="15M"><U>15M</U></A></div> <div> <A HREF="id20.htm" TARGET="_top" TITLE="10M"><U>10M</U></A></div> <div> <A HREF="id22.htm" TARGET="_top" TITLE="RX Antennas"><U>RX Antennas</U></A></div> <bR> <div> <B>Resources</B></div> <div> <A HREF="http://www.dxengineering.com/" TARGET="_top" TITLE="http://www.dxengineering.com/"><U>DX Engineering</U></A></div> <div> <A HREF="http://www.iceradioproducts.com/" TARGET="_top" TITLE="http://www.iceradioproducts.com/"><U>ICE</U></A></div> </td> <td valign="top" height=390 BGCOLOR="#FFFF99" TEXT="#080000"> <bR> <div> <B>RX ANTENNAS</B></div> <bR> <div> <B>There are three types of receiving antennas in use.  Beverages for 160/80/40M, a Hygain TH7 for 20/15/10M and antennas that are not selected for TX on 160/80/40/20M.</B></div> <bR> <bR> <div> <B>RX SYSTEM</B></div> <bR> <div> <B>Each RX antenna has an individual feed line connecting the antenna to a DXE RPA-1 preamplifier in the shack. The output of each RPA-1 goes to an ICE 111-4A four way splitter then to a DXE relay box for each station to select the RX antenna.  Alternate TX antennas go to DXE-RSC-2 two port splitters then to the DXE relay box. Each radio's RX ANT input has an ICE 197 RF Limiter in the feed line connected to the DXE relay box. This set up allows a station to TX on one antenna and RX on any available antenna provided to it's RX ANT input by the RX relay selection (including any unused TX antenna if available).  No T/R switching is required other than the normal radio T/R.  S&P stations can listen on any available RX antenna including unused TX antennas where and when available.</B></div> <bR> <bR> <DIV ALIGN="LEFT"></DIV> <div> <B>BEVERAGES</B></div> <bR> <div> <B>The beverage antennas use DXE-BFS-1 Feed Systems and the provided resistor termination.  Termination ends use 4' ground rods with soldered resistor connections.  Feed points use two 8' ground rods connected per DXE recommendations.</B></div> <bR> <bR> <div> <B>NE 5 Degree 720' Pair, Staggered 60', Separated 20', Height 5' - The antenna is located 2000' east from TX antennas and 100' below TX antenna's base on the side of a slope.  This antenna allows us to RX through our same band TX signal very well with minimal hash.</B></div> <bR> <div> <B>NE 45 Degree ~1,400' Single, Height 8' - This is our best EU antenna which hears very well.  Same band TX signals block RX.</B></div> <bR> <div> <B>E 90 Degree 920' Pair, Staggered 60', Separated 20', Height 5' - This is a quiet antenna that picks up AF signals very well.  Same band TX signals block RX.</B></div> <bR> <div> <B>S 160 Degree 600' Single, Height 5' - This antenna is located 2000' east from TX antennas and 100' below TX antennas base on the side of a slope.  Same band TX signals interfere with RX depending on beaming directions.</B></div> <bR> <div> <B>W 220 Degree 1600' Single, Height 5' - This is our newest beverage and has proven to be excellent with copy of ZL and SW signals.  Same band TX signals block RX.</B></div> <bR> <div> <B>W 270 Degree 1000' Single, Height 5' - This is our noisiest beverage.  Same band TX signals block RX.</B></div> <bR> <div> <B>NW 320 Degree 750' Single, Height 5' - This is very quiet, good copy on JA, KL7 and NW signals.  Same band TX signals block RX.</B></div> <bR> <bR> <DIV ALIGN="LEFT"></DIV> <div> <B>HYGAIN TH7</B></div> <bR> <div> <B>A TH7 is mounted on a portable tower 2000' east from TX antennas, 30' above ground and 100' below the TX antennas base on the side of a slope.  The antenna is primarily used on 20M and has proven to be very effective at times.  Depending on the frequency and direction of TX antennas it blocks same band TX signals to the point that no degradation of RX is noticed.  With certain propagation conditions, it also effectively attenuates western US signals.</B></div> <bR> <bR> <DIV ALIGN="LEFT"></DIV> <div> <B>ALTERNATE TX ANTENNAS</B></div> <bR> <div> <B>Transmit antenna systems that are not selected by the transmitting station are fed back to the radio RX ANT input through the selectable RX antenna relay boxes.  This provides alternate RX antennas for the Run and S&P stations to use if needed.  The TX selection of an antenna system removes it from RX availability.  Same band TX signals most times interfere with RX depending on beaming directions.</B></div> <bR> <bR> </td> </tr></table></body>